Why does the app crashes when second activity is launched?

Why does the app crashes when second activity is launched? - android

I am new to android programming.
I made an app having 2 activities(one being the launcher other being seek). the second activity is started by a button in the main activity.
while i do this the app crashes.
The Mainfest.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.a1.starklabs.myapplication">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Seek">
<intent-filter>
<action android:name="com.a1.starklabs.myapplication.Seek" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
**Main_activity.xml**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.a1.starklabs.myapplication.MainActivity">
<ImageView
android:layout_height="100dp"
app:srcCompat="#mipmap/game"
android:id="#+id/imageView3"
android:scaleType="centerCrop"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true"
android:layout_width="100dp" />
<Button
android:text="Image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
style="#android:style/Widget.Button"
android:elevation="24dp"
android:textAppearance="#style/TextAppearance.AppCompat.Body2"
android:layout_marginTop="27dp"
android:layout_below="#+id/imageView3"
android:layout_centerHorizontal="true" />
<TextView
android:text="Other Activities:"
android:layout_width="150dp"
android:layout_height="20dp"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="18dp"
android:layout_marginStart="18dp"
android:id="#+id/textView"
android:elevation="5dp"
android:fontFamily="cursive"
android:textColorLink="?attr/actionMenuTextColor"
android:textColor="#android:color/holo_green_dark" />
<Button
android:text="SEEK"
android:layout_below="#+id/textView"
android:layout_alignLeft="#+id/textView"
android:layout_alignStart="#+id/textView"
android:layout_marginTop="12dp"
android:id="#+id/button2"
android:layout_height="33dp"
android:layout_width="60dp" />
</RelativeLayout>
Main_activity.java
package com.a1.starklabs.myapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
public static ImageView i1;
public static Button b1;
private int img_index;
int[] images={R.mipmap.game,R.mipmap.mustang};
private static Button b_seek;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonClick();
seek_button();
}
public void seek_button()
{
b_seek=(Button)findViewById(R.id.button2);
b_seek.setOnClickListener(
new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent i=new Intent("com.a1.starklabs.myapplication.Seek");
startActivity(i);
}
}
);
}
public void buttonClick()
{
i1=(ImageView)findViewById(R.id.imageView3);
b1=(Button)findViewById(R.id.button);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
img_index++;
img_index=img_index%images.length;
i1.setImageResource(images[img_index]);
}
});
}
}
activity_seek.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_seek"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.a1.starklabs.myapplication.Seek">
<SeekBar
android:layout_marginTop="86dp"
android:id="#+id/seekBar"
android:layout_height="50dp"
android:layout_width="300dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:text="TextView"
android:layout_width="100dp"
android:layout_below="#+id/seekBar"
android:layout_centerHorizontal="true"
android:layout_marginTop="48dp"
android:id="#+id/textView2"
android:textSize="20dp"
android:layout_height="30dp"
android:textAppearance="#style/TextAppearance.AppCompat"
style="#android:style/Widget.Material.TextView" />
</RelativeLayout>
seek.java
package com.a1.starklabs.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
public class Seek extends AppCompatActivity {
private static SeekBar s1;
private static TextView t1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_seek);
seekbar();
}
public void seekbar(){
s1=(SeekBar)findViewById(R.id.seekBar);
t1=(TextView)findViewById(R.id.textView2);
t1.setText(s1.getProgress());
s1.setOnSeekBarChangeListener(
new SeekBar.OnSeekBarChangeListener() {
int prog_ress;
#Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
prog_ress=i;
t1.setText(s1.getProgress());
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
t1.setText(s1.getProgress());
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
t1.setText(s1.getProgress());
}
}
);
}
}
error log
$ adb shell am start -n "com.a1.starklabs.myapplication/com.a1.starklabs.myapplication.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Connected to process 2913 on device emulator-5554
W/System: ClassLoader referenced unknown path: /data/app/com.a1.starklabs.myapplication-2/lib/x86
I/InstantRun: Instant Run Runtime started. Android package is com.a1.starklabs.myapplication, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.a1.starklabs.myapplication-2/lib/x86
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
W/ResourceType: No package identifier when getting value for resource number 0x00000000
D/AndroidRuntime: Shutting down VM
--------- beginning of crash
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.a1.starklabs.myapplication, PID: 2913
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.a1.starklabs.myapplication/com.a1.starklabs.myapplication.Seek}: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.content.res.Resources.getText(Resources.java:335)
at android.widget.TextView.setText(TextView.java:4555)
at com.a1.starklabs.myapplication.Seek.seekbar(Seek.java:36)
at com.a1.starklabs.myapplication.Seek.onCreate(Seek.java:27)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
Application terminated.

t1.setText(s1.getProgress()); is probably the cause of your problems.
I guess you want to set the current progress as text, but it calls TextView.setText(int) which tries to load a string resource with the id equal to the given progress. Since this is 0 at the start it tries to load resource 0, which does not exist.
To fix it, explicitly turn the progress into a string: t1.setText(Integer.toString(s1.getProgress()));.

Try this:
Intent i=new Intent(MainActivity.this, Seek.class);
startActivity(i);
Hope it helps!!

Related

InflateException at spefic case, what am I missing?

I'm receiving an InflateException from ChatActivity when it is not the LAUNCHER activity but when I change the manifest such that ChatActivity is the LAUNCHER, the app work properly.
I'm probably missing something, is there something missing in the code?
Update 18:15 16.10 -
I've found that if I delete
implements View.OnClickListener
from LoginActivity the app working (but now I don't have buttons).
What is the cause of this problem and how can it be fixed?
Part of the MANIFEST when the error accrue -
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".Activities.LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activities.ChatMainActivity"></activity>
<activity android:name=".Activities.RegisterActivity" />
And if I'm changing the file to this (below) the chat work properly -
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".Activities.LoginActivity"></activity>
<activity android:name=".Activities.ChatMainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activities.RegisterActivity" />
The dependencies -
implementation 'androidx.appcompat:appcompat:1.0.0'
implementation 'com.google.android.material:material:1.0.0'
XML file of ChatActivity -
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activities.ChatMainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/appBarLayout">
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/main_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
</androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout
android:id="#+id/main_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"></com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/main_tabPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/appBarLayout">
</androidx.viewpager.widget.ViewPager>
</RelativeLayout>
The activity -
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import androidx.appcompat.widget.Toolbar;
import com.google.android.material.tabs.TabLayout;
import com.nirkov.hive.Fragments.ChatFragment;
import com.nirkov.hive.Fragments.ChatOffersFragment;
import com.nirkov.hive.Fragments.ChatRequestsFragment;
import com.nirkov.hive.R;
public class ChatMainActivity extends AppCompatActivity {
private ViewPager mViewPager;
private SectionsPagerAdapter mSectionsPagerAdapter;
private TabLayout mTabLayout;
private Toolbar mToolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat_main);
mToolbar = (Toolbar) findViewById(R.id.main_app_bar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("Chat");
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.main_tabPager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mTabLayout = (TabLayout) findViewById(R.id.main_tabs);
mTabLayout.setupWithViewPager(mViewPager);
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
super.onOptionsItemSelected(item);
return true;
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.chat_bar_layout, menu);
return true;
}
#Override
public void onStart() {
super.onStart();
}
private class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(#NonNull FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Fragment getItem(final int position) {
switch (position){
case 0:
return new ChatRequestsFragment();
case 1:
return new ChatFragment();
case 2:
return new ChatOffersFragment();
}
return null;
}
#Override
public int getCount() {
return 3;
}
public CharSequence getPageTitle(final int position){
switch(position){
case 0:
return "REQUESTS";
case 1:
return "CHATS";
case 2:
return "OFFERS";
}
return null;
}
}
}
The appTheme style -
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
The LoginActivity -
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.nirkov.hive.R;
public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
private static final String TAG = "LoginActivity";
private Button loginButton;
private EditText emailBox, passwordBox;
private TextView registerHereLink;
private FirebaseAuth mAuth;
ProgressBar progressBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
loginButton = (Button) findViewById(R.id.loginButton);
emailBox = (EditText)findViewById(R.id.emailBox);
passwordBox = (EditText)findViewById(R.id.passwordBox);
registerHereLink = (TextView)findViewById(R.id.registerHereLink);
progressBar = (ProgressBar) findViewById(R.id.loginProgressBar);
mAuth = FirebaseAuth.getInstance();
loginButton.setOnClickListener(this);
registerHereLink.setOnClickListener(this);
}
#Override
public void onStart() {
super.onStart();
if(mAuth.getCurrentUser() != null){
startActivity(new Intent(this, ChatMainActivity.class));
}
}
#Override
public void onClick(View view) {
switch(view.getId()){
case R.id.loginButton:
String email = emailBox.getText().toString();
String password = passwordBox.getText().toString();
loginButton.setVisibility(View.GONE);
progressBar.setVisibility(View.VISIBLE);
signIn(email, password);
break;
case R.id.registerHereLink:
startActivity(new Intent(LoginActivity.this, RegisterActivity.class));
break;
}
}
private void signIn(String email, final String password){
mAuth.signInWithEmailAndPassword(email, password).
addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
Log.d(TAG, "signIn : success");
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}else{
Log.w(TAG, "signIn:failure", task.getException());
Toast.makeText(LoginActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
progressBar.setVisibility(View.GONE);
loginButton.setVisibility(View.VISIBLE);
}
});
}
}
The Login XML file -
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activities.LoginActivity">
<TextView
android:id="#+id/email"
android:layout_width="255dp"
android:layout_height="34dp"
android:layout_marginStart="20dp"
android:layout_marginTop="32dp"
android:text="Email:"
android:textSize="24sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="#+id/emailBox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text=""
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/email" />
<!--Password : text view and text box-->
<TextView
android:id="#+id/password"
android:layout_width="133dp"
android:layout_height="31dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text="Password:"
android:textSize="24sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/emailBox" />
<EditText
android:id="#+id/passwordBox"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:ems="10"
android:inputType="textPersonName"
android:text=""
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/password" />
<Button
android:id="#+id/loginButton"
android:layout_width="115dp"
android:layout_height="37dp"
android:layout_marginStart="8dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="8dp"
android:text="Login"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/passwordBox" />
<ProgressBar
android:id="#+id/loginProgressBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="38dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:visibility="invisible"
app:layout_constraintBottom_toTopOf="#+id/spaceInBottom"
app:layout_constraintEnd_toEndOf="#+id/loginButton"
app:layout_constraintStart_toStartOf="#+id/loginButton"
app:layout_constraintTop_toTopOf="#+id/loginButton" />
<TextView
android:id="#+id/registerHereLink"
android:layout_width="63dp"
android:layout_height="12dp"
android:layout_gravity="center_horizontal"
android:layout_marginStart="8dp"
android:layout_marginTop="3dp"
android:layout_marginEnd="8dp"
android:text="Register Here"
android:textSize="10sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/loginButton" />
</androidx.constraintlayout.widget.ConstraintLayout>
The full error -
2019-10-16 01:07:43.323 6109-6109/com.nirkov.hive E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nirkov.hive, PID: 6109
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nirkov.hive/com.nirkov.hive.Activities.ChatMainActivity}: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class android.support.design.widget.AppBarLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class android.support.design.widget.AppBarLayout
Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class android.support.design.widget.AppBarLayout
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.design.widget.AppBarLayout" on path: DexPathList[[zip file "/system/framework/org.apache.http.legacy.boot.jar", zip file "/data/app/com.nirkov.hive-8a2GYMMALuvTn0Up_KEgfw==/base.apk"],nativeLibraryDirectories=[/data/app/com.nirkov.hive-8a2GYMMALuvTn0Up_KEgfw==/lib/x86, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.view.LayoutInflater.createView(LayoutInflater.java:606)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.nirkov.hive.Activities.ChatMainActivity.onCreate(ChatMainActivity.java:38)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

upload login Activity code as well , and tell me which is your parent class

Can you try adding
<item name="windowNoTitle">true</item>
to your main style and see if that works?

Didn't find class "android.support.design.widget.AppBarLayout" on path
Comes from your activity where you set the toolbar wrongly:
mToolbar = (Toolbar) findViewById(R.id.main_app_bar);
setSupportActionBar(mToolbar);
Your toolbar is wrapped by com.google.android.material.appbar.AppBarLayout.
So there's no need to add it into the supportActionBar.
Just define your activity theme as NoActionBar (in your styles.xml) and delete setSupportActionBar(mToolbar); in your activity

How to fix RuntimeException and NullPointerException? [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
I know this has been asked numerous times but since I'am a beginner I couldn't understand any of the solutions.
I wrote a simple app to count up and down from 0 but the app kept crashing.
After reading through StackOverFlow I learnt about Stack trace and found what the problem was but was not able to fix.
Here is my code
MainActivity.java:
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
int counter;
{
counter = 0;
}
Button add,sub;
TextView display;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
counter++;
display.setText("Count: " +counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
counter--;
display.setText("Count: " +counter);
}
});
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="107dp"
android:layout_marginBottom="8dp"
android:text="#string/Title"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.133" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="217dp"
android:text="#string/add"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.754" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="#string/sub"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.511"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button"
app:layout_constraintVertical_bias="0.005" />
</android.support.constraint.ConstraintLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Logcat:
2019-02-17 20:36:55.107 3748-3748/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 3748
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3061)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
at android.os.Handler.dispatchMessage(Handler.java:114)
at android.os.Looper.loop(Looper.java:198)
at android.app.ActivityThread.main(ActivityThread.java:6716)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.myapplication.MainActivity.onCreate(MainActivity.java:22)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2906)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3061) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) 
at android.os.Handler.dispatchMessage(Handler.java:114) 
at android.os.Looper.loop(Looper.java:198) 
at android.app.ActivityThread.main(ActivityThread.java:6716) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

You have declared the button variables (add and sub) and the textview variable (display), but you never assigned the respective Button and TextView objects to them.
You have to create two buttons objects:
add = (Button)findViewById(R.id.button);
sub = (Button)findViewById(R.id.button2);
And also a TextView object:
display = (TextView)findViewById(R.id.textView);
After the assignment you proceed with adding the listeners to the button objects.

Why is Android closing the application without showing the "<application> has stopped unexpectedly" message?

I am in the process of learning Android development and was trying to crash my application at runtime. I made a button that calls a method when clicked and then made sure that the method does not exist.
The application starts up fine. As soon as i click the button, the application closes just as intended. The only unexpected thing was that my device did not show any error message like application has closed unexpectedly or that the application force closed.
Did I accidentally turn off some setting in the Developer Options or is it just my device that doesn't like showing error messages ? Any more information needed ?
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.android.justjava.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Quantity"
android:textAllCaps="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/quantity_text_view"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:textColor="#000000"
android:text="0"
android:textSize="16sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Price"
android:textAllCaps="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/price_text_view"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:textColor="#000000"
android:text="$0"
android:textSize="16sp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="true"
android:text="ORDER"
android:onClick="submitOrder"/>
</LinearLayout>
MainActivity.java:
package com.example.android.justjava;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
/**
* This app displays an order form to order coffee.
*/
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* This method is called when the order button is clicked.
*/
public void submitOrders(View view) {
int quantity = 5 ;
display(quantity) ;
displayPrice(quantity * 50) ;
}
/**
* This method displays the given quantity value on the screen.
*/
private void display(int number) {
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText("" + number);
}
private void displayPrice(int number) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
}
Logcat:
01-20 16:08:54.087 28870-28893/? I/OpenGLRenderer: Initialized EGL,
version 1.4 01-20 16:08:54.087 28870-28893/? D/OpenGLRenderer: Swap
behavior 1 01-20 16:08:58.044 28870-28870/com.example.android.justjava
V/BoostFramework: BoostFramework() : mPerf =
com.qualcomm.qti.Performance#b82000f 01-20 16:08:58.119
28870-28870/com.example.android.justjava D/AndroidRuntime: Shutting
down VM 01-20 16:08:58.120 28870-28870/com.example.android.justjava
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.justjava, PID: 28870
java.lang.IllegalStateException: Could not find method
submitOrder(View) in a parent or ancestor Context for android:onClick
attribute defined on view class
android.support.v7.widget.AppCompatButton
at
android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
at
android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
at android.view.View.performClick(View.java:5642)
at android.view.View$PerformClick.run(View.java:22338)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6209)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 01-20
16:08:58.120 28870-28870/com.example.android.justjava D/AppTracker:
App Event: crash 01-20 16:08:58.132 28870-28870/? I/Process: Sending
signal. PID: 28870 SIG: 9
It's based on this Udacity course.

In your XML button, its submitOrder not submitOrders. See the extra S :
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="true"
android:text="ORDER"
android:onClick="submitOrder"/>
So, change this:
public void submitOrders(View view) {
With this:
public void submitOrder(View view) {

Remove s from method name submitOrders
public void submitOrder(View view) {
int quantity = 5 ;
display(quantity) ;
displayPrice(quantity * 50) ;
}
Or You can remove android:onClick="submitOrder"
<Button
android:id="#+id/order"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="true"
android:text="ORDER"/>
than in your java file
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button order = (Button)findViewById(R.id.order);
order.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int quantity = 5 ;
display(quantity) ;
displayPrice(quantity * 50) ;
}
});
}

Android can't find my OnClick method

I have an issue with this botton, when is clicked the app send a message "ImageButton has stopped". I think it's something dumb, but I just started coding. Details of my code are below.
LogCat:
12-13 21:01:56.659 1075-1075/com.example.christian.imagebutton E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.christian.imagebutton, PID: 1075
java.lang.IllegalStateException: Could not find method llamar(MainActivity)(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatImageButton with id 'boton1'
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Main Activity
package com.example.christian.imagebutton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView tv1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1=(TextView)findViewById(R.id.tv1);
}
public void llamar(View view){
tv1.setText("Llamando");
}
}
And the layout is:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.christian.imagebutton.MainActivity">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/telefono"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/boton1"
android:onClick="llamar(MainActivity)" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/boton1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="22dp"
android:id="#+id/tv1" />
</RelativeLayout>

android:onClick="llamar"
Shouldn't it be like this?

Android just implements the OnClickListener for you when you define the android:onClick="someMethod" attribute.
Those two code snippets are totally the same but just implemented in two different ways.
Code Implementation
Button btn = (Button) findViewById(R.id.mybutton);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
llamar(v);
}
});
// some more code
public void llamar(View v) {
// does something very interesting
}
Above is a code implementation of an OnClickListener. And now the XML implementation.
XML Implementation
<?xml version="1.0" encoding="utf-8"?>
<!-- layout elements -->
<Button android:id="#+id/mybutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click me!"
android:onClick="llamar" />
<!-- even more layout elements -->
Now in the background Android does nothing else than the Java code calling your method on a click event.
Note that with the XML above, Android will look for the onClick method llamar() only in the current Activity. This is important to remember if you are using fragments, since even if you add the XML above using a fragment, Android will not look for the onClick method in the .java file of the fragment used to add the XML.

Application Unfortunately stopped when going from 2nd activity to 3rd activity

I'm new to Android developing. This is an assignment which was given to me. I have to convert the value and the converted value must be shown in the next activity. But when I press the submit button its crashes.I don;t know what is the problem. Is there a problem with my RadioButtons. Please help me...
This is the second activity(ConvertActivity)
package com.gihan.temperatureconverter;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
public class ConvertActivity extends ActionBarActivity {
//RadioButton cel=(RadioButton) findViewById(R.id.rCel);
//RadioButton fah=(RadioButton) findViewById(R.id.rFah);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_convert);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_convert, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void calculation(View view) {
EditText val=(EditText) findViewById(R.id.editText);
int value = Integer.valueOf(val.getText().toString()).intValue();
int ans=0;
int fahval=0;
int celval=0;
boolean checked = ((RadioButton) view).isChecked();
switch(view.getId()) {
case R.id.rCel:
if (checked){
ans=((value-32)*5/9);
fahval=value;
celval=ans;}
break;
case R.id.rFah:
if (checked){
ans=((value*9)/5)+32;
celval=value;
fahval=ans;}
break;
}
/*if (cel.isChecked()){
ans=((value-32)*5/9);
fahval=value;
celval=ans;
}
if (fah.isChecked()){
ans=((value*9)/5)+32;
celval=value;
fahval=ans;
}*/
Intent intent = new Intent(ConvertActivity.this, LastActivity.class);
intent.putExtra("celval", getText(celval));
intent.putExtra("fahval", getText(fahval));
ConvertActivity.this.startActivity(intent);
}
}
This is the 2nd XML(activity_convert)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.gihan.temperatureconverter.ConvertActivity"
android:background="#drawable/ic_background">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/editText"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="50dp"
android:hint="Enter Value"
android:textSize="20dp"/>
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/radioGroup"
android:layout_below="#+id/editText"
android:layout_centerHorizontal="true">
<RadioButton
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="To Celsius"
android:id="#+id/rCel"
android:layout_below="#+id/editText"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:checked="false"
android:gravity="fill_horizontal"
android:textColor="#ffc80301"
android:textSize="25sp"/>
<RadioButton
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="To Fahrenheit"
android:id="#+id/rFah"
android:checked="false"
android:gravity="fill_horizontal"
android:textColor="#ffc80301"
android:textSize="25sp"
android:layout_below="#+id/rCel"
android:layout_alignLeft="#+id/rCel"
android:layout_alignStart="#+id/rCel" />
</RadioGroup>
<Button
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Submit"
android:id="#+id/sub"
android:onClick="calculation"
android:layout_below="#+id/radioGroup"
android:layout_centerHorizontal="true"
android:layout_marginTop="80dp" />
</RelativeLayout>
This is the 3rd activity(LastActivity)
package com.gihan.temperatureconverter;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class LastActivity extends ActionBarActivity {
TextView vFah=(TextView)findViewById(R.id.vFah);
TextView vCel=(TextView)findViewById(R.id.vCel);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_last);//use whatever layout you want.
Bundle extras = getIntent().getExtras();
int celval=extras.getInt("celval");
int fahval=extras.getInt("fahval");
//String cel=String.valueOf(celval);
//String fah=String.valueOf(fahval);
vCel.setText(Integer.toString(celval));
vFah.setText(Integer.toString(fahval));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_convert, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void again(View view) {
Intent intent = new Intent(LastActivity.this, ConvertActivity.class);
LastActivity.this.startActivity(intent);
}
public void home(View view) {
Intent intent = new Intent(LastActivity.this, MainActivity.class);
LastActivity.this.startActivity(intent);
}
}
This is the 3rd XML(activity_last)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/ic_background"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.gihan.temperatureconverter.LastActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Successfully Converted"
android:id="#+id/textView2"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:textColor="#ffff0004"
android:textSize="30sp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Home"
android:id="#+id/button2"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="70dp"
android:gravity="center_horizontal"
android:textSize="25sp"
android:onClick="home"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Calculate again"
android:id="#+id/button3"
android:layout_marginBottom="45dp"
android:gravity="center_horizontal"
android:layout_above="#+id/button2"
android:layout_centerHorizontal="true"
android:textSize="25sp"
android:onClick="again"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Fahrenheit"
android:id="#+id/textView3"
android:layout_below="#+id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:textColor="#ff0010ff" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Celsius"
android:id="#+id/textView4"
android:layout_below="#+id/textView3"
android:layout_centerHorizontal="true"
android:layout_marginTop="52dp"
android:textColor="#ff0010ff" />
<TextView
android:layout_width="wrap_content"
android:layout_height="20sp"
android:id="#+id/vFah"
android:layout_below="#+id/textView3"
android:layout_centerHorizontal="true"
android:textColor="#ff9300ff"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="20sp"
android:id="#+id/vCel"
android:layout_below="#+id/textView4"
android:layout_centerHorizontal="true"
android:textColor="#ff9300ff"/>
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gihan.temperatureconverter" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ConvertActivity"
android:label="#string/app_name">
</activity>
<activity
android:name=".LastActivity"
android:label="#string/app_name">
</activity>
</application>
</manifest>
Logcat
--------- beginning of crash
06-09 21:05:58.413 2381-2381/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.gihan.temperatureconverter, PID: 2381
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:4020)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassCastException: android.support.v7.widget.AppCompatButton cannot be cast to android.widget.RadioButton
at com.gihan.temperatureconverter.ConvertActivity.calculation(ConvertActivity.java:56)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Some Comments were some ways I tried. It's also failed.
And also this is Android Studio Project.

Your Error Solved Check this code
mainactivity.java
public class MainActivity extends ActionBarActivity {
EditText val;
public static int ans;
public static String fahval="";
public static String celval="";
RadioButton Box1,Box2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
val =(EditText) findViewById(R.id.editText);
}
public void calculation(View v)
{
//get value from edit text box and convert into double
double a=Double.parseDouble(String.valueOf(val.getText()));
Box1 = (RadioButton) findViewById(R.id.rCel);
Box2 = (RadioButton) findViewById(R.id.rFah);
//check which radio button is checked
if(Box1.isChecked())
{
//display conversion
celval = String.valueOf(f2c(a));
// Toast.makeText(getApplicationContext(), celval,Toast.LENGTH_LONG).show();
Box1.setChecked(true);
}
else
{
fahval = String.valueOf(c2f(a));
// Toast.makeText(getApplicationContext(), fahval,Toast.LENGTH_LONG).show();
Box2.setChecked(true);
}
Intent intent = new Intent(this, LastActivity.class);
intent.putExtra("celval", celval);
intent.putExtra("fahval", fahval);
startActivity(intent);
}
//Celcius to Fahrenhiet method
private double c2f(double c)
{
return (c*9)/5+32;
}
//Fahrenhiet to Celcius method
private double f2c(double f)
{
return (f-32)*5/9;
}
}
LastActivity.java
public class LastActivity extends ActionBarActivity {
TextView vFah;
TextView vCel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.last);//use whatever layout you want.
vFah=(TextView)findViewById(R.id.vFah);
vCel=(TextView)findViewById(R.id.vCel);
Bundle extras = getIntent().getExtras();
String celval=extras.getString("celval");
String fahval=extras.getString("fahval");
//String cel=String.valueOf(celval);
//String fah=String.valueOf(fahval);
vCel.setText(celval);
vFah.setText(fahval);
}
public void again(View view) {
Intent intent = new Intent(LastActivity.this, MainActivity.class);
LastActivity.this.startActivity(intent);
}
public void home(View view) {
Intent intent = new Intent(LastActivity.this, MainActivity.class);
LastActivity.this.startActivity(intent);
}
}

I was building some apps this week, and couldn't figure out why I couldn't navigate from the Main Activity to a second activity and from there to a 3rd level activity (that would pop to 2nd activity), and app kept crashing when I added the 3rd. Finally looked in the Logcat to figure out what's wrong, and then read "Cannot Navigate from 'second activity'.... This View will not accept Navigation". Searched through code to find errors, but Never thought to look there before.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Why does the app crashes when second activity is launched? - android

Try this: Intent i=new Intent(MainActivity.this, Seek.class); startActivity(i); Hope it helps!!

Related

InflateException at spefic case, what am I missing?

How to fix RuntimeException and NullPointerException? [duplicate]

Why is Android closing the application without showing the "<application> has stopped unexpectedly" message?

Android can't find my OnClick method

Application Unfortunately stopped when going from 2nd activity to 3rd activity

Categories

Resources