Develop Reference

Error inflating class fragment in Android popular movies app

After i made some changes in an AsynTask i get this error when running the app:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.popularmovies/com.example.android.popularmovies.MainActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class fragment
This is the activity_main.xml file.
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/fragment"
android:name="com.example.android.popularmovies.MainActivityFragment"
tools:layout="#layout/fragment_main"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
And this is the MainActivity.java file:
package com.example.android.popularmovies;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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_main, 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);
}
}
Thanks for any help you can provide! ;)

I am not sure try the following:
Add
tools:context= ".MainActivity"
or Can you put <fragment> inside a <FrameLayout>.
Clean the code once.

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lab02pc19

I know there are many equal to the problems but none of the many who have read is equal to mine or has worked for me for help , so it is going to require your help.
I'm working on an application with a NavigationDrawer , I need to make an image work for me on and off the bluetooth cell .
I made another code separately with an " empty activity" and if I worked, but in the navigariondrawe that is where I need it to work , but it does not work , I 've tried many things , but I hope you can help me .
FATAL EXCEPTION: main
Process: com.example.lab02pc19.myapplication2, PID: 5146
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lab02pc19.myapplication2/com.example.lab02pc19.myapplication2.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference
at com.example.lab02pc19.myapplication2.MainActivity.setImagenBluetooth(MainActivity.java:69)
at com.example.lab02pc19.myapplication2.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6245)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5443) 
at java.lang.reflect.Method.invoke(Native Method) 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.lab02pc19.myapplication2">
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<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"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package com.example.lab02pc19.myapplication2;
import android.bluetooth.BluetoothAdapter;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, FragmentBlue.OnFragmentInteractionListener {
ImageView miimagen;
BluetoothAdapter adaptador_bluetooth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
miimagen= (ImageView)findViewById(R.id.ivw);
adaptador_bluetooth= BluetoothAdapter.getDefaultAdapter();
if(adaptador_bluetooth==null)
{
miimagen.setVisibility(View.GONE);
}
else
{
setImagenBluetooth(adaptador_bluetooth.isEnabled());
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
public void clickImagen(View view)
{
switch (view.getId())
{
case R.id.ivw:
setEstadoBluetooth();
break;
}
}
public void miimagen()
{
setEstadoBluetooth();
}
public void setImagenBluetooth(boolean valor)
{
if(valor)miimagen.setImageResource(R.drawable.ic_action_bluetooth);
}
public void setEstadoBluetooth()
{
if(adaptador_bluetooth.isEnabled())
{
setImagenBluetooth(false);
adaptador_bluetooth.disable();
}
else
{
setImagenBluetooth(true);
adaptador_bluetooth.enable();
}
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
boolean FragmenTransaction= false;
Fragment fragment = null;
if (id == R.id.nav_camera) {
fragment = new FragmentBlue();
FragmenTransaction= true;
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
if(FragmenTransaction)
{
getSupportFragmentManager().beginTransaction().replace(R.id.content_main,fragment).commit();
item.setChecked(true);
getSupportActionBar().setTitle(item.getTitle());
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onFragmentInteraction(Uri uri) {
}
}
<FrameLayout 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"
tools:context="com.example.lab02pc19.myapplication2.FragmentBlue">
<!-- TODO: Update blank fragment layout -->
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/ivw"
android:layout_gravity="left|top"
android:background="#drawable/ic_action_bluetooth"
android:clickable="true"
android:onClick="clickImagen"
android:contentDescription="#string/imagen" />
</FrameLayout>

As I think (it is not enough info), you want to create a fragment in the activity and make some actions with ImageView further. But you didn't create the fragment and try to find ImageView by id in other layout - thus, the image view didn't exist here, next you try to call function of the null object and finally have a NPE and crash. You need to read tutorial about fragment in Android: https://developer.android.com/training/basics/fragments/index.html

You are trying to access the image view of the fragment in your activity class which is not possible that's why giving null point exception. What you can do it that you can setImage in the image view in you fragment java class in onActivityCreated override method after setting the contentView.
If you want to set the image from the activity only then you can create the public method in the fragment and call the method from the activity.

adapter.add() crashes application

I have problem with the adapter.add() method. It causes my app to crash.
My MainActivity is here:
package com.example.olev.shoppinglist;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends ActionBarActivity {
ArrayList<String>productNames=new ArrayList<String>();
ArrayAdapter<String> adapter;
public void addNewProduct(View view){
Intent i = new Intent(this,AddProduct.class);
startActivity(i);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addToList();
ListView productList=(ListView)findViewById(R.id.productList);
adapter = new CustomAdapter(this,productNames);
productList.setAdapter(adapter);
}
public void addToList(){
Bundle itemData=getIntent().getExtras();
if(itemData==null){
return ;
}
String product=itemData.getString("product");
productNames.add(product);
//adapter.notifyDataSetChanged();
}
#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_main, 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);
}
}
also my AddProduct:
package com.example.olev.shoppinglist;
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;
public class AddProduct extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_product);
}
public void sendProductToMain(View view){
EditText productName= (EditText)findViewById(R.id.productName);
String product= productName.getText().toString();
Intent i = new Intent (this,MainActivity.class);
i.putExtra("product",product);
startActivity(i);
}
#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_add_item, 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);
}
}
Other than that im using CustomAdapter which extends ArrayAdapter.
My problem is that if I run this code like it is, I can add item to listview, but as I try to add another one the first one gets overwritten. So I have only one item all the time. If I remove comment on line adapter.notifyDataSetChanged(); the app crashes when reaching to this line.
I have also tried adapter.add(product); The result is the same as the line above - app crashes.
I have searched for answer in here, but can't find it.
My question is how to fix it so that I could dynamically add item to ListView??
EDIT:
The error message im getting
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.olev.shoppinglist/com.example.olev.shoppinglist.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
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:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference
at com.example.olev.shoppinglist.MainActivity.addToList(MainActivity.java:48)
at com.example.olev.shoppinglist.MainActivity.onCreate(MainActivity.java:32)
at android.app.Activity.performCreate(Activity.java:5937)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)

It's because you are sending String in place of List from your first activity to another activity.
i.e. Suppose the line putExtra("product","Item1") is for sending a string item item1 in your second activity. When you call your second activity, list is intialized again and only one item i.e. "Item1" is added to the list.
To send list, you can use intent.putParcelableArrayListExtra("key",value); method.

Could-not create the view: org.eclipse.pde.runtime.LogView

I am new to Android and building a small test program and the program is not running and giving me Could not create the view: org.eclipse.pde.runtime.LogView error
here is the code from my android_main.xml file
<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: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.myapplication.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
Here is the java code from MainActivity.Java
package com.example.myapplication;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

I apologize that I am posting this as an answer instead of a comment, but commenting requires 50 reputation and I don't have that yet. Can you post your java code too? The problem is likely in there, it may be the method by which you are loading the view.

when i change my HomePage activity to extend from ListView, menu items are no longer visible.

in my homepage activity i have a menu within my app which consists of an update button which is set to "always" visible, and a logout button which is set to "never" visible. currently the homepage activity extends from ActionBarActivity, however, when i change the activity so extends from listActivity, the menu is no longer there. is there a solution to this?
activity_homepage.xml
<?xml version="1.0"?>
<RelativeLayout tools:context=".MainActivity" android:paddingBottom="#dimen/activity_vertical_margin" android:paddingTop="#dimen/activity_vertical_margin" android:paddingRight="#dimen/activity_horizontal_margin" android:paddingLeft="#dimen/activity_horizontal_margin" android:layout_height="match_parent"
android:layout_width="match_parent" xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android">
</RelativeLayout>
menu_homepage.xml
<?xml version="1.0"?>
-<menu tools:context=".MainActivity" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="#string/action_settings" app:showAsAction="never" android:orderInCategory="100" android:id="#+id/action_settings"/>
<item android:title="Update" app:showAsAction="always" android:id="#+id/updateStatus"/>
<item android:title="Logout" app:showAsAction="never" android:id="#+id/LogoutUser"/>
</menu>
package com.exchange345.exchangeapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import com.parse.ParseUser;
public class HomePageActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_homepage);
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser != null) {
// show user the homepage
} else {
// TAKE USER TO LOGIN
Intent takeUserToLogin = new Intent (this, LoginActivity.class);
startActivity(takeUserToLogin);
}
}
#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_homepage, 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
switch(id){
case R.id.updateStatus:
//take user to update status activity
Intent intent = new Intent(this, UpdateStatusActivity.class);
startActivity(intent);
break;
case R.id.LogoutUser:
//logout the user
//user goes back to log in activity
Intent takeUserToLogin = new Intent(this, LoginActivity.class);
startActivity(takeUserToLogin);
ParseUser.logOut();
break;
}
return super.onOptionsItemSelected(item);
}
}