Navigation With CountDownTimer

Navigation With CountDownTimer - android

I am trying to develop an application whereby there would be one activity with a start button. Upon pressing the start button, it would lead me to a new activity where the timer starts to run. I am only able to make it run when both buttons and textview is on the same page. However, I would like to have button on one activity and textview on another activity.
Java File:
import android.content.DialogInterface;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class MainActivity extends AppCompatActivity {
Button buttonStart;
TextView textCounter;
MyCountDownTimer myCountDownTimer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonStart = (Button)findViewById(R.id.start);
textCounter = (TextView)findViewById(R.id.counter);
buttonStart.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
myCountDownTimer = new MyCountDownTimer(30000, 1000, textCounter);
myCountDownTimer.start();
}
});
}
public class MyCountDownTimer extends CountDownTimer {
private TextView textCounter;
public MyCountDownTimer(long millisInFuture, long countDownInterval, TextView textCounter) {
super(millisInFuture, countDownInterval);
this.textCounter = textCounter;
}
#Override
public void onTick(long millisUntilFinished){
this.textCounter.setText(millisUntilFinished / 1000l + " seconds remaining ");
}
#Override
public void onFinish() {
this.textCounter.setText("Finished");
}
}
#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);
}
}
Main_Activity:
<Button
android:id="#+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/Button"
android:clickable="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
Main_Activity2:
<TextView
android:id="#+id/counter"
android:layout_width="300dp"
android:layout_height="300dp"
android:textStyle="bold"
android:textSize="50sp"
android:gravity="center"
android:layout_marginTop="50dp"
android:clickable="false"
android:enabled="false" />

Try this Code:
The code for Layout 1: activity_main.xml , Only with start button
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="Start" />
</LinearLayout>
The code for Layout 2: count_down_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/counter"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginLeft="50dp"
android:layout_marginTop="50dp"
android:gravity="center"
android:textSize="50sp"
android:textStyle="bold" />
</LinearLayout>
Java file: MainActivity.java
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
private Context mContext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
Button startBrowser = (Button) findViewById(R.id.start);
startBrowser.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivity(new Intent(mContext, CountDownActivity.class));
}
});
}
#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;
}
}
Java File 2: CountDownActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.Menu;
import android.widget.TextView;
public class CountDownActivity extends Activity {
TextView textCounter;
MyCountDownTimer myCountDownTimer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.count_down_activity);
textCounter = (TextView)findViewById(R.id.counter);
myCountDownTimer = new MyCountDownTimer(30000, 1000, textCounter);
myCountDownTimer.start();
}
public class MyCountDownTimer extends CountDownTimer {
private TextView textCounter;
public MyCountDownTimer(long millisInFuture, long countDownInterval, TextView textCounter) {
super(millisInFuture, countDownInterval);
this.textCounter = textCounter;
}
#Override
public void onTick(long millisUntilFinished) {
this.textCounter.setText(millisUntilFinished / 1000l + " seconds remaining : ");
}
#Override
public void onFinish() {
this.textCounter.setText("Finished");
}
}
#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;
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidsample"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.androidsample.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="com.example.androidsample.CountDownActivity"
android:screenOrientation="portrait" >
</activity>
</application>
</manifest>

Related

Android Studio CountDownTimer Navigation

I am trying to develop an application where on one layout, there would only be a start button and upon hitting the start button, it would navigate to another layout where the countdowntimer would start running automatically. I am able to implement the countdowntimer but when i try to navigate to another activity after pressing the start button, the application crashed. Please tell me if there is an approach to do it. Thanks
The code for Layout 1: Only with start button
<Button
android:id="#+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Start"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:clickable="true"
android:onClick="action1" />
The code for Layout 2:
<TextView
android:id="#+id/counter"
android:layout_width="100dp"
android:layout_height="100dp"
android:textStyle="bold"
android:textSize="50sp"
android:gravity="center"
android:layout_marginLeft="250dp"
android:layout_marginTop="50dp" />
Lastly this is the Java file:
public class MainActivity extends AppCompatActivity {
Button buttonStart;
TextView textCounter;
MyCountDownTimer myCountDownTimer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_countdown);
buttonStart = (Button)findViewById(R.id.start);
textCounter = (TextView)findViewById(R.id.counter);
buttonStart.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
myCountDownTimer = new MyCountDownTimer(30000, 1000);
myCountDownTimer.start();
}});
}
public class MyCountDownTimer extends CountDownTimer {
public MyCountDownTimer(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
#Override
public void onTick(long millisUntilFinished) {
textCounter.setText(millisUntilFinished / 1000 + " seconds remaining : ");
}
#Override
public void onFinish() {
textCounter.setText("Finished");
}
}
#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);
}
public void action1(View View){setContentView(R.layout.activity_main);}
These are the errors that i received in logcat
--------- beginning of crash
10-09 03:36:02.651 2183-2183/com.fluke.kgwee.flukegame E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.fluke.kgwee.flukegame, PID: 2183
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at com.fluke.kgwee.flukegame.MainActivity$MyCountDownTimer.onTick(MainActivity.java:46)
at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:133)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Try this Code:
The code for Layout 1: activity_main.xml , Only with start button
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="Start" />
</LinearLayout>
The code for Layout 2: count_down_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/counter"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginLeft="50dp"
android:layout_marginTop="50dp"
android:gravity="center"
android:textSize="50sp"
android:textStyle="bold" />
</LinearLayout>
Java file: MainActivity.java
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
private Context mContext;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
Button startBrowser = (Button) findViewById(R.id.start);
startBrowser.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivity(new Intent(mContext, CountDownActivity.class));
}
});
}
#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;
}
}
Java File 2: CountDownActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.Menu;
import android.widget.TextView;
public class CountDownActivity extends Activity {
TextView textCounter;
MyCountDownTimer myCountDownTimer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.count_down_activity);
textCounter = (TextView)findViewById(R.id.counter);
myCountDownTimer = new MyCountDownTimer(30000, 1000, textCounter);
myCountDownTimer.start();
}
public class MyCountDownTimer extends CountDownTimer {
private TextView textCounter;
public MyCountDownTimer(long millisInFuture, long countDownInterval, TextView textCounter) {
super(millisInFuture, countDownInterval);
this.textCounter = textCounter;
}
#Override
public void onTick(long millisUntilFinished) {
this.textCounter.setText(millisUntilFinished / 1000l + " seconds remaining : ");
}
#Override
public void onFinish() {
this.textCounter.setText("Finished");
}
}
#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;
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidsample"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.androidsample.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="com.example.androidsample.CountDownActivity"
android:screenOrientation="portrait" >
</activity>
</application>
</manifest>

Activity not launching even after I add it in AndroidManifest file

I'm new to Android. I read similar posts but I cannot solve my problem.
I added all my activities in androidManifest file, but I cannot move from Second Activity to ThirdActivity using Intent.
Here is MainActivity.java
package com.mobi.crazycalc;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
Intent in= new Intent(MainActivity.this,SecondActivity.class);
MainActivity.this.startActivity(in);
MainActivity.this.finish();
}
}, 1000);
}
#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;
}
}
here is SecondActivity.java
package com.mobi.crazycalc;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class SecondActivity extends Activity {
EditText name1;
EditText name2;
Button goButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
name1= (EditText) findViewById(R.id.name1);
name2=(EditText) findViewById(R.id.name2);
goButton= (Button) findViewById(R.id.gobutton);
final String hisName=name1.getText().toString().trim();
final String herName=name2.getText().toString().trim();
goButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Love lv=new Love();
int result=lv.getLovePer(hisName, herName);
Intent in=new Intent(SecondActivity.this,ThirdActivity.class);
in.putExtra("Result", result);
startActivity(in);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
}
Here is ThirdActivity.java
package com.mobi.crazycalc;
import java.util.Random;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class ThirdActivity extends Activity {
TextView meter;
Button goBackButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
meter = (TextView) findViewById(R.id.meter);
goBackButton = (Button) findViewById(R.id.gobackbutton);
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent in=new Intent(ThirdActivity.this,SecondActivity.class);
startActivity(in);
}
});
Random ran= new Random();
for(int i=0;i<100;++i)
{
int ranNo=ran.nextInt(100);
meter.setText(ran.toString());
}
Bundle bund=getIntent().getExtras();
int res=bund.getInt("Result");
meter.setText(res);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.third, menu);
return true;
}
}
this is the manifest file-
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobi.crazycalc"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.mobi.crazycalc.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="com.mobi.crazycalc.SecondActivity"
android:label="#string/title_activity_second" >
</activity>
<activity
android:name="com.mobi.crazycalc.ThirdActivity"
>
</activity>
</application>
</manifest>
activity-second.xml:
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="#e52850"
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=".SecondActivity" >
<EditText
android:id="#+id/name1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="57dp"
android:ems="10"
android:hint="#string/name1Edittext"
android:textColor="#color/almond" >
<requestFocus />
</EditText>
<Button
android:id="#+id/gobutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/name2"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:background="#android:color/transparent"
android:text="#string/buttontext"
android:textColor="#color/aeroBlue" />
<EditText
android:id="#+id/name2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/name1"
android:layout_below="#+id/name1"
android:layout_marginTop="41dp"
android:ems="10"
android:hint="#string/name2Edittext"
android:textColor="#color/almond" />
</RelativeLayout>

Try This one
And you can check this here
In MainActiviy
package com.mobi.crazycalc;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
Intent in = new Intent(MainActivity.this, SecondActivity.class);
MainActivity.this.startActivity(in);
MainActivity.this.finish();
}
}, 1000);
}
#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;
}
}
In SecondAcivity
package com.mobi.crazycalc;
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.Button;
import android.widget.EditText;
public class SecondActivity extends ActionBarActivity {
EditText name1;
EditText name2;
Button goButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
name1 = (EditText) findViewById(R.id.name1);
name2 = (EditText) findViewById(R.id.name2);
goButton = (Button) findViewById(R.id.gobutton);
final String hisName = name1.getText().toString().trim();
final String herName = name2.getText().toString().trim();
goButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent in = new Intent(SecondActivity.this, ThirdActivity.class);
in.putExtra("Result", "value");
startActivity(in);
}
});
}
#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_second, 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);
}
}
In Third activity
package com.mobi.crazycalc;
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.Button;
import android.widget.TextView;
import java.util.Random;
public class ThirdActivity extends ActionBarActivity {
TextView meter;
Button goBackButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
meter = (TextView) findViewById(R.id.meter);
goBackButton = (Button) findViewById(R.id.gobackbutton);
goBackButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent in = new Intent(ThirdActivity.this, SecondActivity.class);
startActivity(in);
}
});
Random ran = new Random();
for (int i = 0; i < 100; ++i) {
int ranNo = ran.nextInt(100);
meter.setText(ran.toString());
}
Bundle bund = getIntent().getExtras();
String res = bund.get("Result").toString();
meter.setText(res);
}
#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_third, 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);
}
}
and In menifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobi.crazycalc" >
<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=".SecondActivity"
android:label="#string/title_activity_second" >
</activity>
<activity
android:name=".ThirdActivity"
android:label="#string/title_activity_third" >
</activity>
</application>
</manifest>
Hope it will help you.

Cannot add object with Parse

With my Android project created with latest version of Eclipse+ADT I cannot access parse.com api. If I use the prepackaged project from parse.com I can access. But If I create a new Android project from scratch I cannot. I suspect the problem is because of parse initialization and fragments. As prepackaged project from parse.com doesn't use fragments. In this program first button should add an object to database but that doesnt work.. Can anyone know solution for this?
activity_main.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.deneme.MainActivity"
tools:ignore="MergeRootFrame" />
fragment_main.xml:
<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.deneme.MainActivity$PlaceholderFragment" >
<LinearLayout
android:id="#+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:orientation="vertical"
android:paddingBottom="1.0dip"
android:paddingLeft="4.0dip"
android:paddingRight="4.0dip"
android:paddingTop="5.0dip"
android:layout_below="#+id/txtTitle">
<Button
android:id="#+id/btnCreate"
android:layout_width="fill_parent"
android:layout_height="0.0dip"
android:layout_weight="1.0"
android:text="Add Object"
android:textColor="#android:color/white"
android:textSize="25sp" />
<Button
android:id="#+id/btnIncrement"
android:layout_width="fill_parent"
android:layout_height="0.0dip"
android:layout_weight="1.0"
android:text="Increment votes"
android:textColor="#android:color/white"
android:textSize="25sp" />
</LinearLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.deneme"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:name="denemeApp"
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.deneme.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>
</application>
denemeApp.java
package com.example.deneme;
import com.parse.Parse;
import com.parse.ParseACL;
import com.parse.ParseUser;
import android.app.Application;
public class denemeApp extends Application {
#Override
public void onCreate() {
super.onCreate();
// Add your initialization code here
Parse.initialize(this, "KEY1", "KEY2");
ParseUser.enableAutomaticUser();
ParseACL defaultACL = new ParseACL();
// If you would like all objects to be private by default, remove this line.
defaultACL.setPublicReadAccess(true);
ParseACL.setDefaultACL(defaultACL, true);
}
}
MainActivity.java:
package com.example.deneme;
import com.example.deneme.R;
import com.parse.GetCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
#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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
Button btnCreate = (Button)rootView.findViewById(R.id.btnCreate);
btnCreate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ParseObject testObject = new ParseObject("testobject");
testObject.put("total_votes", 0);
testObject.saveInBackground();
}
});
Button btnIncrement = (Button)rootView.findViewById(R.id.btnIncrement);
btnIncrement.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//works with "testobject" and "7erUqKQn1P"
//doesnt work "testobject2" and "1g68ZP1ikc"
ParseQuery<ParseObject> query = ParseQuery.getQuery("testobject");
query.getInBackground("7erUqKQn1P", new GetCallback<ParseObject>()
{
public void done(ParseObject vote, ParseException e)
{
if(e == null)
{
vote.increment("total_votes");
vote.saveInBackground();
}
}//done
}//new GetCallback
);//query.getInBackground
}
});
return rootView;
}
}
}

You need to add this permission to your AndroidManifest.xml file
<uses-permission android:name="android.permission.INTERNET" />

Problems with the event treatment of a Button

Something very weird is happening in my program. I try to use the button with the first program below (using an emulator) and the program did not even open. So I changed to the second version, using the android:OnClick, and it did not work either (the program opened, but in the click it crashed). Then I tried the third program, using android:onCLick and the instanciation of the EditText in the treatment function, and the program worked.
Can someone explain to me why the first two programs did not worked?
Edit: I noticed now that LogCat is pointing to the following error: error opening trace file: No such file oor directory (2), what is that? Can it have any relation to this error?
And if I comment the definition of the onClickListener to b1 the program do not crash anymore.
First code:
package app.projetnf33;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class MainActivity extends Activity implements OnClickListener{
String[] names;
EditText status;
EditText par1;
EditText par2;
EditText par3;
Button b1;
Button b2;
Button b3;
Button b4;
Spinner spin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
status = (EditText) findViewById(R.id.text);
b1 = (Button) findViewById(R.id.b1);
b1.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
status.setText("Connect");
}
});
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
#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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
Second code
package app.projetnf33;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class MainActivity extends Activity implements OnClickListener{
String[] names;
EditText status;
EditText par1;
EditText par2;
EditText par3;
Button b1;
Button b2;
Button b3;
Button b4;
Spinner spin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
status = (EditText) findViewById(R.id.text);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
public void treatment_connect(View v){
status.setText("Connect");
}
public void treatment_persons(View v){
status.setText("Persons");
}
public void treatment_lecture(View v){
status.setText("Lecture");
}
public void treatment_execute(View v){
status.setText("Execute");
}
#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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
Third code (which worked):
package app.projetnf33;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class MainActivity extends Activity implements OnClickListener{
String[] names;
EditText status;
EditText par1;
EditText par2;
EditText par3;
Button b1;
Button b2;
Button b3;
Button b4;
Spinner spin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
public void treatment_connect(View v){
status = (EditText) findViewById(R.id.text);
status.setText("Connect");
}
public void treatment_persons(View v){
status.setText("Persons");
}
public void treatment_lecture(View v){
status.setText("Lecture");
}
public void treatment_execute(View v){
status.setText("Execute");
}
#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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
Fragment_layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/tex_status" />
<EditText
android:id="#+id/text"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<Spinner
android:id="#+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/par1" />
<EditText
android:id="#+id/par1"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/par2" />
<EditText
android:id="#+id/par2"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/par3" />
<EditText
android:id="#+id/par3"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/b1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/ic_action_usb"
android:gravity="center_vertical"
android:text="#string/connect"
android:onClick="treatment_connect" />
<Button
android:id="#+id/b2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/ic_action_computer"
android:gravity="center_vertical"
android:text="#string/read"
android:onClick="treatment_lecture" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/b3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/ic_action_accept"
android:gravity="center_vertical"
android:text="#string/execution"
android:onClick="treatment_execution" />
<Button
android:id="#+id/b4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/ic_action_warning"
android:gravity="center_vertical"
android:text="#string/disconnect"
android:onClick="treatment_disconnect" />
</LinearLayout>
</LinearLayout>

In the first and seconds layout you tried to call
status = (EditText) findViewById(R.id.text);
b1 = (Button) findViewById(R.id.b1);
before
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
So you tried to reference a Button and EditText contained in the PlaceholderFragment layout before you created the fragment.

The views are in the fragment layout. It only becomes a part of the activity view hierarchy after the fragment transaction has been run. Your pending fragment transaction is executed in activity super.onStart() which comes only after onCreate(). In essence, you're calling findViewById() too early in the first two versions. The third version works because the findViewById() is in the click handler and gets invoked when the fragment is attached to the activity.
Usually you'd call findViewById() to set up listeners and so on at the earliest possibility in fragment onCreateView(), just after the fragment layout is inflated.

Starting a new Activity-Application stops working

I am trying to build a simple app for a school assignment. When the user clicks on the image button a new view opens up with a picture of the image.However whenever a user clicks on the image in my application the it stops. The logcat error says says at android view.view.onclick, but I can't see where the mistake is. Thanks in advance.
main_activity.java
package com.example.kids;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageButton;
public class MainActivity extends Activity {
#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;
}
public void apple(ImageButton buttona){
Intent intent = new Intent(this, Apple.class);
startActivity(intent);
}
public void banana(ImageButton buttonb){
Intent intent = new Intent(this, Banana.class);
startActivity(intent);}
public void strawberry(ImageButton buttons){
Intent intent = new Intent(this, Strawberry.class);
startActivity(intent);
}}
Apple.java
package com.example.kids;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class Apple extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_apple);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.apple, menu);
return true;
}
}
Activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="100"
android:orientation="vertical" >
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="9.93"
android:text="Pick a fruit"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="30"
android:src="#drawable/applebudget"
android:onClick="apple"
/>
<ImageView
android:id="#+id/imageView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="30"
android:src="#drawable/bananabudget"
android:onClick="banana"
/>
<ImageView
android:id="#+id/imageView3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="30"
android:src="#drawable/strawberrybudget"
android:onClick="strawberry"
/>
</LinearLayout>

Change the method signatures of onClick() methods:
public void apple(View buttona){}
public void banana(View buttonb){}
public void strawberry(View buttons){}
And you are done.

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.

Navigation With CountDownTimer - android

Related

Android Studio CountDownTimer Navigation

Activity not launching even after I add it in AndroidManifest file

Cannot add object with Parse

Problems with the event treatment of a Button

Starting a new Activity-Application stops working

Categories

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