how do i make an android application that run at the background?

how do i make an android application that run at the background? - android

I have an the following android application that prints the copied text by the user...
MainActivity.java
package com.example.backgroundrunning;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ClipboardManager;
import android.content.Intent;
import android.view.Menu;
import android.widget.EditText;
import android.widget.TextView;
#SuppressLint("NewApi")
public class MainActivity extends Activity implements ClipboardManager.OnPrimaryClipChangedListener{
ClipboardManager clipBoard;
TextView tv;
EditText edit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.note);
edit=(EditText)findViewById(R.id.edit);
clipBoard = (ClipboardManager)getSystemService(CLIPBOARD_SERVICE);
clipBoard.addPrimaryClipChangedListener( this );
startService(new Intent(this,ExampleService.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;
}
#Override
public void onPrimaryClipChanged() {
ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
String test=clipboard.getText().toString();
tv.setText(test);
}
}
ExampleService.java
package com.example.backgroundrunning;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
public class ExampleService extends Service {
#Override
public void onCreate() {
// The service is being created
}
public int onStartCommand(Intent intent, int flags, int startId) {
// handleCommand(intent);
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
#Override
public void onRebind(Intent intent) {
// A client is binding to the service with bindService(),
// after onUnbind() has already been called
}
#Override
public void onDestroy() {
// The service is no longer used and is being destroyed
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
i want to make my program that run at the background silently,
means it doesn't close when the user presses back button
I found this code and added that to my program just like the above code,
But it doesn't work...
What is the problem?
And here is my manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.backgroundrunning"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.backgroundrunning.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>
</manifest>

#Override
public void onBackPressed()
{
Intent i= new Intent(Intent.ACTION_MAIN);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addCategory(Intent.CATEGORY_HOME);
startActivity(i);
or
Intent i= new Intent(Intent.ACTION_ALL_APPS);
startActivity(i);
}

Related

broadCast Receiver is never called

I am trying to detect if the WiFi is connected or not by listening to the "SUPPLICANT_CONNECTION_CHANGE_ACTION" as shown below in the code. But the problem is
when i run the App i receive no notificatio from the broadCast Receiver i am registered to!!
why that is happening and how to solve it?
code:
IntentFilter intentFilter2 = new IntentFilter(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ConnectivityModule();
}
protected void ConnectivityModule() {
// TODO Auto-generated method stub
Log.d(TAG, "#interNetConnectivityModule: called");
registerReceiver(SupplicantReceiver, intentFilter2);
}
BroadcastReceiver SupplicantReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
final String action = intent.getAction();
if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {
SupplicantState supplicantState = (SupplicantState)intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);
if (supplicantState == (SupplicantState.COMPLETED)) {
Log.d(TAG, "#SupplicantReceiver: connected");
}
if (supplicantState == (SupplicantState.DISCONNECTED)) {
Log.d(TAG, "#SupplicantReceiver: not connected");
}
}
}
};

Here is Example :
Main Activity
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.content.Intent;
import android.view.View;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
// broadcast a custom intent.
public void broadcastIntent(View view)
{
Intent intent = new Intent();
intent.setAction("com.tutorialspoint.CUSTOM_INTENT");
sendBroadcast(intent);
}
}
My Broadcast Receiver :
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();
}
}
This is how you should declare Broadcast Receiver in your Manifest :
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloworld"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name="MyReceiver">
<intent-filter>
<action android:name="com.tutorialspoint.CUSTOM_INTENT">
</action>
</intent-filter>
</receiver>
</application>
</manifest>
Main.xml
<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/btnStartService"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/broadcast_intent"
android:onClick="broadcastIntent"/>
</LinearLayout>

Your receiver looks correctly registered (at runtime, not based on Manifest, but whatever, should be good anyway).
I'm guessing.. have you tried putting logs in onReceive method like
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.d(TAG, "Reached this point, receiver is working");
final String action = intent.getAction();
if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {
SupplicantState supplicantState = (SupplicantState)intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);
if (supplicantState == (SupplicantState.COMPLETED)) {
Log.d(TAG, "#SupplicantReceiver: connected");
}
if (supplicantState == (SupplicantState.DISCONNECTED)) {
Log.d(TAG, "#SupplicantReceiver: not connected");
}
Log.d(TAG, "Checking for an error in retrieving data!");
boolean myTest = intent.getBooleanExtra(EXTRA_SUPPLICANT_CONNECTED, false);
if (myTest) Log.d(TAG, "This way it worked!");
else Log.d(TAG, "This does not mean it didn't work at all! Might just be the correct value as a DISCONNECTED status");
} else Log.d(TAG, "Bizzarre error, action received was different from the one receiver was registered to! [ " + action + " ] ");
}
My guess is that you might be trying to retrieve the information in a wrong way, and with logs so strictly defined you can't see enough of what happens, but the receiver works fine

simple navigation from 2nd activity to 3rd activity in android without passing any values

From first activity to second activity navigation is working but second activity to third activity navigation is not working in android can any1 please help me.
This is my MainActivity.java
package com.exampl.test;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.app.Activity;
import android.view.View;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void activity2(View view){
Intent intent = new Intent(this,com.exampl.test.MainActivity2.class);
startActivity(intent);
}
#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;
}
}
This is my MainActivity2.java
package com.exampl.test;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity2 extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
public void activity3(View view){
Intent intent = new Intent(this,com.exampl.test.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
This is my MainActivity3.java
package com.exampl.test;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity3 extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity3);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
This is my appmanifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exampl.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/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="com.exampl.test.MainActivity2"
android:label="#string/title_activity_main_activity2"
android:parentActivityName="com.exampl.test.MainActivity" >
</activity>
<activity
android:name="com.exampl.test.MainActivity3"
android:label="#string/title_activity_main_activity3"
android:parentActivityName="com.exampl.test.MainActivity2" >
</activity>
</application>
</manifest>
please help me wt to modify in above coding
Thanks in advance

Try This!
MainActivity
package com.example.acct;
import com.example.acct.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button =(Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity1", Toast.LENGTH_SHORT).show();
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity2();
}
});
}
public void activity2() {
Intent intent = new Intent(this, com.example.acct.MainActivity2.class);
startActivity(intent);
}
#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;
}
}
MainActivity2
package com.example.acct;
import com.example.acct.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity2 extends Activity {
Button button;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getActionBar().setDisplayHomeAsUpEnabled(true);
button = (Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity2", Toast.LENGTH_SHORT).show();
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity3();
}
});
}
public void activity3() {
Intent intent = new Intent(this, com.example.acct.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
MainActivity3
package com.example.acct;
import com.example.acct.R;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity3 extends Activity {
Button button;
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
Toast.makeText(this, "Activity3", Toast.LENGTH_SHORT).show();
getActionBar().setDisplayHomeAsUpEnabled(true);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
activity3();
}
});
}
public void activity3() {
Intent intent = new Intent(this, com.example.acct.MainActivity3.class);
startActivity(intent);
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.acct"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
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.acct.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=".MainActivity2"
android:parentActivityName=".MainActivity" >
</activity>
<activity
android:name=".MainActivity3"
android:parentActivityName=".MainActivity2" >
</activity>
</application>
</manifest>

how to start the app on power button press

I want to start my app when a user press the power button. I m following This code
but its not showing any Log and toast.
here is my complete code.
MyReceiver.java
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.v("onReceive", "Power button is pressed.");
Toast.makeText(context, "power button clicked", Toast.LENGTH_LONG)
.show();
// perform what you want here
}
}
menifest File
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.powerbuttontest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
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.example.powerbuttontest.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>
<receiver android:name=".MyReceiver" >
<intent-filter>
<action android:name="android.intent.action.SCREEN_OFF" >
</action>
<action android:name="android.intent.action.SCREEN_ON" >
</action>
<action android:name="android.intent.action.ACTION_POWER_CONNECTED" >
</action>
<action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" >
</action>
<action android:name="android.intent.action.ACTION_SHUTDOWN" >
</action>
</intent-filter>
</receiver>
</application>
</manifest>
MainActivity.java
package com.example.powerbuttontest;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
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;
}
}
I think i m committing a mistake in my menifest file. please have a look on this. thanks.

First, unlike other broad casted intents, for Intent.ACTION_SCREEN_OFF and Intent.ACTION_SCREEN_ON you CANNOT declare them in your Android Manifest! so You need to make a service which will keep on running like this
public static class UpdateService extends Service {
#Override
public void onCreate() {
super.onCreate();
// register receiver that handles screen on and screen off logic
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver mReceiver = new Receiver();
registerReceiver(mReceiver, filter);
}
#Override
public void onStart(Intent intent, int startId) {
boolean screenOn = intent.getBooleanExtra("screen_state", false);
if (!screenOn) {
// your code
} else {
// your code
}
}
}
and your receiver can be something
public class Receiver extends BroadcastReceiver {
private boolean screenOff;
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
screenOff = true;
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
screenOff = false;
}
Intent i = new Intent(context, UpdateService.class);
i.putExtra("screen_state", screenOff);
context.startService(i);
}
}

Here is my complete code. Hope this helps. I was basically making a look screen app. This will disable your default lock screen. and on power button press it will start a service and runs to look for power button press event.
Layout.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" >
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/toggleButton1"
android:layout_marginTop="72dp"
android:enabled="false"
android:text="Settings" />
<ToggleButton
android:id="#+id/toggleButton1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="72dp"
android:checked="true"
android:textOff="Disable"
android:textOn="Enable" />
</RelativeLayout>
MainActivity.java
package com.example.powerbuttontest;
import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
ToggleButton btnToggleLock;
Button btnMisc;
Toast toast;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnMisc = (Button) findViewById(R.id.button1);
btnToggleLock = (ToggleButton) findViewById(R.id.toggleButton1);
toast = Toast.makeText(getApplicationContext(), "", Toast.LENGTH_SHORT);
btnToggleLock.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (btnToggleLock.isChecked()) {
toast.cancel();
toast.setText("Unlocked");
toast.show();
Log.i("Unlocked", "If");
Context context = getApplicationContext();
KeyguardManager _guard = (KeyguardManager) context
.getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock _keyguardLock = _guard
.newKeyguardLock("KeyguardLockWrapper");
_keyguardLock.disableKeyguard();
MainActivity.this.startService(new Intent(
MainActivity.this, UpdateService.class));
} else {
toast.cancel();
toast.setText("Locked");
toast.show();
Context context = getApplicationContext();
KeyguardManager _guard = (KeyguardManager) context
.getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock _keyguardLock = _guard
.newKeyguardLock("KeyguardLockWrapper");
_keyguardLock.reenableKeyguard();
Log.i("Locked", "else");
MainActivity.this.stopService(new Intent(MainActivity.this,
UpdateService.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;
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
Log.i("onConfigurationChanged", "Called");
}
}
MyReciever.java
package com.example.powerbuttontest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
private boolean screenOff;
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
screenOff = true;
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
screenOff = false;
}
Intent i = new Intent(context, UpdateService.class);
i.putExtra("screen_state", screenOff);
context.startService(i);
}
}
UpdateService.java
package com.example.powerbuttontest;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class UpdateService extends Service {
BroadcastReceiver mReceiver;
#Override
public void onCreate() {
super.onCreate();
// register receiver that handles screen on and screen off logic
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
mReceiver = new MyReceiver();
registerReceiver(mReceiver, filter);
}
#Override
public void onDestroy() {
unregisterReceiver(mReceiver);
Log.i("onDestroy Reciever", "Called");
super.onDestroy();
}
#Override
public void onStart(Intent intent, int startId) {
boolean screenOn = intent.getBooleanExtra("screen_state", false);
if (!screenOn) {
Log.i("screenON", "Called");
Toast.makeText(getApplicationContext(), "Awake", Toast.LENGTH_LONG)
.show();
} else {
Log.i("screenOFF", "Called");
// Toast.makeText(getApplicationContext(), "Sleep",
// Toast.LENGTH_LONG)
// .show();
}
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
Menifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.powerbuttontest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<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>
<receiver android:name=".MyReceiver" />
<service android:name=".UpdateService" />
</application>
</manifest>

Here this one is the complete code, which will open your application as soon you presss power button. I am also doing the same project, where i want to open my Application directly after i press power button (turn on).
MainActivity.java
public class MainActivity extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_switch_power_offon);
startService(new Intent(getApplicationContext(), LockService.class));
}//EOF Oncreate
}//EOF Activity
LockService.java
public class LockService extends Service {
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
final BroadcastReceiver mReceiver = new ScreenReceiver();
registerReceiver(mReceiver, filter);
return super.onStartCommand(intent, flags, startId);
}
public class LocalBinder extends Binder
{
LockService getService() {
return LockService.this;
}
}//EOF SERVICE
ScreenReceiver.java
public class ScreenReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;
public void onReceive(final Context context, final Intent intent) {
Log.e("LOB","onReceive");
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
{
// do whatever you need to do here
wasScreenOn = false;
//Log.e("LOB","wasScreenOn"+wasScreenOn);
Log.e("Screen ","shutdown now");
}
else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
{
// and do whatever you need to do here
wasScreenOn = true;
Log.e("Screen ","awaked now");
Intent i = new Intent(context, MainActivity.class); //MyActivity can be anything which you want to start on bootup...
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT))
{
Log.e("LOB","userpresent");
// Log.e("LOB","wasScreenOn"+wasScreenOn);
}
}
}//EOF SCREENRECEIVER.JAVA
Now this is xml file, Please copy paste and just change the package name you are using
<?xml version="1.0" encoding="utf-8"?>
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.userpresent.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>
<service android:name="com.example.userpresent.LockService" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</service>
</application>

unable to send Broadcast from activity :android

hi friends i am unable to send Broadcast from one activity to other activity pls see my code below and help:
public class SendBroadcast extends Activity {
public static String BROADCAST_ACTION = "com.unitedcoders.android.broadcasttest.SHOWTOAST";
/* }
});
}
public void sendBroadcast(){
Intent broadcast = new Intent("com.unitedcoders.android.broadcasttest.SHOWTOAST");
this.sendBroadcast(broadcast);
//startActivity(broadcast);
}
}
Receiving side code:
public class ToastDisplay extends Activity {
private BroadcastReceiver mReceiver;
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.i("!!!!!!!InchooTutorial#######$$$$","%%%%%%% msg_for_me");
ent
// String msg_for_me = intent.getStringExtra("some_msg");
//log our message value
Log.i("!!!!!!!InchooTutorial#######$$$$","%%%%%%% msg_for_me");
}
};
//registering our receiver
this.registerReceiver(mReceiver, intentFilter);
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
//unregister our receiver
this.unregisterReceiver(this.mReceiver);
}
}
Manifest.xml is:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.unitedcoders.android.broadcasttest"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.BROADCAST_STICKY"/>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".SendBroadcast"
android:label="#string/app_name">
<intent-filter>
nitedcoders.android.broadcasttest.SHOWTOAST" />
</application> </manifest>

Since the other activity is not running when u send broadcast u wont receive it.
If u want to receive broadcasts even when the activity is not running . Declare it in xml .
Here is the code for you. I hope this is what you want.
package com.pdd.Receiver;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ReceiverActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button b=(Button) findViewById(R.id.button1);
b.setOnClickListener(this);
}
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i =new Intent("com.pdd.receiver.myaction");
sendBroadcast(i);
}
}
Receiver Class
package com.pdd.Receiver;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
//Intent i=new Intent(MyReceiver.class,Second.class);
Intent i=new Intent(arg0,Second.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
arg0.startActivity(i);
}
}
Second Activity to display Toast
package com.pdd.Receiver;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
public class Second extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Toast.makeText(getApplicationContext(), "This is second activity", 5000).show();
}
}
Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.pdd.Receiver"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<receiver android:name="com.pdd.Receiver.MyReceiver">
<intent-filter>
<action android:name="com.pdd.receiver.myaction"></action>
</intent-filter>
</receiver>
<activity
android:name=".ReceiverActivity"
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=".Second"></activity>
</application>
</manifest>

If your SendBroadcast activity is created the broadcast will be send.
Then you start the second activity called ToastDisplay and in the onResume you register the BroadcastReceiver. But this is to late, the broadcast was already send, it will not stay in the system!
Try sending a stickybroadcast like:
sendStickyBroadcast(Intent)
Or declare the broadcastreceiver in the manifest but then you need to create a seperate class that extends the BroadcastReceiver class, this cannot be inherreted.

Using two or more activty on Android

code below, don't know whats the problem
package and.views;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class androidView extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
menu.add(0,0, 0, "AutoComplete");
menu.add(0,1, 1, "Button");
menu.add(0,2, 2, "CheckBox");
menu.add(0,3, 3, "EditText");
menu.add(0,4, 4, "RadioGroup");
menu.add(0,5, 5, "Spinner");
return true;
}
/** Override onOptionsItemSelected to execute code for each menu item */
public boolean onOptionsItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case 0:
showAutoComplete();
return true;
case 1:
return true;
case 2:
return true;
case 3:
return true;
case 4:
return true;
case 5:
return true;
}
return true;
}
public void showAutoComplete()
{
Intent autocomplete = new Intent(this, AutoComplete.class);
try{
this.startActivity(autocomplete);
}
catch(Exception e)
{
System.out.print(" activity not found");
}
}
}
2nd class
package and.views;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
public class AutoComplete extends Activity{
public void onCreate(Bundle icircle) {
super.onCreate(icircle);
setContentView(R.layout.autocomplete);
ArrayAdapter<String> monthArray=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Months);
final AutoCompleteTextView textView= (AutoCompleteTextView)findViewById(R.id.testAutoComplete);
textView.setAdapter(monthArray);
final Button changeButton=(Button)findViewById(R.id.testAutoComplete);
changeButton.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v)
{
changeOption(textView);
}
});
final Button changeButton2 = (Button) findViewById(R.id.textColorButton);
changeButton2.setOnClickListener(new Button.OnClickListener()
{ public void onClick(View v)
{ changeOption2(textView);
}
});
}
static final String[]Months= new String[]{ "January","February","March","April","May","June","July","August", "September","October","November","December" };
public void changeOption(AutoCompleteTextView text)
{
if (text.getHeight()==100){ text.setHeight(30);
}
else
{
text.setHeight(100);
}
} public void changeOption2(AutoCompleteTextView text)
{
text.setTextColor(Color.RED);
}
}
Manifest file
enter code here<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="and.views"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".androidView"
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=".AutoComplete" android:label="AutoComplete" android:launchMode="standard" android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Chetan, I'm not quite sure what the exact problem you are having here, but I'm guessing you get a nullPointerException when you try to launch a new Activity? I didn't take an extensive look at your code but I noticed you don't have any of the extra Activities in your Manifest. Anytime you create a new Activity to be launched you need to add it to the Manifest. I'm pretty new to Android so I'm not too sure why all this is, but I came across that problem before as well.

Not too sure if the answer came too late for you.
Not much information about simple_list_item_1 online I can find, but if your problem is with the AutoCompleteTextView context popup not showing any of your prefilled autocomplete text, a change to simple_dropdown_item_1line should solve the problem
Note: I'm testing on API8

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.

how do i make an android application that run at the background? - android

#Override public void onBackPressed() { Intent i= new Intent(Intent.ACTION_MAIN); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); i.addCategory(Intent.CATEGORY_HOME); startActivity(i); or Intent i= new Intent(Intent.ACTION_ALL_APPS); startActivity(i); }

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broadCast Receiver is never called

simple navigation from 2nd activity to 3rd activity in android without passing any values

how to start the app on power button press

unable to send Broadcast from activity :android

Using two or more activty on Android

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