how to start the app on power button press

Question

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.

Answer 1

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

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