This tutorial will explain to stat an application while the Android device boot-up. For this we need to  listen to the BOOT_COMPLETED action and react to it. BOOT_COMPLETED is a Broadcast Action that is broadcast once, after the system has finished booting. You can listen to this action by creating a BroadcastReceiver that then starts your launch Activity when it receives an intent with the BOOT_COMPLETED action.

1. Add this permission to your manifest:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

2. Create a Custom BroadcastReceiver in your project to receive boot up event

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class BootReceiver extends BroadcastReceiver{

	@Override
	public void onReceive(Context context, Intent intent) {
		Intent i = new Intent(context, MainActivity.class);  
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);  
	}
}

3. Adding the BroadCastReceiver to the Android Manifest

<receiver
android:name=".BootReceiver"
android:enabled="true"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>

Install the application, and then restart the device. You can see the application will start after the device restarts.