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

<receiver
android:enabled="true"
android:exported="true"
android:name="yourpackage.BootReceiver"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">

<intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
    <action android:name="android.intent.action.QUICKBOOT_POWERON" />
    <category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>

public class yourActivityRunOnStartup extends BroadcastReceiver {

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