scheduling alarmmanager not working on reboot my phone

Question

It's toasting until I didn't restart my phone but after restarting broadcastreceiver2 doesn't receive and nothing happens.

I followed http://stacktips.com/tutorials/android/how-to-start-an-application-at-device-bootup-in-android and many other but nothing happens.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.k2.alarmmanagerdemo">
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="com.k2.alarmmanagerdemo.MyBroadcastReceiver"
            android:enabled="true">
        </receiver>
        <receiver android:name="com.k2.alarmmanagerdemo.BroadCastRecevier2"
            android:enabled="true"
            android:exported="true"
            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>

    </application>

</manifest>

MainActivity.java

public class MainActivity extends Activity {
    Button b1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1=(Button) findViewById(R.id.button1);

        b1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startAlert();
            }
        });
    }


    public void startAlert() {
        EditText text = (EditText) findViewById(R.id.time);
        int i = Integer.parseInt(text.getText().toString());
        Intent intent = new Intent(this, MyBroadcastReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
                this.getApplicationContext(), 234324243, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),
                1000 * 5,pendingIntent);
        Toast.makeText(this, "Alarm set in " + i + " seconds",Toast.LENGTH_LONG).show();
    }
}

MyBroadcastReceiver.java

public class MyBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        Toast.makeText(context, "Alarm...." + System.currentTimeMillis(), Toast.LENGTH_SHORT).show();
        Log.i("Alarm.", "alarm called" + System.currentTimeMillis());    

    }
}

BroadCastRecevier2.java

public class BroadCastRecevier2 extends BroadcastReceiver {

    MainActivity activity = new MainActivity();
    @Override
    public void onReceive(Context context, Intent intent) {


        activity.startAlert();
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            Intent i = new Intent();
            i.setClassName("com.k2.alarmmanagerdemo",
                    "com.k2.alarmmanagerdemo.MainActivity");
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(i);
            Toast.makeText(context, "BOOT", Toast.LENGTH_SHORT).show();
            Log.i("myboot","boot compleated inside");

        }
    }
}

Answer 1

Remove this line from your <receiver> declaration for BroadcastReceiver2:

android:permission="android.permission.RECEIVE_BOOT_COMPLETED"

That line in the <receiver> tag is telling the system that only packages which have this permission are allowed to send your class the Intent. Its' likely confusing the system and preventing the Intent from being sent to your receiver.

You may also find this article helpful when learning about alarms and the boot complete receiver.