Warum funktioniert der BroadcastReceiver nicht?

Question

Ich habe eine Aktivität und einen Service. Im Dienst habe ich einen BroadcastReceiver, wo ich eine Nachricht ausgeben möchte. Warum wird die Nachricht nicht angezeigt, wenn ich diesen Dienst starte?

Aktivität:

public class MainActivity extends AppCompatActivity 
{ 
private Button button_sel; //adaugat 

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    checkLicenta(); //adaugat 

    // adaugat 
    findViewById(R.id.button).setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     public void onClick(View v) 
     { 
      Intent intent = new Intent(MainActivity.this, MainService.class); 
      startService(intent); 
      Toast.makeText(MainActivity.this, "Service, Running", Toast.LENGTH_SHORT).show(); 
     } 
    }); //pana aici 

    // adaugat 
    findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     public void onClick(View v) 
     { 
      Intent intent = new Intent(MainActivity.this, MainService.class); 
      stopService(intent); 
      Toast.makeText(MainActivity.this, "Service, Stopped", Toast.LENGTH_SHORT).show(); 
     } 
    }); //pana aici 
} 

} 

Service:

public class MainService extends Service 
{ 
private static final String TAG = "HelloService"; 

private boolean isRunning = false; 

@Override 
public void onCreate() 
{ 
    registerReceiver(counter, new IntentFilter(Intent.ACTION_SCREEN_ON)); 
    Log.i(TAG, "Service, onCreate"); 
    Toast.makeText(MainService.this, "Service, Created", Toast.LENGTH_SHORT).show(); 
    isRunning = true; 
} 

private BroadcastReceiver counter = new BroadcastReceiver() 
{ 
    @Override 
    public void onReceive(Context context, Intent intent) 
    { 
     Toast.makeText(MainService.this, "LALALA", Toast.LENGTH_SHORT).show(); 
    } 
}; 

@Override 
public int onStartCommand(Intent intent, int flags, int startId) 
{ 
    Log.i(TAG, "Service, onStartCommand"); 
    Toast.makeText(MainService.this, "Service, Started", Toast.LENGTH_SHORT).show(); 
    return super.onStartCommand(intent, flags, startId); 
} 

@Override 
public void onDestroy() 
{ 
    Log.i(TAG, "Service, onDestroy"); 
    Toast.makeText(MainService.this, "Service, Destroyed", Toast.LENGTH_SHORT).show(); 
    isRunning = false; 
} 

@Override 
public IBinder onBind(Intent intent) 
{ 
    Log.i(TAG, "Service, onBind"); 
    return null; 
} 
} 

UPDATE: die Nachricht wird tatsächlich kommen, wenn Sie auf dem Bildschirm drehen, weil der ACTION_SCREEN_ON.

Answer 1

Ihr Code funktioniert gut, hat erklären Sie Ihren Dienst in der AndroidManifest?

<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> 
     <service 
     android:name="com.example.test.MainService" 
     android:exported="true" > 
      <intent-filter> 
      <action android:name="com.example.test.MainService" /> 

      <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </service> 
</application> 

Answer 2

Zuerst müssen Sie Ihre Übertragung in Android Manifest-Datei registrieren. Siehe unten stehende code.`public Klasse MyBroadcastReceiver erstreckt BroadcastReceiver {

@Override 
public void onReceive(Context context, Intent intent) 
{ 
    Toast.makeText(context,"Your Alarm",Toast.LENGTH_SHORT).show(); 
    Vibrator vibrator= (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); 
    vibrator.vibrate(2000); 
} 

}

public class MainActivity erweitert AppCompatActivity {

EditText editText; 
Button btn1; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    editText= (EditText) findViewById(R.id.edttext1); 
    btn1= (Button) findViewById(R.id.btn1); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    btn1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      int i= Integer.parseInt(editText.getText().toString()); 
      Intent intent=new Intent(MainActivity.this,MyBroadcastReceiver.class); 
      PendingIntent pendingIntent=PendingIntent.getBroadcast(MainActivity.this.getApplicationContext(),2,intent,0); 
      AlarmManager alarmManager= (AlarmManager) getSystemService(ALARM_SERVICE); 
      alarmManager.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+i*5000,pendingIntent); 
      Toast.makeText(MainActivity.this,"Alarm Set",Toast.LENGTH_SHORT).show(); 
     } 
    }); 
} 

}

Android Manifest-Datei.

<uses-permission android:name="android.permission.VIBRATE"/> 
<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    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=".MyBroadcastReceiver"> 
    <intent-filter> 
     <action android:name="com.example.admin.broadcastreceiverdemo"> 
     </action> 
    </intent-filter> 

    </receiver> 
</application>