按照例子写的闹铃没有反应

 AlarmManager aManager = (AlarmManager) mcontext.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent("MYALARMRECEIVER");
        intent.putExtra("msg","提醒时间到了");
        PendingIntent pi = PendingIntent.getBroadcast(mcontext,0,intent,0);
        Date date=new Date(System.currentTimeMillis());
        long time1=date.getTime();
        Log.d("555555555558888",String.valueOf(time1));
        aManager.setRepeating(AlarmManager.RTC_WAKEUP, time1,600*1000,pi);




 public class MyReceiver extends BroadcastReceiver{

    public void onReceive(Context context, Intent intent){
        String msg = intent.getStringExtra("msg");
        Toast.makeText(context,msg, Toast.LENGTH_SHORT).show();
        Log.d("5555555","闹钟响了");
    }
}

<?xml version="1.0" encoding="utf-8"?>
package="com.example.zou.ti">

<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"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".CreatEvent">
    </activity>
    <receiver android:name=".MyReceiver">
        <intent-filter>
            <action android:name="MYALARMRECEIVER" />
        </intent-filter>
    </receiver>
</application>

会不会是权限问题呢,在清单文件中 添加权限 com.android.alarm.permission.SET_ALARM