问题描述
我正在尝试将广播接收器与警报管理器一起使用,但不幸的是它在我的手机上不起作用(android 10)。广播接收器不会初始化。如果有人帮助我,我会感谢他/她
broadcastReceiver 类
`public class Alarm extends broadcastReceiver {
@Override
public void onReceive(Context context,Intent intent) {
Toast.makeText(context,"Wake up",Toast.LENGTH_LONG).show();
Log.i("fffffgggg","onReceive: reached broadcast");
MediaPlayer mediaPlayer=MediaPlayer.create(context,Settings.System.DEFAULT_ringtone_URI);
mediaPlayer.start();
}`
接收方清单
<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=".Alarm" android:exported="true" android:enabled="true">
</receiver>
</application>
MainActivity 类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent notifyintent = new Intent(MainActivity.this,Alarm.class);
PendingIntent pIntent = PendingIntent.getbroadcast(MainActivity.this,notifyintent,0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
//update 30 seconds
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),30*1000,pIntent);
}
解决方法
您需要决定操作(一些字符串),配置您的广播接收器以处理该操作,并创建一个触发该操作的待处理意图。
事情是这样的。
清单:
<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=".Alarm" android:exported="true" android:enabled="true">
<intent-filter>
<action android:name="MY_ACTION" />
</intent-filter>
</receiver>
</application>
主要活动:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent notifyintent = new Intent("MY_ACTION");
PendingIntent pIntent = PendingIntent.getBroadcast(MainActivity.this,notifyintent,0);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
//update 30 seconds
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),30*1000,pIntent);
}
另外,建议确保您在 onReceive
函数中执行了正确的操作。
AlarmManager 使用 Pending Intent 作为基础。 Pending Intent 它是一个意图修改,因此首先您必须在清单中定义操作,并将该值赋予 Pending Intent。有关更多详细信息,您可以阅读警报管理器 google 文档,希望对我有所帮助。