Android闹钟不起作用

Question

几个小时以来我一直在努力.我还检查了文档和几个主题.我发现这个代码有两个主题,两个人都说代码工作正常,但不能在我的电脑上运行.第一个Toast出现了,但第二个Toast出现了.怎么了？

public class HelloAndroid2 extends Activity {  


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);   

    Intent intent = new Intent(this, AlarmReceiver.class);

    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
    intent, PendingIntent.FLAG_ONE_SHOT);

    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (10 * 1000), pendingIntent);
    Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

}

 public final class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "Alarm worked.", Toast.LENGTH_LONG).show();

    }
 }

}

Answer 1

实际上,您不需要指定操作,因为您AlarmReceiver.class在intent中使用了类.

在你的AndroidManifest.xml,确保你在<application>标签中有一个接收器定义,如:

<receiver android:name="AlarmReceiver">

编辑:确定有两种方法可以使用您的广播接收器.

1)从您提供的代码中AlarmReceiver.java,它将包含:

public final class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "Alarm worked.", Toast.LENGTH_LONG).show();

    }
 }

并且HelloAndroid2.java:

public class HelloAndroid2 extends Activity {  


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);   

    Intent intent = new Intent(this, AlarmReceiver.class);

    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
    intent, PendingIntent.FLAG_ONE_SHOT);

    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (10 * 1000), pendingIntent);
    Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

}

}

像这样,您可以将广播接收器设置为使用AndroidManifest.xml和标签<receiver ...>

2)第二路.通过这种方式,您只需使用1个文件HelloWorld2.java:

在您的活动中,创建您的广播接收器并进行注册.

public class HelloWorld2 extends Activity {
    private SharedPreferences prefs;
    private String mName;


    BroadcastReceiver alarmReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "Alarm worked", Toast.LENGTH_LONG).show();          
        }
    };


    public static final String ACTION_NAME = "com.helloworld.MYACTION";
    private IntentFilter myFilter = new IntentFilter(ACTION_NAME);


    @Override
    protected void onPause() {
        unregisterReceiver(alarmReceiver);
        super.onPause();
    }

    @Override
    protected void onResume() {
        registerReceiver(alarmReceiver, myFilter);
        super.onResume();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        registerReceiver(alarmReceiver, myFilter);

        Intent intent = new Intent(ACTION_NAME);        

        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
        intent, PendingIntent.FLAG_ONE_SHOT);

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (10 * 1000), pendingIntent);
        Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();


    }

Answer 2

我遇到了同样的问题,直到我发现我的广播接收器放在不同的包装上,而不是一般的.

简单改变:

<receiver android:name=".AndroidAlarmService" android:enabled="true" >

对于:

<receiver android:name="com.MyCompany.MyPackage.AndroidAlarmService" android:enabled="true" >