我已经为此苦苦挣扎了几个小时。我还检查了文档和几个主题。我在两个主题中找到了这段代码,两个人都说代码运行良好,但在我的电脑上却不行。第一个 Toast 出现,但第二个从不出现。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();
}
}
最佳答案
实际上您不需要指定操作,因为您使用类 AlarmReceiver.class
在 Intent 中。
在你的AndroidManifest.xml
, 请确保您在 <application>
中有一个接收器定义标签,比如:
<receiver android:name="AlarmReceiver">
编辑: 好的,有 2 种方法可以使用您的广播接收器。
1) 根据您提供的代码,AlarmReceiver.java
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();
}
}
和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,您可以将您的广播接收器设置为与AndroidManifest.xml
一起工作。和标签 <receiver ...>
2) 第二种方式。通过这种方式,您可以只使用 1 个文件 HelloWorld2.java
:
在您的 Activity 中,创建您的广播接收器并注册它。
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();
}
关于安卓闹钟不工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4660823/