Question

我想每天在特定时间设置墙纸，为此，我在android中使用AlarmManager调用设置墙纸功能。这是我设置“警报”以更改墙纸的代码。

 public void setTime() {
        alarmMgr = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(this, reciveBrodcast.class);
        alarmIntent = PendingIntent.getBroadcast(this, 0, intent, 0);


        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 14);
        calendar.set(Calendar.MINUTE, 40);


        alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                AlarmManager.INTERVAL_DAY, alarmIntent);
    }

并且我正在MainActivity.class的onCreate（）函数中初始化此函数：

  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTime();
        }

setTime函数启动了一个reciveBrodcast.class，我正在像这样调用setWallpaper函数：

public class reciveBrodcast extends BroadcastReceiver  {
    quotePresenter presenter =new quotePresenter();
    @Override
    public void onReceive(Context context, Intent intent) {

        presenter.downloadTaskIn();

    }

这里的主持人是一个具有downloadTaskIn（）来设置墙纸的类。但是此代码不起作用，当我尝试使用“打开”按钮时，此功能将起作用。请帮助我如何在特定时间调用此事件。

我的清单：

  <receiver android:name=".View.reciveBrodcast" android:process=":remote" />
       <activity android:name=".View.MainActivity">

Answer 1

请尝试以下代码。

Class助手来设置警报。

public class AlarmSetter {

    private final String TAG = "AlarmSetter";
    private final int REQUEST_CODE = 9587;
    private Context context;

    public AlarmSetter(Context context) {

        this.context = context;
    }

    public void setAlarm() {

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

        if (alarmManager == null) {

            Log.e(TAG, "ALARM_SERVICE was null :(");

            return;
        }

        Intent intent = new Intent(context, BRWallpaperChanger.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, REQUEST_CODE, intent, 0);

        cancelPreviousAlarm(alarmManager, pendingIntent);

        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 14);
        calendar.set(Calendar.MINUTE, 40);
        calendar.set(Calendar.SECOND, 0);

        long when;

        if (System.currentTimeMillis() <= calendar.getTimeInMillis()) {

            when = calendar.getTimeInMillis();

        } else {

            when = calendar.getTimeInMillis() + 86400 * 1000; // Add one day in exact time
        }

        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {

            alarmManager.set(AlarmManager.RTC_WAKEUP, when, pendingIntent);

        } else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {

            alarmManager.setExact(AlarmManager.RTC_WAKEUP, when, pendingIntent);

        } else {

            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, when, pendingIntent);
        }

        Log.d(TAG, "Next trigger set for at " + new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(when));
    }

    private void cancelPreviousAlarm(AlarmManager alarmManager, PendingIntent pendingIntent) {

        alarmManager.cancel(pendingIntent);
    }

}

现在进入您onCreate()中的MainActivity

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

    AlarmSetter alarmSetter = new AlarmSetter(context);
    alarmSetter.setAlarm();
}

您的BroadcastReceiver用于设置壁纸。

public class BRWallpaperChanger extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        // Set Alarm for next time...

        AlarmSetter alarmSetter = new AlarmSetter(context);
        alarmSetter.setAlarm();

        // Change wallpaper here...
    }
}

在您的AndroidMenifest.xml

<receiver
    android:name=".BRWallpaperChanger"
    android:enabled="true"
    android:exported="false" />

请让我知道代码是否有效。

AlarmManager在特定时间未执行任务

1 个答案: