计划的警报管理器无法正常工作 Android

Question

我正在尝试启动每天在特定时间重复的警报服务。关于这个，我已经经历了很多关于堆栈溢出的线程，但没有运气。我遵循了一些教程：http://karanbalkar.com/2013/07/tutorial-41-using-alarmmanager-and-broadcastreceiver-in-android/ 和 http://javatechig.com/android/repeat-alarm-example-in-android

我的服务从未启动，我不明白为什么。以下是我的代码：

我的清单文件：

     <uses-sdk
            android:minSdkVersion="8"
            android:targetSdkVersion="17" />

        <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
        <uses-permission android:name="android.permission.WAKE_LOCK" />
        <uses-permission android:name="android.permission.CAMERA" />
        <uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
<application>
        <service android:name="com.paper.DownloadService" android:enabled="true"/>
                  <receiver android:name="com.paper.MyReceiver" ></receiver>
</application>

我的接收类：

public class MyReceiver extends BroadcastReceiver
{      
    @Override
    public void onReceive(Context rcontext, Intent intent)
    {
        Log.e("Main Activity", "inside on receive of myreceiver");
       Intent service1 = new Intent(rcontext, DownloadService.class);
       rcontext.startService(service1);

    }   
}

我的服务等级：

 public class DownloadService extends Service {
    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        Log.e("Download Service", "CREATED");
    }   
    @SuppressLint({ "SimpleDateFormat", "NewApi" }) @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub

        Log.e("Download Service", "STARTED");
        return START_NOT_STICKY;
    }
 }

我的主要活动（在创建方法内部）：

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

            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 15);
            calendar.set(Calendar.MINUTE, 29);

             Intent myIntent = new Intent(this, MyReceiver.class);
             pendingIntent = PendingIntent.getBroadcast(this, 0, myIntent,0);

             alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                     AlarmManager.INTERVAL_DAY, pendingIntent);

在这里，我尝试在每天下午 3:29 设置闹钟，但该服务在那个时间或任何时间都没有启动。任何帮助，将不胜感激。谢谢！

Answer 1

这是我为使其正常工作所做的：

1) 在我的清单文件中添加了<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>。

2) 将我的主要活动中的代码更改为：

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

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR, 3);
        calendar.set(Calendar.MINUTE, 29);
        calendar.set(Calendar.AM_PM, Calendar.PM);

         Intent myIntent = new Intent(this, MyReceiver.class);
         pendingIntent = PendingIntent.getBroadcast(this, 0, myIntent,0);

         alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                 AlarmManager.INTERVAL_DAY, pendingIntent);

希望有人觉得这有帮助！

Answer 2

主要活动

public class MainActivity extends AppCompatActivity {
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Intent intent = new Intent(this, MyBroadcastReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
                + (60 * 1000), pendingIntent); // 60 seconds after the current time
    }
}

报警接收器

public class MyBroadcastReceiver extends BroadcastReceiver {

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

        
        Log.e("Testing","ok");

    }

}

清单文件

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.testapp">
    
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-permission android:name="android.permission.WAKE_LOCK" />
        <uses-permission android:name="android.permission.VIBRATE" />
        <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
        <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
    
        <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">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
          
           <receiver android:name=".MyBroadcastReceiver" 
              android:enabled="true" />
        </application>
    
    </manifest>

对于后台工作，将其添加到主要活动中（如果应用程序删除到最近）

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            Intent intent = new Intent();
            String packageName = getPackageName();
            PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
            if (!pm.isIgnoringBatteryOptimizations(packageName)) {
                intent.setAction(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
                intent.setData(Uri.parse("package:" + packageName));
                startActivity(intent);
            }
        }