应用程序未在后台运行（Android Studio Java）

huangapple
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英文:

App is not running in Background (Android Studio java)

问题

以下是你要翻译的内容：

我正在开发一个 Android 应用程序，我想要激活每日闹钟（我只是用 5 分钟间隔作为示例进行测试）。

我使用了一个广播接收器（在清单文件中声明的静态接收器），但是应用程序仍然无法正常工作。以下是我的代码：

清单文件：

  1. <receiver android:name=".ExecutableService" android:enabled="true"></receiver>

AlarmHandler 类：

  1. public class AlarmHandler {
  2.     private Context context;
  4.     public AlarmHandler(Context context) {
  5.         this.context = context;
  6.     }
  8.     // 这将激活闹钟
  9.     public void setAlarmManager() {
  10.         Intent intent = new Intent(context, ExecutableService.class);
  11.         PendingIntent sender = PendingIntent.getBroadcast(context, 2, intent, 0);
  12.         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
  13.         if (alarmManager != null) {
  14.             long triggerAfter = 60 * 5 * 1000; // 这将在 5 分钟后触发服务
  15.             long triggerEvery = 60 * 5 * 1000; // 这将在之后的每 5 分钟重复触发闹钟
  16.             alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, triggerAfter, triggerEvery, sender);
  17.         }
  18.     }
  20.     // 这将取消闹钟
  21.     public void cancelAlarm() {
  22.         Intent intent = new Intent(context, ExecutableService.class);
  23.         PendingIntent sender = PendingIntent.getBroadcast(context, 2, intent, 0);
  24.         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
  25.         if (alarmManager != null) {
  26.             alarmManager.cancel(sender);
  27.         }
  28.     }
  29. }

这是广播接收器：

  1. import ...
  2. public class ExecutableService extends BroadcastReceiver {
  3.     private static final String TAG = "Executable Service";
  5.     @Override
  6.     public void onReceive(Context context, Intent intent) {
  7.         // 这将在选定的间隔执行，显示通知
  8.         Toast.makeText(context, "Hello World 2!", Toast.LENGTH_SHORT).show();
  9.         Log.d(TAG, "onReceive: it worked");
  10.         Vibrator v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
  11.         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
  12.             v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
  13.         } else {
  14.             // 在 API 26 中已弃用
  15.             v.vibrate(500);
  16.         }
  17.     }
  18. }

这是 MainActivity，在这里我激活闹钟：

  1. public class MainActivity2 extends AppCompatActivity {
  3.     @Override
  4.     protected void onCreate(Bundle savedInstanceState) {
  5.         super.onCreate(savedInstanceState);
  6.         setContentView(R.layout.activity_main2);
  7.         AlarmHandler alarmHandler = new AlarmHandler(this);
  8.         // 取消先前安排的闹钟
  9.         alarmHandler.cancelAlarm();
  10.         // 在一小时后设置新闹钟
  11.         alarmHandler.setAlarmManager();
  12.         Toast.makeText(this, "Alarm Set!", Toast.LENGTH_SHORT).show();
  13.     }
  14. }

如果这不是在后台运行应用程序并在特定时间推送通知（或在特定时间显示简单提示）的正确方法，那么最佳方法是什么？我还尝试过作业调度服务。

英文:

I am working on an Android app and I want to activate a daily Alarm (I used 5 min interval just as an example to test).

I used a Brodacast receiver (Static one declared in the manifest file),
but the app still doesn't work. Here's my code:

The Manifest file:

  1. &lt;/activity&gt; &lt;receiver android:name=&quot;.ExecutableService&quot; android:enabled=&quot;true&quot; &gt;&lt;/receiver &lt;/application&gt;

The AlarmHandler class:

  1. public class AlarmHandler  {
  2.     private Context context;
  4.     public AlarmHandler(Context context) {
  5.         this.context = context;
  6.     }
  7.     //This will active the alarm
  8.     public void setAlarmManager(){
  9.         Intent intent = new Intent(context,ExecutableService.class);
  10.         PendingIntent sender  = PendingIntent.getBroadcast(context ,2,intent,0);
  11.         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
  12.         if (alarmManager != null) {
  13.             long triggerAfter=60*5*1000;//this will trigger the service after 5 min
  14.             long triggerEvery=60*5*1000;//this will repeat alarm every 5 min after that
  15.             alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,triggerAfter,triggerEvery,sender);
  16.         }
  17.     }
  18.     //This will cancel the alarm
  19.     public void cancelAlarm (){
  20.         Intent intent = new Intent(context,ExecutableService.class);
  21.         PendingIntent sender = PendingIntent.getBroadcast(context,2,intent,0);
  22.         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
  23.         if (alarmManager != null) {
  24.             alarmManager.cancel(sender);
  25.         }
  26.     }
  27. }

This is the Broadcast receiver:

  1.  import ...
  2. public class ExecutableService extends BroadcastReceiver {
  3. private static final String TAG=&quot;Executable Service&quot;;
  4. @Override
  5. public void onReceive(Context context, Intent intent) {
  6.     //this will be executed at selected interval  Notification show
  7.     Toast.makeText(context, &quot;Hello World 2! &quot;, Toast.LENGTH_SHORT).show();
  8.     Log.d(TAG, &quot;onReceive: it worked &quot;);
  9.     Vibrator v=(Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
  10.     if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.O) {
  11.         v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
  12.     } else {
  13.         //deprecated in API 26
  14.         v.vibrate(500);
  15.     }}}

And this is the MainActivty where I activate the alarm:

  1. public class MainActivity2 extends AppCompatActivity {
  3.     @Override
  4.     protected void onCreate(Bundle savedInstanceState) {
  5.         super.onCreate(savedInstanceState);
  6.         setContentView(R.layout.activity_main2);
  7.         AlarmHandler alarmHandler = new AlarmHandler(this);
  8.         //cancel the previous scheduled alarm
  9.         alarmHandler.cancelAlarm();
  10.         //set the new alarm after one hour
  11.         alarmHandler.setAlarmManager();
  12.         Toast.makeText(this, &quot;Alarm Set ! &quot;, Toast.LENGTH_SHORT).show();
  13.     }

If this is not the way that I should use to run the app in the background and push a notification (or a simple toast at a specific time), what is the best way to do it?

I tried also jobscheduler services.

答案1

得分: 1

你将闹钟的开始时间设置为long triggerAfter=60*5*1000;我建议将其更改为long triggerAfter =60*5*1000+ System.currentTimeMillis()。

英文:

you set the alarm start time to long triggerAfter=60*5*1000;
I suggest changing this to
long triggerAfter =60*5*1000+ System.currentTimeMillis()

huangapple
  • 本文由 发表于 2020年8月25日 21:31:32
  • 转载请务必保留本文链接：https://go.coder-hub.com/63580008.html
  • alarm
  • android
  • java
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