Question

我需要检查我的应用程序是在后台运行还是在前台运行，然后相对于它执行一些操作。

我搜索了很多，没有明确的解决方案。

在onPause（）和onResume（）方法中创建一个父活动，保留一些变量来相应地更新它们。创建任何新活动时，都会继承父活动。虽然这是我实现任务的最佳解决方案，但有时即使应用程序在后台单击电源按钮，也会调用onResume（）。
使用GETTASKS权限 - 此解决方案也很好。但它只能用于调试目的。如果您想将自己的应用放在Google Play商店中，则不会。

对此有任何其他优选解决方案吗？

Answer 1

这解决了我的问题：

  private boolean isAppOnForeground(Context context,String appPackageName) {
    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
    if (appProcesses == null) {
        return false;
    }
    final String packageName = appPackageName;
    for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
        if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.processName.equals(packageName)) {
 //                Log.e("app",appPackageName);
            return true;
        }
    }
    return false;
}

Answer 2

原始答案：https://stackoverflow.com/a/60212452/10004454 按照Android文档的推荐方法是

class MyApplication : Application(), LifecycleObserver {

override fun onCreate() {
    super.onCreate()
    ProcessLifecycleOwner.get().lifecycle.addObserver(this);
}

fun isActivityVisible(): String {
    return ProcessLifecycleOwner.get().lifecycle.currentState.name
}

@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
fun onAppBackgrounded() {
    //App in background

    Log.e(TAG, "************* backgrounded")
    Log.e(TAG, "************* ${isActivityVisible()}")
}

@OnLifecycleEvent(Lifecycle.Event.ON_START)
fun onAppForegrounded() {

    Log.e(TAG, "************* foregrounded")
    Log.e(TAG, "************* ${isActivityVisible()}")
    // App in foreground
}}

在gradle（应用程序）中添加：implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"

然后在运行时调用MyApplication().isActivityVisible()

中检查状态

Answer 3

使用AppVisibilityDetector，我实现此类来检测应用可见性状态。它可以检测前台和后台状态并执行回调方法。

 AppVisibilityDetector.init(MyApp.this, new AppVisibilityCallback() {
    @Override
    public void onAppGotoForeground() {
        //app is from background to foreground
    }
    @Override
    public void onAppGotoBackground() {
        //app is from foreground to background
    }
});

MyApp是您的应用程序类

public class MyApp extends Application { ... }

您不需要为您的活动或AndroidManifest.xml中的任何权限添加其他代码

Answer 4

您可以使用此代码获取应用运行的前景（真实）状态

public boolean isAppForground(Context mContext) {
    ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(mContext.getPackageName())) {
            return false;
        }
    }
    return true;
}

Answer 5

使用以下函数检查您的应用程序是在Background还是Foreground

    public static Boolean getProcessState(Context mContext) {
    ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);

    boolean noProcessOnForeground = true;
    boolean isProcessForeground = false;

    System.out.println("Checking if process: " + mContext.getApplicationInfo().processName + " is Foreground or Background");
    List<ActivityManager.RunningAppProcessInfo> current_processes = am.getRunningAppProcesses();
    for (ActivityManager.RunningAppProcessInfo appProcess : current_processes) {
        if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {

            noProcessOnForeground = false;
            if ((mContext.getApplicationInfo().processName).equalsIgnoreCase(appProcess.processName)) {

                isProcessForeground = true;
                System.out.println("Process is Foreground");
                break;
                //   Toast.makeText(getApplicationContext(), "Process is Foreground", Toast.LENGTH_SHORT).show();
            } else {


                System.out.println("Process is Background");
                //    Toast.makeText(getApplicationContext(), "Process is Background", Toast.LENGTH_SHORT).show();
                isProcessForeground = false;
                break;
            }
        }
    }

    if (noProcessOnForeground) {

        System.out.println("there is no process on foreground so setting " + mContext.getApplicationInfo().processName + " as background");
        isProcessForeground = false;
    }

    return isProcessForeground;
}

Answer 6

只想在Activity / Fragment中使用以下代码：

final boolean isAlive = AppVisibilityHelper.isForeground(HomeActivity.this);

想要制作如下所示的课程：

 public class AppVisibilityHelper{

        public static boolean isForeground(final Context context) {
            final String packageName = "com.acb.android";
            ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            List<ActivityManager.RunningTaskInfo> runningTaskInfo = manager.getRunningTasks(1);
            ComponentName componentInfo = runningTaskInfo.get(0).topActivity;
            return componentInfo.getPackageName().equals(packageName);
        }
    }

如果您想在每一秒后检查一次，请在活动中使用以下代码：

 Runnable CheckAppIsRunning = new Runnable() {
        @Override
        public void run() {
           final boolean isAlive = AppVisibilityHelper.isForeground(HomeActivity.this);
                if (isAlive) {
                    // App is running
                } else {
                    // App is not running
                }
            }
            appIsRuningHandler.postDelayed(CheckAppIsRunning, 1000);
        }
    };

在onCreate（）中只需调用一次：

appIsRuningHandler.postDelayed(CheckAppIsRunning, 1000);

Answer 7

检查应用是否处于forground状态或背景状态

ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
   List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();

   final String packageName = getPackageName();
    for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses)
   {

   if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND && appProcess.processName.equals(packageName))
      {

       //if app in background state this will execute

        Intent intent = getPackageManager().getLaunchIntentForPackage("hinditextonphoto.com.allcomponents");
        startActivity(intent);
        System.out.println("bbbbbbbbbbbbb    background");
      }

       else if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.processName.equals(packageName))
       {

       //if app in forground state this will execute
         System.out.println("bbbbbbbbbbbbb    forground");

       }

  }

如何知道我的应用程序是在前台还是后台，android？

7 个答案: