android:如何检查应用程序是否在后台运行 2

Question

我有解决方案。

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

return false;

它工作正常。

如何检查我的应用程序是否真的在后台运行？例如，我打开了 Activity 并启动了新的 Activity - 标准图库(从我的应用程序开始)。这个 Intent 是从我的 Activity 开始的，逻辑上我的应用程序在前台。我可以查看我的 Activity ，但是如何查看这种情况呢？

以及如何检查应用程序是否已从外部 Activity (在此示例中 - 画廊)发送到后台？

Answer 1

public boolean isApplicationSentToBackground(final Context context) {

  Boolean flag = false;
  ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
  if (Build.VERSION.SDK_INT >= 23) {
    List < ActivityManager.RunningTaskInfo > tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
      ComponentName topActivity = tasks.get(0).topActivity;
      if (!topActivity.getPackageName().equals(context.getPackageName())) {
        flag = true;
      }
    }
  } else {
    try {
      Thread.sleep(1500);
      flag = false;
      List < ActivityManager.RunningAppProcessInfo > runningProcesses = am.getRunningAppProcesses();
      for (ActivityManager.RunningAppProcessInfo processInfo: runningProcesses) {
        if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
          for (String activeProcess: processInfo.pkgList) {
            if (activeProcess.equals(context.getPackageName())) {
              flag = true;
            }
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  return flag;
}