android 判断当前application 是在前台还是在后台

android 判断当前application 是在前台还是在后台

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

}

上面这段代码是需要一个权限的：



下面这段代码是我最新发现，无需权限，妥妥滴：


public static boolean isBackground(Context context) {

ActivityManager activityManager = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List appProcesses = activityManager
.getRunningAppProcesses();
for (RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.processName.equals(context.getPackageName())) {
if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
Log.i(String.format("Background App:", appProcess.processName));
return true;
}else{
Log.i(String.format("Foreground App:", appProcess.processName));
return false;
}
}
}
return false;
}

 public static boolean isapplicationbroughttobackground(final context context) {   activitymanager am = (activitymanager) context.getsystemservice(context.activity_service);   list tasks = am.getrunningtasks(1);   if (!tasks.isempty()) {    componentname topactivity = tasks.get(0).topactivity;    if (!topactivity.getpackagename().equals(context.getpackagename())) {     return true;    }   }   return false;  }上面这段代码是需要一个权限的： < uses-permission android:name=”android.permission.get_tasks” />