android 判断当前application 是在前台还是在后台

/**
*判断当前应用程序处于前台还是后台
*
* @param context

* @return

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：

/**
*
* @param context
* @return
*/
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;
}

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