1、通过RunningTaskInfo类判断（需要额外权限）：

复制代码 代码如下:

/**

*判断当前应用程序处于前台还是后台

*/

public static boolean isApplicationBroughtToBackground(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;

}

需要在AndroidMenitfest.xml文件中添加以下权限

复制代码 代码如下:

<uses-permission android:name="android.permission.GET_TASKS" />

2、通过RunningAppProcessInfo类判断（不需要额外权限）：

复制代码 代码如下:

public static boolean isBackground(Context context) {

ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();

for (RunningAppProcessInfo appProcess : appProcesses) {

if (appProcess.processName.equals(context.getPackageName())) {

if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {

Log.i("后台", appProcess.processName);

return true;

}else{

Log.i("前台", appProcess.processName);

return false;

}

}

}

return false;

}