activity app是否在最前端

protected static boolean isTopActivity(Activity activity) {

String myPacket = activity.getPackageName();

String packageName = myPacket ;// "com.example.testant";

ActivityManager activityManager = (ActivityManager) activity

.getSystemService(Context.ACTIVITY_SERVICE);

List<RunningTaskInfo> tasksInfo = activityManager.getRunningTasks(1);

if (tasksInfo.size() > 0) {

String topPacketName = tasksInfo.get(0).topActivity

.getPackageName();

Log.d("istop", "topPacketName==" + topPacketName);

// 应用程序位于堆栈的顶层

if (packageName.equals(topPacketName)) {

return true;

}

}

return false;

}

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

public static boolean isApplicationShowing(String packageName,

Context context) {

boolean result = false;

ActivityManager am = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

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

if (appProcesses != null) {

for (RunningAppProcessInfo runningAppProcessInfo : appProcesses) {

if (runningAppProcessInfo.processName.equals(packageName)) {

int status = runningAppProcessInfo.importance;

if (status == RunningAppProcessInfo.IMPORTANCE_VISIBLE

|| status == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {

result = true;

break;

}

}

}

}

return result;

}