android判断应用是否已经启动

 /**
 * 判断应用是否已经启动
 *
 * @param context     上下文对象
 * @param packageName 要判断应用的包名
 * @return boolean
 */
public static boolean isAppAlive(Context context, String packageName) {
    ActivityManager activityManager =
            (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningAppProcessInfo> processInfos
            = activityManager.getRunningAppProcesses();
    for (int i = 0; i < processInfos.size(); i++) {
        if (processInfos.get(i).processName.equals(packageName)) {
                return true;
        }
    }

    return false;
}