android app程序运行状态的判定

/**
 * 返回app运行状态
 * 1:程序在前台运行
 * 2:程序在后台运行
 * 3:程序未启动
 * 注意：需要配置权限<uses-permission android:name="android.permission.GET_TASKS" />
 */
public int getAppSatus(Context context, String pageName) {

    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(20);

    //判断程序是否在栈顶
    if (list.get(0).topActivity.getPackageName().equals(pageName)) {
        return 1;
    } else {
        //判断程序是否在栈里
        for (ActivityManager.RunningTaskInfo info : list) {
            if (info.topActivity.getPackageName().equals(pageName)) {
                return 2;
            }
        }
        return 3;//栈里找不到，返回3
    }
}

还可以通过下面代码判断程序的某个页面是否在运行

info.topActivity.getClassName().equals(activityName)

KeyguardManager km = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
if (km.inKeyguardRestrictedInputMode()) {//如果锁屏就解锁
    KeyguardManager.KeyguardLock keyguardLock = km.newKeyguardLock("");
    keyguardLock.disableKeyguard();
}