安卓判断APP是在前台还是在后台

安卓中判断APP是否在前台：

方法一：CCApplication 中判断

private boolean mIsInForeground = false;

public boolean isInForeground() {
    return mIsInForeground;
}

private class CCActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {

    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
    }

    @Override
    public void onActivityStarted(Activity activity) {
        MonkeyLog.d(TAG, "onActivityStarted :" + activity);
    }

    @Override
    public void onActivityResumed(Activity activity) {
        mIsInForeground = true;//APP在前端
        Adjust.onResume();
        setCurrentActivity(activity);
    }

    @Override
    public void onActivityPaused(Activity activity) {
        mIsInForeground = false;//APP 在后台
        Adjust.onPause();
        setCurrentActivity(null);
    }

    @Override
    public void onActivityStopped(Activity activity) {

    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {

    }

    @Override
    public void onActivityDestroyed(Activity activity) {

    }
}

在APPlication的onCreate()方法中：

registerActivityLifecycleCallbacks(new CCActivityLifecycleCallbacks());

使用的时候直接判断：

if (!CCApplication.getInstance().isInForeground()) {
   //ToDo
}

方法二：

在BaseActivity中

// 当前app是否是前台状态
private static boolean isActive = false;

在BaseActivity 的onResume()方法中：

@Override
protected void onResume() {
    super.onResume();
    if (!isActive) {
        //app 从后台唤醒，进入前台
        isActive = true;
    }
}

在onStop()方法中：

@Override
protected void onStop() {
    super.onStop();
    if (!isAppOnForeground()) {
        //app 进入后台
        isActive = false；
    }
}

/**
 * 程序是否在前台运行
 *
 * @return
 */
private boolean isAppOnForeground() {
    // Returns a list of application processes that are running on the device

    ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
    String packageName = getApplicationContext().getPackageName();

    List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager
            .getRunningAppProcesses();
    if (appProcesses == null)
        return false;

    for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
        // The name of the process that this object is associated with.
        if (appProcess.processName.equals(packageName)
                && appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
            return true;
        }
    }

    return false;
}

这样就可以判断APP是在前台还是在后台了

常用的地方是当接收到Notification消息时，当APP在前端直接处理消息当APP在后台时将Notification消息显示在手机的消息栏中

个人GitHub地址：https://github.com/HuaDanJson

安卓判断APP是在前台还是在后台

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