Question

我需要从服务中检测系统ui可见性（全屏）。我尝试创建自定义视图并添加setOnSystemUiVisibilityChangeListener，但它永远不会被调用。

public void setListener() {
    setOnSystemUiVisibilityChangeListener(new OnSystemUiVisibilityChangeListener() {
        @Override
        public void onSystemUiVisibilityChange(int i) {
            Log.e(TAG, "onSystemUiVisibilityChange =" + i);
        }
    });
}

我从我的服务setListener运行onStartCommand。这里有什么问题？或者有没有其他方法来检测系统ui何时可见？谢谢你的帮助。

Answer 1

您写道：

......来自服务。我尝试创建自定义视图...

LearningDataAnalysis02.hs:22:38: Couldn't match expected type ‘Either String b’ with actual type ‘a0 -> Either a1 b0’ Relevant bindings include func :: [String] -> b (bound at LearningDataAnalysis02.hs:22:20) applyToColumnInCSV :: ([String] -> b) -> CSV -> String -> Either String b (bound at LearningDataAnalysis02.hs:22:1) In the expression: either Left Right . func . elements columnIndex In an equation for ‘applyToColumnInCSV’: applyToColumnInCSV func csv column = either Left Right . func . elements columnIndex where columnIndex = getColumnInCSV csv column nfieldsInFile = length $ head csv records = tail $ filter (\ record -> nfieldsInFile == length record) csv elements ci = map (\ record -> genericIndex record ci) records LearningDataAnalysis02.hs:24:20: Couldn't match expected type ‘a0 -> [String]’ with actual type ‘[Field]’ Possible cause: ‘elements’ is applied to too many arguments In the second argument of ‘(.)’, namely ‘elements columnIndex’ In the second argument of ‘(.)’, namely ‘func . elements columnIndex’ Failed, modules loaded: none.中的自定义View未添加到已绘制的视图层次结构中。这就是为什么不调用该方法的原因。在活动中，您可以执行Service然后检查，但由于您没有引用可见布局，因此无法使用mRootView.add(mCustomView)。

对于（hacky）解决方案，请参阅此答案：Receiving hidden status bar/entering a full screen activity event on a Service

如果Service正在运行时可见Activity，则有更多选项。您可以将Service绑定到Service，并将Activity内的setOnSystemUiVisibility()的更新发送到Activity。请参阅：http://developer.android.com/guide/components/bound-services.html

或者只是在UI状态发生变化时从Service发送广播，Activity会监听。

Answer 2

您可以添加一个视图（全高）并使用OnGlobalLayoutListener进行listerner布局更改，在onGlobalLayout上检查view.getHeight，屏幕最大Y.

if (mMaxY == helperWnd.getHeight()) {
    //full screen
} else {
//none full screen
}

希望帮助你

从Android服务中检测全屏

2 个答案: