相机preVIEW是后屏幕关闭，屏幕上全黑 [英] Camera preview is completely black after screen off, screen on

问题描述

我跟在API演示相机preVIEW自带的Andr​​oid SDK的工作。当摄像机preVIEW正在运行，如果我关掉我的屏幕，并再次打开，相机preVIEW完全是黑色的。该设备的摄像头应用程序以某种方式设法恢复相机preVIEW，所以必须有一种方式。

I'm working with the CameraPreview in the API Demos that comes with the Android SDK. While the camera preview is running, if I turn off my screen and turn it on again, the camera preview is completely black. The device's camera application somehow manages to restore the camera preview, so there must be a way.

不是我试图表现出这种行为的所有设备。我无法证实，但它似乎是操作系统版本的问题。

Not all devices I've tried exhibit this behavior. I can't confirm, but it seems like the OS version matters.

推荐答案

什么帮助我是的setContentView（）在onResume（）。

What helped me was setContentView() in onResume().

它可以是

protected void onResume() {
    super.onResume();
    setContentView(R.layout.xxx);
    // ...
}

或

private View cachedContentView;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    cachedContentView = doCreateContentView(getLayoutInflater());
    // ...
}
protected void onResume() {
    super.onResume();
    setContentView(cachedContentView);
    // ...
}

他们两人的工作。

Both of them work.

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