无法在片段中访问构造函数public CameraPreview（Context fragment，Camera camera，PreviewCallback previewCb，AutoFocusCallback autoFocusCb）

Question

我试图在片段类中调用构造函数。但是它显示错误。

这是构造函数代码：

public CameraPreview(Context fragment, Camera camera,
                     PreviewCallback previewCb,
                     AutoFocusCallback autoFocusCb) {
    super(fragment);
    mCamera = camera;
    previewCallback = previewCb;
    autoFocusCallback = autoFocusCb;

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);

    // deprecated setting, but required on Android versions prior to 3.0
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

然后我尝试访问另一个片段类：

mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB); FrameLayout preview = (FrameLayout) getView().findViewById(R.id.cameraPreview); preview.addView(mPreview);

我注意到问题是＆＃34;这个＆＃34;。我该如何解决？谢谢。

Answer 1

如果此调用是片段，则应为：

mPreview = new CameraPreview(this.getActivity(), mCamera, previewCb, autoFocusCB);

this.getActivity()将为您提供上下文，Fragment不会扩展Context类，因此这实际上是错误的命名：Context fragment。