java - 无法访问 fragment 中的构造函数 public CameraPreview(Contextfragment,Cameracamera,PreviewCallbackpreviewCb,AutoFocusCallbackautoFocusCb)

Question

我尝试调用 fragment 类中的构造函数。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);
}

然后我尝试访问位于另一个 fragment 类中:

mPreview = new CameraPreview(this, mCamera, PreviewCb, autoFocusCB);
FrameLayout预览 = (FrameLayout) getView().findViewById(R.id.cameraPreview);
Preview.addView(mPreview);

我注意到问题是“这个”。我应该如何解决呢？谢谢。

Answer 1

如果这个调用是在 fragment 中，那么它应该是:

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

this.getActivity() 将为您获取 Context，Fragment 不会扩展 Context 类，因此这实际上是错误的命名:Context Fragment >.