以下是一些可能解决Android相机问题的代码示例：

1. 确保在使用相机之前已经授予了适当的权限：

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_DENIED){
    ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.CAMERA}, CAMERA_PERMISSION);
}

2. 确保程序正确地释放相机资源：

@Override
protected void onPause() {
    super.onPause();
    if (mCamera != null) {
        mCamera.release();
        mCamera = null;
    }
}

3. 检查相机预览尺寸是否合适：

private void setCameraPreviewSize() {
    List sizes = mCamera.getParameters().getSupportedPreviewSizes();
    Camera.Size bestSize = sizes.get(0);
    for (int i = 1; i < sizes.size(); i++) {
        if ((sizes.get(i).width * sizes.get(i).height) > (bestSize.width * bestSize.height)) {
            bestSize = sizes.get(i);
        }
    }
    mCamera.getParameters().setPreviewSize(bestSize.width, bestSize.height);
}

4. 确保上下文正确传递给相机回调：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
    ...
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.setPreviewCallback(new PreviewCallback() {
                @Override
                public void onPreviewFrame(byte[] data, Camera camera) {
                    // process preview data
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    ...
}