android studio中初始化相机代码错误如何修改

Question

我在学习android studio中，复制了一段网上的代码，其中有一句代码在我的代码中报错如下，但我不明白这个错误什么什么意思，也不知道正确的写法是什么？请专家指点。

部分代码一

public class MipcaActivityCapture extends Activity implements Callback {
    private static final String codetype = "codetype";
    private CaptureActivityHandler handler;
    private ViewfinderView viewfinderView;
    private boolean hasSurface;
    private Vector<BarcodeFormat> decodeFormats;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private MediaPlayer mediaPlayer;
    private boolean playBeep;
    private static final float BEEP_VOLUME = 0.10f;
    private boolean vibrate;
    private String TAG = "com.example.qr_codescan";
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_capture);
        // ViewUtil.addTopView(getApplicationContext(), this,
        // R.string.scan_card);
        CameraManager.init(getApplication());

部分代码二：

//初始化摄像机
    private void initCamera(SurfaceHolder surfaceHolder) {
        if (surfaceHolder == null) {
            throw new IllegalStateException("No SurfaceHolder provided");
        }
        try {
            CameraManager.get().openDriver(surfaceHolder);
        } catch (IOException ioe) {
            return;
        } catch (RuntimeException e) {
            return;
        }
        if (handler == null) {
            handler = new CaptureActivityHandler(this, decodeFormats,characterSet);
        }
    }

Answer 1

看图片提示 CaptureActivityHandler 的第一个参数需要的是Activity。可修改为：

MipcaActivityCapture extends Activity

handler = new CaptureActivityHandler(MipcaActivityCapture.this, decodeFormats,characterSet);