按照本教程(http://www.truiton.com/2015/06/android-tabs-example-fragments-viewpager/),我制作了带有片段和ViewPager的Android选项卡.到目前为止,我向其中一个片段添加了QR码扫描仪(使用基于ZXing的条形码扫描仪库),并且工作正常.

问题是当我转到其他选项卡(片段)时,摄像机本身仍在内部工作(内部摄像机不会停止).因此,即使我在屏幕上看不到相机的不同片段,当我将手机(相机部件)放置在QR码附近时,它也会读取并开始新的活动.

那么当我去其他片段时如何停止相机？

这是我的QR码扫描仪的片段.

public class TabFragment1 extends Fragment implements ZXingScannerView.ResultHandler
{
   private ZXingScannerView mScannerView;
   private LinearLayout qrCameraLayout;

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
   {
      View v = inflater.inflate(R.layout.tab_fragment_1, container, false);

      qrCameraLayout = (LinearLayout) v.findViewById(R.id.ll_qrcamera);
      mScannerView = new ZXingScannerView(getActivity().getApplicationContext());
      mScannerView.setLayoutParams(new LinearLayout.LayoutParams(
         LinearLayout.LayoutParams.MATCH_PARENT,
         LinearLayout.LayoutParams.MATCH_PARENT));
      qrCameraLayout.addView(mScannerView);

      List<BarcodeFormat> formats = new ArrayList<>();
      formats.add(BarcodeFormat.QR_CODE);
      mScannerView.setFormats(formats);

      return v;
   }

   @Override
   public void onResume()
   {
      super.onResume();
      mScannerView.setResultHandler(this); // Register ourselves as a handler for scan results.
      mScannerView.startCamera();          // Start camera on resume
   }

   @Override
   public void onPause()
   {
      super.onPause();
      mScannerView.stopCamera();
   }

   @Override
   public void handleResult(final Result result)
   {
      //handling results
   }

解决方法:

我尝试了一些方法来解决此问题,最后得到了解决方案.

public void handleResult(Result result) {
        //Hold result
        Log.e("handler", result.getText()); // Prints scan results
        Log.e("handler", result.getBarcodeFormat().toString()); // Prints the scan format (qrcode)
        mScannerView.removeAllViews(); //<- here remove all the views, it will make an Activity having no View
        mScannerView.stopCamera(); //<- then stop the camera
        setContentView(R.layout.activity_Main); //<- and set the View again.
        final String vString = result.getText();
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(mContext,vString,Toast.LENGTH_LONG).show();
            }
        });
        // to resume scanning
        // mScannerView.resumeCameraPreview(this);<br />
    }
}

再次设置ContentView解决了m的问题