Question

我有一个扫描qr代码的应用。该应用程序返回名为value的字符串中的url。我想在webview中打开url。如何在CameraTestActivity中调用WebViewActivity，WebViewActivity使用CameraTestActvity中的URL来加载网站。代码中有关于我想要做的事情的评论，但我不知道如何。你能帮我么？我可能因为这个问题而无法毕业？我已经好几天了。

CameraTestActivity.java

import net.sourceforge.zbar.Config;
import net.sourceforge.zbar.Image;
import net.sourceforge.zbar.ImageScanner;
import net.sourceforge.zbar.Symbol;
import net.sourceforge.zbar.SymbolSet;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.os.Handler;
import android.text.method.LinkMovementMethod;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.TextView;
/* Import ZBar Class files */



@SuppressLint("SetJavaScriptEnabled")
public class CameraTestActivity extends Activity
{
    private Camera mCamera;
    private CameraPreview mPreview;
    private Handler autoFocusHandler;

    TextView scanText;
    Button scanButton;
    Button exitButton;
    WebView web;

    ImageScanner scanner;

    private boolean barcodeScanned = false;
    private boolean previewing = true;

    static {
        System.loadLibrary("iconv");
    } 

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        autoFocusHandler = new Handler();
        mCamera = getCameraInstance();

        /* Instance barcode scanner */
        scanner = new ImageScanner();
        scanner.setConfig(0, Config.X_DENSITY, 3);
        scanner.setConfig(0, Config.Y_DENSITY, 3);

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



        scanText = (TextView)findViewById(R.id.scanText);

        scanButton = (Button)findViewById(R.id.ScanButton);

        scanButton.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    if (barcodeScanned) {
                        barcodeScanned = false;
                        scanText.setText("Place code inside the square to scan");
                        mCamera.setPreviewCallback(previewCb);                       
                        mCamera.startPreview();
                        previewing = true;
                        mCamera.autoFocus(autoFocusCB);

                    }
                }
            });

        exitButton = (Button)findViewById(R.id.ExitButton);

        exitButton.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            finish();
            System.exit(0);
        }
    });

    }


    public void onPause() {
            super.onPause();

            if (mCamera != null) {
                mCamera.setPreviewCallback(null);
                mPreview.getHolder().removeCallback(mPreview);   // you need this line
                releaseCamera();
        }
    }

    @Override
    public void onResume() {
        super.onResume();  
        // Get the Camera instance as the activity achieves full user focus
        try {       
            mCamera = Camera.open();          
            mCamera.setPreviewCallback(null);      
            mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB);
            FrameLayout preview = (FrameLayout)findViewById(R.id.cameraPreview);
            preview.addView(mPreview); 
            mCamera.startPreview();              
        } catch (Exception e) {      

        }      

}



    /** A safe way to get an instance of the Camera object. */
    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open();
        } catch (Exception e){
        }
        return c;
    }

    private Runnable doAutoFocus = new Runnable() {
            public void run() {
                if (previewing)
                    mCamera.autoFocus(autoFocusCB);
            }
        };


    PreviewCallback previewCb = new PreviewCallback() {
            public void onPreviewFrame(byte[] data, Camera camera) {
                Camera.Parameters parameters = camera.getParameters();
                Size size = parameters.getPreviewSize();

                Image barcode = new Image(size.width, size.height, "Y800");
                barcode.setData(data);

                int result = scanner.scanImage(barcode);

                if (result != 0) {
                    previewing = false;
                    mCamera.setPreviewCallback(null);
                    mCamera.stopPreview();

                    SymbolSet syms = scanner.getResults();
                    for (Symbol sym : syms) {

                      String value = new String(sym.getData()); //url scanned from the qr code 
                      if(value.startsWith("http://192.168.1.6")){ //if the url starts with 

                      scanText.setText("QR Code result: " + value);
                        barcodeScanned = true;
                        //intent for WebViewActivty.java 
                        //The WebViewActivty.java should load the string value which contains the the url 



                      }
                      else{
                          scanText.setText("QR Code result 2: " + value);
                          barcodeScanned = true;
                          }
                       TextView tv = (TextView) findViewById(R.id.scanText);
                        tv.setMovementMethod(LinkMovementMethod.getInstance());


                    }

                }


            }
        };

    // Mimic continuous auto-focusing
    AutoFocusCallback autoFocusCB = new AutoFocusCallback() {
            public void onAutoFocus(boolean success, Camera camera) {
                autoFocusHandler.postDelayed(doAutoFocus, 1000);
            }
        };

        private void releaseCamera(){
            if (mCamera != null){
                mCamera.release();        // release the camera for other applications
                mCamera = null;
            }
        }
}

WebViewActivity.java

    package net.sourceforge.zbar.android.CameraTest;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;


public class WebViewActivity extends Activity {

    private WebView webView;

    @SuppressLint("SetJavaScriptEnabled")
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);


        webView = (WebView) findViewById(R.id.web_engine);
        webView.setWebViewClient(new MyWebClient()); 
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl("http://192.168.1.6/sp/products.php");//the link should be from the CameraTestActivity


    }
}   
 class MyWebClient extends WebViewClient {
     @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            // TODO Auto-generated method stub

            return false;

        }
 }

Answer 1

用此替换预览回调。

            PreviewCallback previewCb = new PreviewCallback() {
            public void onPreviewFrame(byte[] data, Camera camera) {
            Camera.Parameters parameters = camera.getParameters();
            Size size = parameters.getPreviewSize();

            Image barcode = new Image(size.width, size.height, "Y800");
            barcode.setData(data);

            int result = scanner.scanImage(barcode);

            if (result != 0) {
                previewing = false;
                mCamera.setPreviewCallback(null);
                mCamera.stopPreview();

                SymbolSet syms = scanner.getResults();
                for (Symbol sym : syms) {

                  String value = new String(sym.getData()); //url scanned from the qr code 
                 Intent i = new Intent(CameraTestActivity.this,WebViewActivity.class);
                 i.putExtra("mUrl",value);
                 startActivity(i)
                  }
                  else{
                      scanText.setText("QR Code result 2: " + value);
                      barcodeScanned = true;
                      }
                   TextView tv = (TextView) findViewById(R.id.scanText);
                    tv.setMovementMethod(LinkMovementMethod.getInstance());
                }
            }
        }
    };

并将您的webActivity更改为：

    String mUrl = getIntent().getStringExtra("mUrl");
    webView = (WebView) findViewById(R.id.web_engine);
    webView.setWebViewClient(new MyWebClient()); 
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl(mUrl);

Answer 2

如果您使用（'me.dm7.barcodescanner：zxing：1.9'）库。因此，请遵循此步骤。希望它也对您有用。

   Intent newWindow = new Intent(getApplicationContext(), Browser.class);
            newWindow.putExtra("scannedLink", myResult);
            startActivity(newWindow);

快乐编码

带webview的Qr代码扫描程序

2 个答案: