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   源码介绍

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安卓webView实现长按二维码的自动识别功能

package com.richerpay.zxingcode.zxingcodeforwebview;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.google.zxing.Result;
import com.richerpay.zxingcode.zxingcodeforwebview.widget.CustomDialog;
import com.richerpay.zxingcode.zxingcodeforwebview.widget.CustomWebView;
import com.richerpay.zxingcode.zxingcodeforwebview.widget.CustomWebView.LongClickCallBack;
import com.richerpay.zxingcode.zxingcodeforwebview.zxing.DecodeImage;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends Activity implements LongClickCallBack{

	private CustomWebView mCustomWebView;
	private CustomDialog mCustomDialog;
	private ArrayAdapter<String> adapter;
	private boolean isQR;//判断是否为二维码
	private Result result;//二维码解析结果
	private String url;
	private File file;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initWebView();
	}

	private void initWebView() {
		// 初始WebView化控件
		mCustomWebView = new CustomWebView(this, this);
		//这里借用翔哥的博客
		mCustomWebView.loadUrl("http://blog.csdn.net/lmj623565791/article/details/50709663");//加载页面
		mCustomWebView.setFocusable(true);
		mCustomWebView.setFocusableInTouchMode(true);
		LayoutParams lp= new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
		addContentView(mCustomWebView, lp);
	}

	@Override
	public void onLongClickCallBack(final String imgUrl) {
		url=imgUrl;
		// 获取到图片地址后做相应的处理
		MyAsyncTask	mTask = new MyAsyncTask();
		mTask.execute(imgUrl);
		showDialog();
	}

	/**
	 * 判断是否为二维码
	 * param url 图片地址
	 * return
	 */
	private boolean decodeImage(String sUrl){
		result = DecodeImage.handleQRCodeFormBitmap(getBitmap(sUrl));
		if(result == null){
			isQR = false;
		}else {
			isQR = true;
		}
		return isQR;
	}



	public class MyAsyncTask extends AsyncTask<String, Void, String>{


		@Override
	   protected void onPostExecute(String s) {
		   super.onPostExecute(s);

		   if (isQR){
			   handler.sendEmptyMessage(0);
		   }


	   }

	   @Override
	   protected String doInBackground(String... params) {
		   decodeImage(params[0]);
		   return null;
	   }
   }
	/**
	 * 根据地址获取网络图片
	 * @param sUrl 图片地址
	 * @return
	 * @throws IOException
	 */
	public  Bitmap getBitmap(String sUrl){
		try {
			URL url = new URL(sUrl);
			HttpURLConnection conn = (HttpURLConnection)url.openConnection();
			conn.setConnectTimeout(5000);
			conn.setRequestMethod("GET");
			if(conn.getResponseCode() == 200){
				InputStream inputStream = conn.getInputStream();
				Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
				saveMyBitmap(bitmap,"code");//先把bitmap生成jpg图片
				return bitmap;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 显示Dialog
	 * param v
	 */
	private void  showDialog() {
		initAdapter();
		mCustomDialog = new CustomDialog(this) {
			@Override
			public void initViews() {
				// 初始CustomDialog化控件
				ListView mListView = (ListView) findViewById(R.id.lv_dialog);
				mListView.setAdapter(adapter);
				mListView.setOnItemClickListener(new OnItemClickListener() {

					@Override
					public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
						// 点击事件
						switch (position) {
							case 0:

								sendToFriends();//把图片发送给好友
								closeDialog();
								break;
							case 1:
								saveImageToGallery(MainActivity.this);
								closeDialog();
								break;
							case 2:
								Toast.makeText(MainActivity.this, "已收藏", Toast.LENGTH_LONG).show();
								closeDialog();
								break;
							case 3:
								goIntent();
								closeDialog();
								break;
						}

					}
				});
			}
		};
		mCustomDialog.show();
	}

	/**
	 * 初始化数据
	 */
	private void initAdapter() {
		adapter = new ArrayAdapter<String>(this, R.layout.item_dialog);
		adapter.add("发送给朋友");
		adapter.add("保存到手机");
		adapter.add("收藏");
	}

	/**
	 * 是二维码时，才添加为识别二维码
	 */
	@SuppressLint("HandlerLeak")
	private Handler handler = new Handler(){
		public void handleMessage(Message msg) {
			if (msg.what == 0){
				if (isQR){
					adapter.add("识别图中二维码");
				}
				adapter.notifyDataSetChanged();
			}
		};
	};

	/**
	 * 发送给好友
	 */
	private void sendToFriends() {
		Intent intent=new Intent(Intent.ACTION_SEND);
		Uri imageUri=  Uri.parse(file.getAbsolutePath());
		intent.setType("image/*");
		intent.putExtra(Intent.EXTRA_STREAM, imageUri);
		intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		startActivity(Intent.createChooser(intent, getTitle()));
	}

	/**
	 * bitmap 保存为jpg 图片
	 * @param mBitmap 图片源
	 * @param bitName  图片名
	 */
	public void saveMyBitmap(Bitmap mBitmap,String bitName)  {
		file= new File( Environment.getExternalStorageDirectory() "/" bitName   ".jpg");
		FileOutputStream fOut = null;
		try {
			fOut = new FileOutputStream(file);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
		try {
			fOut.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}
		try {
			fOut.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	/**
	 * 先保存到本地再广播到图库
	 * */
	public  void saveImageToGallery(Context context) {

		// 其次把文件插入到系统图库
		try {
			MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), "code", null);
			// 最后通知图库更新
			context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"
					  file)));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
	public void goIntent(){
		Uri uri = Uri.parse(result.toString());
		Intent intent = new Intent(Intent.ACTION_VIEW,uri);
		startActivity(intent);
	}
}