android webview长按识别图片 ，利用zxing识别图片是否是二维码

主要实现webwiew的OnLongClick()方法 ，利用

final HitTestResult htr = getHitTestResult();//获取所点击的内容

判断点击的是不是图片 ，其主要代码是：

@Override
public boolean onLongClick(View v) {
// 长按事件监听（注意：需要实现LongClickCallBack接口并传入对象）
final HitTestResult htr = getHitTestResult();//获取所点击的内容
if (htr.getType() == HitTestResult.IMAGE_TYPE
|| htr.getType() == HitTestResult.IMAGE_ANCHOR_TYPE
|| htr.getType() == HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
//判断被点击的类型为图片
if (mCallBack!=null) {
mCallBack.onLongClickCallBack(htr.getExtra());
}
}
return false;
}

如果判断是为图片后就可以利用zxing 来识别是否是二维码图片了：

@Override
public void onLongClickCallBack(final String imgUrl) {
imgurl=imgUrl;
// 获取到图片地址后做相应的处理
new Thread(){
public void run() {
decodeImage(imgUrl);
handler.sendEmptyMessage(0);
};
}.start();

showDialog();
}

首先 我们把图片的链接地址 转换成图片：

 /*** 根据地址获取网络图片* @param sUrl 图片地址* @return* @throws IOException*/public static 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);return bitmap;}} catch (Exception e) {e.printStackTrace();}return null;}

把链接转出图片了后在识别图片是不是二维码图：

    /*** 判断是否为二维码* @param sUrl 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;}

如果是二维码图片的画 发送handle 来更新adapter来显示“识别图中二维码”

 @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();}};};

点击保存图片了的话 使用asnytask线程来保存图片到本地 ：

 /**** 功能：用线程保存图片** @author wangyp**/private class SaveImage extends AsyncTask<String, Void, String> {@Overrideprotected String doInBackground(String... params) {String result = "";try {String sdcard;if (FileUtils.SDisExists()){sdcard = Environment.getExternalStorageDirectory().getAbsolutePath();}else{sdcard=getFilesDir().getAbsolutePath();}File file = new File(sdcard + "/Download");if (!file.exists()) {file.mkdirs();}file = new File(sdcard + "/Download/" + new Date().getTime() + ".jpg");InputStream inputStream = null;URL url = new URL(imgurl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(20000);if (conn.getResponseCode() == 200) {inputStream = conn.getInputStream();}byte[] buffer = new byte[4096];int len = 0;FileOutputStream outStream = new FileOutputStream(file);while ((len = inputStream.read(buffer)) != -1) {outStream.write(buffer, 0, len);}outStream.close();result = "图片已保存至：" + file.getAbsolutePath();} catch (Exception e) {result = "保存失败！" + e.getLocalizedMessage();}return result;}@Overrideprotected void onPostExecute(String result) {Toast.makeText(H5Activity.this,result,Toast.LENGTH_SHORT).show();}}

如果用户点击 识别二维码 的话 把识别好了的二维码链接打开浏览器：

Intent intent = new Intent(Intent.ACTION_VIEW);intent.setData(Uri.parse(result.toString()));startActivity(intent);closeDialog();

这是demo点击打开链接下载