Android WebView Long Press长按保存图片到手机

<span style="font-size:18px;">首先要先注册长按监听菜单private String imgurl = "";/**** 功能：长按图片保存到手机*/@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {super.onCreateContextMenu(menu, v, menuInfo);MenuItem.OnMenuItemClickListener handler = new MenuItem.OnMenuItemClickListener() {public boolean onMenuItemClick(MenuItem item) {if (item.getTitle() == "保存到手机") {new SaveImage().execute(); // Android 4.0以后要使用线程来访问网络} else {return false;}return true;}};if (v instanceof WebView) {WebView.HitTestResult result = ((WebView) v).getHitTestResult();if (result != null) {int type = result.getType();if (type == WebView.HitTestResult.IMAGE_TYPE || type == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {imgurl = result.getExtra();menu.setHeaderTitle("提示");menu.add(0, v.getId(), 0, "保存到手机").setOnMenuItemClickListener(handler);}}}}/**** 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 = Environment.getExternalStorageDirectory().toString();File file = new File(sdcard + "/Download");if (!file.exists()) {file.mkdirs();}int idx = imgurl.lastIndexOf(".");String ext = imgurl.substring(idx);file = new File(sdcard + "/Download/" + new Date().getTime() + ext);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) {MsgBox("提示", result);}}</span>