安卓webview图片长按保存

 @Override
    public void setListener() {



        webView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                final WebView.HitTestResult hitTestResult = webView.getHitTestResult();
                // 如果是图片类型或者是带有图片链接的类型
                if (hitTestResult.getType() == WebView.HitTestResult.IMAGE_TYPE ||
                        hitTestResult.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
                    // 弹出保存图片的对话框
                    AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
                    builder.setTitle("提示");
                    builder.setMessage("保存图片到本地");
                    builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            picUrl = hitTestResult.getExtra();//获取图片链接
                            //保存图片到相册
                            new Thread(new Runnable() {
                                @Override
                                public void run() {
                                    url2bitmap(picUrl);
                                }
                            }).start();
                        }
                    });
                    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        // 自动dismiss
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                        }
                    });
                    AlertDialog dialog = builder.create();
                    dialog.show();
                    return true;
                }
                return false;//保持长按可以复制文字
            }
        });

    }



    public void url2bitmap(String url) {
        Bitmap bm = null;
        try {
            URL iconUrl = new URL(url);
            URLConnection conn = iconUrl.openConnection();
            HttpURLConnection http = (HttpURLConnection) conn;
            int length = http.getContentLength();
            conn.connect();
            // 获得图像的字符流
            InputStream is = conn.getInputStream();
            BufferedInputStream bis = new BufferedInputStream(is, length);
            bm = BitmapFactory.decodeStream(bis);
            bis.close();
            is.close();
            if (bm != null) {
                save2Album(bm);
            }
        } catch (Exception e) {
            new Handler().post (new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(mActivity, "保存失败", Toast.LENGTH_SHORT).show();
                }
            });
            e.printStackTrace();
        }
    }

    private void save2Album(Bitmap bitmap) {
        File appDir = new File(Environment.getExternalStorageDirectory(), "二维码####");
        if (!appDir.exists()) appDir.mkdir();
        String[] str = picUrl.split("/");
        String fileName = str[str.length - 1];
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
            onSaveSuccess(file);
        } catch (IOException e) {
            mActivity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(mActivity, "保存失败", Toast.LENGTH_SHORT).show();
                }
            });
            e.printStackTrace();
        }
    }

    private void onSaveSuccess(final File file) {
        mActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                mActivity.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));
                Toast.makeText(mActivity, "已成功保存到：相册-二维码####", Toast.LENGTH_SHORT).show();
            }
        });
    }