Android WebView 弹出选项并保存图片到本地

为 WebView 注册配置

registerForContextMenu(webView);

添加保存方法

@Override
public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenu.ContextMenuInfo contextMenuInfo){
    super.onCreateContextMenu(contextMenu, view, contextMenuInfo);

    final WebView.HitTestResult webViewHitTestResult = webView.getHitTestResult();

    if (webViewHitTestResult.getType() == WebView.HitTestResult.IMAGE_TYPE || webViewHitTestResult.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
        contextMenu.add(0, 1, 0, "保存图片到本地")
                .setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem menuItem) {

                        String DownloadImageURL = webViewHitTestResult.getExtra();
                        String fileName = URLUtil.guessFileName(DownloadImageURL, null, null);
                        if(URLUtil.isValidUrl(DownloadImageURL)){
                            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(DownloadImageURL));
                            request.allowScanningByMediaScanner();
                            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,fileName);
                            DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                            downloadManager.enqueue(request);

                            Toast.makeText(MainActivity.this,"保存成功",Toast.LENGTH_LONG).show();
                        }
                        else {
                            Toast.makeText(MainActivity.this,"保存失败",Toast.LENGTH_LONG).show();
                        }
                        return false;
                    }
                });
    }
}