我想在 WebView 中对图像启用长按下载操作。那是我为此尝试过的代码 fragment :
public void onCreate(Bundle savedInstanceState) {
registerForContextMenu(descriptionWebView);
}
public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
WebView.HitTestResult hitTestResult = descriptionWebView.getHitTestResult();
switch (hitTestResult.getType()) {
// ...
}
}
最佳答案
您需要为上下文菜单注册您的 WebView。在你的 Activity 中 registerForContextMenu(webView);
重写 onCreateContextMenu 方法后显示如下
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView)findViewById(R.id.WebView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient());
registerForContextMenu(webView);
webView.loadUrl(HTTP_URL);
}
@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.setHeaderTitle("Download Image From Below");
contextMenu.add(0, 1, 0, "Save - Download Image")
.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
String DownloadImageURL = webViewHitTestResult.getExtra();
if(URLUtil.isValidUrl(DownloadImageURL)){
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(DownloadImageURL));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
downloadManager.enqueue(request);
Toast.makeText(MainActivity.this,"Image Downloaded Successfully.",Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(MainActivity.this,"Sorry.. Something Went Wrong.",Toast.LENGTH_LONG).show();
}
return false;
}
});
}
}
或者这是另一种选择
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
final WebView.HitTestResult result = browser.getHitTestResult();
MenuItem.OnMenuItemClickListener handler = new MenuItem.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
// handle on context menu click
return true;
}
};
if (result.getType() == WebView.HitTestResult.IMAGE_TYPE ||
result.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
menu.setHeaderTitle(result.getExtra());
menu.add(0, 666, 0, "Save Image").setOnMenuItemClickListener(handler);
}
}
关于javascript - 如何启用长按操作以在 android WebView 中下载图像?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47850709/