我在 Android 2.2 上,我正在创建一个对话框,里面有一个 WebView
:
@Override
protected Dialog onCreateDialog(int id) {
Dialog dialog = new Dialog(this);
//.....
dialog.setContentView(R.layout.dialoghelp);
WebView v = (WebView)dialog.findViewById(R.id.helpWebView);
v.loadUrl("file:///android_asset/help.html");
//......
return dialog;
}
它工作正常,但我第一次打开对话框时,WebView
没有布局,即使内容已实际加载也是如此。
我知道这一点是因为使用 HierarchyViewer 我可以看到内容并强制布局请求我也可以在模拟器中看到它们。此外,如果我只是取消对话框并重新打开它,一切正常。
谁错了,Android 还是我?我尝试将加载放在 onPrepareDialog()
中,但它是一样的。
编辑
我将 WebView
的布局参数从 fill_parent
更改为 wrap_content
,这样就可以了。我可以看到它以 0 高度打开,然后在加载后长大。宽度甚至在以前就起作用了。
最佳答案
好吧,我认为您可能需要重写 Dialog 类,类似于 facebook sdk 已经实现的类:-
这里有代码
公共(public)类 FbDialog 扩展对话框 {
static final int FB_BLUE = 0xFF6D84B4;
static final float[] DIMENSIONS_DIFF_LANDSCAPE = {20, 60};
static final float[] DIMENSIONS_DIFF_PORTRAIT = {40, 60};
static final FrameLayout.LayoutParams FILL =
new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT);
static final int MARGIN = 4;
static final int PADDING = 2;
static final String DISPLAY_STRING = "touch";
static final String FB_ICON = "icon.png";
private String mUrl;
private DialogListener mListener;
private ProgressDialog mSpinner;
private ImageView mCrossImage;
private WebView mWebView;
private FrameLayout mContent;
public FbDialog(Context context, String url, DialogListener listener) {
super(context, android.R.style.Theme_Translucent_NoTitleBar);
mUrl = url;
mListener = listener;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSpinner = new ProgressDialog(getContext());
mSpinner.requestWindowFeature(Window.FEATURE_NO_TITLE);
mSpinner.setMessage("Loading...");
requestWindowFeature(Window.FEATURE_NO_TITLE);
mContent = new FrameLayout(getContext());
/* Create the 'x' image, but don't add to the mContent layout yet
* at this point, we only need to know its drawable width and height
* to place the webview
*/
createCrossImage();
/* Now we know 'x' drawable width and height,
* layout the webivew and add it the mContent layout
*/
int crossWidth = mCrossImage.getDrawable().getIntrinsicWidth();
setUpWebView(crossWidth / 2);
/* Finally add the 'x' image to the mContent layout and
* add mContent to the Dialog view
*/
mContent.addView(mCrossImage, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
addContentView(mContent, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
private void createCrossImage() {
mCrossImage = new ImageView(getContext());
// Dismiss the dialog when user click on the 'x'
mCrossImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mListener.onCancel();
FbDialog.this.dismiss();
}
});
Drawable crossDrawable = getContext().getResources().getDrawable(R.drawable.close);
mCrossImage.setImageDrawable(crossDrawable);
/* 'x' should not be visible while webview is loading
* make it visible only after webview has fully loaded
*/
mCrossImage.setVisibility(View.INVISIBLE);
}
private void setUpWebView(int margin) {
LinearLayout webViewContainer = new LinearLayout(getContext());
mWebView = new WebView(getContext());
mWebView.setVerticalScrollBarEnabled(false);
mWebView.setHorizontalScrollBarEnabled(false);
mWebView.setWebViewClient(new FbDialog.FbWebViewClient());
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl(mUrl);
mWebView.setLayoutParams(FILL);
mWebView.setVisibility(View.INVISIBLE);
mWebView.getSettings().setSavePassword(false);
webViewContainer.setPadding(margin, margin, margin, margin);
webViewContainer.addView(mWebView);
mContent.addView(webViewContainer);
}
private class FbWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Util.logd("Facebook-WebView", "Redirect URL: " + url);
if (url.startsWith(Facebook.REDIRECT_URI)) {
Bundle values = Util.parseUrl(url);
String error = values.getString("error");
if (error == null) {
error = values.getString("error_type");
}
if (error == null) {
mListener.onComplete(values);
} else if (error.equals("access_denied") ||
error.equals("OAuthAccessDeniedException")) {
mListener.onCancel();
} else {
mListener.onFacebookError(new FacebookError(error));
}
FbDialog.this.dismiss();
return true;
} else if (url.startsWith(Facebook.CANCEL_URI)) {
mListener.onCancel();
FbDialog.this.dismiss();
return true;
} else if (url.contains(DISPLAY_STRING)) {
return false;
}
// launch non-dialog URLs in a full browser
getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
}
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
mListener.onError(
new DialogError(description, errorCode, failingUrl));
FbDialog.this.dismiss();
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Util.logd("Facebook-WebView", "Webview loading URL: " + url);
super.onPageStarted(view, url, favicon);
mSpinner.show();
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
mSpinner.dismiss();
/*
* Once webview is fully loaded, set the mContent background to be transparent
* and make visible the 'x' image.
*/
mContent.setBackgroundColor(Color.TRANSPARENT);
mWebView.setVisibility(View.VISIBLE);
mCrossImage.setVisibility(View.VISIBLE);
}
}
关于android - 对话框中的 WebView(加载 Assets )且未布局,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5366330/