我试图让一个web视图的高度,一旦被渲染。它,我已经试过总是返回null 的getHeight
, getMeasuredHeight
, getContentHeight
,它总是返回null。
I'm trying to get the height of a webview once it has been rendered. It always returns null, I've tried getHeight
, getMeasuredHeight
, getContentHeight
and it always returns null.
布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/instructions"
android:background="@color/transparent_black" >
<WebView
android:id="@+id/top_content"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
活动
public class TestActivity extends MenuActivity {
private final static String TAG = "HearingTest";
private String urlTopContent;
private WebView topContent;
private boolean mMoreInfoTop = true;
private int mYdelta = 0;
private int mBottomOffset = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.right_hearing_test);
String topHtml = this.getString(R.string.top_content);
//String bottomHtml = this.getString(R.string.bottom_content);
urlTopContent = "file:///android_asset/html/" + topHtml;
WebViewSettings();
LoadWebPage(urlTopContent);
}
public void WebViewSettings(){
topContent = (WebView) findViewById(R.id.top_content);
topContent.getSettings().setJavaScriptEnabled(true);
topContent.getSettings().setBuiltInZoomControls(true);
topContent.getSettings().setSupportZoom(true);
topContent.getSettings().setLoadWithOverviewMode(true);
topContent.setBackgroundColor(0);
topContent.canGoBack();
int topHeight = topContent.getContentHeight();
Log.d("Top Height", "Height: " + topHeight);
topContent.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().equals(urlTopContent)) {
// This is my web site, so do not override; let my WebView load the page
return false;
}
// Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
View webViewHeight = (View) findViewById(R.id.top_content);
int height = webViewHeight.getHeight();
Log.d("Top Content","Top Content Height:" + height);
}
});
}
public void LoadWebPage(String url){
try {
topContent.loadUrl(url);
Log.d("Loading Web Page", "URL" + url + "connected");
}
catch (Exception e) {
Log.d("Loading Web Page", "URL: " + url + " couldn't connect.");
}
}
}
我甚至不知道这是否是可能得到Web视图的高度,它已经呈现后,但我不明白为什么你不能。如果任何人有和解决方案,这将是极大的AP preciated。
I don't even know if it's possible to get the height of the web view after it has rendered but I don't see why you couldn't. if anyones got and solutions it would be greatly appreciated.
您可以使用 ViewTreeObserver
上的WebView
呈现其内容之后得到实际高度。
You can use ViewTreeObserver
on that WebView
to get actual height after rendering its content.
下面的示例code。
ViewTreeObserver viewTreeObserver = mWebView.getViewTreeObserver();
viewTreeObserver.addOnPreDrawListener(new OnPreDrawListener() {
@Override
public boolean onPreDraw() {
int height = mWebView.getMeasuredHeight();
if( height != 0 ){
Toast.makeText(getActivity(), "height:"+height,Toast.LENGTH_SHORT).show();
mWebView.getViewTreeObserver().removeOnPreDrawListener(this);
}
return false;
}
});