禁用的WebView双卡放大 [英] Disabling the WebView double-tab zoom
问题描述
我显示在Android的WebView网页。该页面需要进行调整以适合web视图的可用宽度。
的HTML(宽度550只是一个例子,也可以改变):
< HTML>
< HEAD>
< META NAME =视CONTENT =WIDTH = 550>
...
Java的:
mWebView =(web视图)findViewById(R.id.webView);
mWebView.getSettings()setJavaScriptEnabled(真)。
mWebView.setHorizontalScrollBarEnabled(假);
mWebView.setVerticalScrollBarEnabled(假);
mWebView.requestFocus(View.FOCUS_DOWN);
。mWebView.getSettings()setLoadWithOverviewMode(真正的); //需要缩放
。mWebView.getSettings()setUseWideViewPort(真正的); //需要缩放
mWebView.loadUrl(someUrl);
这工作正常,但一个问题:双卡触发概览模式和默认比例之间的切换
。
有什么办法禁用此功能?
顺便说一句:我不能计算在code的规模,因为加载页面可能有不同的尺寸,这是我事先不知道。我也已经检查的WebView源$ C $ C,却看不到任何东西,我可以代替或改变。</ P>
您可以编写自己的WebView实现implemting OnGestureListener:
公共类MyWebView扩展的WebView实现OnGestureListener
在声明GestureDetector:
私人GestureDetector gestureDetector;
实现一个initWebView()方法,并调用它在这样的构造:
//最好的,你做的每一个WebViewConstructor:
公共AppWebView(上下文的背景下){
超(上下文);
initWebView(); }
私人无效initWebView(){
gestureDetector =新GestureDetector(的getContext(),这一点);
如果你喜欢//是否有任何其他自定义你的web视图。
}
现在实现从OnGestureListener方法并返回true上双击事件:
公共布尔onSingleTapConfirmed(MotionEvent E){
返回false; //没有
}
公共布尔onDoubleTap(MotionEvent E){
返回true; //没有
}
公共布尔onDoubleTapEvent(MotionEvent E){
返回true; //没有
}
公共布尔onDown(MotionEvent E){
返回false; //没有
}
公共无效OnShow中preSS(MotionEvent E){
//没有
}
公共布尔onSingleTapUp(MotionEvent E){
返回false; //没有
}
公共布尔onScroll(MotionEvent E1,E2 MotionEvent,浮distanceX,浮distanceY){
返回false; //没有
}
公共无效onLong preSS(MotionEvent E){
//没有
}
公共布尔onFling(MotionEvent E1,E2 MotionEvent,浮velocityX,浮velocityY){
返回false; //没有
}
最后覆盖您的WebView中的onTouchEvent,让它穿过事件手势检测是这样的:
@覆盖
公共布尔的onTouchEvent(MotionEvent事件){
如果(gestureDetector.onTouchEvent(事件))回归真实;
返回super.onTouchEvent(事件);
}
本作品pretty的好一般,但有1基本缺陷这一解决方案:未认定为DoubleTap事件的一些活动可能会导致你的web视图的放大。
I'm仍然在为一个解决方案,将在这里发布我的进步: 的WebView摆脱双击缩放。
I am showing a webpage in an Android WebView. The page needs to be scaled to fit the available width of the WebView.
HTML (width 550 is just an example, that could change):
<html>
<head>
<meta name="viewport" content="width=550">
...
Java:
mWebView = (WebView)findViewById(R.id.webView);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setHorizontalScrollBarEnabled(false);
mWebView.setVerticalScrollBarEnabled(false);
mWebView.requestFocus(View.FOCUS_DOWN);
mWebView.getSettings().setLoadWithOverviewMode(true); // required for scaling
mWebView.getSettings().setUseWideViewPort(true); // required for scaling
mWebView.loadUrl(someUrl);
This works fine, except one problem: double-tab triggers a switch between overview mode and default scale.
Is there any way to disable this functionality?
Btw: I cannot calculate the scale in the code, because the loaded pages might have different sizes, which I do not know beforehand. I also already checked the source code of WebView, but do not see anything, that I could override or change.
You could write your own WebView implementation implemting OnGestureListener:
public class MyWebView extends WebView implements OnGestureListener
Inside declare a GestureDetector:
private GestureDetector gestureDetector;
Implement a initWebView() method and call it in the constructor like this:
// Best you do this for every WebViewConstructor:
public AppWebView(Context context) {
super(context);
initWebView(); }
private void initWebView(){
gestureDetector = new GestureDetector(getContext(), this);
// Do any other customizations for your webview if you like.
}
Now implement the methods from OnGestureListener and return true on double tap events:
public boolean onSingleTapConfirmed(MotionEvent e) {
return false; //Nothing
}
public boolean onDoubleTap(MotionEvent e) {
return true; //Nothing
}
public boolean onDoubleTapEvent(MotionEvent e) {
return true; //Nothing
}
public boolean onDown(MotionEvent e) {
return false; //Nothing
}
public void onShowPress(MotionEvent e) {
//Nothing
}
public boolean onSingleTapUp(MotionEvent e) {
return false; //Nothing
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return false; //Nothing
}
public void onLongPress(MotionEvent e) {
//Nothing
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false; //Nothing
}
Finally Override OnTouchEvent of your webview and let it pass through events to the gesture detector like this:
@Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) return true;
return super.onTouchEvent(event);
}
This works pretty good generally but there is 1 basic flaw to this solution: Some Events that are not identified as DoubleTap events could cause the Zoom of your webview.
I´m still working on a solution for that and will post my progress here: WebView getting rid of double tap zoom.
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