您好,
我创建了一个使用ViewPager的应用程序,所有页面都包含WebViews。 每个Webview都包含服务器图像,视频,mp3 ......
WebView设置
public Object instantiateItem(View collection, int position) {
.
.
.
final RelativeLayout imageLayout = (RelativeLayout)
inflater.inflate(R.layout.omb_webview_layout, null);
WebView webview = (WebView) imageLayout.findViewById(R.id.video_view);
ProgressBar pbImage = (ProgressBar) imageLayout.findViewById(R.id.progressBar1);
webview.requestFocus(View.FOCUS_DOWN);
webview.getSettings().setBuiltInZoomControls(false);
webview.getSettings().setSupportZoom(true);
webview.getSettings().setUseWideViewPort(true);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.setWebViewClient(new mWebViewClient());
webview.getSettings().setPluginsEnabled(true);
webview.clearCache(true);
webview.clearHistory();
if(Pbar != null) {
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
Log.i(TAG, "webview loading progress : "+ progress);
if(progress == 100) {
try {
Pbar.setVisibility(ProgressBar.GONE);
} catch (Exception e) {
Log.e(TAG, "timer progress GONE : "+ progress,e);
}
}
});
}
问题是当页面被刷过时,也就是这一行
Log.i(TAG, "webview loading progress : "+ progress);
正在执行,这意味着webview正在后台加载。 如果我滑动4个或更多页面,则所有网页视图都会加载。
destroyItem(View collection, int position, Object o) {
Log.d("DESTROY", "destroying view at position sheetal " + position);
RelativeLayout view = (RelativeLayout)o;
WebView tmp = webviewDictionary.get(position);;
tmp.getSettings().setJavaScriptEnabled(false);
tmp.stopLoading();
if(tmp != null){
Log.i(TAG, "sheetal webview is destroyed " +position );
try {
tmp.onPause();
tmp.loadDataWithBaseURL("about:blank", "<html></html>","text/html", "UTF-8", null);
tmp=null;
// tmp.destroy();
}
catch (Exception e) {
Log.i(TAG, "webview destroyed Exception 0" ,e);
}
}
如果页面不可见,如何停止后台加载? setOffscreenPageLimit(1)(表示3页prev,cur,next),
在Viewpager中,2页(表示1位置页面)未正确加载。它显示一个空白页面,我该如何解决?
提前致谢
答案 0 :(得分:2)
我创建了一个字典,它包含3个webview,位置为关键字。
这里我在字典中添加webviews
public Object instantiateItem(View collection, int position) {
.
.
.
webviewDictionary.put(position, webView);
.
.
.
}
清洁网页浏览来自字典
public void cleanAllWebViews() {
try {
if(webviewDictionary != null){
Iterator<Integer> webViewIterator = webviewDictionary.keySet().iterator();
while(webViewIterator.hasNext()) {
Integer key=(Integer)webViewIterator.next();
WebView webView = (WebView) webviewDictionary.get(key);
webView.stopLoading();
// webView.pauseTimers();
webView.setWebChromeClient(null);
webView.setWebViewClient(null);
webView.loadDataWithBaseURL("about:blank", "<html></html>","text/html", "UTF-8", null);
webViewIterator.remove();
}
}
webviewDictionary = null;
}catch (Exception e) {
Log.e(TAG, "ombook last call onPauseAllWebviews Exception",e );
}
}
and
@Override
public void onBackPressed() {
cleanAllWebViews();
System.gc();
super.onBackPressed();
}
答案 1 :(得分:1)
你试过“OffscreenPageLimit”设置为1吗?根据这篇文章,0是无效值: ViewPager.setOffscreenPageLimit(0) doesn't work as expected
另外,您是否尝试过处理页面之间切换的事件,以便每次切换页面时,当前页面的webview都会停止加载,或者开始加载空的html文件?