android webview不会在片段中加载 [英] android webview do not load in fragment
问题描述
我面临着一个非常非常奇怪的问题:我试图在一个片段中加载Webview,但是我想我找不到使它运行的方法,并且我对原因有绝对的了解.奇怪的是,如果在一个Activity中运行,相同的代码也可以工作
I'm facing with a very very strange problem: I'm trying to load a webview in a fragment, but I sware I can't find a way to make it working and I have absolutely any idea about the reason. The strange is that the same identical code works if run in an Activity
这是我非常基本的布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<WebView
android:id="@+id/webview"
android:background="@color/black"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
这是代码有效的活动
public class ProvaWebview extends Activity {
WebView wv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prova_webview);
wv=(WebView)findViewById(R.id.webview);
WebSettings settings=wv.getSettings();
wv.setWebChromeClient(new WebChromeClient() {
});
final String mimeType = "text/html";
final String encoding = "UTF-8";
String html = getHTML();
settings.setJavaScriptEnabled(true);
wv.loadDataWithBaseURL("", html, mimeType, encoding, "");
}
@Override
public void onBackPressed() {
super.onBackPressed();
wv.clearHistory();
wv.clearCache(true);
wv.loadUrl("about:blank");
wv.pauseTimers(); //new code
wv = null;
}
public String getHTML() {
String html = "<iframe width=\"100%\" height=\"100%\" src=\"https://www.youtube.com/embed/hEFqVV5q44E?rel=0&controls=0&showinfo=0\" frameborder=\"0\" allowfullscreen></iframe>";
return html;
}
}
这是代码不起作用的片段
and this is the fragment where the code don't work
public class FrTabDescriptionWebView extends Fragment {
public static final String TAG = FrTabDescriptionWebView.class.getName();
private WebView wv;
public static FrTabDescriptionWebView newInstance() {
FrTabDescriptionWebView fragment = new FrTabDescriptionWebView();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public FrTabDescriptionWebView() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.activity_prova_webview, null);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
wv = (WebView) view.findViewById(R.id.webview);
WebSettings settings = wv.getSettings();
wv.setWebChromeClient(new WebChromeClient() {
});
final String mimeType = "text/html";
final String encoding = "UTF-8";
String html = getHTML();
settings.setJavaScriptEnabled(true);
wv.loadDataWithBaseURL("", html, mimeType, encoding, "");
}
public String getHTML() {
String html = "<iframe width=\"100%\" height=\"100%\" src=\"https://www.youtube.com/embed/hEFqVV5q44E?rel=0&controls=0&showinfo=0\" frameborder=\"0\" allowfullscreen></iframe>";
return html;
}
}
我到底在做什么错了?
我还尝试使用WebViewFragment用getWebView替换wv,但问题仍然存在
I also tryied to use a WebViewFragment replacing wv with getWebView but the problem still remain
谢谢您的帮助
推荐答案
我发现了问题:
我还有另一个活动,该活动显示了嵌入youtube视频的WebView,并使其在关闭该活动时停止,而我正在使用finish方法中的这段代码
I had another Activity showing a WebView embedding a youtube video, and to make it stopping when closing the Activity I was using this code in the finish method
wv.clearHistory();
wv.clearCache(true);
wv.loadUrl("about:blank");
wv.pauseTimers();
wv = null;
避免使用此代码使该片段正常工作.我认为导致问题的真正代码是
avoiding this code made the fragment working. I think that the real code causing the problem was
wv.pauseTimers();
确认
经过一些测试,我可以确认真正的问题是
After some testing I can confirm that the real problem was
wv.pauseTimers();
删除该行,一切正常,使youtube视频停止播放此代码
removing this line everything works as expected, to make a youtube video stop playing this code works fine
wv.clearHistory();
wv.clearCache(true);
wv.loadUrl("about:blank");
wv = null;
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