如何加上"进入返回]在web视图里面的片段的功能? [英] How to add "Go Back" function in WebView inside Fragment?
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问题描述
更新:解决了!问题是关系到我Viewpager没有的WebView。
我想添加一个返回功能,我的的WebView
这是一个片段
里面。但我无法弄清楚如何:
I'm trying to add a "Go Back" function to my WebView
which is inside a Fragment
. But I can't figure out how to:
public final class TestFragment extends Fragment {
static WebView mWeb;
private View mContentView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
mContentView = inflater.inflate(R.layout.webview, null);
mWeb = (WebView)mContentView.findViewById(R.id.webview);
WebSettings settings = mWeb.getSettings();
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(false);
mWeb.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mWeb.getSettings().setBuiltInZoomControls(false);
mWeb.loadUrl("myurl...");
mWeb.setOnKeyListener(new OnKeyListener(){
public boolean onKey(View v, int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
mWeb.goBack();
return true;
}
return false;
}
});
}
}
我也试过这样的:
I also tried something like:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
mWeb.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
另一种解决方案,但同样的问题:
Another solution but same problem:
@Override
public void onBackPressed()
{
if(webView.canGoBack())
webView.goBack();
else
super.onBackPressed();
}
任何想法如何得到这个工作?
Any ideas how to get this working?
推荐答案
其实你不能直接在片段里做。该 onBack pressed
可以在 FragmentActivity
覆盖。你可以做的是:
Actually you can not do directly inside the fragment. The onBackPressed
can be overridden in the FragmentActivity
. What you can do is:
- 重写
onBack pressed
的活动中。 - 当
onBack pressed
被调用,检查当前片段的实例显示了实例的WebView
。 - 如果是,请
片段
如果的WebView
可以回去了。 - 如果不是的话,叫
超
或任何你需要
- Override the
onBackPressed
inside the activity. - When the
onBackPressed
is called, check if the instance of the current fragment is the instance showing thewebview
. - If it is, ask the
fragment
if thewebview
can go back. - if it is not, call the
super
or whatever you need
编辑:
@Override
public void onBackPressed() {
Fragment webview = getSupportFragmentManager().findFragmentByTag("webview");
if (webview instanceof MyWebViewFragment) {
boolean goback = ((MyWebViewFragment)webview).canGoBack();
if (!goback)
super.onBackPressed();
}
}
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