[英]Extending Fragment: MainActivity is not an enclosing class when adding JavacriptInterface
當我嘗試將addJavascriptInterface
到擴展的Fragment類內的Webview時,出現MainActivity is not an enclosing class
的錯誤:
mXWalkView.addJavascriptInterface(new MainActivity.JS_Bind(this, mXWalkView),"Android");
在我的MainActivity中,我在onCreate方法中采用了這種方式:
mXWalkView.addJavascriptInterface(new JS_Bind(this, mXWalkView),"Android");
JS_Bind是MainActivity內部的一個公共類:
public class JS_Bind {
private static final String TAG = "JS_Bind";
private Context context;
private XWalkView mXWalkView;
public JS_Bind(Context c, XWalkView mXWalkView) {
context = c;
this.mXWalkView = mXWalkView;
}
@org.xwalk.core.JavascriptInterface
public void makeToast(String toast) {
Toast mToast = Toast.makeText(context, toast, Toast.LENGTH_SHORT);
mToast.setGravity(Gravity.CENTER, 0, 0);
mToast.show();
}
}
注意:我也使用Crosswalk (一個Webview庫)。 我該如何解決該錯誤,它的確切含義是什么? 我讀過類似的問題和答案,但聽不懂。
編輯: Fragment
類:
public class SlideFragment extends Fragment {
private XWalkView mXWalkView;
private Context c;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_demo, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
int position = FragmentPagerItem.getPosition(getArguments());
XWalkPreferences.setValue(XWalkPreferences.REMOTE_DEBUGGING, true);
mXWalkView.addJavascriptInterface(new MainActivity.JS_Bind(this, mXWalkView),"Android");
mXWalkView = (XWalkView) view.findViewById (R.id.webView);
mXWalkView.clearCache(true);
mXWalkView.load(MainActivity.ROOT + "?s=" + getArguments().getString("title") + ".php?page=" + position, null);
Fragment
不能將this
用作Context
因為Fragment
不會擴展Context
。 在調用JS_Bind
的構造函數時,請改用getActivity()
或getContext()
。
編輯
mXWalkView.addJavascriptInterface(new MainActivity.JS_Bind(getActivity(),
mXWalkView), "Android");
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