public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Fragment_view frag=new Fragment_view();
FragmentManager manager=getFragmentManager();
FragmentTransaction transaction=manager.beginTransaction();
transaction.add(R.id.fragment,frag,"hey");
transaction.commit();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (inCustomView()) {
hideCustomView();
return true;
}
if ((mCustomView == null) && webView.canGoBack()) {
webView.goBack();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
现在,像inCustomView和hidecustomView这样的变量在另一个片段中定义。因此,在使用片段中的变量时,如何在活动上添加此后退按钮支持。所以我基本上想在Android活动中实现后退按钮支持,同时使用片段中定义的变量。
public class Fragment_view extends Fragment{
private WebView webView;
private FrameLayout customViewContainer;
private WebChromeClient.CustomViewCallback customViewCallback;
private View mCustomView;
private myWebChromeClient mWebChromeClient;
private myWebViewClient mWebViewClient;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view= inflater.inflate(R.layout.fragment_view, container,false);
customViewContainer = (FrameLayout)view.findViewById(R.id.customViewContainer);
webView = (WebView)view. findViewById(R.id.webView);
mWebViewClient = new myWebViewClient();
webView.setWebViewClient(mWebViewClient);
mWebChromeClient = new myWebChromeClient();
webView.setWebChromeClient(mWebChromeClient);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setSaveFormData(true);
String htmlFile = "file:///" + Environment.getExternalStorageDirectory()
.getPath()
+ "/video_nsta/index.html";
webView.loadUrl(htmlFile);
return view;
}
public boolean inCustomView() {
return (mCustomView != null);
}
public void hideCustomView() {
mWebChromeClient.onHideCustomView();
}
@Override
public void onPause() {
super.onPause();
webView.onPause();
}
@Override
public void onResume() {
super.onResume();
webView.onResume();
}
@Override
public void onStop() {
super.onStop();
if (inCustomView()) {
hideCustomView();
}
}
class myWebChromeClient extends WebChromeClient {
@Override
public void onShowCustomView(View view, int requestedOrientation, CustomViewCallback callback) {
onShowCustomView(view, callback);
}
@Override
public void onShowCustomView(View view,CustomViewCallback callback) {
if (mCustomView != null) {
callback.onCustomViewHidden();
return;
}
mCustomView = view;
webView.setVisibility(View.GONE);
customViewContainer.setVisibility(View.VISIBLE);
customViewContainer.addView(view);
customViewCallback = callback;
}
@Override
public void onHideCustomView() {
super.onHideCustomView();
if (mCustomView == null)
return;
webView.setVisibility(View.VISIBLE);
customViewContainer.setVisibility(View.GONE);
mCustomView.setVisibility(View.GONE);
customViewContainer.removeView(mCustomView);
customViewCallback.onCustomViewHidden();
mCustomView = null;
}
}
class myWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return super.shouldOverrideUrlLoading(view, url);
}
}
}
答案 0 :(得分:0)
这是正确分发后退按钮的问题。
首先创建一个可以处理它的片段:
public abstract class BackButtonFragment extends Fragment{
public boolean onBackPressed(){
return false; // defaults to false
}
}
然后您将所有片段更改为从BackButtonFragment
扩展。
然后在您的活动中,您将使用适当的回拨功能(从您的活动中删除onKeyDown
并使用此代码):
@Override public void onBackPressed() {
Fragment f = getFragmentManager().findFragmentById(R.id.fragment);
if(f instanceof BackButtonFragment){
if(((BackButtonFragment)f).onBackPressed())
return;
}
// if fragment didn't use back button do the normal stuff
super.onBackPressed();
}
然后在每个片段中override
使用方法onBackPressed
并根据您的需要返回正确的值true
或false
。