我有一个 android 项目，我想在使用 webview 时处理片段中的后退按钮。当我使用 webView 并单击多个链接，然后单击返回时。它关闭应用程序。我怎样才能让它转到背面。到目前为止，我已经做了以下工作：
public class NewsFragment extends Fragment {
private ProgressDialog progressDialog;
private WebView myWebView ;
public NewsFragment()
{
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_news, container, false);
myWebView = (WebView) rootView.findViewById(R.id.mwl_Website);
myWebView.setWebViewClient(new WebViewClient());
myWebView.getSettings().setBuiltInZoomControls(true);
myWebView.requestFocusFromTouch();
myWebView.setVerticalScrollBarEnabled(true);
myWebView.setHorizontalScrollBarEnabled(true);
myWebView.setVerticalScrollBarEnabled(true);
myWebView.setHorizontalScrollBarEnabled(true);
myWebView.requestFocusFromTouch();
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.getSettings().setUseWideViewPort(true);
myWebView.getSettings().setLoadWithOverviewMode(true);
myWebView.addJavascriptInterface(new WebAppInterface(getActivity()), "Android");
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.loadUrl(getResources().getString(R.string.WEBSITE));
new LoadViewTask().execute();
rootView.setOnKeyListener(new View.OnKeyListener() {
@Override
public …我正在使用Android Studio.我用导航抽屉创建了一个新活动.但是,它显示了< - 而不是汉堡图标.
如何修改我的代码以更改< - 到汉堡图标????
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {@link #restoreActionBar()}. …