使用Android时，当我使用Web视图中的后退键时，会出现一个白色屏幕
我正在使用一个显示WebView的非常简单的活动，但是当我从Web视图返回到上一个活动时，会出现一个白色屏幕，并且我需要再次按下后退键才能成功。 有没有办法来防止这种情况？
Web活动Display_web.java：
public class Display_web extends Activity {
private WebView myWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
String refOeuvre = intent.getStringExtra("REFOEUVRE");
setContentView(R.layout.display_web);
myWebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setDomStorageEnabled(true);
myWebView.loadUrl(refOeuvre);
}
@Override
public void onBackPressed() {
if(myWebView!=null && myWebView.canGoBack())
myWebView.goBack();// if there is previous page open it
else
super.onBackPressed();//if there is no previous page, close app
}
}
xml文件display_web.xml：
<?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
我使用WebView和ListView调用新WebView的活动：
public class Display_alpha3 extends Activity {
public ListView mListOeuvres;
public WebView wikipediaCompo;
...... @Override保护无效onCreate（Bundle savedInstanceState）{super.onCreate（savedInstanceState）; 的setContentView（R.layout.display_alpha3）; Intent intent = getIntent（）; ...... mListOeuvres =（ListView）findViewById（R.id.list_oeuvres）;
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(Display_alpha3.this,
android.R.layout.simple_list_item_1, infoOeuvres);
wikipediaCompo = (WebView) findViewById(R.id.wikipediaCompo);
WebSettings.setJavaScriptEnabled(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setDomStorageEnabled(true);
wikipediaCompo.loadUrl(refCompo);
wikipediaCompo.setWebViewClient(new WebViewClient()
{
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
return false;
}
});
mListOeuvres.setAdapter(adapter);
mListOeuvres.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String pos = String.valueOf(parent.getItemAtPosition(position));
Intent i = new Intent(Display_alpha3.this, Display_web.class);
i.putExtra("REFOEUVRE", refYouTube[position]);
startActivity(i);
}
});
}
}
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