android.view.WindowManager $ BadTokenException例外。任何指针？ [英] android.view.WindowManager$BadTokenException Exception. Any pointer?
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问题描述
我有两个webviews和切出两个webviews我创建了一个超类的超类的所有方法的通用功能，并用它在这两个webviews。
I have two webviews and to cut out the common functionality from both the webviews I created a super class with all methods in the super class and use it in the two webviews.
有一次，我创建的对象，从第一个web视图设置变量，web视图显示正常，当我preSS返回按钮，进入到第二的WebView我得到的folling例外。
Once when I create the object and set the variables from the 1st webview, the WebView displays properly and when I press the 'BACK' button and go to the 2nd WebView I get the folling exception.
任何帮助吗？
第一的WebView code
First WebView Code
public class firstWebView extends Activity {
private static final String LOG_TAG = "FirstWebView";
public static final int VIDEO_PLAY = 0;
private WebView mWebView;
private NicuWebView _nicuWebView;
private static final String URL = mainMenuActivity.urlSelected+"todo.html";
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.webview);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
mWebView = (WebView) findViewById(R.id.webview);
_nicuWebView = NicuWebView.getNicuWebView(mWebView);
// mWebView.setWebChromeClient(new MyWebChromeClient());
final Activity activity = this;
NicuWebView.setContext(activity);
setProgressBarVisibility(true);
int count = (int) _nicuWebView.loadUrl(URL);
Toast.makeText(this, "Count = "+count, Toast.LENGTH_SHORT).show();
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
// startActivity(new Intent(getApplication(), mainMenuActivity.class));
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
code代表第二类似于第一个，但该URL指向一个不同的HTML页面。
Code for Second is similar to the first one but the URL points to a different html page.
E/AndroidRuntime( 7913): android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@447d2a98 is not valid; is your activity running?
E/AndroidRuntime( 7913): at android.view.ViewRoot.setView(ViewRoot.java:468)
E/AndroidRuntime( 7913): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
E/AndroidRuntime( 7913): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
E/AndroidRuntime( 7913): at android.view.Window$LocalWindowManager.addView(Window.java:424)
E/AndroidRuntime( 7913): at android.app.Dialog.show(Dialog.java:239)
E/AndroidRuntime( 7913): at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
E/AndroidRuntime( 7913): at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:483)
E/AndroidRuntime( 7913): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 7913): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 7913): at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime( 7913): at java.lang.reflect.Method.invokeNative(NativeMethod)
E/AndroidRuntime( 7913): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 7913): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 7913): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime( 7913): at dalvik.system.NativeStart.main(Native Method)
$ C $下NicuWebView是
Code for NicuWebView is
public class NicuWebView {
private static NicuWebView _nicuWebView;
private static WebView _webView;
private static HashMap<String,Long> _urls;
private static Context contextName;
private static final int VIDEO_PLAY = 0;
private NicuWebView(WebView myWebView) {
_urls = new HashMap<String,Long>(10);
_webView = myWebView;
_webView.setWebViewClient(new NicuWebViewClient());
_webView.getSettings().setJavaScriptEnabled(true);
_webView.clearCache(true);
WebSettings webSettings = _webView.getSettings();
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(true);
_webView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");
_webView.clearCache(true);
_webView.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(contextName, "Super Class TOAST message", Toast.LENGTH_LONG).show();
}
@Override
public void onPageFinished(WebView view, String url)
{
_webView.loadUrl("javascript:(function () { " +
"setVariable("+mainMenuActivity.numberSelected+");" +
"})()");
}
});
_webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
// Activities and WebViews measure progress with different scales.
// The progress meter will automatically disappear when we reach 100%
((Activity) contextName).setProgress(progress * 1000);
}
});
_webView.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(contextName, "Oh no! " + description, Toast.LENGTH_SHORT).show();
}
@Override
public void onPageFinished(WebView view, String url) {
_webView.loadUrl("javascript:(function () { " +
"setVariable("+mainMenuActivity.numberSelected+");" +
"})()");
}
});
}
// allow clicking on link to remain in app instead of launching android browser
private class NicuWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
public static NicuWebView getNicuWebView(WebView myWebView){
if (_nicuWebView == null) _nicuWebView = new NicuWebView(myWebView);
return _nicuWebView;
}
// loads the requested URL and maintains a 'history' of pages visited.
// returns number of times page was loaded.
public long loadUrl(String url) {
long count = incrementCounter(url);
_webView.loadUrl(url);
return count;
}
//helper to
private static long incrementCounter(String url){
if (url != null) {
if (_urls.get(url)==null) _urls.put(url,new Long(0));
long count = _urls.put(url,_urls.get(url) +1L);
return count;
}
else {
Toast.makeText(contextName, "Null URL", Toast.LENGTH_SHORT).show();
return 0;
}
}
/// return the number of times the given URL has been visited
public long getUrlVisitCount(String url) {
if (_urls.get(url)==null) return 0L;
return _urls.get(url);
}
//returns to the previous URL, returns that URL
public String goBack(){
if (_webView.canGoBack()) _webView.goBack();
String url = _webView.getUrl();
incrementCounter(url);
return url;
}
//returns to next forward URL, returns that URL
public String goForward(){
if (_webView.canGoForward()) _webView.goForward();
String url = _webView.getUrl();
incrementCounter(url);
return url;
}
public static boolean setContext(Context context) {
contextName = context;
return true;
}
public Context getContext(){
if (contextName == null) return null;
return contextName;
}
final class DemoJavaScriptInterface {
public void setPlayVideo(String option) {
Toast.makeText(contextName, "Playing Video = "+option, Toast.LENGTH_SHORT).show();
Intent intent = new Intent ( contextName, playVideo.class );
((Activity) contextName).startActivityForResult(intent, VIDEO_PLAY);
}
}
public boolean canGoBack() {
return _webView.canGoBack();
}
}
推荐答案
问题是，对话需要有你的活动的基地的背景下，并不一定是一个你是从启动它。
The problem is that the dialog need to have the "base" context of your activity, not necessarily the one you're launching it from.
这里有一个解决方案，往往工作
Here's one solution which often works
Activity a = this;
while(a.getParent() != null) {
a = a.getParent();
}
_nicuWebView.setContext(a);
，看看有什么与此事情的一种方法是修改的例子如下：
One way to see what's going on with this is to modify that example as follows
Activity a = this;
while(a.getParent() != null) {
Log.i("ActivityTree",a.getClass().getSimpleName());
a = a.getParent();
}
_nicuWebView.setContext(a);
亚洲开发银行然后将显示你的，你在里面活动的层次结构。
adb will then show you the hierarchy of activities which you're inside.
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