Android进度条出现异常
我正在使用Android中的web视图，我尝试添加进度条，以下是我的代码：
case R.id.studentsite:
getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.webview);
WebView wv1 = (WebView)findViewById(R.id.webview);
WebSettings ws1 = wv1.getSettings();
final Activity activity = this;
wv1.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.setProgress(progress * 1000);
}
});
wv1.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
}
});
wv1.getSettings().setBuiltInZoomControls(true);
ws1.setJavaScriptEnabled(true);
wv1.setWebViewClient(new WebViewClient());
wv1.loadUrl("http://www.studentsite.gunadarma.ac.id");
break;问题是我在LOGCAT上得到了一个异常，如下所示：
09-17 13:51:34.487: ERROR/AndroidRuntime(1331): FATAL EXCEPTION: main 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): android.util.AndroidRuntimeException: requestFeature() must be called before adding content 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:181) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at com.ugsimplify.ugweb.callintent(ugweb.java:89) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at com.ugsimplify.ugweb$1.onClick(ugweb.java:29) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.view.View.performClick(View.java:2485) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.widget.CompoundButton.performClick(CompoundButton.java:99) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.view.View$PerformClick.run(View.java:9080) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.os.Handler.handleCallback(Handler.java:587) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.os.Handler.dispatchMessage(Handler.java:92) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.os.Looper.loop(Looper.java:123) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at android.app.ActivityThread.main(ActivityThread.java:3647) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at java.lang.reflect.Method.invokeNative(Native Method) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at java.lang.reflect.Method.invoke(Method.java:507) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 09-17 13:51:34.487: ERROR/AndroidRuntime(1331): at dalvik.system.NativeStart.main(Native Method)
你知道怎么修复它吗？谢谢。
回答 3
Stack Overflow用户
发布于 2012-09-17 15:06:09
紧跟在super.oncreate之后，在Oncreate中的行下调用
getWindow().requestFeature(Window.FEATURE_PROGRESS);你在Button click中调用它，你已经为它设置了一个内容。进度条功能只能在第一次请求setContentView之前请求。
Stack Overflow用户
发布于 2012-09-17 15:05:50
Hi Here is problem that you have call.
getWindow().requestFeature(Window.FEATURE_PROGRESS); before setContentView(R.layout.webview);
It should be call below the setContentView(R.layout.webview);
Answer :-
setContentView(R.layout.webview);
getWindow().requestFeature(Window.FEATURE_PROGRESS);Stack Overflow用户
发布于 2012-09-17 15:06:43
根据logcat，您在设置contentView之后使用了requestFeature。
你所发布的代码部分是完美的。
我怀疑您已经在其他地方使用过setContentView，可能是在onCreate方法中。
https://stackoverflow.com/questions/12454402
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