我在support-v7-r18中使用ActionBarCompat.
当试图显示不确定的进度时,它适用于Galaxy S3 Android 4.1.2,但不适用于Galaxy Ace Android 2.3.3.
当试图显示不确定的进度时,它适用于Galaxy S3 Android 4.1.2,但不适用于Galaxy Ace Android 2.3.3.
我无法理解为什么.
提出异常的代码：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
final ActionBarActivity activity = this;
content = (WebView) findViewById(R.id.webContent);
content.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view,String url,Bitmap favicon) {
super.onPageStarted(view,url,favicon);
activity.setSupportProgressBarIndeterminate(true); <=== Line 88
activity.setSupportProgressBarIndeterminateVisibility(true);
}
}
例外：
FATAL EXCEPTION: main
java.lang.NullPointerException
at android.support.v7.app.ActionBarActivityDelegateBase.updateProgressBars(ActionBarActivityDelegateBase.java:508)
at android.support.v7.app.ActionBarActivityDelegateBase.setSupportProgressBarIndeterminate(ActionBarActivityDelegateBase.java:469)
at android.support.v7.app.ActionBarActivity.setSupportProgressBarIndeterminate(ActionBarActivity.java:282)
at MyActivity.onPageStarted(MyActivityActivity.java:88)
at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:266)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
