Hi i'm making an android Web View app but i have error.
how can i fix this error??
please help me.
WebView myWebView;
private MyWebChromeClient mWebChromeClient = null;
private View mCustomView;
private RelativeLayout mContentView;
private FrameLayout mCustomViewContainer;
private WebChromeClient.CustomViewCallback mCustomViewCallback;
FrameLayout.LayoutParams LayoutParameters = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.MATCH_PARENT);
...
private class MyWebChromeClient extends WebChromeClient {
public void onHideCustomView() {
if (mCustomView == null) {
return;
} else {
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN,WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
// Hide the custom view.
mCustomView.setVisibility(View.GONE);
// Remove the custom view from its container.
mCustomViewContainer.removeView(mCustomView);
mCustomView = null;
mCustomViewContainer.setVisibility(View.GONE);
mCustomViewCallback.onCustomViewHidden();
// Show the content view.
mContentView.setVisibility(View.VISIBLE);
super.onHideCustomView();
}
}
}
public boolean onKeyDown(int key, KeyEvent event) {
if ((mCustomViewContainer != null)&&(key == KeyEvent.KEYCODE_BACK)) {
mWebChromeClient.onHideCustomView();
return true;
}
else if((key == KeyEvent.KEYCODE_BACK)&&myWebView.canGoBack()){
myWebView.goBack();
return true;
}
return super.onKeyDown(key, event);
}
Log Cat
11-12 19:30:56.175 20071-20085/com.bayabro.bayabro V/MediaPlayer﹕ callback application
11-12 19:30:56.175 20071-20085/com.bayabro.bayabro V/MediaPlayer﹕ back from callback
11-12 19:30:56.670 20071-20071/com.bayabro.bayabro D/AndroidRuntime﹕ Shutting down VM
11-12 19:30:56.670 20071-20071/com.bayabro.bayabro W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x416992a0)
11-12 19:30:56.670 20071-20071/com.bayabro.bayabro E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.bayabro.bayabro.MyActivity.onKeyDown(MyActivity.java:169)
at android.view.KeyEvent.dispatch(KeyEvent.java:2705)
at android.app.Activity.dispatchKeyEvent(Activity.java:2431)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2028)
at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3852)
at android.view.ViewRootImpl.handleImeFinishedEvent(ViewRootImpl.java:3800)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:2935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4921)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
at dalvik.system.NativeStart.main(Native Method)
11-12 19:30:57.175 20071-20086/com.bayabro.bayabro V/MediaPlayer﹕ message received msg=3, ext1=63, ext2=0
myWebView is never initialized therefor is null at &&myWebView.canGoBack().
Make sure you initialize myWebView by calling myWebView = (WebView) findViewById(R.id.webview)
To avoid NPE:
else if(myWebView != null && key == KeyEvent.KEYCODE_BACK && myWebView.canGoBack()){
myWebView.goBack();
return true;
}
この記事はインターネットから収集されたものであり、転載の際にはソースを示してください。
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