뒤로 버튼이 작동하지 않고 null 포인터 예외가 발생하는 웹보기가 있습니다. 단일 활동을 사용하고로드 할 URL의 의도를 확인하고 있습니다. 링크를 여는 데는 모든 기능이 정상적으로 작동합니다. 뒤로 버튼은 webview에서 이전 페이지로 돌아 가지 않고 작업을 중단시킵니다.Android Webview - 뒤로 버튼이 작동하지 않습니다.
EDITTED : 아래의 코드 블록이 업데이트되었습니다. 어떤 도움을 주시면 감사하겠습니다
07-01 11:54:19.817: E/AndroidRuntime(10079): FATAL EXCEPTION: main
07-01 11:54:19.817: E/AndroidRuntime(10079): java.lang.NullPointerException
07-01 11:54:19.817: E/AndroidRuntime(10079): at com.app.browser.WebUrl.onBackPressed(WebUrl.java:70)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.app.Activity.onKeyUp(Activity.java:2163)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.view.KeyEvent.dispatch(KeyEvent.java:2651)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.app.Activity.dispatchKeyEvent(Activity.java:2393)
07-01 11:54:19.817: E/AndroidRuntime(10079): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1853)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3683)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.view.ViewRootImpl.handleImeFinishedEvent(ViewRootImpl.java:3653)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:2893)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.os.Handler.dispatchMessage(Handler.java:99)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.os.Looper.loop(Looper.java:137)
07-01 11:54:19.817: E/AndroidRuntime(10079): at android.app.ActivityThread.main(ActivityThread.java:5059)
07-01 11:54:19.817: E/AndroidRuntime(10079): at java.lang.reflect.Method.invokeNative(Native Method)
07-01 11:54:19.817: E/AndroidRuntime(10079): at java.lang.reflect.Method.invoke(Method.java:511)
07-01 11:54:19.817: E/AndroidRuntime(10079): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
07-01 11:54:19.817: E/AndroidRuntime(10079): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
07-01 11:54:19.817: E/AndroidRuntime(10079): at dalvik.system.NativeStart.main(Native Method)
: 아직도 널 포인터 예외를
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebUrl extends Activity {
WebView myWebview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview);
Bundle extras = getIntent().getExtras();
if(extras != null) {
String link = extras.getString("url");
WebView myWebview = (WebView) findViewById(R.id.webEngine);
myWebview.getSettings().setJavaScriptEnabled(true);
myWebview.getSettings().setSupportZoom(true) ;
myWebview.getSettings().setUseWideViewPort(true) ;
myWebview.getSettings().setLoadWithOverviewMode(true);
myWebview.getSettings().setBuiltInZoomControls(true);
myWebview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
myWebview.setScrollbarFadingEnabled(false);
// Load the URLs inside the WebView, not in the external web browser
myWebview.setWebViewClient(new WebViewClient());
if (savedInstanceState == null) {
// Load a page
myWebview.loadUrl(link);
}
}
}
@Override
public void onBackPressed() {
if(myWebview.canGoBack() == true) {
myWebview.goBack();
} else {
WebUrl.super.onBackPressed(); //Replace MyActivity With the name of your activity.
}
}
}
로그 캣 오류를 제공합니다.
감사합니다,
클래스로 'myWebview' 선언 가능 – Raghunandan