Android 应用程序现在给我一个错误:
package com.martijngijselaar.rooster;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebviewActivity extends MainActivity {
private WebView myWebView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
WebView myWebView = (WebView)findViewById(R.id.webview);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.setWebViewClient(new WebViewClient());
myWebView.requestFocus(View.FOCUS_DOWN);
myWebView.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_UP:
if (!v.hasFocus()) {
v.requestFocus();
}
break;
}
return false;
}
});
}
public void onResume() {
super.onResume();
if ( isOnline() == true )
myWebView.loadUrl(webLink);
else if ( isOnline() == false )
showNoConnectionDialog();
}
}
这是logcat:
11-25 12:33:34.697:E/AndroidRuntime(494):致命异常:主要 11-25 12:33:34.697:E/AndroidRuntime(494):java.lang.RuntimeException:无法恢复活动 {com.martijngijselaar .rooster/com.martijngijselaar.rooster.WebviewActivity}: java.lang.NullPointerException 11-25 12:33:34.697: E/AndroidRuntime(494): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3128) 11- 25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3143) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app。 ActivityThread.handleLaunchActivity(ActivityThread.java:2684) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread.access$2300(ActivityThread.java:125) 11-25 12:33:34.697 : E/AndroidRuntime(494): 在 android.app.ActivityThread$H。handleMessage(ActivityThread.java:2033) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.os.Handler.dispatchMessage(Handler.java:99) 11-25 12:33:34.697: E/ AndroidRuntime(494): 在 android.os.Looper.loop(Looper.java:123) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread.main(ActivityThread.java:4627 ) 11-25 12:33:34.697: E/AndroidRuntime(494): at java.lang.reflect.Method.invokeNative(Native Method) 11-25 12:33:34.697: E/AndroidRuntime(494): at java. lang.reflect.Method.invoke(Method.java:521) 11-25 12:33:34.697: E/AndroidRuntime(494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868 ) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 11-25 12:33:34.697: E/AndroidRuntime(494 ):在达尔维克。system.NativeStart.main(Native Method) 11-25 12:33:34.697: E/AndroidRuntime(494): Caused by: java.lang.NullPointerException 11-25 12:33:34.697: E/AndroidRuntime(494): at com.martijngijselaar.rooster.WebviewActivity.onResume(WebviewActivity.java:46) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.Activity.performResume(Activity.java:3823) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread .performResumeActivity(ActivityThread.java:3118) 11-25 12:33:34.697: E/AndroidRuntime(494): ... 12 更多martijngijselaar.rooster.WebviewActivity.onResume(WebviewActivity.java:46) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149) 11-25 12: 33:34.697: E/AndroidRuntime(494): 在 android.app.Activity.performResume(Activity.java:3823) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread.performResumeActivity (ActivityThread.java:3118) 11-25 12:33:34.697: E/AndroidRuntime(494): ... 12 更多martijngijselaar.rooster.WebviewActivity.onResume(WebviewActivity.java:46) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149) 11-25 12: 33:34.697: E/AndroidRuntime(494): 在 android.app.Activity.performResume(Activity.java:3823) 11-25 12:33:34.697: E/AndroidRuntime(494): 在 android.app.ActivityThread.performResumeActivity (ActivityThread.java:3118) 11-25 12:33:34.697: E/AndroidRuntime(494): ... 12 更多在 android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118) 11-25 12:33:34.697: E/AndroidRuntime(494): ... 12 更多在 android.app.ActivityThread.performResumeActivity(ActivityThread.java:3118) 11-25 12:33:34.697: E/AndroidRuntime(494): ... 12 更多
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