我在小型应用程序中遇到WebViews问题.我有相关的Web视图,其布局中包含正确的信息,并且我有直接来自Android开发者网站的示例代码,这些示例代码对我不起作用.

该错误是围绕：

findViewById(R.id.webview)方法.

具有事件监听器的类：

package com.bignerdranch.android.transitionexample;

import android.app.Fragment;

import android.os.Bundle;

import android.transition.Scene;

import android.transition.TransitionManager;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.webkit.JavascriptInterface;

import android.webkit.WebView;

import android.widget.Button;

import com.bignerdranch.android.transitionexample.R;

/**

* A placeholder fragment containing a simple view.

*/

public class TransitionFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

final View rootView = inflater.inflate(R.layout.fragment_transition_scene_1, container, false);

final Scene scene = Scene.getSceneForLayout(container, R.layout.fragment_transition_scene_2, getActivity());

Button goButton = (Button)rootView.findViewById(R.id.goButton);

goButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

TransitionManager.go(scene);

WebView myWebView = (WebView) findViewById(R.id.webview);

myWebView.loadUrl("http://www.example.com");

Log.d("","Loading Finished");

}

});

return rootView;

}

}

布局：

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/scene"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center_horizontal"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin"

tools:context="com.bignerdranch.android.transitionexample.TransitionFragment">

android:id="@+id/textView"

android:text="@string/hello_world"

android:layout_weight="1"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

android:text="@string/hello_world"

android:layout_weight="1"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/webview"

android:layout_width="fill_parent"

android:layout_height="@android:dimen/thumbnail_height"

android:layout_weight="1.43" />