android - Android：错误膨胀扩展类

Question

我知道你以前会看到这个问题。我知道我有:-)。但是，结合我发现的所有答案，我仍然得到膨胀类错误。我的布局有一个扩展的 webView，因为我希望能够左右滑动以加载上一个和下一个 html 页面。我包括了整个布局，因为我发现我找到的大多数答案都以某种抽象的方式提出了一个解决方案，它只处理 webView 而不是更大图片的一部分。希望当这个问题得到解答时，它也会帮助其他人获得更大的图景。

底部的滚动视图将包含按钮作为导航 html 页面的替代方式。视图 imageView2 将包含一个透明的标头，部分遮盖了底层的 webView。textView helloText 将显示章节标题。在我不得不扩展 webView 以处理左右滑动之前，我已经完成了所有这些工作。

这是布局xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <RelativeLayout
        android:id="@+id/relativeLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.8"
        android:orientation="vertical" >

        <com.example.test.MyWebView
            android:id="@+id/webView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true" />

        <View
            android:id="@+id/imageView2"
            android:layout_width="fill_parent"
            android:layout_height="50dp"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true" 
            android:background="#88FF0000"/>
    </RelativeLayout>

    <TextView
        android:id="@+id/helloText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.05"
        android:gravity="center_horizontal"
        android:text="Hello World" />

    <HorizontalScrollView
        android:id="@+id/horizontalScrollView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
            android:background="#0000FF" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:orientation="horizontal" >

             <Button
            android:id="@+id/button1"
            android:layout_width="110dp"
            android:layout_height="45dp"
            android:background="#00FF00" />

        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

这是代码：

package com.example.test;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MotionEvent;
import android.webkit.WebView;
import android.widget.Toast;

public class MainActivity extends Activity {

int currentPage = 2; // page number for current html file

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //get a pointer to the webview
    MyWebView webview = (MyWebView) findViewById(R.id.webView1);

    webview.getSettings().setUseWideViewPort(true); 
    webview.getSettings().setSupportZoom(true);
    webview.getSettings().setBuiltInZoomControls(true);

    // put html page in the webView
    webview.loadUrl("file:///android_asset/chapter" + currentPage + ".html");
}

public void changePage(int page) {

    Log.v("test", "change page to " + page);

    //get a pointer to the webview
    MyWebView webview = (MyWebView)findViewById(R.id.webView1);

    // put html page in the webView
    webview.loadUrl("file:///android_asset/chapter" + page + ".html");

    }

class MyWebView extends WebView {
     Context context;
     GestureDetector gd;

    public MyWebView(Context context, AttributeSet attrs) {
    super(context, attrs);

    this.context = context;
         gd = new GestureDetector(context, sogl);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return (gd.onTouchEvent(event) 
                || super.onTouchEvent(event));
    }

     GestureDetector.SimpleOnGestureListener sogl = new GestureDetector.SimpleOnGestureListener() {
      public boolean onDown(MotionEvent event) {
       return false;
      }
      public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
       if (event1.getRawX() > event2.getRawX() && StrictMath.abs(event1.getRawY()-event2.getRawY())<100) {
        show_toast("swipe left");
        currentPage += 1;
        if (currentPage >= 19) currentPage = 19;
        changePage(currentPage);
       } else if(event1.getRawX() < event2.getRawX() && StrictMath.abs(event1.getRawY()-event2.getRawY())<100){
        show_toast("swipe right");
        currentPage -= 1;
        if (currentPage <= 1) currentPage = 1;
        changePage(currentPage);
       } else {
         return false;
       }
    return true;
      }
     };

     void show_toast(final String text) {
      Toast t = Toast.makeText(context, text, Toast.LENGTH_SHORT);
      t.show();
     }
    }
}

实际错误如下：

java.lang.RuntimeException：无法启动活动 ComponentInfo{com.example.test/com.example.test.MainActivity}：android.view.InflateException：二进制 XML 文件第 15 行：膨胀类 com.example.test.MyWebView 时出错

在此先感谢您的帮助。非常感激。

吉格斯先生

根据要求完整的错误跟踪：

01-23 10:21:51.980: E/AndroidRuntime(29514): FATAL EXCEPTION: main
01-23 10:21:51.980: E/AndroidRuntime(29514): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.MainActivity}: android.view.InflateException: Binary XML file line #15: Error inflating class com.example.test.MyWebView
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.os.Looper.loop(Looper.java:137)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread.main(ActivityThread.java:4898)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at java.lang.reflect.Method.invokeNative(Native Method)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at java.lang.reflect.Method.invoke(Method.java:511)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at dalvik.system.NativeStart.main(Native Method)
01-23 10:21:51.980: E/AndroidRuntime(29514): Caused by: android.view.InflateException: Binary XML file line #15: Error inflating class com.example.test.MyWebView
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:698)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:308)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.Activity.setContentView(Activity.java:1924)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at com.example.test.MainActivity.onCreate(MainActivity.java:21)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.Activity.performCreate(Activity.java:5206)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
01-23 10:21:51.980: E/AndroidRuntime(29514):    ... 11 more
01-23 10:21:51.980: E/AndroidRuntime(29514): Caused by: java.lang.ClassNotFoundException: com.example.test.MyWebView
01-23 10:21:51.980: E/AndroidRuntime(29514):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.createView(LayoutInflater.java:552)
01-23 10:21:51.980: E/AndroidRuntime(29514):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
01-23 10:21:51.980: E/AndroidRuntime(29514):    ... 22 more

score 2 · Accepted Answer

确保在自定义 webview 类中添加所有这些构造函数。

    public CustomWebView(Context context) {
        super(context);
    }

    public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

并且不要忘记在带有完整包名的 xml 布局文件中使用这个 CustomWebView 类。

 <com.kittykitty.meowmeow.CustomWebView
                android:id="@+id/my_webview"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                />

score 1 · Accepted Answer

MyWebView类是类的内部MainActivity。Inflater 没有看到这个类。在不同的 .java 文件中制作您的 WebView。

您也可以尝试在布局文件中使用该名称<com.example.test.MainActivity.MyWebView/>，但我不确定。

score 1 · Accepted Answer

// try this way
1. Custom WebView Class
public class MyWebView extends WebView {
    Context context;
    GestureDetector gd;
    OnPageChangleListener listener;
    private int currentPage=1;
    private int startPageIndex;
    private int lastPageIndex;

    public MyWebView(Context context) {
        super(context);
       init(context);
    }

    public MyWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public MyWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    private void init(Context context){
        this.context = context;
        gd = new GestureDetector(context, sogl);
    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return (gd.onTouchEvent(event)
                || super.onTouchEvent(event));
    }

    public void setOnPageChangeListener(OnPageChangleListener listener){
        this.listener = listener;
    }

    public void setStartPageIndex(int startPageIndex){
        this.startPageIndex = startPageIndex;
    }

    public int getStartPageIndex(){
        currentPage = startPageIndex;
        return startPageIndex;
    }

    public int getLastPageIndex(){
        return lastPageIndex;
    }

    public void setLastPageIndex(int lastPageIndex){
        this.lastPageIndex = lastPageIndex;
    }
    GestureDetector.SimpleOnGestureListener sogl = new GestureDetector.SimpleOnGestureListener() {
        public boolean onDown(MotionEvent event) {
            return false;
        }
        public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
            if (event1.getRawX() > event2.getRawX() && StrictMath.abs(event1.getRawY()-event2.getRawY())<100) {
                currentPage += 1;
                if (currentPage > lastPageIndex){
                    currentPage = lastPageIndex;
                    show_toast("Last Page");
                }else{
                    show_toast("swipe left");
                    listener.onPageChange(currentPage);
                }
            } else if(event1.getRawX() < event2.getRawX() && StrictMath.abs(event1.getRawY()-event2.getRawY())<100){
                currentPage -= 1;
                if (currentPage < startPageIndex) {
                    currentPage = startPageIndex;
                    show_toast("First Page");
                }else{
                    show_toast("swipe right");
                    listener.onPageChange(currentPage);
                }
            } else {
                return false;
            }
            return true;
        }
    };

    void show_toast(final String text) {
        Toast t = Toast.makeText(context, text, Toast.LENGTH_SHORT);
        t.show();
    }

}

2. Custom Interface for you Custom WebView page change listener.
public interface OnPageChangleListener {
    public void onPageChange(int pageNo);
}

3. Use Custom WebView in your Activity.
 MyWebView myWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        myWebView = (MyWebView) findViewById(R.id.myWebView);
        myWebView.getSettings().setUseWideViewPort(true);
        myWebView.getSettings().setSupportZoom(true);
        myWebView.getSettings().setBuiltInZoomControls(true);
        myWebView.setStartPageIndex(2);
        myWebView.setLastPageIndex(4);
        myWebView.setOnPageChangeListener(new OnPageChangleListener() {
            @Override
            public void onPageChange(int pageNo) {
                System.out.println(String.valueOf(pageNo));
                myWebView.loadUrl("file:///android_asset/" + pageNo + ".html");
            }
        });

        myWebView.loadUrl("file:///android_asset/" + myWebView.getStartPageIndex() + ".html");

}
4.main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <com.example.Demo.MyWebView
        android:id="@+id/myWebView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

android - Android：错误膨胀扩展类

3 回答 3

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