Android：崩溃：二进制 XML 文件行：膨胀 class 时出错（使用 SurfaceView）

Question

我有 android surfaceView 并且我正在尝试为此添加按钮。 在surfaceView canvas 我画了一些东西。 我有一个线程 class 来继续绘图。

package com.androidsurfaceview;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class androidsurfaceview extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button buttonShowHide = (Button)findViewById(R.id.showhide);
        final Button buttonDummy = (Button)findViewById(R.id.dummy);

        buttonShowHide.setOnClickListener(
                new Button.OnClickListener(){

                    @Override
                    public void onClick(View arg0) {
                        // TODO Auto-generated method stub
                        if(buttonDummy.getVisibility()==View.VISIBLE){
                            buttonDummy.setVisibility(View.GONE);
                        }
                        else{
                            buttonDummy.setVisibility(View.VISIBLE);
                        }
                    }

                }
        );

螺纹class

package com.androidsurfaceview;

import android.graphics.Canvas;
import android.view.SurfaceHolder;
public class MySurfaceThread extends Thread {
    private SurfaceHolder myThreadSurfaceHolder;
    private com.androidsurfaceview.test.MySurfaceView  myThreadSurfaceView;
    private boolean myThreadRun = false;

    public MySurfaceThread(SurfaceHolder surfaceHolder, com.androidsurfaceview.test.MySurfaceView surfaceView) {
        myThreadSurfaceHolder = surfaceHolder;
        myThreadSurfaceView = surfaceView;
    }

    public void setRunning(boolean b) {
        myThreadRun = b;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(myThreadRun){
            Canvas c = null;

            try{
                c = myThreadSurfaceHolder.lockCanvas(null);
                synchronized (myThreadSurfaceHolder){
                    myThreadSurfaceView.onDraw(c);
                }
                sleep(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            finally{
                // do this in a finally so that if an exception is thrown
                // during the above, we don't leave the Surface in an
                // inconsistent state
                if (c != null) {
                    myThreadSurfaceHolder.unlockCanvasAndPost(c);
                }
            }
        }
    }
}

用于绘图的表面视图和 class

 package com.androidsurfaceview;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

 public class test extends Activity{

      //     ......
       //   I do a few things here... with this class test.

    public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{

        private MySurfaceThread thread;
        private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        int cx, cy, offx, offy;

        public MySurfaceView(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
            init();
        }

        public MySurfaceView(Context context, AttributeSet attrs) {
            super(context, attrs);
            // TODO Auto-generated constructor stub
            init();
        }

        public MySurfaceView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            // TODO Auto-generated constructor stub
            init();
        }

         private void init(){
              getHolder().addCallback(this);
              thread = new MySurfaceThread(getHolder(), this);

              setFocusable(true); // make sure we get key events

              paint.setStyle(Paint.Style.STROKE);
              paint.setStrokeWidth(3);
              paint.setColor(Color.WHITE);

              cx = 0;
              cy = 0;
              offx = 10;
              offy = 10;

             }

        @Override
        public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            thread.setRunning(true);
            thread.start();

        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            boolean retry = true;
            thread.setRunning(false);
            while (retry) {
                try {
                    thread.join();
                    retry = false;
                } 
                catch (InterruptedException e) {
                }
            }
        }
    ////Just a simple graphic of moving circle.
        @Override
        protected void onDraw(Canvas canvas) {
            // TODO Auto-generated method stub
            canvas.drawRGB(0, 0, 0);
            canvas.drawCircle(cx, cy, 3, paint);
            cx += offx;
            if (cx > getWidth() || (cx < 0)){
                offx *= -1;
                cx += offx;
            }

            cy += offy;
            if (cy > getHeight() || (cy < 0)){
                offy *= -1;
                cy += offy;
            }
        }
    }
    }

这里主要是xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<Button
    android:id="@+id/showhide"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Toggle The Another Button Show/Hide" />
<Button
    android:id="@+id/dummy"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="a Button" />
<FrameLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

<com.androidsurfaceview.test.MySurfaceView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

</FrameLayout>
</LinearLayout>

问题：上面的代码仅在我没有“MySurfaceView”作为嵌套 class 的情况下才有效。 但是对于外部 class “测试” ，我收到以下错误。 如果我删除“类测试”它工作正常。

错误/崩溃

04-29 11:43:18.977: ERROR/AndroidRuntime(21832): FATAL EXCEPTION: main
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidsurfaceview/com.androidsurfaceview.androidsurfaceview}: **android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView**
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.os.Looper.loop(Looper.java:123)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread.main(ActivityThread.java:4627)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at java.lang.reflect.Method.invokeNative(Native Method)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at java.lang.reflect.Method.invoke(Method.java:521)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at dalvik.system.NativeStart.main(Native Method)
**04-29 11:43:18.977: ERROR/AndroidRuntime(21832): Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView**
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:200)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.Activity.setContentView(Activity.java:1647)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at com.androidsurfaceview.androidsurfaceview.onCreate(androidsurfaceview.java:13)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

任何帮助都会很棒......我坚持这一点。

Answer 1

首先，您必须将您的视图声明为static类型，以便即使没有可用的 class 实例也可以对其进行膨胀：

public static class MySurfaceView extends SurfaceView 
    implements SurfaceHolder.Callback

线

<com.androidsurfaceview.test.MySurfaceView

in your layout xml suggests, that the MySurfaceView class is inside the com.androidsurfaceview.test package, and tries to inflate it from there, which is wrong.

在您的布局中，您应该遵循package.class$innerclass声明形式。

但是由于"$"是非法字符，你不能写

<com.androidsurfaceview.test$MySurfaceView

所以你必须在布局 xml 中指定你的视图，如下所示：

<view class="com.androidsurfaceview.test$MySurfaceView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

这样它就会起作用。