Android - 在布局 XML 中使用自定义 SurfaceView

Question

我有这个简单的布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

            <SurfaceView
                android:id="@+id/surfaceView1"
                android:layout_width="fill_parent"
                android:layout_height="0dp" 
                android:layout_weight = "1" />

            <LinearLayout
                android:id="@+id/linearLayout1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <Button
                    android:id="@+id/button1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="button1" />
                <Button
                    android:id="@+id/button2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="button2" />
            </LinearLayout>
</LinearLayout>

这符合要求，应用程序运行完美。我想用我自己的自定义 SurfaceView 替换通用 SurfaceView:

import android.content.Context;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class PuzzleView extends SurfaceView implements SurfaceHolder.Callback {

    public PuzzleView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub  
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub  
    }
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
    }
}

并在布局 xml 中使用它:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

                <PuzzleView
                    android:id="@+id/surfaceView1"
                    android:layout_width="fill_parent"
                    android:layout_height="0dp" 
                    android:layout_weight = "1" />
.
.
.

Activity 一创建，我就得到一个异常:

public class MyActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.game);
    }

10-29 19:56:25.921: E/AndroidRuntime(287): java.lang.RuntimeException: Unable to start activity ComponentInfo{ybz.pack1/ybz.pack1.MyActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class PuzzleView

这是不允许的。我找不到任何这样做的例子。

编辑:
除了下面给出的解决方案外，还需要将 SurfaceView 的所有构造函数添加到 PuzzleView 中:

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

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

Answer 1

在您的 xml 布局中，您还必须像这样编写包(在其中声明您的类):

<com.your.package.here.PuzzleView
                    android:id="@+id/surfaceView1"
                    android:layout_width="fill_parent"
                    android:layout_height="0dp" 
                    android:layout_weight = "1" />