我在类中扩展了SurfaceView,如下所示:
MainActivity.java
public class MainActivity extends Activity implements OnTouchListener {
SurfaceTest mySurface;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.surface);
mySurface = (SurfaceTest) findViewById(R.layout.surface);
mySurface.setOnTouchListener(this);
}
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
// ... some code ...
return true;
}
public class SurfaceTest extends SurfaceView implements Runnable {
SurfaceHolder myHolder;
public SurfaceTest(Context context) {
super(context);
// TODO Auto-generated constructor stub
myHolder = getHolder();
}
public SurfaceTest(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
myHolder = getHolder();
}
public SurfaceTest(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
myHolder = getHolder();
}
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
if (!myHolder.getSurface().isValid()) {
continue;
}
Canvas canvas = myHolder.lockCanvas();
//...some code...
myHolder.unlockCanvasAndPost(canvas);
}
}
}
}
surface.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.testsurfaceview.MainActivity.SurfaceTest
android:id="@+id/surfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</FrameLayout>
我在此xml文件的图形布局中有错误
"The following classes could not be instantiated:
- com.example.testsurfaceview.MainActivity.SurfaceTest"
一个可行的解决方案是为SurfaceTest
类创建新类,然后在xml文件中使用com.example.testsurfaceview.SurfaceTest
。
但问题是我使用onTouch
事件中的大量信息,用于在run()
方法中绘制画布。这就是我在SurfaceTest
MainActivity
课程的原因
所以我现在有两个选择:
1)使xml适用于嵌套的SurfaceTest类
2)创建新的SurfaceTest类并使用Intent传递在onTouch
中获得的所有信息。
你有什么建议?
答案 0 :(得分:1)
在包中创建一个名为SurfaceTest
的其他类文件,然后将其添加到xml文件中。它肯定会奏效。将onDraw(Canvas canvas)
和onTouchEvent(MotionEvent event)
添加到Surface View class
。