View中有许多方法，比如：onFinishInflate,onSizeChanged,onDraw等，看下面程序：
public class TestView extends View {
public TestView(Context context) {
super(context);
Log.d("mDebug", "TestView context");
}
public TestView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
Log.d("mDebug", "TestView context,attrs,defStyle attrs="+attrs.getAttributeValue(0));
}
public TestView(Context context, AttributeSet attrs) {
super(context, attrs);
Log.d("mDebug", "TestView context, attrs="+attrs.getAttributeValue(0));
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
Log.d("mDebug", "onDraw");
}
@Override
protected void onFinishInflate() {
// TODO Auto-generated method stub
super.onFinishInflate();
Log.d("mDebug", "onFinishInflate");
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
// TODO Auto-generated method stub
super.onSizeChanged(w, h, oldw, oldh);
Log.d("mDebug", "onSizeChanged,w="+w+",h="+h+",oldw="+oldw+",oldh="+oldh);
}
}执行结果如下：
12-05 22:23:03.587: D/mDebug(9715): TestView context, attrs=@2131034112
12-05 22:23:03.597: D/mDebug(9715): onFinishInflate
12-05 22:23:03.667: D/mDebug(9715): onSizeChanged,w=240,h=282,oldw=0,oldh=0
12-05 22:23:03.727: D/mDebug(9715): onDraw
12-05 22:23:03.757: D/mDebug(9715): onDraw可以看到先执行构造函数，然后解析xml文件，尺寸变化函数，最后执行onDraw函数绘制UI界面。下面是View构造函数的研究：一般有三个构造函数：
public void CustomView(Context context){} public void CustomView(Context context,AttributeSet attrs){} public void CustomView(Context context,AttributeSet attrs,int defStyle){}
下面转载自网页
