android之View的启动过程
程序里调用了onSizeChanged方法进行了一些设置,不知道onSizeChanged是在什么时候启动的,所以研究了一下View的启动流程代码如下:
[java] view plaincopyprint?
public class TestView extends View {
public TestView(Context context) {
super(context);
Log.d("mDebug", "TestView context");
}
public TestView(Context context, AttributeSet attrs) {
super(context, attrs);
Log.d("mDebug", "TestView context, attrs="+attrs.getAttributeValue(0));
}
public TestView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
Log.d("mDebug", "TestView context,attrs,defStyle attrs="+attrs.getAttributeValue(0));
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Log.d("mDebug", "onDraw");
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
Log.d("mDebug", "onFinishInflate");
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
Log.d("mDebug", "onSizeChanged,w="+w+",h="+h+",oldw="+oldw+",oldh="+oldh);
}
}
输出如下:http://www.
[java] view plaincopyprint?
22:23:03.587: D/mDebug(9715): TestView context, attrs=@2131034112
22:23:03.597: D/mDebug(9715): onFinishInflate
22:23:03.667: D/mDebug(9715): onSizeChanged,w=720,h=1080,oldw=0,oldh=0
22:23:03.727: D/mDebug(9715): onDraw
22:23:03.757: D/mDebug(9715): onDraw
很显然,onSizeChanged的启动时间在onDraw之前
android培训咨询:http://www.