android之View的启动过程

转自：http://www.cdtarena.com/gpx/201308/9607.html

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:

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");
    }

  成都安卓培训、成都android培训

    @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.cdtarena.com/net.html

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