Android圆弧形ListView的实现

本文带大家来实现ListView的圆弧形的分布排列，原理非常easy，就是依据ListView的每个Item的高度来对每个item进行偏移。

首先自己定义一个LinearLayout，这是ListView的每一个Item的根布局，用来对每一个item进行偏移的。

以下上代码：

public class MatrixLinearLayout extends LinearLayout {
    private int h = 0;
    private float fullTrans = 40f;
    public MatrixView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setParentHeight(int height) {<pre name="code" class="java">        //传入ListView的高度
        h = height;
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.save();
        int top = getTop();
        float trans = calculatetrans(top,h);
        Matrix m = canvas.getMatrix();
        m.preTranslate(-2 / getWidth(), -2 / getHeight());
        m.postTranslate(trans, 0);
        canvas.concat(m);
        super.dispatchDraw(canvas);
        canvas.restore();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
    private float calculatetrans(int top,int h){
    	float result = 0f;
    	if(top <= h/2.349f){
    		result = (h/2f-top)/(h/7f)*fullTrans;
    	}else if(top > h/2.349f){
    		result = (top-h/3f)/(h/7f)*fullTrans;
    	}
    	return result;
    }
}