Android --------- 自定义VIew

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package com.example.coustomviewdemo;import android.R.interpolator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.FontMetrics;import android.util.AttributeSet;import android.view.View;public class FightViewDemo extends View {public FightViewDemo(Context context) {super(context);// TODO Auto-generated constructor stubinit(context,null);}public FightViewDemo(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinit( context,  attrs);}public FightViewDemo(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);// TODO Auto-generated constructor stubinit( context,  attrs);}private Paint paint;private void init(Context context, AttributeSet attrs){paint = new Paint();paint.setColor(Color.RED);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);//TODO 绘制文本//整个父控件 getHeight int height = getHeight();//整个父控件 getWidthint width = getWidth();//如何获取组件自身的高度和宽度？String text = "LoveHellOWorld";FontMetrics metrics = paint.getFontMetrics();int descent = (int)metrics.descent;//初始化 widths 长度为 text文本的字符的大小。float[] widths = new float[text.length()];//获取一哥字符串 每一个字符的像素宽度。paint.getTextWidths(text, widths);//获取自身组件的长度int myWidth=0;for(int i=0;i<widths.length;i++){myWidth+=widths[i];}//获取自身组件的高度int th = (int)paint.getTextSize();int posX =(width-myWidth)/2;int posY = height/2 + th/2 - descent;//话自己的文本内容：canvas.drawText(text, posX, posY, paint);//标准linecanvas.drawLine(0, height/2, width, height/2, paint);canvas.drawLine(width/2, 0, width/2, height, paint);}}
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