1. 定义属性

2. 继承View ： CustomTextView.java

 

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Rect;import android.util.AttributeSet;import android.util.Log;import android.widget.TextView;/** * TODO: document your custom TextView class. */public class CustomTextView extends TextView {    private static final String TAG = CustomTextView.class.getSimpleName();    private Bitmap bitmap;    public CustomTextView(Context context) {        super(context);    }    public CustomTextView(Context context, AttributeSet attrs) {        this(context, attrs, R.attr.CustomizeStyle);    }    public CustomTextView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.icon_textview);        int rsid = a.getResourceId(R.styleable.icon_textview_iconSrc,0);        if (rsid>0) {            bitmap = BitmapFactory.decodeResource(getResources(), rsid);        }        a.recycle();    }    @Override    protected void onDraw(Canvas canvas) {        RectBitmap(canvas);        super.onDraw(canvas);    }    public void RectBitmap(Canvas canvas) {        if (bitmap != null) {            //是否对原图片进行裁切            Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());            //显示在什么地方            Rect taget = new Rect();            //起点x的坐标            taget.left=0;            //起点Y的坐标：当前View的高度-字体实际占用的高度)/2 能保证图片与文字对齐            taget.top=(int)(getMeasuredHeight()-getTextSize())/2+1;//            System.out.println("getMeasuredHeight:"+getMeasuredHeight());//            System.out.println("getTextSize:"+getTextSize());            //保证图片等比缩放：X的坐标            taget.right = (int)(getTextSize() * (bitmap.getWidth() / (float)bitmap.getHeight()));            //Y的坐标            taget.bottom= (int) (taget.top+getTextSize());            canvas.drawBitmap(bitmap, rect, taget, getPaint());            canvas.translate(taget.right+2 , 0.5f);        }    }}

3：布局文件