ContactSpan.java

package com.sogouchat.widget;

import java.lang.ref.WeakReference;

import com.sogouchat.bean.TelNode;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.style.ImageSpan;

public class ContactSpan extends ImageSpan {
    private Paint mPaint;
    private TelNode mTel;

	public ContactSpan(TelNode tel, Drawable d, int alignBaseline) {
		// TODO Auto-generated constructor stub
    	super(d, alignBaseline);
    	
    	mTel = tel;
        mPaint=new Paint();
        mPaint.setColor(Color.BLACK);
        mPaint.setTextSize(18);
	}

	@Override
    public void draw(Canvas canvas, CharSequence text,
                     int start, int end, float x, 
                     int top, int y, int bottom, Paint paint) {
        Drawable b = getCachedDrawable();

        canvas.save();
        int transY = bottom - b.getBounds().bottom;
        if (mVerticalAlignment == ALIGN_BASELINE) {
            transY -= paint.getFontMetricsInt().descent;
        }
        canvas.translate(x, transY);
        b.draw(canvas);
        float w = getStrWidth();
        float posX =  (b.getBounds().width() - w)/2;
        float posY = (b.getBounds().height() - mPaint.getFontMetricsInt().top)/2;
        canvas.drawText(mTel.mName,posX, posY,mPaint); 
        canvas.restore();
    }
    
    private Drawable getCachedDrawable() {
        WeakReference<Drawable> wr = mDrawableRef;
        Drawable d = null;

        if (wr != null)
            d = wr.get();

        if (d == null) {
            d = getDrawable();
            mDrawableRef = new WeakReference<Drawable>(d);
        }

        return d;
    }
    
    private WeakReference<Drawable> mDrawableRef;
    
    private float getStrWidth(){
    	float[] widths = new float[mTel.mName.length()];
        mPaint.getTextWidths(mTel.mName, widths);
        float w=0;
        for(int i=0;i < mTel.mName.length();i++){
        	w +=widths[i];
        }
        return w;
    }
}