Android之給ImageView加文字

import android.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.ImageView;

/** 
 * @author yangshuai
 * @version 建立時間：2015-8-25 下午5:58:48 
 * 類說明 :有文字的imageView
 */
public class DrawTextImageView extends ImageView {

    public DrawTextImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public DrawTextImageView (Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public DrawTextImageView (Context context) {
        super(context);
    }

    /**
     * 文字 
     */
    private String textString = "";

    /**
     * 文字大小
     */
    private float textSize = ;

    /**
     * 文字位置x
     */
    private float x = -;

    /**
     * 文字位置y
     */
    private float y = -;

    /**
     * 文字顔色
     */
    private int textColor = R.color.holo_red_light;

    /**
     * 文字線條粗細
     */
    private int textDrawStrokeWidth = ;

    /**
     * 
     */
    public void setDrawText(String string){
        textString = string;
        drawableStateChanged();
    }

    /**
     *  設定文字 
     */
    public void setDrawTextSize(float textSize){
        this.textSize = textSize;
        drawableStateChanged();
    }

    /**
     * 設定文字位置x，y
     */
    public void setDrawLocalXY(float x, float y){
        this.x = x;
        this.y = y;
        drawableStateChanged();
    }

    /**
     * 設定文字顔色
     */
    public void setDrawTextColorResourse(int textColor){
        this.textColor = textColor;
        drawableStateChanged();
    }

    /**
     * 設定文字粗細
     */
    public void setDrawTextStrokeWidth(int textDrawStrokeWidth){
        this.textDrawStrokeWidth = textDrawStrokeWidth;
        drawableStateChanged();
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (!textString.equals("")) {
            Paint paint = new Paint();
            paint.setColor(getResources().getColor(textColor));
            paint.setStrokeWidth(textDrawStrokeWidth);
            paint.setStyle(Paint.Style.FILL);
            paint.setTextSize(textSize);
            canvas.drawText(textString, x==- ? ( canvas.getWidth() - ( textSize * textString.length() ) ) : x, y == - ? ( canvas.getHeight() -  ) : y, paint);
        }


    }

}