Android随笔

学习绘图软件


 * Created by Jay on 2015/10/15 0015.
 */
public class MyView extends View{

    private Paint mPaint;


    public MyView(Context context) {
        super(context);
        init();
    }

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

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

    private void init(){
        mPaint = new Paint();
        mPaint.setAntiAlias(true);          //抗锯齿
        mPaint.setColor(getResources().getColor(R.color.puple));//画笔颜色
        mPaint.setStyle(Paint.Style.FILL);  //画笔风格
        mPaint.setTextSize(36);             //绘制文字大小，单位px
        mPaint.setStrokeWidth(5);           //画笔粗细
    }
    
    //重写该方法，在这里绘图
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }
    
}

然后布局那里设置下这个View就好，下述代码都写在onDrawable中~

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1）设置画布颜色：

canvas.drawColor(getResources().getColor(R.color.yellow));   //设置画布背景颜色

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2）绘制圆形：

canvas.drawCircle(200, 200, 100, mPaint);           //画实心圆