2019独角兽企业重金招聘Python工程师标准>>>

Canvas canvas = new Canvas(bitmap1);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(mask, 0f, 0f, paint);      

package com.k.gameview;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;public class GameView1 extends View implements Runnable {/* 声明Paint对象 */private Paint mPaint = null;public GameView1(Context context) {super(context);/* 构建对象 */mPaint = new Paint();/* 开启线程 */new Thread(this).start();}float arc;public void onDraw(Canvas canvas) {super.onDraw(canvas);if(arc>360)arc=0;/* 设置画布的颜色 */canvas.drawColor(Color.BLACK);/* 设置取消锯齿效果 */mPaint.setAntiAlias(true);mPaint.setAlpha(255);if(arc>200){mPaint.setColor(Color.YELLOW);}else{mPaint.setColor(Color.GREEN);}mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeWidth(5);RectF rf = new RectF(10, 10, 90, 140);canvas.drawRoundRect(rf, 10, 10, mPaint);mPaint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));mPaint.setAlpha(0);mPaint.setStyle(Paint.Style.FILL);canvas.drawArc(new RectF(-100, -75, 200, 225), 240, arc, true, mPaint);arc+=2.5;}// 触笔事件public boolean onTouchEvent(MotionEvent event) {return true;}// 按键按下事件public boolean onKeyDown(int keyCode, KeyEvent event) {return true;}// 按键弹起事件public boolean onKeyUp(int keyCode, KeyEvent event) {return false;}public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {return true;}public void run() {while (!Thread.currentThread().isInterrupted()) {try {Thread.sleep(100);} catch (InterruptedException e) {Thread.currentThread().interrupt();}// 使用postInvalidate可以直接在线程中更新界面
            postInvalidate();}}
}