Android自定义View实现球形动态加速球

本文实例为大家分享了Android自定义View实现球形动态加速球的具体代码，供大家参考，具体内容如下

利用贝塞尔曲线画波浪线封闭黄色矩形，使用PorterDuffXfermode的SRC_ATOP只显示圆和交叠部分，利用Handler发送消息模拟进度形成动态效果。

代码：

public class CircleView extends View{
private int width;
private int height;
private Bitmap mBitmap;
private Canvas canvasBit;
private Paint mPaintCircle;
private Paint mPaintline;
private int count;
private Path path;
private int progress;
private int Maxprogress;
public void setMaxprogress(int maxprogress) {
Maxprogress = maxprogress;
    }

public void setProgress(int progress) {
this.progress = progress;
    }

public int getCount() {
return count;
    }

public void setCount(int count) {
this.count = count;//贝塞尔曲线周期循环
        invalidate();
    }

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

public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaintCircle=new Paint();
mPaintCircle.setColor(Color.BLUE);
mPaintCircle.setAntiAlias(true);
mPaintCircle.setStyle(Paint.Style.FILL);

path=new Path();

mPaintline=new Paint();
mPaintline.setAntiAlias(true);
mPaintline.setStyle(Paint.Style.FILL);
mPaintline.setColor(Color.YELLOW);

    }

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width=  getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
height =getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width,height);
mBitmap=Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);
canvasBit=new Canvas(mBitmap);//新建bitmap的canvas
mPaintline.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));//显示圆和交叠的部分
    }

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
        canvas.drawColor(Color.BLACK);//背景色
canvasBit.drawCircle(300, 300, 150, mPaintCircle);
path.reset();
path.moveTo(500, progress);//矩形右边框到圆底部
path.lineTo(500, 500);//右边框
path.lineTo(count, 500);//下边框
path.lineTo(count, progress);//左边框
for (int i=0;i<10;i++){//循环形成10个周期的波浪封矩形上边框
path.rQuadTo(20,5,50,0);
path.rQuadTo(20,-5,50,0);
        }
canvasBit.drawPath(path, mPaintline);
        canvas.drawBitmap(mBitmap,0,0,null);
    }
}

//Handler代码如下

public class MainActivity extends Activity {
private CircleView circleView;
private int count;
private int progress=450;
private static final int START=0x23;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case START:
count++;
progress-=4.5;//圆直径450，按比例count 1=progress 4.5
if (count<=100){
circleView.setCount(count);
circleView.setProgress(progress);
handler.sendEmptyMessageDelayed(START,20);
                    }else {
count=0;
progress=450;
circleView.setProgress(progress);
circleView.setCount(count);
handler.sendEmptyMessageDelayed(START,20);
                    }
break;
            }
        }
    };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
circleView= (CircleView) findViewById(R.id.circleview);
handler.sendEmptyMessage(START);
    }
}

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