该功能实现很简单,就是根据手指坐标位置在画板上画
public class ErinieShow extends RelativeLayout {
Context context;
RelativeLayout bg;
MyView MyView;
int level;
public ErinieShow(Context context, int level) {
super(context);
this.context = context;
this.level = level;
bg = new RelativeLayout(context);
MyView = new MyView(context);
bg.addView(MyView);
addView(bg);
int[] resolution = PhoneUtil.getResolution(context);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
resolution[0], PhoneUtil.getFitHeight(context, 125));
bg.setId(100001);
bg.setLayoutParams(params);
MyView.setLayoutParams(params);
switch (level) {
case 0:
bg.setBackgroundResource(R.drawable.rewardlevel0);
break;
case 1:
bg.setBackgroundResource(R.drawable.rewardlevel1);
break;
case 2:
bg.setBackgroundResource(R.drawable.rewardlevel2);
break;
default:
bg.setBackgroundResource(R.drawable.rewardlevel3);
break;
}
MyView.init(Color.parseColor("#d3d3d3"), 30, 10);
}
}
public class MyView extends TextView {
private float TOUCH_TOLERANCE; // 填充距离,使线条更自然,柔和,值越小,越柔和。
private Bitmap mBitmap;
private Canvas mCanvas;
private Paint mPaint;
private Path mPath;
private float mX, mY;
private boolean isDraw = false;
int time=0;
public MyView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (isDraw) {
mCanvas.drawPath(mPath, mPaint);
canvas.drawBitmap(mBitmap, 0, 0, null);
}
}
/**
* 开启檫除功能
*
* @param bgColor
* 覆盖的背景颜色
* @param paintStrokeWidth
* 触点(橡皮)宽度
* @param touchTolerance
* 填充距离,值越小,越柔和。
*/
public void init(final int bgColor, final int paintStrokeWidth,
float touchTolerance) {
TOUCH_TOLERANCE = touchTolerance;
// 设置画笔
mPaint = new Paint();
// mPaint.setAlpha(0);
// 画笔划过的痕迹就变成透明色了
mPaint.setColor(Color.BLACK); // 此处不能为透明色
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
// 或者
// mPaint.setAlpha(0);
// mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND); // 前圆角
mPaint.setStrokeCap(Paint.Cap.ROUND); // 后圆角
mPaint.setStrokeWidth(paintStrokeWidth); // 笔宽
// 痕迹
mPath = new Path();
// 覆盖
LayoutParams layoutParams = getLayoutParams();
int height = layoutParams.height;
int width;
if (getLayoutParams().width == LayoutParams.MATCH_PARENT) {
width = 700;
} else {
width = layoutParams.width;
}
mBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mCanvas.drawColor(bgColor);
isDraw = true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isDraw) {
return true;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: // 触点按下
// touchDown(event.getRawX(),event.getRawY());
touchDown(event.getX(), event.getY());
invalidate();
break;
case MotionEvent.ACTION_MOVE: // 触点移动
touchMove(event.getX(), event.getY());
invalidate();
break;
case MotionEvent.ACTION_UP: // 触点弹起
touchUp(event.getX(), event.getY());
invalidate();
break;
default:
break;
}
return true;
}
private void touchDown(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touchMove(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}
}
private void touchUp(float x, float y) {
mPath.lineTo(x, y);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
}
}