package com.ewebapps;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.View;
public class Dot extends View {
private final float x;
private final float y;
private final int r;
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mWhite = new Paint(Paint.ANTI_ALIAS_FLAG);
public Dot(Context context, float x, float y, int r) {
super(context);
mPaint.setColor(0xFF000000); //Black
mWhite.setColor(0xFFFFFFFF); //White
this.x = x;
this.y = y;
this.r = r;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawCircle(x, y, r+2, mWhite); //White stroke.
canvas.drawCircle(x, y, r, mPaint); //Black circle.
}
}
问问题
1870 次
3 回答
1
好吧...在创建自己的视图时,最好的方法是覆盖该dispatchTouchEvent
方法。相信我,在某些情况下使用setOnTouchListener
并onTouchEvent
不能很好地工作。这就是你在你的View
:
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
// put your logic here
return super.dispatchTouchEvent(event);
}
于 2010-11-02T01:26:45.223 回答
0
Aaron Saunders 的答案适用于视图(如按钮),因为 onTouchListener 只告诉您单击了哪个视图,而不是确切的位置。如果您需要在不创建按钮的情况下确切知道事件的位置,请在您的活动类中尝试以下操作:
@Override
onTouchEvent(MotionEvent event) {
int _x = event.getX();
int _y = event.getY();
// do stuff
}
注意:onTouchEvent 仅在事件未由视图处理时调用。
文档
(有人可以告诉我如何添加换行符吗?)
于 2010-11-02T01:16:33.760 回答