这是一个自定义view画圆，对于初学自定义view的小伙伴这是一个很好的帮助。
看图
代码：
代码语言：javascript复制package sjx.com.custonview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
/**
* dell 孙劲雄
* 2017/9/1
* 19:57
*/
public class Custonm extends View {
private float currentX = 40;
private float currentY = 50;
public Custonm(Context context) {
super(context);
}
public Custonm(Context context, AttributeSet attrs) {
super(context, attrs);
}
public Custonm(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
//测量
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
//摆放
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint=new Paint();
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.FILL);
paint.setAntiAlias(true);
canvas.drawCircle(currentX,currentY,30,paint);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
return super.dispatchTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
currentX=event.getX();
currentY=event.getY();
invalidate();
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
Log.i("sss", "按下");
break;
case MotionEvent.ACTION_MOVE:
Log.i("sss", "移动");
break;
case MotionEvent.ACTION_UP:
Log.i("sss", "弹起");
break;
}
return true;
}
}以上就是本文的全部内容，希望对大家的学习有所帮助。
