SlipButton——滑动开关

来源：互联网发布：网页动画制作软件编辑：程序博客网时间：2024/04/30 06:05
import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;/** * 滑动开关 * 备注：解决初始状态bug --1130 */public class SlipButton extends View implements OnTouchListener{    private boolean IsOpen;//记录当前按钮是否打开,true为打开,flase为关闭 做了点修改     private boolean OnSlip = false;//记录用户是否在滑动的变量      private float DownX, NowX;//按下时的x,当前的x,      private Rect Btn_On, Btn_Off;//打开和关闭状态下,游标的Rect      private boolean isChgLsnOn = false;    private OnChangedListener chgLsn;    private Bitmap bg_on, bg_off, slip_btn;    public SlipButton(Context context)    {        super(context);        init();    }    public SlipButton(Context context, AttributeSet attrs)    {        super(context, attrs);        init();    }    private void init()    {//初始化       //载入图片资源          bg_on = BitmapFactory.decodeResource(getResources(),                R.drawable.split_left_1);        bg_off = BitmapFactory.decodeResource(getResources(),                R.drawable.split_right_1);        slip_btn = BitmapFactory.decodeResource(getResources(),                R.drawable.split_1);        Btn_On = new Rect(0, 0, slip_btn.getWidth(), slip_btn.getHeight());        Btn_Off = new Rect(bg_off.getWidth() - slip_btn.getWidth(), 0,                bg_off.getWidth(), slip_btn.getHeight());        setOnTouchListener(this);// 设置监听器,也可以直接复写OnTouchEvent    }    @Override    protected void onDraw(Canvas canvas)    {        //绘图函数          super.onDraw(canvas);        Matrix matrix = new Matrix();        Paint paint = new Paint();        float x;        //根据设置判断初始状态        if (IsOpen)        {            NowX = bg_on.getWidth();        }        else        {            NowX = 0;        }        {            if (NowX < (bg_on.getWidth() / 2))//滑动到前半段与后半段的背景不同,在此做判断              {                canvas.drawBitmap(bg_off, matrix, paint);//画出关闭时的背景              }            else            {                canvas.drawBitmap(bg_on, matrix, paint);//画出打开时的背景              }            if (OnSlip)//是否是在滑动状态,              {                if (NowX >= bg_on.getWidth())//是否划出指定范围,不能让游标跑到外头,必须做这个判断                  {                    x = bg_on.getWidth() - slip_btn.getWidth() / 2;//减去游标1/2的长度...                  }                else                {                    x = NowX - slip_btn.getWidth() / 2;                }            }            else            {//非滑动状态                  if (IsOpen)//根据现在的开关状态设置画游标的位置                  {                    x = Btn_Off.left;                }                else                {                    x = Btn_On.left;                }            }            if (x < 0)//对游标位置进行异常判断...              {                x = 0;            }            else if (x > bg_on.getWidth() - slip_btn.getWidth())            {                x = bg_on.getWidth() - slip_btn.getWidth();            }            canvas.drawBitmap(slip_btn, x, 0, paint);//画出游标.          }    }    @Override    public boolean onTouch(View v, MotionEvent event)    {        switch (event.getAction())        //根据动作来执行代码          {            case MotionEvent.ACTION_MOVE://滑动                  NowX = event.getX();                break;            case MotionEvent.ACTION_DOWN://按下                  if (event.getX() > bg_on.getWidth()                        || event.getY() > bg_on.getHeight())                {                    return false;                }                OnSlip = true;                DownX = event.getX();                NowX = DownX;                break;            case MotionEvent.ACTION_UP://松开                  OnSlip = false;                boolean LastChoose = IsOpen;                if (event.getX() >= (bg_on.getWidth() / 2))                {                    IsOpen = true;                }                else                {                    IsOpen = false;                }                if (isChgLsnOn && (LastChoose != IsOpen))//如果设置了监听器,就调用其方法..                  {                    chgLsn.onChanged(IsOpen, this);                }                break;            default:        }        invalidate();//重画控件          return true;    }    public void setOnChangedListener(OnChangedListener l)    {//设置监听器,当状态修改的时候          isChgLsnOn = true;        chgLsn = l;    }    public void setCheck(boolean isCheck)    {        IsOpen = isCheck;        invalidate();    }    public interface OnChangedListener    {        abstract void onChanged(boolean checkState, View v);    }}
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