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SlipButton——滑动开关
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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