滑动开关按钮.rar

package com.qing; 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; public class MySlipSwitch extends View implements OnTouchListener { //开关开启时的背景，关闭时的背景，滑动按钮 private Bitmap switch_on_Bkg, switch_off_Bkg, slip_Btn; private Rect on_Rect, off_Rect; //是否正在滑动 private boolean isSlipping = false; //当前开关状态，true为开启，false为关闭 private boolean isSwitchOn = false; //手指按下时的水平坐标X，当前的水平坐标X private float previousX, currentX; //开关监听器 private OnSwitchListener onSwitchListener; //是否设置了开关监听器 private boolean isSwitchListenerOn = false; public MySlipSwitch(Context context) { super(context); init(); } public MySlipSwitch(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init() { setOnTouchListener(this); } protected void setImageResource(int switchOnBkg, int switchOffBkg, int slipBtn) { switch_on_Bkg = BitmapFactory.decodeResource(getResources(), switchOnBkg); switch_off_Bkg = BitmapFactory.decodeResource(getResources(), switchOffBkg); slip_Btn = BitmapFactory.decodeResource(getResources(), slipBtn); //右半边Rect，即滑动按钮在右半边时表示开关开启 on_Rect = new Rect(switch_off_Bkg.getWidth() - slip_Btn.getWidth(), 0, switch_off_Bkg.getWidth(), slip_Btn.getHeight()); //左半边Rect，即滑动按钮在左半边时表示开关关闭 off_Rect = new Rect(0, 0, slip_Btn.getWidth(), slip_Btn.getHeight()); } protected void setSwitchState(boolean switchState) { isSwitchOn = switchState; } protected boolean getSwitchState() { return isSwitchOn; } protected void updateSwitchState(boolean switchState) { isSwitchOn = switchState; invalidate(); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); Matrix matrix = new Matrix(); Paint paint = new Paint(); //滑动按钮的左边坐标 float left_SlipBtn; //手指滑动到左半边的时候表示开关为关闭状态，滑动到右半边的时候表示开关为开启状态 if(currentX < (switch_on_Bkg.getWidth() / 2)) { canvas.drawBitmap(switch_off_Bkg, matrix, paint); } else { canvas.drawBitmap(switch_on_Bkg, matrix, paint); } //判断当前是否正在滑动 if(isSlipping) { if(currentX > switch_on_Bkg.getWidth()) { left_SlipBtn = switch_on_Bkg.getWidth() - slip_Btn.getWidth(); } else { left_SlipBtn = currentX - slip_Btn.getWidth() / 2; } } else { //根据当前的开关状态设置滑动按钮的位置 if(isSwitchOn) { left_SlipBtn = on_Rect.left; } else { left_SlipBtn = off_Rect.left; } } //对滑动按钮的位置进行异常判断 if(left_SlipBtn < 0) { left_SlipBtn = 0; } else if(left_SlipBtn > switch_on_Bkg.getWidth() - slip_Btn.getWidth()) { left_SlipBtn = switch_on_Bkg.getWidth() - slip_Btn.getWidth(); } canvas.drawBitmap(slip_Btn, left_SlipBtn, 0, paint); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub setMeasuredDimension(switch_on_Bkg.getWidth(), switch_on_Bkg.getHeight()); } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch(event.getAction()) { //滑动 case MotionEvent.ACTION_MOVE: currentX = event.getX(); break; //按下 case MotionEvent.ACTION_DOWN: if(event.getX() > switch_on_Bkg.getWidth() || event.getY() > switch_on_Bkg.getHeight()) { return false; } isSlipping = true; previousX = event.getX(); currentX = previousX; break; //松开 case MotionEvent.ACTION_UP: isSlipping = false; //松开前开关的状态 boolean previousSwitchState = isSwitchOn; if(event.getX() >= (switch_on_Bkg.getWidth() / 2)) { isSwitchOn = true; } else { isSwitchOn = false; } //如果设置了监听器，则调用此方法 if(isSwitchListenerOn && (previousSwitchState != isSwitchOn)) { onSwitchListener.onSwitched(isSwitchOn); } break; default: break; } //重新绘制控件 invalidate(); return true; } public void setOnSwitchListener(OnSwitchListener listener) { onSwitchListener = listener; isSwitchListenerOn = true; } public interface OnSwitchListener { abstract void onSwitched(boolean isSwitchOn); } }