功能：滑动、媳妇、设置初始位置、共享存储当前位置、设置滑动范围
import android.content.Context; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.widget.Button; /** * Created by wangliang on 0027/2016/9/27. */ public class MoveButton extends Button { private int screenWidth; private int screenHeight; private Integer defaultLeft; private Integer defaultTop; private Integer defaultRight; private Integer defaultBottom; public MoveButton(Context context) { super(context); DisplayMetrics dm=getResources().getDisplayMetrics(); screenWidth=dm.widthPixels; screenHeight=dm.heightPixels; } public MoveButton(Context context, AttributeSet attrs) { super(context, attrs); DisplayMetrics dm=getResources().getDisplayMetrics(); screenWidth=dm.widthPixels; screenHeight=dm.heightPixels; } public MoveButton(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); DisplayMetrics dm=getResources().getDisplayMetrics(); screenWidth=dm.widthPixels; screenHeight=dm.heightPixels; } public void setLocation(int l, int t, int r, int b){ this.defaultLeft = l; this.defaultTop = t; this.defaultRight = r; this.defaultBottom = b; } public void setScreenCcope(int screenWidth,int screenHeight){ this.screenWidth = screenWidth; this.screenHeight = screenHeight; } int lastX,lastY; int downX,downY; private boolean whetherScroll = false; @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: lastX=(int)event.getRawX();//获取触摸事件触摸位置的原始X坐标 lastY=(int)event.getRawY(); downX=(int)event.getRawX();//获取触摸事件触摸位置的原始X坐标 downY=(int)event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx=(int)event.getRawX()-lastX; int dy=(int)event.getRawY()-lastY; if(Math.abs(event.getRawX() - downX) < 10 && Math.abs(event.getRawY() - downY) < 10){ setEnabled(true); return super.onTouchEvent(event); } setEnabled(false); int l=getLeft()+dx; int b=getBottom()+dy; int r=getRight()+dx; int t=getTop()+dy; //下面判断移动是否超出屏幕 if(l<0){ l=0; r=l+getWidth(); } if(t<0){ t=0; b=t+getHeight(); } if(r>screenWidth){ r=screenWidth; l=r-getWidth(); } if(b > screenHeight){ b=screenHeight; t=b - getHeight(); } whetherFirstCreateView = false; layout(l, t, r, b); lastX=(int)event.getRawX(); lastY=(int)event.getRawY(); postInvalidate(); whetherScroll = true; break; case MotionEvent.ACTION_UP: if(Math.abs(event.getRawX() - downX) < 10 && Math.abs(event.getRawY() - downY) < 10){ setEnabled(true); return super.onTouchEvent(event); } dx=(int)event.getRawX()-lastX; dy=(int)event.getRawY()-lastY; l=getLeft()+dx; b=getBottom()+dy; r=getRight()+dx; t=getTop()+dy; if(l <= screenWidth - getWidth() - l) { layout(0, t, getWidth(), b); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_LEFT,0); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_RIGHT,getWidth()); }else { layout(screenWidth - getWidth(), t, screenWidth, b); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_LEFT,screenWidth - getWidth()); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_RIGHT,screenWidth); } setEnabled(true); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_TOP,t); SharedPrefUtils.putInt(AppCommon.MOVE_BUTTON_LOCATION_BOTTOM,b); whetherScroll = false; return true; } return super.onTouchEvent(event); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); } boolean whetherFirstCreateView = true; @Override public void layout(int l, int t, int r, int b) { if(whetherFirstCreateView && defaultLeft != null && defaultTop != null && defaultRight != null && defaultBottom != null){ super.layout(defaultLeft, defaultTop, defaultRight, defaultBottom); }else { if(whetherScroll && t != 0) {//只有在滑动的情况下才允许重新布局 super.layout(l, t, r, b); } } } }