package com.test.jiupin.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;
/**
 * Created by liaoyalong on 2016/12/8.
 */
public class AddImageGridView extends FrameLayout{
  private int width = 0;   //图片宽
  private int height = 0;    //图片高
  private int space = dp2px(10); //图片之间间隙
  private int childCount = 0;  //孩子数
  public AddImageGridView(Context context) {
    this(context,null);
  }
  public AddImageGridView(Context context, AttributeSet attrs) {
    this(context, attrs,0);
  }
  public AddImageGridView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }
  private void init() { //额没用上
  }
  public int getmSpace(){
    return space;
  }
  public int getmWidth() {
    return width;
  }
  public int getmHeight() { //这里我设置了宽高一样 ，所以也没用上
    return height;
  }
  public void addCammary(View view){ //添加相机 ，是第一个孩子
    addView(view,0);
  }
  public void addView(View view){   //添加子vie后控件会自动重新测量布局
    childCount = getChildCount();
    if(childCount == 5){         //最多能添加5张图片，既当添加到第五张图片的时候把相机删了
      removeViewAt(0);
      addView(view,4);
    } else{
      addView(view,childCount);
    }
  }
  @Override //最关键的了
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    childCount = getChildCount();
    int wdWidth = MeasureSpec.getSize(widthMeasureSpec);
    width = (wdWidth - 3 * space) / 4;           //屏幕分为三份间隙 和四份图片的宽度
    space += wdWidth % 4 / 3;               //重新计算间隙
    height = width;                    //高度和宽度一样
    int childWidthSPEC = MeasureSpec.makeMeasureSpec(width,MeasureSpec.EXACTLY);    //精确测量
    int childHeightSPEC = MeasureSpec.makeMeasureSpec(height,MeasureSpec.EXACTLY);
    for (int i = 0; i < childCount; i++) {
      View view = getChildAt(i);
      view.measure(childWidthSPEC,childHeightSPEC);
    }
    int wdHeight = height;
    if(childCount > 4){
      wdHeight += height + space;              //最多有五个既超过四个，高度变成两层
    }
    setMeasuredDimension(wdWidth,wdHeight);             
  }
  @Override
  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    for (int i = 0; i < childCount; i++) {     //上面我们自己测量好了，这里我们自己放控件的位置，不需要管原来left,top之类的值
      View view = getChildAt(i);
      left = 0;
      top = 0;
      if(i > 0){
        left = i * width + i * space;     //每个孩子对应的位置，自己画图分析
      }
      if(i == 4){ //第二层
        left = 0;
        top = height + space;
      }
      right = left + width;
      bottom = top + height;
      view.layout(left,top,right,bottom);
    }
  }
  public int dp2px(int dp){
    return (int) (getResources().getDisplayMetrics().density * dp +.5);
  }
}

package com.test.jiupin.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.View;
/**
 * Created by liaoyalong on 2016/12/12.
 */
public class moveView extends View{
  private Bitmap mBitmap; //按1秒钟图片的bitmap 既原显示的都是imageview 我把它们显示的bitmap 用iv.set(bitmap)
  private int left;    //相对屏幕的位置，画的时候要用
  private int top;    //同上理
  private int width;   //点击的图片的宽度
  private int height;   
  private int mStatusBarheight; //手机屏幕状态栏高度
  private int wdWidth;      //屏幕宽度
  private int wdHeight;     //屏幕高度
  private int orgTop;      //刚点击时 点击图片相对屏幕的高度
  public moveView(Context context,View v,MotionEvent event,boolean is4,int spac) {
    super(context);
    mBitmap = (Bitmap) v.getTag();    //从点击的图片那获取bitmap
    left = (int) (event.getRawX() - event.getX());   //相对屏幕像素 - 相对控件像素
    top = (int) (event.getRawY() - event.getY());
    orgTop = top;
    width = v.getWidth();
    height = v.getHeight();
    if (is4){                  //第二层
      orgTop = orgTop - height - spac;
    }
    mStatusBarheight = getStatusBarHeight();      //状态栏高度
    wdWidth = getResources().getDisplayMetrics().widthPixels;     //
    wdHeight = getResources().getDisplayMetrics().heightPixels;
  }
  @Override
  protected void onDraw(Canvas canvas) {
    canvas.save();
    canvas.translate(0,-mStatusBarheight);//移状态栏高度，这里不懂看我前面QQ移动小球的文章
    if(left < 0){
      left = 0;
    }else if(left + width > wdWidth){        //不能移出屏幕
      left = wdWidth - width;
    }
    if (top < mStatusBarheight){
      top = mStatusBarheight;
    }else if(top + height > wdHeight){
      top = wdHeight - height;
    }
    canvas.drawBitmap(mBitmap,null,new Rect(left,top,left+width,top+height),null);
    canvas.restore();
  }
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()){
      case MotionEvent.ACTION_DOWN:
        break;
      case MotionEvent.ACTION_MOVE:
        left = (int) (event.getRawX()-width/2); //手指点的为中心点
        top = (int) (event.getRawY()-height/2);
        if (mOnDragListener != null){       //回调方法，返回中心点与其它图片进行比较
          mOnDragListener.onMove((int)event.getRawX(),(int)event.getRawY() +mStatusBarheight - orgTop - height/2);
        }
        postInvalidate();
        break;
      case MotionEvent.ACTION_UP:
        if (mOnDragListener != null){  //手抬起时触发消失回调
          mOnDragListener.onDisappear();
        }
        break;
    }
    return true;
  }
  public int getStatusBarHeight() {//获取状态栏高度
    int result = 0;
    int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
      result = getResources().getDimensionPixelSize(resourceId);
    }
    return result;
  }
  public interface OnDragListener{
    void onDisappear();
    void onMove(int centerX,int centerY);
  }
  private OnDragListener mOnDragListener;
  public void setOnDragListener(OnDragListener listener){
    mOnDragListener = listener;
  }
}

/**
   * 该不该交换图片
   *
   * @param wx  移动传回来的中心点
   * @param wy
   * @param x   与之相比较的点
   * @param y
   * @param range 比较范围
   * @return
   */
  private boolean shouldReplace(int wx, int wy, int x, int y, int range) {
    boolean flag = false;
    if (wx > x - range && wx < x + range && wy > y - range && wy < y + range) {
      flag = true;
    }
    return flag;
  }

private void initMoveListener() {
    for (int i = 0; i < mViews.size(); i++) {  //mViews存的那些评论图片
      final int finalI = i;
      mViews.get(i).setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(final View v, final MotionEvent event) {
          if (MotionEvent.ACTION_DOWN == event.getAction()) {
            downTime = System.currentTimeMillis();       //按下时的时间
            v.getParent().requestDisallowInterceptTouchEvent(true); //请求父控件不要拦截触摸事件
          } else {
            spacTime = System.currentTimeMillis() - downTime;     //按了多久
          }
//          Log.e("test",spacTime+"");
          if (!first && spacTime > 1000) { //按了一秒才让移动  
            curentSpace = finalI;   //当前按得位置
            first = true;
            v.setVisibility(View.INVISIBLE);  //把按得图片隐藏
            if (mViews.size() < 5) {     //创建移动图片
              if (finalI != 3) {
                mMoveView = new moveView(MainActivity.this, v, event, false, 0);
              } else {
                mMoveView = new moveView(MainActivity.this, v, event, true, mAddImageGridView
                    .getmSpace());
              }
            } else {
              if (finalI != 4) {
                mMoveView = new moveView(MainActivity.this, v, event, false, 0);
              } else {
                mMoveView = new moveView(MainActivity.this, v, event, true, mAddImageGridView
                    .getmSpace());
              }
            }
            mWindowManager.addView(mMoveView, mParams);//添加移动图片,注意mParams.format = PixelFormat.TRANSLUCENT;
            fisselect = (Bitmap) v.getTag(); //刚开始按选择的图片，用于放手时显示，
            mMoveView.setOnDragListener(new moveView.OnDragListener() {//moveView的滑动监听
              @Override
              public void onDisappear() {     //手抬起时
                if (mMoveView != null && mWindowManager != null) {
                  mWindowManager.removeView(mMoveView); //移除
                  v.setOnTouchListener(new View.OnTouchListener() { //消失的时候覆盖触摸事件，不然第二次就不需要按一秒了
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                      return false;
                    }
                  });
                  mMoveView = null;
                }
//                    Log.e("test","curentSpace:"+curentSpace);
                ImageView iv = (ImageView) mViews.get(curentSpace);
                iv.setImageBitmap(fisselect);     //第一次按时选择的图片
                iv.setVisibility(View.VISIBLE);
                iv.setTag(fisselect);        
                first = false;
                spacTime = 0L;
                initMoveListener();
              }
              int width = mAddImageGridView.getmWidth(); //图片宽度
              int spc = mAddImageGridView.getmSpace();  //图片之间间隙
              @Override
              public void onMove(int centerX, int centerY) { //返回中心点的回调
                for (int j = 0; j < mViews.size(); j++) { //算各个图片的中心点，依次进行比较
                  if (j != curentSpace) {
                    int x = 0;
                    int y = 0;
                    if (mViews.size() < 5) {
                      if (j < 3) { //第一排的中心点
                        x = (j + 2) * width + (j + 1) * spc - width / 2;
                        y = width / 2;
                      } else if (j != curentSpace && j >= 3) { //第二排的中心点。图片宽高相等
                        x = (j - 3) * (width + spc) + width / 2;
                        y = width + spc + width / 2;
                      }
                    } else {
                      if (j < 4) { //第一排的中心点
                        x = (j + 1) * width + j * spc - width / 2;
                        y = width / 2;
                      } else if (j != curentSpace && j >= 4) { //第二排的中心点。图片宽高相等
                        x = (j - 4) * (width + spc) + width / 2;
                        y = width + spc + width / 2;
                      }
                    }
                    if (shouldReplace(centerX, centerY, x, y, 70)) {  //如果要与J位置的view进行交换
//                          Log.e("test","currenspac:"+curentSpace + "  j:"+j);
                      Bitmap bitmap = (Bitmap) mViews.get(j).getTag();   //获得j位置的bitmap
                      mViews.get(j).setVisibility(View.INVISIBLE);     //把j位置对应的view隐藏
                      ImageView iv = (ImageView) mViews.get(curentSpace);  //原来隐藏的bitmap
                      iv.setImageBitmap(bitmap);              //原来隐藏的view换成j的bitmap 
                      iv.setVisibility(View.VISIBLE);           //把原来隐藏的view显示
                      iv.setTag(bitmap);     //如果交换，把交换的那个隐藏，原来隐藏的显示，并把图片设置为交换的、还要保持tag
                      curentSpace = j;      //当前空位换为交换既隐藏的那个位置，当松手时要显示，最原始的的bitmap前面已经保存
//                          Log.e("test","currenspac:"+curentSpace + "  j:"+j);
                      break; //交换停止本次循环
                    }
                  }
                }
              }
            });
          }
          if (mMoveView != null) {
            mMoveView.onTouchEvent(event); //把触摸事件传递给move控件
          }
          return false; //还要处理点击事件
        }
      });
    }
  }