package com.hupu.games.view.dragGridView;
import java.util.LinkedList;
import java.util.List;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.os.Build;
import android.os.Handler;
import android.os.Vibrator;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.view.WindowManager;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ListAdapter;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorListenerAdapter;
import com.nineoldandroids.animation.AnimatorSet;
import com.nineoldandroids.animation.ObjectAnimator;
/**
* 可拖拽的GridView, 添加Item的交换效果
*
* @blog http://blog.csdn.net/xiaanming
*
* @author xiaanming
*
*/
@TargetApi(Build.VERSION_CODES.FROYO)
public class DragGridView extends GridView{
/**
* DragGridView的item长按响应的时间， 默认是1000毫秒，也可以自行设置
*/
private long dragResponseMS = 100;
/**
* 是否可以拖拽，默认不可以
*/
private boolean isDrag = false;
private int mDownX;
private int mDownY;
private int moveX;
private int moveY;
/**
* 正在拖拽的position
*/
private int mDragPosition;
/**
* 刚开始拖拽的item对应的View
*/
private View mStartDragItemView = null;
/**
* 用于拖拽的镜像，这里直接用一个ImageView
*/
private ImageView mDragImageView;
/**
* 震动器
*/
private Vibrator mVibrator;
private WindowManager mWindowManager;
/**
* item镜像的布局参数
*/
private WindowManager.LayoutParams mWindowLayoutParams;
/**
* 我们拖拽的item对应的Bitmap
*/
private Bitmap mDragBitmap;
/**
* 按下的点到所在item的上边缘的距离
*/
private int mPoint2ItemTop ;
/**
* 按下的点到所在item的左边缘的距离
*/
private int mPoint2ItemLeft;
/**
* DragGridView距离屏幕顶部的偏移量
*/
private int mOffset2Top;
/**
* DragGridView距离屏幕左边的偏移量
*/
private int mOffset2Left;
/**
* 状态栏的高度
*/
private int mStatusHeight;
/**
* DragGridView自动向下滚动的边界值
*/
private int mDownScrollBorder;
/**
* DragGridView自动向上滚动的边界值
*/
private int mUpScrollBorder;
/**
* DragGridView自动滚动的速度
*/
private static final int speed = 20;
/**
* item的移动动画是否结束
*/
private boolean mAnimationEnd = true;
private DragGridBaseAdapter mDragAdapter;
/**
* GridView的列数
*/
private int mNumColumns;
/**
* 当GridView的numColumns设置为AUTO_FIT，我们需要计算GirdView具体的列数
*/
private int mColumnWidth;
/**
* GridView是否设置了numColumns为具体的数字
*/
private boolean mNumColumnsSet;
private int mHorizontalSpacing;
private int mVerticalSpacing;
private boolean isDraging = false;
public DragGridView(Context context) {
this(context, null);
}
public DragGridView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DragGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mStatusHeight = getStatusHeight(context); //获取状态栏的高度
if(!mNumColumnsSet){
mNumColumns = AUTO_FIT;
}
}
/**
* 删除item的动画效果
* @param position
*/
public void removeItemAnimation(final int position){
mDragAdapter.removeItem(position);
final ViewTreeObserver observer = getViewTreeObserver();
observer.addOnPreDrawListener(new OnPreDrawListener() {
@Override
public boolean onPreDraw() {
observer.removeOnPreDrawListener(this);
animateReorder(position, getLastVisiblePosition() + 1 );
return true;
}
} );
}
private Handler mHandler = new Handler();
//用来处理是否为长按的Runnable
private Runnable mLongClickRunnable = new Runnable() {
@Override
public void run() {
isDrag = true; //设置可以拖拽
mVibrator.vibrate(50); //震动一下
mStartDragItemView.setVisibility(View.INVISIBLE);//隐藏该item
//根据我们按下的点显示item镜像
createDragImage(mDragBitmap, mDownX, mDownY);
}
};
@Override
public void setAdapter(ListAdapter adapter) {
super.setAdapter(adapter);
if(adapter instanceof DragGridBaseAdapter){
mDragAdapter = (DragGridBaseAdapter) adapter;
}else{
throw new IllegalStateException("the adapter must be implements DragGridAdapter");
}
}
/**
* 获取列数
*/
@Override
public void setNumColumns(int numColumns) {
super.setNumColumns(numColumns);
mNumColumnsSet = true;
this.mNumColumns = numColumns;
}
/**
* 获取设置的列宽
*/
@Override
public void setColumnWidth(int columnWidth) {
super.setColumnWidth(columnWidth);
mColumnWidth = columnWidth;
}
/**
* 获取水平方向的间隙
*/
@Override
public void setHorizontalSpacing(int horizontalSpacing) {
super.setHorizontalSpacing(horizontalSpacing);
this.mHorizontalSpacing = horizontalSpacing;
}
/**
* 获取竖直方向的间隙
*/
@Override
public void setVerticalSpacing(int verticalSpacing) {
super.setVerticalSpacing(verticalSpacing);
this.mVerticalSpacing = verticalSpacing;
}
/**
* 若列数设置为AUTO_FIT，我们在这里面计算具体的列数
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mNumColumns == AUTO_FIT) {
int numFittedColumns;
if (mColumnWidth > 0) {
int gridWidth = Math.max(MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft()
- getPaddingRight(), 0);
numFittedColumns = gridWidth / mColumnWidth;
if (numFittedColumns > 0) {
while (numFittedColumns != 1) {
if (numFittedColumns * mColumnWidth + (numFittedColumns - 1)
* mHorizontalSpacing > gridWidth) {
numFittedColumns--;
} else {
break;
}
}
} else {
numFittedColumns = 1;
}
} else {
numFittedColumns = 2;
}
mNumColumns = numFittedColumns;
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
/**
* 设置响应拖拽的毫秒数，默认是1000毫秒
* @param dragResponseMS
*/
public void setDragResponseMS(long dragResponseMS) {
this.dragResponseMS = dragResponseMS;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch(ev.getAction()){
case MotionEvent.ACTION_DOWN:
mDownX = (int) ev.getX();
mDownY = (int) ev.getY();
//根据按下的X,Y坐标获取所点击item的position
mDragPosition = pointToPosition(mDownX, mDownY);
if(mDragPosition == AdapterView.INVALID_POSITION){
return super.dispatchTouchEvent(ev);
}
//使用Handler延迟dragResponseMS执行mLongClickRunnable
mHandler.postDelayed(mLongClickRunnable, dragResponseMS);
//根据position获取该item所对应的View
mStartDragItemView = getChildAt(mDragPosition - getFirstVisiblePosition());
//下面这几个距离大家可以参考我的博客上面的图来理解下
mPoint2ItemTop = mDownY - mStartDragItemView.getTop();
mPoint2ItemLeft = mDownX - mStartDragItemView.getLeft();
mOffset2Top = (int) (ev.getRawY() - mDownY);
mOffset2Left = (int) (ev.getRawX() - mDownX);
//获取DragGridView自动向上滚动的偏移量，小于这个值，DragGridView向下滚动
mDownScrollBorder = getHeight() / 5;
//获取DragGridView自动向下滚动的偏移量，大于这个值，DragGridView向上滚动
mUpScrollBorder = getHeight() * 4/5;
//开启mDragItemView绘图缓存
mStartDragItemView.setDrawingCacheEnabled(true);
//获取mDragItemView在缓存中的Bitmap对象
mDragBitmap = Bitmap.createBitmap(mStartDragItemView.getDrawingCache());
//这一步很关键，释放绘图缓存，避免出现重复的镜像
mStartDragItemView.destroyDrawingCache();
break;
case MotionEvent.ACTION_MOVE:
int moveX = (int)ev.getX();
int moveY = (int) ev.getY();
//如果我们在按下的item上面移动，只要不超过item的边界我们就不移除mRunnable
if(!isTouchInItem(mStartDragItemView, moveX, moveY)){
mHandler.removeCallbacks(mLongClickRunnable);
if(!isDraging)
{
mStartDragItemView = null;
}
onTouchEvent(ev);
return false;
}
break;
case MotionEvent.ACTION_UP:
onStopDrag();
isDrag = false;
mHandler.removeCallbacks(mLongClickRunnable);
mHandler.removeCallbacks(mScrollRunnable);
break;
}
return super.dispatchTouchEvent(ev);
}
/**
* 是否点击在GridView的item上面
* @param itemView
* @param x
* @param y
* @return
*/
private boolean isTouchInItem(View dragView, int x, int y){
if(dragView == null){
return false;
}
int leftOffset = dragView.getLeft();
int topOffset = dragView.getTop();
if(x < leftOffset || x > leftOffset + dragView.getWidth()){
return false;
}
if(y < topOffset || y > topOffset + dragView.getHeight()){
return false;
}
return true;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if(isDrag && mDragImageView != null){
isDraging = true;
switch(ev.getAction()){
case MotionEvent.ACTION_MOVE:
moveX = (int) ev.getX();
moveY = (int) ev.getY();
//拖动item
onDragItem(moveX, moveY);
break;
case MotionEvent.ACTION_UP:
onStopDrag();
isDrag = false;
break;
}
return true;
}
return super.onTouchEvent(ev);
}
/**
* 创建拖动的镜像
* @param bitmap
* @param downX
* 按下的点相对父控件的X坐标
* @param downY
* 按下的点相对父控件的X坐标
*/
private void createDragImage(Bitmap bitmap, int downX , int downY){
mWindowLayoutParams = new WindowManager.LayoutParams();
mWindowLayoutParams.format = PixelFormat.TRANSLUCENT; //图片之外的其他地方透明
mWindowLayoutParams.gravity = Gravity.TOP | Gravity.LEFT;
mWindowLayoutParams.x = downX - mPoint2ItemLeft + mOffset2Left;
mWindowLayoutParams.y = downY - mPoint2ItemTop + mOffset2Top - mStatusHeight;
mWindowLayoutParams.alpha = 0.55f; //透明度
mWindowLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mWindowLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE ;
mDragImageView = new ImageView(getContext());
mDragImageView.setImageBitmap(bitmap);
mWindowManager.addView(mDragImageView, mWindowLayoutParams);
}
/**
* 从界面上面移动拖动镜像
*/
private void removeDragImage(){
if(mDragImageView != null){
mWindowManager.removeView(mDragImageView);
mDragImageView = null;
}
}
/**
* 拖动item，在里面实现了item镜像的位置更新，item的相互交换以及GridView的自行滚动
* @param x
* @param y
*/
private void onDragItem(int moveX, int moveY){
mWindowLayoutParams.x = moveX - mPoint2ItemLeft + mOffset2Left;
mWindowLayoutParams.y = moveY - mPoint2ItemTop + mOffset2Top - mStatusHeight;
mWindowManager.updateViewLayout(mDragImageView, mWindowLayoutParams); //更新镜像的位置
onSwapItem(moveX, moveY);
//GridView自动滚动
mHandler.post(mScrollRunnable);
}
/**
* 当moveY的值大于向上滚动的边界值，触发GridView自动向上滚动
* 当moveY的值小于向下滚动的边界值，触发GridView自动向下滚动
* 否则不进行滚动
*/
private Runnable mScrollRunnable = new Runnable() {
@Override
public void run() {
int scrollY;
if(getFirstVisiblePosition() == 0 || getLastVisiblePosition() == getCount() - 1){
mHandler.removeCallbacks(mScrollRunnable);
}
if(moveY > mUpScrollBorder){
scrollY = speed;
mHandler.postDelayed(mScrollRunnable, 25);
}else if(moveY < mDownScrollBorder){
scrollY = -speed;
mHandler.postDelayed(mScrollRunnable, 25);
}else{
scrollY = 0;
mHandler.removeCallbacks(mScrollRunnable);
}
smoothScrollBy(scrollY, 10);
}
};
/**
* 交换item,并且控制item之间的显示与隐藏效果
* @param moveX
* @param moveY
*/
@SuppressLint("NewApi")
private void onSwapItem(int moveX, int moveY){
//获取我们手指移动到的那个item的position
final int tempPosition = pointToPosition(moveX, moveY);
//假如tempPosition 改变了并且tempPosition不等于-1,则进行交换
if(tempPosition != mDragPosition && tempPosition != AdapterView.INVALID_POSITION && mAnimationEnd){
/**
* 交换item
*/
mDragAdapter.reorderItems(mDragPosition, tempPosition);
/**
* 设置新到的位置隐藏
*/
mDragAdapter.setHideItem(tempPosition);
final ViewTreeObserver observer = getViewTreeObserver();
observer.addOnPreDrawListener(new OnPreDrawListener() {
@Override
public boolean onPreDraw() {
observer.removeOnPreDrawListener(this);
animateReorder(mDragPosition, tempPosition);
mDragPosition = tempPosition;
return true;
}
} );
}
}
/**
* 创建移动动画
* @param view
* @param startX
* @param endX
* @param startY
* @param endY
* @return
*/
private AnimatorSet createTranslationAnimations(View view, float startX,
float endX, float startY, float endY) {
ObjectAnimator animX = ObjectAnimator.ofFloat(view, "translationX",
startX, endX);
ObjectAnimator animY = ObjectAnimator.ofFloat(view, "translationY",
startY, endY);
AnimatorSet animSetXY = new AnimatorSet();
animSetXY.playTogether(animX, animY);
return animSetXY;
}
/**
* item的交换动画效果
* @param oldPosition
* @param newPosition
*/
private void animateReorder(final int oldPosition, final int newPosition) {
boolean isForward = newPosition > oldPosition;
List<Animator> resultList = new LinkedList<Animator>();
if (isForward) {
for (int pos = oldPosition; pos < newPosition; pos++) {
View view = getChildAt(pos - getFirstVisiblePosition());
if ((pos + 1) % mNumColumns == 0) {
resultList.add(createTranslationAnimations(view,
- (view.getWidth() + mHorizontalSpacing) * (mNumColumns - 1), 0,
view.getHeight() + mVerticalSpacing, 0));
} else {
resultList.add(createTranslationAnimations(view,
view.getWidth() + mHorizontalSpacing, 0, 0, 0));
}
}
} else {
for (int pos = oldPosition; pos > newPosition; pos--) {
View view = getChildAt(pos - getFirstVisiblePosition());
if ((pos) % mNumColumns == 0) {
resultList.add(createTranslationAnimations(view,
(view.getWidth() + mHorizontalSpacing) * (mNumColumns - 1), 0,
-view.getHeight() - mVerticalSpacing, 0));
} else {
resultList.add(createTranslationAnimations(view,
-view.getWidth() - mHorizontalSpacing, 0, 0, 0));
}
}
}
AnimatorSet resultSet = new AnimatorSet();
resultSet.playTogether(resultList);
resultSet.setDuration(300);
resultSet.setInterpolator(new AccelerateDecelerateInterpolator());
resultSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
mAnimationEnd = false;
}
@Override
public void onAnimationEnd(Animator animation) {
mAnimationEnd = true;
}
});
resultSet.start();
}
/**
* 停止拖拽我们将之前隐藏的item显示出来，并将镜像移除
*/
private void onStopDrag(){
View view = getChildAt(mDragPosition - getFirstVisiblePosition());
if(view != null){
view.setVisibility(View.VISIBLE);
}
mDragAdapter.setHideItem(-1);
isDraging = false;
removeDragImage();
}
/**
* 获取状态栏的高度
* @param context
* @return
*/
private static int getStatusHeight(Context context){
int statusHeight = 0;
Rect localRect = new Rect();
((Activity) context).getWindow().getDecorView().getWindowVisibleDisplayFrame(localRect);
statusHeight = localRect.top;
if (0 == statusHeight){
Class<?> localClass;
try {
localClass = Class.forName("com.android.internal.R$dimen");
Object localObject = localClass.newInstance();
int i5 = Integer.parseInt(localClass.getField("status_bar_height").get(localObject).toString());
statusHeight = context.getResources().getDimensionPixelSize(i5);
} catch (Exception e) {
e.printStackTrace();
}
}
return statusHeight;
}
}