Android自定义ListView实现仿QQ可拖拽列表功能

<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><ImageViewandroid:id="@+id/iv_logo"android:layout_width="50dp"android:layout_height="50dp"android:layout_alignParentLeft="true"android:layout_centerInParent="true"android:layout_marginLeft="10dp"/><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:layout_marginLeft="10dp"android:layout_toRightOf="@id/iv_logo"/></RelativeLayout>

package com.liuguilin.draglistviewsample.entity;/** 项目名： DragListViewSample * 包名： com.liuguilin.draglistviewsample.entity* 文件名: DragBean* 创建者: LGL* 创建时间: 2016/8/29 22:49* 描述： 实体类*/public class DragBean {private int ivId;private String text;public DragBean() {}public DragBean(int ivId, String text) {this.ivId = ivId;this.text = text;}public int getIvId() {return ivId;}public String getText() {return text;}}

package com.liuguilin.draglistviewsample.adapter;/** 项目名： DragListViewSample * 包名： com.liuguilin.draglistviewsample.adapter* 文件名: DragAdapter* 创建者: LGL* 创建时间: 2016/8/29 22:41* 描述： 拖拽列表的数据源*/import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import com.liuguilin.draglistviewsample.R;import com.liuguilin.draglistviewsample.entity.DragBean;import java.util.List;public class DragAdapter extends ArrayAdapter<DragBean> {/*** 构造方法** @param context* @param mList*/public DragAdapter(Context context, List<DragBean> mList) {super(context, 0, mList);}/*** 实现View** @param position* @param convertView* @param parent* @return*/@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view;ViewHolder viewHolder;if (convertView == null) {view = View.inflate(getContext(), R.layout.list_item, null);viewHolder = new ViewHolder();viewHolder.imageView = (ImageView) view.findViewById(R.id.iv_logo);viewHolder.textView = (TextView) view.findViewById(R.id.textView);view.setTag(viewHolder);} else {view = convertView;viewHolder = (ViewHolder) view.getTag();}viewHolder.imageView.setImageResource(getItem(position).getIvId());viewHolder.textView.setText(getItem(position).getText());return view;}/*** 缓存*/static class ViewHolder {ImageView imageView;TextView textView;}}

package com.liuguilin.draglistviewsample;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import com.liuguilin.draglistviewsample.adapter.DragAdapter;import com.liuguilin.draglistviewsample.entity.DragBean;import com.liuguilin.draglistviewsample.view.DragListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {//列表private DragListView mListView;//数据private List<DragBean> mList = new ArrayList<>();//数据源private DragAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}/*** 初始化View*/private void initView() {mListView = (DragListView) findViewById(R.id.mListView);//新增for (int i = 0; i < 30; i++) {DragBean bean = new DragBean(R.mipmap.ic_launcher, "刘某人程序员" + i);mList.add(bean);}//初始化数据源adapter = new DragAdapter(this,mList);mListView.setAdapter(adapter);}}

/*** 获取触点所在条目的位置* 获取选中条目的图片* 事件的拦截机制** @param ev* @return*/@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {//识别动作switch (ev.getAction()) {case MotionEvent.ACTION_DOWN://获取触点的坐标int x = (int) ev.getX();int y = (int) ev.getY();//这样就可以计算我按到哪个条目上了mStartPosition = mEndPosition = pointToPosition(x, y);//判断触点是否在logo的区域ViewGroup itemView = (ViewGroup) getChildAt(mStartPosition - getFirstVisiblePosition());//记录手指在条目中的相对Y坐标dragPoint = y - itemView.getTop();//ListView在屏幕中的Y坐标dragOffset = (int) (ev.getRawY() - y);//拖动的图标View dragger = itemView.findViewById(R.id.iv_logo);//判断触点是否在logo区域if (dragger != null && x < dragger.getRight() + 10) {//定义ListView的滚动条目//上upScroll = getHeight() / 3;//下downScroll = getHeight() * 2 / 3;//获取选中的图片/截图itemView.setDrawingCacheEnabled(true);//获取截图Bitmap bitMap = itemView.getDrawingCache();//图片滚动startDrag(bitMap, y);}break;}//还会传递事件到子Viewreturn false;}

/*** 图片在Y轴，也就是上下可滚动** @param bitMap* @param y*/private void startDrag(Bitmap bitMap, int y) {//窗体仿照wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);//设置窗体参数lParams = new WindowManager.LayoutParams();//设置宽高lParams.width = WindowManager.LayoutParams.WRAP_CONTENT;lParams.height = WindowManager.LayoutParams.WRAP_CONTENT;//属性lParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;//设置半透明lParams.alpha = 0.8f;//设置居中lParams.gravity = Gravity.TOP;//设置xylParams.x = 0;lParams.y = y-dragPoint + dragOffset;//属性lParams.format = PixelFormat.TRANSLUCENT;//设置动画lParams.windowAnimations = 0;//图片dragImageView = new ImageView(getContext());//设置截图dragImageView.setImageBitmap(bitMap);//添加显示窗体wm.addView(dragImageView, lParams);}

/*** 触摸事件** @param ev* @return*/@Overridepublic boolean onTouchEvent(MotionEvent ev) {//错误的位置if (dragImageView != null && mEndPosition != INVALID_POSITION) {//在滑动事件中控制上下滑动switch (ev.getAction()) {case MotionEvent.ACTION_MOVE://直接获取到Y坐标进行移动int moveY = (int) ev.getY();doDrag(moveY);break;//停止拖动成像case MotionEvent.ACTION_UP:int upY = (int) ev.getY();stopDrag();onDrag(upY);break;}}//拦截到事件return true;}

/*** 控制窗体移动** @param moveY*/private void doDrag(int moveY) {if (dragImageView != null) {lParams.y = moveY - dragPoint + dragOffset;wm.updateViewLayout(dragImageView, lParams);}//判断移动到分割线 返回-1int tempLine = pointToPosition(0, moveY);//我们处理他if (tempLine != INVALID_POSITION) {//只要你不移动到分割线 我才处理mEndPosition = tempLine;}//拖拽时滚动、滚动速度int scrollSpeed = 0;//上滚if (moveY < upScroll) {scrollSpeed = 10;//下滚} else if (moveY > downScroll) {scrollSpeed = -10;}//开始滚动if (scrollSpeed != 0) {//计算条目的Y坐标int dragItemY = getChildAt(mEndPosition - getFirstVisiblePosition()).getTop();//当前速度int dy = dragItemY + scrollSpeed;//设置setSelectionFromTop(mEndPosition, dy);}}

/*** 停止的位置*/private void stopDrag() {//直接移除窗体if (dragImageView != null) {wm.removeView(dragImageView);dragImageView = null;}}

/*** 最终开始成像** @param upY*/private void onDrag(int upY) {//分割线的处理//判断移动到分割线 返回-1int tempLine = pointToPosition(0, upY);//我们处理他if (tempLine != INVALID_POSITION) {//只要你不移动到分割线 我才处理mEndPosition = tempLine;}/*** 你在最上方就直接落在第一个最下方就直接最下面一个*///上边界处理if (upY < getChildAt(1).getTop()) {mEndPosition = 1;//下边界处理} else if (upY > getChildAt(getChildCount() - 1).getTop()) {mEndPosition = getAdapter().getCount() - 1;}//开始更新item顺序if (mEndPosition > 0 && mEndPosition < getAdapter().getCount()) {DragAdapter adapter = (DragAdapter) getAdapter();//删除原来的条目adapter.remove(adapter.getItem(mStartPosition));//更新adapter.insert(adapter.getItem(mStartPosition), mEndPosition);}}

package com.liuguilin.draglistviewsample.view;/** 项目名： DragListViewSample * 包名： com.liuguilin.draglistviewsample.view* 文件名: DragListView* 创建者: LGL* 创建时间: 2016/8/29 20:50* 描述： 自定义高仿QQ列表可拖拽的ListView*/import android.content.Context;import android.graphics.Bitmap;import android.graphics.PixelFormat;import android.util.AttributeSet;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.ImageView;import android.widget.ListView;import com.liuguilin.draglistviewsample.R;import com.liuguilin.draglistviewsample.adapter.DragAdapter;public class DragListView extends ListView {//按下选中的positionprivate int mStartPosition;//需要达到的positionprivate int mEndPosition;//手指在条目中的相对Y坐标private int dragPoint;//ListView在屏幕中的Y坐标private int dragOffset;//上private int upScroll;//下private int downScroll;//窗体private WindowManager wm;//显示的截图private ImageView dragImageView;//窗体参数private WindowManager.LayoutParams lParams;//构造方法public DragListView(Context context, AttributeSet attrs) {super(context, attrs);}/*** 获取触点所在条目的位置* 获取选中条目的图片* 事件的拦截机制** @param ev* @return*/@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {//识别动作switch (ev.getAction()) {case MotionEvent.ACTION_DOWN://获取触点的坐标int x = (int) ev.getX();int y = (int) ev.getY();//这样就可以计算我按到哪个条目上了mStartPosition = mEndPosition = pointToPosition(x, y);//判断触点是否在logo的区域ViewGroup itemView = (ViewGroup) getChildAt(mStartPosition - getFirstVisiblePosition());//记录手指在条目中的相对Y坐标dragPoint = y - itemView.getTop();//ListView在屏幕中的Y坐标dragOffset = (int) (ev.getRawY() - y);//拖动的图标View dragger = itemView.findViewById(R.id.iv_logo);//判断触点是否在logo区域if (dragger != null && x < dragger.getRight() + 10) {//定义ListView的滚动条目//上upScroll = getHeight() / 3;//下downScroll = getHeight() * 2 / 3;//获取选中的图片/截图itemView.setDrawingCacheEnabled(true);//获取截图Bitmap bitMap = itemView.getDrawingCache();//图片滚动startDrag(bitMap, y);}break;}//还会传递事件到子Viewreturn false;}/*** 图片在Y轴，也就是上下可滚动** @param bitMap* @param y*/private void startDrag(Bitmap bitMap, int y) {//窗体仿照wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);//设置窗体参数lParams = new WindowManager.LayoutParams();//设置宽高lParams.width = WindowManager.LayoutParams.WRAP_CONTENT;lParams.height = WindowManager.LayoutParams.WRAP_CONTENT;//属性lParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;//设置半透明lParams.alpha = 0.8f;//设置居中lParams.gravity = Gravity.TOP;//设置xylParams.x = 0;lParams.y = y-dragPoint + dragOffset;//属性lParams.format = PixelFormat.TRANSLUCENT;//设置动画lParams.windowAnimations = 0;//图片dragImageView = new ImageView(getContext());//设置截图dragImageView.setImageBitmap(bitMap);//添加显示窗体wm.addView(dragImageView, lParams);}/*** 触摸事件** @param ev* @return*/@Overridepublic boolean onTouchEvent(MotionEvent ev) {//错误的位置if (dragImageView != null && mEndPosition != INVALID_POSITION) {//在滑动事件中控制上下滑动switch (ev.getAction()) {case MotionEvent.ACTION_MOVE://直接获取到Y坐标进行移动int moveY = (int) ev.getY();doDrag(moveY);break;//停止拖动成像case MotionEvent.ACTION_UP:int upY = (int) ev.getY();stopDrag();onDrag(upY);break;}}//拦截到事件return true;}/*** 最终开始成像** @param upY*/private void onDrag(int upY) {//分割线的处理//判断移动到分割线 返回-1int tempLine = pointToPosition(0, upY);//我们处理他if (tempLine != INVALID_POSITION) {//只要你不移动到分割线 我才处理mEndPosition = tempLine;}/*** 你在最上方就直接落在第一个最下方就直接最下面一个*///上边界处理if (upY < getChildAt(1).getTop()) {mEndPosition = 1;//下边界处理} else if (upY > getChildAt(getChildCount() - 1).getTop()) {mEndPosition = getAdapter().getCount() - 1;}//开始更新item顺序if (mEndPosition > 0 && mEndPosition < getAdapter().getCount()) {DragAdapter adapter = (DragAdapter) getAdapter();//删除原来的条目adapter.remove(adapter.getItem(mStartPosition));//更新adapter.insert(adapter.getItem(mStartPosition), mEndPosition);}}/*** 停止的位置*/private void stopDrag() {//直接移除窗体if (dragImageView != null) {wm.removeView(dragImageView);dragImageView = null;}}/*** 控制窗体移动** @param moveY*/private void doDrag(int moveY) {if (dragImageView != null) {lParams.y = moveY - dragPoint + dragOffset;wm.updateViewLayout(dragImageView, lParams);}//判断移动到分割线 返回-1int tempLine = pointToPosition(0, moveY);//我们处理他if (tempLine != INVALID_POSITION) {//只要你不移动到分割线 我才处理mEndPosition = tempLine;}//拖拽时滚动、滚动速度int scrollSpeed = 0;//上滚if (moveY < upScroll) {scrollSpeed = 10;//下滚} else if (moveY > downScroll) {scrollSpeed = -10;}//开始滚动if (scrollSpeed != 0) {//计算条目的Y坐标int dragItemY = getChildAt(mEndPosition - getFirstVisiblePosition()).getTop();//当前速度int dy = dragItemY + scrollSpeed;//设置setSelectionFromTop(mEndPosition, dy);}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"><com.liuguilin.draglistviewsample.view.DragListViewandroid:id="@+id/mListView"android:layout_width="match_parent"android:layout_height="match_parent"/></LinearLayout>

<!--窗口权限--><uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>