Android开发中滑动分页功能实例详解

package cn.anycall.ju;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.ActivityNotFoundException;import android.content.Context;import android.content.Intent;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.view.KeyEvent;import android.view.View;import android.view.Window;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.Toast;import cn.anycall.ju.ScrollLayout.OnScreenChangeListenerDataLoad;/** * GridView分页显示安装的应用程序 */public class AllAppList extends Activity {  private ScrollLayout mScrollLayout;  private static final float APP_PAGE_SIZE = 4.0f;  private Context mContext;  private PageControlView pageControl;  public MyHandler myHandler;  public int n=0;  private DataLoading dataLoad;  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    this.requestWindowFeature(Window.FEATURE_NO_TITLE);    mContext = this;    setContentView(R.layout.main);    dataLoad = new DataLoading();    mScrollLayout = (ScrollLayout)findViewById(R.id.ScrollLayoutTest);    myHandler = new MyHandler(this,1);    //起一个线程更新数据    MyThread m = new MyThread();    new Thread(m).start();  }  /**   * gridView 的onItemLick响应事件   */  public OnItemClickListener listener = new OnItemClickListener() {    public void onItemClick(AdapterView<?> parent, View view, int position,        long id) {      // TODO Auto-generated method stub      System.out.println("position="+position);    }  };  @Override  protected void onDestroy() {    // TODO Auto-generated method stub    android.os.Process.killProcess(android.os.Process.myPid());    super.onDestroy();  }  @Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    // TODO Auto-generated method stub    if (keyCode == KeyEvent.KEYCODE_BACK) {      finish();      return true;    }    return super.onKeyDown(keyCode, event);  }  // 更新后台数据  class MyThread implements Runnable {    public void run() {      try {        Thread.sleep(1000*3);      } catch (InterruptedException e) {        // TODO Auto-generated catch block        e.printStackTrace();      }      String msglist = "1";      Message msg = new Message();      Bundle b = new Bundle();// 存放数据      b.putString("rmsg", msglist);      msg.setData(b);      AllAppList.this.myHandler.sendMessage(msg); // 向Handler发送消息,更新UI    }  }  class MyHandler extends Handler {    private AllAppList mContext;    public MyHandler(Context conn,int a) {      mContext = (AllAppList)conn;    }    public MyHandler(Looper L) {      super(L);    }    // 子类必须重写此方法,接受数据    @Override    public void handleMessage(Message msg) {      // TODO Auto-generated method stub      super.handleMessage(msg);      Bundle b = msg.getData();      String rmsg = b.getString("rmsg");      if ("1".equals(rmsg)) {        // do nothing         List<Map> list = new ArrayList<Map>();         for(int i =0;i<16;i++){           n++;           Map map = new HashMap();            map.put("name", n);            list.add(map);         }        int pageNo = (int)Math.ceil( list.size()/APP_PAGE_SIZE);        for (int i = 0; i < pageNo; i++) {          GridView appPage = new GridView(mContext);          // get the "i" page data          appPage.setAdapter(new AppAdapter(mContext, list, i));          appPage.setNumColumns(2);          appPage.setOnItemClickListener(listener);          mScrollLayout.addView(appPage);        }        //加载分页        pageControl = (PageControlView) findViewById(R.id.pageControl);        pageControl.bindScrollViewGroup(mScrollLayout);        //加载分页数据        dataLoad.bindScrollViewGroup(mScrollLayout);        }      }    }  //分页数据  class DataLoading {    private int count;    public void bindScrollViewGroup(ScrollLayout scrollViewGroup) {      this.count=scrollViewGroup.getChildCount();      scrollViewGroup.setOnScreenChangeListenerDataLoad(new OnScreenChangeListenerDataLoad() {        public void onScreenChange(int currentIndex) {          // TODO Auto-generated method stub          generatePageControl(currentIndex);        }      });    }    private void generatePageControl(int currentIndex){      //如果到最后一页，就加载16条记录      if(count==currentIndex+1){        MyThread m = new MyThread();        new Thread(m).start();      }    }  }}

package cn.anycall.ju;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.ActivityNotFoundException;import android.content.Context;import android.content.Intent;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.view.KeyEvent;import android.view.View;import android.view.Window;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.Toast;import cn.anycall.ju.ScrollLayout.OnScreenChangeListenerDataLoad;/** * GridView分页显示安装的应用程序 */public class AllAppList extends Activity {  private ScrollLayout mScrollLayout;  private static final float APP_PAGE_SIZE = 4.0f;  private Context mContext;  private PageControlView pageControl;  public MyHandler myHandler;  public int n=0;  private DataLoading dataLoad;  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    this.requestWindowFeature(Window.FEATURE_NO_TITLE);    mContext = this;    setContentView(R.layout.main);    dataLoad = new DataLoading();    mScrollLayout = (ScrollLayout)findViewById(R.id.ScrollLayoutTest);    myHandler = new MyHandler(this,1);    //起一个线程更新数据    MyThread m = new MyThread();    new Thread(m).start();  }  /**   * gridView 的onItemLick响应事件   */  public OnItemClickListener listener = new OnItemClickListener() {    public void onItemClick(AdapterView<?> parent, View view, int position,        long id) {      // TODO Auto-generated method stub      System.out.println("position="+position);    }  };  @Override  protected void onDestroy() {    // TODO Auto-generated method stub    android.os.Process.killProcess(android.os.Process.myPid());    super.onDestroy();  }  @Override  public boolean onKeyDown(int keyCode, KeyEvent event) {    // TODO Auto-generated method stub    if (keyCode == KeyEvent.KEYCODE_BACK) {      finish();      return true;    }    return super.onKeyDown(keyCode, event);  }  // 更新后台数据  class MyThread implements Runnable {    public void run() {      try {        Thread.sleep(1000*3);      } catch (InterruptedException e) {        // TODO Auto-generated catch block        e.printStackTrace();      }      String msglist = "1";      Message msg = new Message();      Bundle b = new Bundle();// 存放数据      b.putString("rmsg", msglist);      msg.setData(b);      AllAppList.this.myHandler.sendMessage(msg); // 向Handler发送消息,更新UI    }  }  class MyHandler extends Handler {    private AllAppList mContext;    public MyHandler(Context conn,int a) {      mContext = (AllAppList)conn;    }    public MyHandler(Looper L) {      super(L);    }    // 子类必须重写此方法,接受数据    @Override    public void handleMessage(Message msg) {      // TODO Auto-generated method stub      super.handleMessage(msg);      Bundle b = msg.getData();      String rmsg = b.getString("rmsg");      if ("1".equals(rmsg)) {        // do nothing         List<Map> list = new ArrayList<Map>();         for(int i =0;i<16;i++){           n++;           Map map = new HashMap();            map.put("name", n);            list.add(map);         }        int pageNo = (int)Math.ceil( list.size()/APP_PAGE_SIZE);        for (int i = 0; i < pageNo; i++) {          GridView appPage = new GridView(mContext);          // get the "i" page data          appPage.setAdapter(new AppAdapter(mContext, list, i));          appPage.setNumColumns(2);          appPage.setOnItemClickListener(listener);          mScrollLayout.addView(appPage);        }        //加载分页        pageControl = (PageControlView) findViewById(R.id.pageControl);        pageControl.bindScrollViewGroup(mScrollLayout);        //加载分页数据        dataLoad.bindScrollViewGroup(mScrollLayout);        }      }    }  //分页数据  class DataLoading {    private int count;    public void bindScrollViewGroup(ScrollLayout scrollViewGroup) {      this.count=scrollViewGroup.getChildCount();      scrollViewGroup.setOnScreenChangeListenerDataLoad(new OnScreenChangeListenerDataLoad() {        public void onScreenChange(int currentIndex) {          // TODO Auto-generated method stub          generatePageControl(currentIndex);        }      });    }    private void generatePageControl(int currentIndex){      //如果到最后一页，就加载16条记录      if(count==currentIndex+1){        MyThread m = new MyThread();        new Thread(m).start();      }    }  }}

package cn.anycall.ju;import java.util.ArrayList;import java.util.List;import java.util.Map;import android.content.Context;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import cn.anycall.ju.R;public class AppAdapter extends BaseAdapter {  private List<Map> mList;  private Context mContext;  public static final int APP_PAGE_SIZE = 4;  private PackageManager pm;  public AppAdapter(Context context, List<Map> list, int page) {    mContext = context;    pm = context.getPackageManager();    mList = new ArrayList<Map>();    int i = page * APP_PAGE_SIZE;    int iEnd = i+APP_PAGE_SIZE;    while ((i<list.size()) && (i<iEnd)) {      mList.add(list.get(i));      i++;    }  }  public int getCount() {    // TODO Auto-generated method stub    return mList.size();  }  public Object getItem(int position) {    // TODO Auto-generated method stub    return mList.get(position);  }  public long getItemId(int position) {    // TODO Auto-generated method stub    return position;  }  public View getView(int position, View convertView, ViewGroup parent) {    // TODO Auto-generated method stub    Map appInfo = mList.get(position);    AppItem appItem;    if (convertView == null) {      View v = LayoutInflater.from(mContext).inflate(R.layout.app_item, null);      appItem = new AppItem();      appItem.mAppIcon = (ImageView)v.findViewById(R.id.imgdetail);      appItem.mAppName = (TextView)v.findViewById(R.id.tuaninfo);      v.setTag(appItem);      convertView = v;    } else {      appItem = (AppItem)convertView.getTag();    }    // set the icon    appItem.mAppIcon.setImageResource(R.drawable.icon);    // set the app name    appItem.mAppName.setText(appInfo.get("name").toString());    return convertView;  }  /**   * 每个应用显示的内容，包括图标和名称   * @author Yao.GUET   *   */  class AppItem {    ImageView mAppIcon;    TextView mAppName;  }}

package cn.anycall.ju;import java.util.ArrayList;import java.util.List;import java.util.Map;import android.content.Context;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import cn.anycall.ju.R;public class AppAdapter extends BaseAdapter {  private List<Map> mList;  private Context mContext;  public static final int APP_PAGE_SIZE = 4;  private PackageManager pm;  public AppAdapter(Context context, List<Map> list, int page) {    mContext = context;    pm = context.getPackageManager();    mList = new ArrayList<Map>();    int i = page * APP_PAGE_SIZE;    int iEnd = i+APP_PAGE_SIZE;    while ((i<list.size()) && (i<iEnd)) {      mList.add(list.get(i));      i++;    }  }  public int getCount() {    // TODO Auto-generated method stub    return mList.size();  }  public Object getItem(int position) {    // TODO Auto-generated method stub    return mList.get(position);  }  public long getItemId(int position) {    // TODO Auto-generated method stub    return position;  }  public View getView(int position, View convertView, ViewGroup parent) {    // TODO Auto-generated method stub    Map appInfo = mList.get(position);    AppItem appItem;    if (convertView == null) {      View v = LayoutInflater.from(mContext).inflate(R.layout.app_item, null);      appItem = new AppItem();      appItem.mAppIcon = (ImageView)v.findViewById(R.id.imgdetail);      appItem.mAppName = (TextView)v.findViewById(R.id.tuaninfo);      v.setTag(appItem);      convertView = v;    } else {      appItem = (AppItem)convertView.getTag();    }    // set the icon    appItem.mAppIcon.setImageResource(R.drawable.icon);    // set the app name    appItem.mAppName.setText(appInfo.get("name").toString());    return convertView;  }  /**   * 每个应用显示的内容，包括图标和名称   * @author Yao.GUET   *   */  class AppItem {    ImageView mAppIcon;    TextView mAppName;  }}

package cn.anycall.ju;import android.content.Context;import android.util.AttributeSet;import android.widget.ImageView;import android.widget.LinearLayout;import cn.anycall.ju.R;import cn.anycall.ju.ScrollLayout.OnScreenChangeListener;public class PageControlView extends LinearLayout {  private Context context;  private int count;  public void bindScrollViewGroup(ScrollLayout scrollViewGroup) {    this.count=scrollViewGroup.getChildCount();    System.out.println("count="+count);    generatePageControl(scrollViewGroup.getCurrentScreenIndex());    scrollViewGroup.setOnScreenChangeListener(new OnScreenChangeListener() {      public void onScreenChange(int currentIndex) {        // TODO Auto-generated method stub        generatePageControl(currentIndex);      }    });  }  public PageControlView(Context context) {    super(context);    this.init(context);  }  public PageControlView(Context context, AttributeSet attrs) {    super(context, attrs);    this.init(context);  }  private void init(Context context) {    this.context=context;  }  private void generatePageControl(int currentIndex) {    this.removeAllViews();    int pageNum = 6; // 显示多少个    int pageNo = currentIndex+1; //第几页    int pageSum = this.count; //总共多少页    if(pageSum>1){      int currentNum = (pageNo % pageNum == 0 ? (pageNo / pageNum) - 1           : (int) (pageNo / pageNum))           * pageNum;       if (currentNum < 0)         currentNum = 0;       if (pageNo > pageNum){         ImageView imageView = new ImageView(context);         imageView.setImageResource(R.drawable.zuo);         this.addView(imageView);       }       for (int i = 0; i < pageNum; i++) {         if ((currentNum + i + 1) > pageSum || pageSum < 2)           break;         ImageView imageView = new ImageView(context);         if(currentNum + i + 1 == pageNo){           imageView.setImageResource(R.drawable.page_indicator_focused);         }else{           imageView.setImageResource(R.drawable.page_indicator);         }         this.addView(imageView);       }       if (pageSum > (currentNum + pageNum)) {         ImageView imageView = new ImageView(context);         imageView.setImageResource(R.drawable.you);         this.addView(imageView);       }    }  }}

package cn.anycall.ju;import android.content.Context;import android.util.AttributeSet;import android.widget.ImageView;import android.widget.LinearLayout;import cn.anycall.ju.R;import cn.anycall.ju.ScrollLayout.OnScreenChangeListener;public class PageControlView extends LinearLayout {  private Context context;  private int count;  public void bindScrollViewGroup(ScrollLayout scrollViewGroup) {    this.count=scrollViewGroup.getChildCount();    System.out.println("count="+count);    generatePageControl(scrollViewGroup.getCurrentScreenIndex());    scrollViewGroup.setOnScreenChangeListener(new OnScreenChangeListener() {      public void onScreenChange(int currentIndex) {        // TODO Auto-generated method stub        generatePageControl(currentIndex);      }    });  }  public PageControlView(Context context) {    super(context);    this.init(context);  }  public PageControlView(Context context, AttributeSet attrs) {    super(context, attrs);    this.init(context);  }  private void init(Context context) {    this.context=context;  }  private void generatePageControl(int currentIndex) {    this.removeAllViews();    int pageNum = 6; // 显示多少个    int pageNo = currentIndex+1; //第几页    int pageSum = this.count; //总共多少页    if(pageSum>1){      int currentNum = (pageNo % pageNum == 0 ? (pageNo / pageNum) - 1           : (int) (pageNo / pageNum))           * pageNum;       if (currentNum < 0)         currentNum = 0;       if (pageNo > pageNum){         ImageView imageView = new ImageView(context);         imageView.setImageResource(R.drawable.zuo);         this.addView(imageView);       }       for (int i = 0; i < pageNum; i++) {         if ((currentNum + i + 1) > pageSum || pageSum < 2)           break;         ImageView imageView = new ImageView(context);         if(currentNum + i + 1 == pageNo){           imageView.setImageResource(R.drawable.page_indicator_focused);         }else{           imageView.setImageResource(R.drawable.page_indicator);         }         this.addView(imageView);       }       if (pageSum > (currentNum + pageNum)) {         ImageView imageView = new ImageView(context);         imageView.setImageResource(R.drawable.you);         this.addView(imageView);       }    }  }}

package cn.anycall.ju;import android.content.Context;import android.graphics.Canvas;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.widget.Scroller;/** * 仿Launcher中的WorkSapce，可以左右滑动切换屏幕的类 * */public class ScrollLayout extends ViewGroup {  private static final String TAG = "ScrollLayout";  private Scroller mScroller;  private VelocityTracker mVelocityTracker;  private int mCurScreen;  private int mDefaultScreen = 0;  private static final int TOUCH_STATE_REST = 0;  private static final int TOUCH_STATE_SCROLLING = 1;  private static final int SNAP_VELOCITY = 600;  private int mTouchState = TOUCH_STATE_REST;  private int mTouchSlop;  private float mLastMotionX;  private float mLastMotionY;  private int currentScreenIndex = 0;  public int getCurrentScreenIndex() {    return currentScreenIndex;  }  public void setCurrentScreenIndex(int currentScreenIndex) {    this.currentScreenIndex = currentScreenIndex;  }  public ScrollLayout(Context context, AttributeSet attrs) {    this(context, attrs, 0);    // TODO Auto-generated constructor stub  }  public ScrollLayout(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    // TODO Auto-generated constructor stub    mScroller = new Scroller(context);    mCurScreen = mDefaultScreen;    mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();  }  @Override  protected void onLayout(boolean changed, int l, int t, int r, int b) {    // TODO Auto-generated method stub    int childLeft = 0;    final int childCount = getChildCount();    System.out.println("childCount=" + childCount);    for (int i = 0; i < childCount; i++) {      final View childView = getChildAt(i);      if (childView.getVisibility() != View.GONE) {        final int childWidth = childView.getMeasuredWidth();        childView.layout(childLeft, 0, childLeft + childWidth,            childView.getMeasuredHeight());        childLeft += childWidth;      }    }  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    Log.e(TAG, "onMeasure");    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    final int width = MeasureSpec.getSize(widthMeasureSpec);    final int widthMode = MeasureSpec.getMode(widthMeasureSpec);    if (widthMode != MeasureSpec.EXACTLY) {      throw new IllegalStateException(          "ScrollLayout only canmCurScreen run at EXACTLY mode!");    }    final int heightMode = MeasureSpec.getMode(heightMeasureSpec);    if (heightMode != MeasureSpec.EXACTLY) {      throw new IllegalStateException(          "ScrollLayout only can run at EXACTLY mode!");    }    // The children are given the same width and height as the scrollLayout    final int count = getChildCount();    for (int i = 0; i < count; i++) {      getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);    }    System.out.println("moving to screen " + mCurScreen);    scrollTo(mCurScreen * width, 0);  }  /**   * According to the position of current layout scroll to the destination   * page.   */  public void snapToDestination() {    final int screenWidth = getWidth();    final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;    snapToScreen(destScreen);  }  public void snapToScreen(int whichScreen) {    // get the valid layout page    whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));    if (getScrollX() != (whichScreen * getWidth())) {      final int delta = whichScreen * getWidth() - getScrollX();      mScroller.startScroll(getScrollX(), 0, delta, 0,          Math.abs(delta) * 2);      mCurScreen = whichScreen;      invalidate(); // Redraw the layout    }  }  public void setToScreen(int whichScreen) {    whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));    mCurScreen = whichScreen;    scrollTo(whichScreen * getWidth(), 0);  }  public int getCurScreen() {    return mCurScreen;  }  @Override  public void computeScroll() {    // TODO Auto-generated method stub    if (mScroller.computeScrollOffset()) {      scrollTo(mScroller.getCurrX(), mScroller.getCurrY());      postInvalidate();    }  }  @Override  public boolean onTouchEvent(MotionEvent event) {    // TODO Auto-generated method stub    if (mVelocityTracker == null) {      mVelocityTracker = VelocityTracker.obtain();    }    mVelocityTracker.addMovement(event);    final int action = event.getAction();    final float x = event.getX();    final float y = event.getY();    switch (action) {    case MotionEvent.ACTION_DOWN:      Log.e(TAG, "event down!");      if (!mScroller.isFinished()) {        mScroller.abortAnimation();      }      mLastMotionX = x;      break;    case MotionEvent.ACTION_MOVE:      int deltaX = (int) (mLastMotionX - x);      mLastMotionX = x;      scrollBy(deltaX, 0);      break;    case MotionEvent.ACTION_UP:      Log.e(TAG, "event : up");      // if (mTouchState == TOUCH_STATE_SCROLLING) {      final VelocityTracker velocityTracker = mVelocityTracker;      velocityTracker.computeCurrentVelocity(1000);      int velocityX = (int) velocityTracker.getXVelocity();      Log.e(TAG, "velocityX:" + velocityX);      if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {        // Fling enough to move left        Log.e(TAG, "snap left");        onScreenChangeListener.onScreenChange(mCurScreen - 1);        System.out.println("mCurScreen=" + (mCurScreen - 1));        snapToScreen(mCurScreen - 1);      } else if (velocityX < -SNAP_VELOCITY          && mCurScreen < getChildCount() - 1) {        // Fling enough to move right        Log.e(TAG, "snap right");        onScreenChangeListener.onScreenChange(mCurScreen + 1);        //只往右移动才加载数据        onScreenChangeListenerDataLoad.onScreenChange(mCurScreen+1);        snapToScreen(mCurScreen + 1);      } else {        snapToDestination();      }      if (mVelocityTracker != null) {        mVelocityTracker.recycle();        mVelocityTracker = null;      }      // }      mTouchState = TOUCH_STATE_REST;      break;    case MotionEvent.ACTION_CANCEL:      mTouchState = TOUCH_STATE_REST;      break;    }    return true;  }  @Override  public boolean onInterceptTouchEvent(MotionEvent ev) {    // TODO Auto-generated method stub    Log.e(TAG, "onInterceptTouchEvent-slop:" + mTouchSlop);    final int action = ev.getAction();    if ((action == MotionEvent.ACTION_MOVE)        && (mTouchState != TOUCH_STATE_REST)) {      return true;    }    final float x = ev.getX();    final float y = ev.getY();    switch (action) {    case MotionEvent.ACTION_MOVE:      final int xDiff = (int) Math.abs(mLastMotionX - x);      if (xDiff > mTouchSlop) {        mTouchState = TOUCH_STATE_SCROLLING;      }      break;    case MotionEvent.ACTION_DOWN:      mLastMotionX = x;      mLastMotionY = y;      mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST          : TOUCH_STATE_SCROLLING;      break;    case MotionEvent.ACTION_CANCEL:    case MotionEvent.ACTION_UP:      mTouchState = TOUCH_STATE_REST;      break;    }    return mTouchState != TOUCH_STATE_REST;  }  //分页监听  public interface OnScreenChangeListener {    void onScreenChange(int currentIndex);  }  private OnScreenChangeListener onScreenChangeListener;  public void setOnScreenChangeListener(      OnScreenChangeListener onScreenChangeListener) {    this.onScreenChangeListener = onScreenChangeListener;  }  //动态数据监听  public interface OnScreenChangeListenerDataLoad {    void onScreenChange(int currentIndex);  }  private OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad;  public void setOnScreenChangeListenerDataLoad(OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad) {    this.onScreenChangeListenerDataLoad = onScreenChangeListenerDataLoad;  }}

package cn.anycall.ju;import android.content.Context;import android.graphics.Canvas;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.widget.Scroller;/** * 仿Launcher中的WorkSapce，可以左右滑动切换屏幕的类 * */public class ScrollLayout extends ViewGroup {  private static final String TAG = "ScrollLayout";  private Scroller mScroller;  private VelocityTracker mVelocityTracker;  private int mCurScreen;  private int mDefaultScreen = 0;  private static final int TOUCH_STATE_REST = 0;  private static final int TOUCH_STATE_SCROLLING = 1;  private static final int SNAP_VELOCITY = 600;  private int mTouchState = TOUCH_STATE_REST;  private int mTouchSlop;  private float mLastMotionX;  private float mLastMotionY;  private int currentScreenIndex = 0;  public int getCurrentScreenIndex() {    return currentScreenIndex;  }  public void setCurrentScreenIndex(int currentScreenIndex) {    this.currentScreenIndex = currentScreenIndex;  }  public ScrollLayout(Context context, AttributeSet attrs) {    this(context, attrs, 0);    // TODO Auto-generated constructor stub  }  public ScrollLayout(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    // TODO Auto-generated constructor stub    mScroller = new Scroller(context);    mCurScreen = mDefaultScreen;    mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();  }  @Override  protected void onLayout(boolean changed, int l, int t, int r, int b) {    // TODO Auto-generated method stub    int childLeft = 0;    final int childCount = getChildCount();    System.out.println("childCount=" + childCount);    for (int i = 0; i < childCount; i++) {      final View childView = getChildAt(i);      if (childView.getVisibility() != View.GONE) {        final int childWidth = childView.getMeasuredWidth();        childView.layout(childLeft, 0, childLeft + childWidth,            childView.getMeasuredHeight());        childLeft += childWidth;      }    }  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    Log.e(TAG, "onMeasure");    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    final int width = MeasureSpec.getSize(widthMeasureSpec);    final int widthMode = MeasureSpec.getMode(widthMeasureSpec);    if (widthMode != MeasureSpec.EXACTLY) {      throw new IllegalStateException(          "ScrollLayout only canmCurScreen run at EXACTLY mode!");    }    final int heightMode = MeasureSpec.getMode(heightMeasureSpec);    if (heightMode != MeasureSpec.EXACTLY) {      throw new IllegalStateException(          "ScrollLayout only can run at EXACTLY mode!");    }    // The children are given the same width and height as the scrollLayout    final int count = getChildCount();    for (int i = 0; i < count; i++) {      getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);    }    System.out.println("moving to screen " + mCurScreen);    scrollTo(mCurScreen * width, 0);  }  /**   * According to the position of current layout scroll to the destination   * page.   */  public void snapToDestination() {    final int screenWidth = getWidth();    final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;    snapToScreen(destScreen);  }  public void snapToScreen(int whichScreen) {    // get the valid layout page    whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));    if (getScrollX() != (whichScreen * getWidth())) {      final int delta = whichScreen * getWidth() - getScrollX();      mScroller.startScroll(getScrollX(), 0, delta, 0,          Math.abs(delta) * 2);      mCurScreen = whichScreen;      invalidate(); // Redraw the layout    }  }  public void setToScreen(int whichScreen) {    whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));    mCurScreen = whichScreen;    scrollTo(whichScreen * getWidth(), 0);  }  public int getCurScreen() {    return mCurScreen;  }  @Override  public void computeScroll() {    // TODO Auto-generated method stub    if (mScroller.computeScrollOffset()) {      scrollTo(mScroller.getCurrX(), mScroller.getCurrY());      postInvalidate();    }  }  @Override  public boolean onTouchEvent(MotionEvent event) {    // TODO Auto-generated method stub    if (mVelocityTracker == null) {      mVelocityTracker = VelocityTracker.obtain();    }    mVelocityTracker.addMovement(event);    final int action = event.getAction();    final float x = event.getX();    final float y = event.getY();    switch (action) {    case MotionEvent.ACTION_DOWN:      Log.e(TAG, "event down!");      if (!mScroller.isFinished()) {        mScroller.abortAnimation();      }      mLastMotionX = x;      break;    case MotionEvent.ACTION_MOVE:      int deltaX = (int) (mLastMotionX - x);      mLastMotionX = x;      scrollBy(deltaX, 0);      break;    case MotionEvent.ACTION_UP:      Log.e(TAG, "event : up");      // if (mTouchState == TOUCH_STATE_SCROLLING) {      final VelocityTracker velocityTracker = mVelocityTracker;      velocityTracker.computeCurrentVelocity(1000);      int velocityX = (int) velocityTracker.getXVelocity();      Log.e(TAG, "velocityX:" + velocityX);      if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {        // Fling enough to move left        Log.e(TAG, "snap left");        onScreenChangeListener.onScreenChange(mCurScreen - 1);        System.out.println("mCurScreen=" + (mCurScreen - 1));        snapToScreen(mCurScreen - 1);      } else if (velocityX < -SNAP_VELOCITY          && mCurScreen < getChildCount() - 1) {        // Fling enough to move right        Log.e(TAG, "snap right");        onScreenChangeListener.onScreenChange(mCurScreen + 1);        //只往右移动才加载数据        onScreenChangeListenerDataLoad.onScreenChange(mCurScreen+1);        snapToScreen(mCurScreen + 1);      } else {        snapToDestination();      }      if (mVelocityTracker != null) {        mVelocityTracker.recycle();        mVelocityTracker = null;      }      // }      mTouchState = TOUCH_STATE_REST;      break;    case MotionEvent.ACTION_CANCEL:      mTouchState = TOUCH_STATE_REST;      break;    }    return true;  }  @Override  public boolean onInterceptTouchEvent(MotionEvent ev) {    // TODO Auto-generated method stub    Log.e(TAG, "onInterceptTouchEvent-slop:" + mTouchSlop);    final int action = ev.getAction();    if ((action == MotionEvent.ACTION_MOVE)        && (mTouchState != TOUCH_STATE_REST)) {      return true;    }    final float x = ev.getX();    final float y = ev.getY();    switch (action) {    case MotionEvent.ACTION_MOVE:      final int xDiff = (int) Math.abs(mLastMotionX - x);      if (xDiff > mTouchSlop) {        mTouchState = TOUCH_STATE_SCROLLING;      }      break;    case MotionEvent.ACTION_DOWN:      mLastMotionX = x;      mLastMotionY = y;      mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST          : TOUCH_STATE_SCROLLING;      break;    case MotionEvent.ACTION_CANCEL:    case MotionEvent.ACTION_UP:      mTouchState = TOUCH_STATE_REST;      break;    }    return mTouchState != TOUCH_STATE_REST;  }  //分页监听  public interface OnScreenChangeListener {    void onScreenChange(int currentIndex);  }  private OnScreenChangeListener onScreenChangeListener;  public void setOnScreenChangeListener(      OnScreenChangeListener onScreenChangeListener) {    this.onScreenChangeListener = onScreenChangeListener;  }  //动态数据监听  public interface OnScreenChangeListenerDataLoad {    void onScreenChange(int currentIndex);  }  private OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad;  public void setOnScreenChangeListenerDataLoad(OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad) {    this.onScreenChangeListenerDataLoad = onScreenChangeListenerDataLoad;  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  >  <TextView android:layout_width="fill_parent"    android:layout_height="wrap_content" android:text="仿淘宝聚划算"/><RelativeLayout  android:id="@+id/myView"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  ><cn.anycall.ju.ScrollLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ScrollLayoutTest" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" ></cn.anycall.ju.ScrollLayout><cn.anycall.ju.PageControlView        android:id="@+id/pageControl"        android:layout_width="fill_parent"        android:layout_height="40px"        android:background="#8f00000f"        android:layout_alignParentBottom="true"        android:gravity="center"/></RelativeLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  >  <TextView android:layout_width="fill_parent"    android:layout_height="wrap_content" android:text="仿淘宝聚划算"/><RelativeLayout  android:id="@+id/myView"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  ><cn.anycall.ju.ScrollLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ScrollLayoutTest" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" ></cn.anycall.ju.ScrollLayout><cn.anycall.ju.PageControlView        android:id="@+id/pageControl"        android:layout_width="fill_parent"        android:layout_height="40px"        android:background="#8f00000f"        android:layout_alignParentBottom="true"        android:gravity="center"/></RelativeLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="wrap_content"><RelativeLayout android:id="@+id/alllayout" android:layout_width="wrap_content" android:layout_height="wrap_content">   <RelativeLayout android:id="@+id/imglayout" android:layout_width="160dp" android:layout_height="160dp" android:background="@drawable/mer_border">        <ImageView android:id="@+id/imgdetail" android:layout_width="145dp" android:layout_height="145dp" android:layout_margin="8dp" />        <TextView android:id="@+id/price" android:layout_width="180dp" android:layout_height="wrap_content" android:text="12345" android:layout_alignParentBottom="true" android:background="#C02000" android:textColor="#FFFFFF"/>        <TextView android:id="@+id/look" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="去看看" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:background="#C02000" android:textColor="#FFFFFF"/>   </RelativeLayout>   <TextView android:id="@+id/tuaninfo" android:layout_width="fill_parent"   android:layout_height="wrap_content" android:textSize="16dp"   android:maxLines="2" android:layout_below="@id/imglayout"    android:ellipsize="end" android:text="dddddddddd"/>"</RelativeLayout></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="wrap_content"><RelativeLayout android:id="@+id/alllayout" android:layout_width="wrap_content" android:layout_height="wrap_content">   <RelativeLayout android:id="@+id/imglayout" android:layout_width="160dp" android:layout_height="160dp" android:background="@drawable/mer_border">        <ImageView android:id="@+id/imgdetail" android:layout_width="145dp" android:layout_height="145dp" android:layout_margin="8dp" />        <TextView android:id="@+id/price" android:layout_width="180dp" android:layout_height="wrap_content" android:text="12345" android:layout_alignParentBottom="true" android:background="#C02000" android:textColor="#FFFFFF"/>        <TextView android:id="@+id/look" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="去看看" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:background="#C02000" android:textColor="#FFFFFF"/>   </RelativeLayout>   <TextView android:id="@+id/tuaninfo" android:layout_width="fill_parent"   android:layout_height="wrap_content" android:textSize="16dp"   android:maxLines="2" android:layout_below="@id/imglayout"    android:ellipsize="end" android:text="dddddddddd"/>"</RelativeLayout></RelativeLayout>