android左右滑动加载分页以及动态加载数据
16lz
2021-12-31
您还未登录 ! 我的应用 登录 注册 论坛首页 → 移动编程和手机应用开发版 → Android →
主题:android左右滑动加载分页以及动态加载数据 精华帖 (1) :: 良好帖 (0) :: 新手帖 (1) :: 隐藏帖 (0) | |
---|---|
作者 | 正文 |
android UI 往右滑动,滑动到最后一页就自动加载数据并显示 如图: Java代码
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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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 stubSystem.out.println("position="+position);}};@Overrideprotected void onDestroy() {// TODO Auto-generated method stubandroid.os.Process.killProcess(android.os.Process.myPid());super.onDestroy();}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif (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 blocke.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@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.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 dataappPage.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 stubgeneratePageControl(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();}}}} Java代码
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 stubreturn mList.size();}public Object getItem(int position) {// TODO Auto-generated method stubreturn mList.get(position);}public long getItemId(int position) {// TODO Auto-generated method stubreturn position;}public View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubMap 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 iconappItem.mAppIcon.setImageResource(R.drawable.icon);// set the app nameappItem.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;}} Java代码
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 stubgeneratePageControl(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); }}}} Java代码
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 stubmScroller = new Scroller(context);mCurScreen = mDefaultScreen;mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {// TODO Auto-generated method stubint 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;}}}@Overrideprotected 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 scrollLayoutfinal 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 pagewhichScreen = 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;}@Overridepublic void computeScroll() {// TODO Auto-generated method stubif (mScroller.computeScrollOffset()) {scrollTo(mScroller.getCurrX(), mScroller.getCurrY());postInvalidate();}}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubif (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 leftLog.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 rightLog.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;}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubLog.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;}} main.xml Xml代码
<?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"/><RelativeLayoutandroid: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> app_item.xml Xml代码
<?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> 程序下载包如下:
| |
| |
| |
更多相关文章
- 关于Android短信管理
- Android入门(4) 布局、JUnit、日志与数据存储访问方式
- 总结Content Provider的使用
- 快速上手Android数据库操作
- Intent机制详解
- Android(安卓)音频框架概述(一)之 AudioTrack
- Android(安卓)的视频编码 H263 MP4V H264
- Android读写文件正确实行方法介绍
- mybatisplus的坑 insert标签insert into select无参数问题的解决