Android ListView 下拉刷新 点击加载更多

最近项目中用到了ListView的下拉刷新的功能，总结了一下前辈们的代码，单独抽取出来写了一个demo作为示例。

效果图

下拉刷新：

加载更多：

CustomListView.java

package com.example.uitest.view;import java.util.Date;import com.example.uitest.R;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.LinearInterpolator;import android.view.animation.RotateAnimation;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;/** * ListView下拉刷新 * */public class CustomListView extends ListView implements OnScrollListener {private final static int RELEASE_To_REFRESH = 0;private final static int PULL_To_REFRESH = 1;private final static int REFRESHING = 2;private final static int DONE = 3;private final static int LOADING = 4;// 实际的padding的距离与界面上偏移距离的比例private final static int RATIO = 3;private LayoutInflater inflater;private LinearLayout headView;private TextView tipsTextview;private TextView lastUpdatedTextView;private ImageView arrowImageView;private ProgressBar progressBar;private RotateAnimation animation;private RotateAnimation reverseAnimation;// 用于保证startY的值在一个完整的touch事件中只被记录一次private boolean isRecored;private int headContentWidth;private int headContentHeight;private int startY;private int firstItemIndex;private int state;private boolean isBack;private OnRefreshListener refreshListener;private OnLoadListener loadListener;private boolean isRefreshable;private ProgressBar moreProgressBar;private TextView loadMoreView;private View moreView;public CustomListView(Context context) {super(context);init(context);}public CustomListView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}private void init(Context context) {setCacheColorHint(context.getResources().getColor(R.color.transparent));inflater = LayoutInflater.from(context);headView = (LinearLayout) inflater.inflate(R.layout.head, null);arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);arrowImageView.setMinimumWidth(70);arrowImageView.setMinimumHeight(50);progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);measureView(headView);headContentHeight = headView.getMeasuredHeight();headContentWidth = headView.getMeasuredWidth();headView.setPadding(0, -1 * headContentHeight, 0, 0);headView.invalidate();Log.v("size", "width:" + headContentWidth + " height:" + headContentHeight);addHeaderView(headView, null, false);setOnScrollListener(this);animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);animation.setInterpolator(new LinearInterpolator());animation.setDuration(250);animation.setFillAfter(true);reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);reverseAnimation.setInterpolator(new LinearInterpolator());reverseAnimation.setDuration(200);reverseAnimation.setFillAfter(true);state = DONE;isRefreshable = false;moreView = LayoutInflater.from(context).inflate(R.layout.listfooter_more, null);moreView.setVisibility(View.VISIBLE);moreProgressBar = (ProgressBar) moreView.findViewById(R.id.pull_to_refresh_progress);loadMoreView = (TextView) moreView.findViewById(R.id.load_more);moreView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {onLoad();}});addFooterView(moreView);}public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2, int arg3) {firstItemIndex = firstVisiableItem;}public void onScrollStateChanged(AbsListView arg0, int arg1) {}public boolean onTouchEvent(MotionEvent event) {if (isRefreshable) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:if (firstItemIndex == 0 && !isRecored) {isRecored = true;startY = (int) event.getY();}break;case MotionEvent.ACTION_UP:if (state != REFRESHING && state != LOADING) {if (state == DONE) {}if (state == PULL_To_REFRESH) {state = DONE;changeHeaderViewByState();}if (state == RELEASE_To_REFRESH) {state = REFRESHING;changeHeaderViewByState();onRefresh();}}isRecored = false;isBack = false;break;case MotionEvent.ACTION_MOVE:int tempY = (int) event.getY();if (!isRecored && firstItemIndex == 0) {isRecored = true;startY = tempY;}if (state != REFRESHING && isRecored && state != LOADING) {// 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动// 可以松手去刷新了if (state == RELEASE_To_REFRESH) {setSelection(0);// 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();}// 一下子推到顶了else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();}// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步}// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态if (state == PULL_To_REFRESH) {setSelection(0);// 下拉到可以进入RELEASE_TO_REFRESH的状态if ((tempY - startY) / RATIO >= headContentHeight) {state = RELEASE_To_REFRESH;isBack = true;changeHeaderViewByState();}else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();}}if (state == DONE) {if (tempY - startY > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();}}if (state == PULL_To_REFRESH) {headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0);}if (state == RELEASE_To_REFRESH) {headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0);}}break;}}return super.onTouchEvent(event);}// 当状态改变时候，调用该方法，以更新界面private void changeHeaderViewByState() {switch (state) {case RELEASE_To_REFRESH:arrowImageView.setVisibility(View.VISIBLE);progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.startAnimation(animation);tipsTextview.setText("松开刷新");break;case PULL_To_REFRESH:progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.VISIBLE);// 是由RELEASE_To_REFRESH状态转变来的if (isBack) {isBack = false;arrowImageView.clearAnimation();arrowImageView.startAnimation(reverseAnimation);tipsTextview.setText("下拉刷新");} else {tipsTextview.setText("下拉刷新");}break;case REFRESHING:headView.setPadding(0, 0, 0, 0);progressBar.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.GONE);tipsTextview.setText("正在刷新...");lastUpdatedTextView.setVisibility(View.VISIBLE);break;case DONE:headView.setPadding(0, -1 * headContentHeight, 0, 0);progressBar.setVisibility(View.GONE);arrowImageView.clearAnimation();arrowImageView.setImageResource(R.drawable.arrow);tipsTextview.setText("下拉刷新");lastUpdatedTextView.setVisibility(View.VISIBLE);break;}}public void setonRefreshListener(OnRefreshListener refreshListener) {this.refreshListener = refreshListener;isRefreshable = true;}public void setonLoadListener(OnLoadListener loadListener) {this.loadListener = loadListener;}public interface OnRefreshListener {public void onRefresh();}public interface OnLoadListener {public void onLoad();}@SuppressWarnings("deprecation")public void onRefreshComplete() {state = DONE;lastUpdatedTextView.setText("最近更新:" + new Date().toLocaleString());changeHeaderViewByState();}private void onLoad() {if (loadListener != null) {moreProgressBar.setVisibility(View.VISIBLE);loadMoreView.setText(getContext().getString(R.string.load_more));loadListener.onLoad();}}public void onLoadComplete() {//moreView.setVisibility(View.GONE);moreProgressBar.setVisibility(View.GONE);loadMoreView.setText(getContext().getString(R.string.more_data));}private void onRefresh() {if (refreshListener != null) {refreshListener.onRefresh();}}private void measureView(View child) {ViewGroup.LayoutParams p = child.getLayoutParams();if (p == null) {p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);}int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);int lpHeight = p.height;int childHeightSpec;if (lpHeight > 0) {childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);} else {childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);}child.measure(childWidthSpec, childHeightSpec);}@SuppressWarnings("deprecation")public void setAdapter(BaseAdapter adapter) {lastUpdatedTextView.setText("最近更新:" + new Date().toLocaleString());super.setAdapter(adapter);}}

在 CustomListView 中有2个回调接口，OnRefreshListener 和 OnLoadListener ，分别对应 下拉和点击加载更多 时候的回调函数。在下拉刷新完成之后要调用 mListView.onRefreshComplete(); 来隐藏掉 头部，调用 mListView.onLoadComplete(); 隐藏掉 底部的加载view。

header.xml

<?xml version="1.0" encoding="utf-8"?><!-- ListView的头部 --><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content" >    <!-- 内容 -->    <RelativeLayout        android:id="@+id/head_contentLayout"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:paddingLeft="30dp" >        <!-- 箭头图像、进度条 -->        <FrameLayout            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_centerVertical="true" >            <!-- 箭头 -->            <ImageView                android:id="@+id/head_arrowImageView"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:contentDescription="@string/app_name"                android:src="@drawable/arrow" />            <!-- 进度条 -->            <ProgressBar                android:id="@+id/head_progressBar"                style="?android:attr/progressBarStyleSmall"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:indeterminateDrawable="@drawable/progressbar_bg"                android:visibility="gone" />        </FrameLayout>        <!-- 提示、最近更新 -->        <LinearLayout            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerHorizontal="true"            android:gravity="center_horizontal"            android:orientation="vertical" >            <!-- 提示 -->            <TextView                android:id="@+id/head_tipsTextView"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/pull_to_refresh_pull_label"                android:textColor="@color/pull_refresh_textview"                android:textSize="20sp" />            <!-- 最近更新 -->            <TextView                android:id="@+id/head_lastUpdatedTextView"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="@string/pull_to_refresh_refresh_lasttime"                android:textColor="@color/gold"                android:textSize="10sp" />        </LinearLayout>    </RelativeLayout></LinearLayout>

listfooter_more.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center_horizontal"    android:orientation="horizontal"    android:padding="15dp"     >    <ProgressBar        android:id="@+id/pull_to_refresh_progress"        style="@android:style/Widget.ProgressBar.Small.Inverse"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center"        android:indeterminate="true"        android:visibility="gone" >    </ProgressBar>    <TextView        android:id="@+id/load_more"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10.0dp"        android:gravity="center"        android:text="@string/more_data"        android:textColor="@color/black" >    </TextView></LinearLayout>

MainActivity.java

package com.example.uitest;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Context;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.example.uitest.model.AppInfo;import com.example.uitest.view.CustomListView;import com.example.uitest.view.CustomListView.OnLoadListener;import com.example.uitest.view.CustomListView.OnRefreshListener;public class MainActivity extends Activity {private static final String TAG = MainActivity.class.getSimpleName();private static final int LOAD_DATA_FINISH = 10;private static final int REFRESH_DATA_FINISH = 11;private List<AppInfo> mList = new ArrayList<AppInfo>();private CustomListAdapter mAdapter;private CustomListView mListView;private int count = 10;private Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {switch (msg.what) {case REFRESH_DATA_FINISH:if(mAdapter!=null){mAdapter.notifyDataSetChanged();}mListView.onRefreshComplete();//下拉刷新完成break;case LOAD_DATA_FINISH:if(mAdapter!=null){mAdapter.notifyDataSetChanged();}mListView.onLoadComplete();//加载更多完成break;default:break;}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);buildAppData();mAdapter = new CustomListAdapter(this);mListView = (CustomListView) findViewById(R.id.mListView);mListView.setAdapter(mAdapter);mListView.setonRefreshListener(new OnRefreshListener() {@Overridepublic void onRefresh() {//TODO 下拉刷新Log.e(TAG, "onRefresh");loadData(0);}});mListView.setonLoadListener(new OnLoadListener() {@Overridepublic void onLoad() {//TODO 加载更多Log.e(TAG, "onLoad");loadData(1);}});mListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {Log.e(TAG, "click position:" + position);}});}public void loadData(final int type){new Thread(){@Overridepublic void run() {for(int i=count;i<count+10;i++){AppInfo ai = new AppInfo();ai.setAppIcon(BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher));ai.setAppName("应用Demo_" + i);ai.setAppVer("版本: " + (i % 10 + 1) + "." + (i % 8 + 2) + "."+ (i % 6 + 3));ai.setAppSize("大小: " + i * 10 + "MB");mList.add(ai);}count += 10;try {Thread.sleep(300);} catch (InterruptedException e) {e.printStackTrace();}if(type==0){//下拉刷新//Collections.reverse(mList);//逆序handler.sendEmptyMessage(REFRESH_DATA_FINISH);}else if(type==1){handler.sendEmptyMessage(LOAD_DATA_FINISH);}}}.start();}/** * 初始化应用数据 */private void buildAppData() {for (int i = 0; i < 10; i++) {AppInfo ai = new AppInfo();ai.setAppIcon(BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher));ai.setAppName("应用Demo_" + i);ai.setAppVer("版本: " + (i % 10 + 1) + "." + (i % 8 + 2) + "."+ (i % 6 + 3));ai.setAppSize("大小: " + i * 10 + "MB");mList.add(ai);}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}public class CustomListAdapter extends BaseAdapter {private LayoutInflater mInflater;public CustomListAdapter(Context context) {mInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {return mList.size();}@Overridepublic Object getItem(int arg0) {return mList.get(arg0);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (getCount() == 0) {return null;}ViewHolder holder = null;if (convertView == null) {convertView = mInflater.inflate(R.layout.list_item, null);holder = new ViewHolder();holder.ivImage = (ImageView) convertView.findViewById(R.id.ivIcon);holder.tvName = (TextView) convertView.findViewById(R.id.tvName);holder.tvVer = (TextView) convertView.findViewById(R.id.tvVer);holder.tvSize = (TextView) convertView.findViewById(R.id.tvSize);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}AppInfo ai = mList.get(position);holder.ivImage.setImageBitmap(ai.getAppIcon());holder.tvName.setText(ai.getAppName());holder.tvVer.setText(ai.getAppVer());holder.tvSize.setText(ai.getAppSize());return convertView;}}public static class ViewHolder {private ImageView ivImage;private TextView tvName;private TextView tvVer;private TextView tvSize;}}

list_item.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content" >    <ImageView        android:id="@+id/ivIcon"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:contentDescription="@string/image_desc"        android:src="@drawable/ic_launcher" />    <LinearLayout        android:id="@+id/appInfo"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="5dip"        android:layout_toRightOf="@id/ivIcon"        android:orientation="vertical" >        <TextView            android:id="@+id/tvName"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/name"            android:textColor="#000000"            android:textSize="16sp" />        <TextView            android:id="@+id/tvVer"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/ver"            android:textColor="#666666"            android:textSize="13sp" />        <TextView            android:id="@+id/tvSize"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/size"            android:textColor="#666666"            android:textSize="13sp" />    </LinearLayout>    <Button        android:id="@+id/btnClick"        android:layout_width="80dip"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:focusable="false"        android:text="@string/mgr"        android:textColor="#000000"        android:textSize="16sp" /></RelativeLayout>

工程下载地址：http://download.csdn.net/detail/fx_sky/5646017