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", "" + 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() {

            @Override
            public 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;
            }
        };
    };

    @Override
    protected 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() {

            @Override
            public void onRefresh() {
                //TODO 下拉刷新
                Log.e(TAG, "onRefresh");
                loadData(0);
            }
        });

        mListView.setonLoadListener(new OnLoadListener() {

            @Override
            public void onLoad() {
                //TODO 加载更多
                Log.e(TAG, "onLoad");
                loadData(1);
            }
        });

        mListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                Log.e(TAG, "click position:" + position);

            }

        });
    }

    public void loadData(final int type){
        new Thread(){
            @Override
            public 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);
        }
    }

    @Override
    public 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);
        }

        @Override
        public int getCount() {
            return mList.size();
        }

        @Override
        public Object getItem(int arg0) {
            return mList.get(arg0);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public 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>