listview 最简单也最困难2

向上拉刷新，向下加载更多

package com.weidingqiang.customlistview;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
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.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;


/**
 * 下拉刷新，底部更多
 *
 */
public class RefreshListView extends ListView implements OnScrollListener{

    private static final String TAG = RefreshListView.class.getSimpleName();

    private float mDownY;
    private float mMoveY;

    private int mHeaderHeight;

    private int mCurrentScrollState;

    private final static int NONE_PULL_REFRESH = 0;    //正常状态
    private final static int ENTER_PULL_REFRESH = 1;   //进入下拉刷新状态
    private final static int OVER_PULL_REFRESH = 2;    //进入松手刷新状态
    private final static int EXIT_PULL_REFRESH = 3;    //松手后反弹和加载状态
    private int mPullRefreshState = 0;                 //记录刷新状态

    private final static int REFRESH_BACKING = 0;      //反弹中
    private final static int REFRESH_BACED = 1;        //达到刷新界限，反弹结束后
    private final static int REFRESH_RETURN = 2;       //没有达到刷新界限，返回
    private final static int REFRESH_DONE = 3;         //加载数据结束

    private LinearLayout mHeaderLinearLayout = null;
    private LinearLayout mFooterLinearLayout = null;
    private TextView mHeaderTextView = null;
    private TextView mHeaderUpdateText = null;
    private ImageView mHeaderPullDownImageView = null;
    private ImageView mHeaderReleaseDownImageView = null;
    private ProgressBar mHeaderProgressBar = null;
    private TextView mFooterTextView = null;
    private ProgressBar mFooterProgressBar = null;

    private SimpleDateFormat mSimpleDateFormat;

    private Object mRefreshObject = null;
    private RefreshListener mRefreshListener = null;
    public void setOnRefreshListener(RefreshListener refreshListener) {
        this.mRefreshListener = refreshListener;
    }

    public RefreshListView(Context context) {
        this(context, null);
    }

    public RefreshListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    void init(final Context context) {
        mHeaderLinearLayout = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.refresh_list_header, null);
        addHeaderView(mHeaderLinearLayout);
        mHeaderTextView = (TextView) findViewById(R.id.refresh_list_header_text);
        mHeaderUpdateText = (TextView) findViewById(R.id.refresh_list_header_last_update);
        mHeaderPullDownImageView = (ImageView) findViewById(R.id.refresh_list_header_pull_down);
        mHeaderReleaseDownImageView = (ImageView) findViewById(R.id.refresh_list_header_release_up);
        mHeaderProgressBar = (ProgressBar) findViewById(R.id.refresh_list_header_progressbar);

        mFooterLinearLayout = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.refresh_list_footer, null);
        addFooterView(mFooterLinearLayout);
        mFooterProgressBar = (ProgressBar) findViewById(R.id.refresh_list_footer_progressbar);
        mFooterTextView = (TextView) mFooterLinearLayout.findViewById(R.id.refresh_list_footer_text);
        mFooterLinearLayout.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (context.getString(R.string.app_list_footer_more).equals(mFooterTextView.getText())) {
                    mFooterTextView.setText(R.string.app_list_footer_loading);
                    mFooterProgressBar.setVisibility(View.VISIBLE);
                    if (mRefreshListener != null) {
                        //mRefreshListener.more();
                    }
                }
            }
        });

        setSelection(1);
        setOnScrollListener(this);
        measureView(mHeaderLinearLayout);
        mHeaderHeight = mHeaderLinearLayout.getMeasuredHeight();

        mSimpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");
        mHeaderUpdateText.setText(context.getString(R.string.app_list_header_refresh_last_update, mSimpleDateFormat.format(new Date())));
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {

        Log.d(TAG, ">>>>>>>onTouchEvent>>>>>");

        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mDownY = ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                mMoveY = ev.getY();
                if (mPullRefreshState == OVER_PULL_REFRESH) {
                    mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
                            (int)((mMoveY - mDownY)/3),
                            mHeaderLinearLayout.getPaddingRight(),
                            mHeaderLinearLayout.getPaddingBottom());
                }
                break;
            case MotionEvent.ACTION_UP:
                //when you action up, it will do these:
                //1. roll back util header topPadding is 0
                //2. hide the header by setSelection(1)
                if (mPullRefreshState == OVER_PULL_REFRESH || mPullRefreshState == ENTER_PULL_REFRESH) {
                    new Thread() {
                        public void run() {
                            Message msg;
                            while(mHeaderLinearLayout.getPaddingTop() > 1) {
                                msg = mHandler.obtainMessage();
                                msg.what = REFRESH_BACKING;
                                mHandler.sendMessage(msg);
                                try {
                                    sleep(5);
                                } catch (InterruptedException e) {
                                    e.printStackTrace();
                                }
                            }
                            msg = mHandler.obtainMessage();
                            if (mPullRefreshState == OVER_PULL_REFRESH) {
                                msg.what = REFRESH_BACED;
                            } else {
                                msg.what = REFRESH_RETURN;
                            }
                            mHandler.sendMessage(msg);
                        };
                    }.start();
                }
                break;
        }
        return super.onTouchEvent(ev);
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

        Log.d(TAG,">>>>>>>firstVisibleItem     "+firstVisibleItem +"  visibleItemCount    "+visibleItemCount +
        "  totalItemCount   "+totalItemCount);

        if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL
                && firstVisibleItem == 0
                && (mHeaderLinearLayout.getBottom() >= 0 && mHeaderLinearLayout.getBottom() < mHeaderHeight)) {
            //进入且仅进入下拉刷新状态
            if (mPullRefreshState == NONE_PULL_REFRESH) {
                mPullRefreshState = ENTER_PULL_REFRESH;
            }
        } else if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL
                && firstVisibleItem == 0
                && (mHeaderLinearLayout.getBottom() >= mHeaderHeight)) {
            //下拉达到界限，进入松手刷新状态
            if (mPullRefreshState == ENTER_PULL_REFRESH || mPullRefreshState == NONE_PULL_REFRESH) {
                mPullRefreshState = OVER_PULL_REFRESH;
                mDownY = mMoveY; //为下拉1/3折扣效果记录开始位置
                mHeaderTextView.setText("松手刷新");//显示松手刷新
                mHeaderPullDownImageView.setVisibility(View.GONE);//隐藏"下拉刷新"
                mHeaderReleaseDownImageView.setVisibility(View.VISIBLE);//显示向上的箭头
            }
        } else if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL && firstVisibleItem != 0) {
            //不刷新了
            if (mPullRefreshState == ENTER_PULL_REFRESH) {
                mPullRefreshState = NONE_PULL_REFRESH;
            }
        } else if (mCurrentScrollState == SCROLL_STATE_FLING && firstVisibleItem == 0) {
            //飞滑状态，不能显示出header，也不能影响正常的飞滑
            //只在正常情况下才纠正位置
            if (mPullRefreshState == NONE_PULL_REFRESH) {
                setSelection(1);
            }
        }

        //判断是否滚到最后一行
        if (firstVisibleItem + visibleItemCount == totalItemCount && totalItemCount > 0) {
            isLastRow = true;
        }

        //当数据少的时候 隐藏header 和 footer
        if(totalItemCount!=0 && visibleItemCount == totalItemCount)
        {
            removeFootView();
            removeHeaderView(mHeaderLinearLayout);
        }
    }

    private boolean isLastRow =false;

    //scrollState = SCROLL_STATE_TOUCH_SCROLL(1) 正在滚动
    //scrollState = SCROLL_STATE_FLING(2) 手指做了抛的动作（手指离开屏幕前，用力滑了一下）
    //scrollState = SCROLL_STATE_IDLE(0) 停止滚动
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        mCurrentScrollState = scrollState;

        //当滚到最后一行且停止滚动时，执行加载
        if (isLastRow && scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
            Log.d(TAG,"zuihoula");
            if(mRefreshListener != null){
                mRefreshListener.loadEnding();
            }
            isLastRow = false;
        }
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        super.setAdapter(adapter);
        setSelection(1);
    }

    private void measureView(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        if (p == null) {
            p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_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);
    }

    private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case REFRESH_BACKING:
                    mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
                            (int) (mHeaderLinearLayout.getPaddingTop()*0.75f),
                            mHeaderLinearLayout.getPaddingRight(),
                            mHeaderLinearLayout.getPaddingBottom());
                    break;
                case REFRESH_BACED:
                    mHeaderTextView.setText("正在加载...");
                    mHeaderProgressBar.setVisibility(View.VISIBLE);
                    mHeaderPullDownImageView.setVisibility(View.GONE);
                    mHeaderReleaseDownImageView.setVisibility(View.GONE);
                    mPullRefreshState = EXIT_PULL_REFRESH;
                    if(mRefreshListener != null){
                        mRefreshListener.loading();
                    }

//                    new Thread() {
//                        public void run() {
//                            if (mRefreshListener != null) {
//                                mRefreshObject = mRefreshListener.refreshing();
//                            }
//                            Message msg = mHandler.obtainMessage();
//                            msg.what = REFRESH_DONE;
//                            mHandler.sendMessage(msg);
//                        };
//                    }.start();
                    break;
                case REFRESH_RETURN:
                    mHeaderTextView.setText("下拉刷新");
                    mHeaderProgressBar.setVisibility(View.INVISIBLE);
                    mHeaderPullDownImageView.setVisibility(View.VISIBLE);
                    mHeaderReleaseDownImageView.setVisibility(View.GONE);
                    mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
                            0,
                            mHeaderLinearLayout.getPaddingRight(),
                            mHeaderLinearLayout.getPaddingBottom());
                    mPullRefreshState = NONE_PULL_REFRESH;
                    setSelection(1);
                    break;
                case REFRESH_DONE:
                    mHeaderTextView.setText("下拉刷新");
                    mHeaderProgressBar.setVisibility(View.INVISIBLE);
                    mHeaderPullDownImageView.setVisibility(View.VISIBLE);
                    mHeaderReleaseDownImageView.setVisibility(View.GONE);
                    mHeaderUpdateText.setText(getContext().getString(R.string.app_list_header_refresh_last_update,
                            mSimpleDateFormat.format(new Date())));
                    mHeaderLinearLayout.setPadding(mHeaderLinearLayout.getPaddingLeft(),
                            0,
                            mHeaderLinearLayout.getPaddingRight(),
                            mHeaderLinearLayout.getPaddingBottom());
                    mPullRefreshState = NONE_PULL_REFRESH;
                    setSelection(1);
                    if (mRefreshListener != null) {
                        mRefreshListener.refreshed(mRefreshObject);
                    }
                    break;
                default:
                    break;
            }
        }
    };
    public interface RefreshListener {
        void refreshed(Object obj);
        void loadEnding();
        void loading();
    }

    public void finishFootView() {
        mFooterProgressBar.setVisibility(View.GONE);
        mFooterTextView.setText(R.string.app_list_footer_more);
    }

    public void addFootView() {
        if (getFooterViewsCount() == 0) {
            addFooterView(mFooterLinearLayout);
        }
    }

    public void removeFootView() {
        removeFooterView(mFooterLinearLayout);
    }

    public void onLoadComplete(){
        Message msg = mHandler.obtainMessage();
        msg.what = REFRESH_DONE;
        mHandler.sendMessage(msg);
    }
}

package com.weidingqiang.customlistview;

import android.os.AsyncTask;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements RefreshListView.RefreshListener{

    private RefreshListView listView;

    List<String> data;

    private ArrayAdapter arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initViewUI();
        initData();
        initEvent();
    }

    private void initViewUI(){
        listView = (RefreshListView) this.findViewById(R.id.listview);
    }

    private void initData(){
        data = new ArrayList<String>();

        data.add("测试数据1");
        data.add("测试数据2");
        data.add("测试数据3");
        data.add("测试数据1");
        data.add("测试数据2");
        data.add("测试数据3");
        data.add("测试数据1");
        data.add("测试数据2");
        data.add("测试数据3");
        data.add("测试数据1");
        data.add("测试数据2");
        data.add("测试数据3");

        arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,data);

        listView.setAdapter(arrayAdapter);
        listView.setOnRefreshListener(this);
    }

    private void initEvent(){

    }


    @Override
    public void refreshed(Object obj) {

    }

    @Override
    public void loadEnding() {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                for (int i=0;i<10;i++)
                {
                    data.add("end刷新后添加的内容"+i);
                }
                arrayAdapter.notifyDataSetChanged();
                //listView.onLoadComplete();
            }
        },1000);
    }

    @Override
    public void loading() {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {

                data.add(0, "start刷新后添加的内容");
                data.add(0, "start刷新后添加的内容");
                arrayAdapter.notifyDataSetChanged();
                listView.onLoadComplete();
            }
        },1000);
    }
}

　　

<?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="match_parent"
    >

    <com.weidingqiang.customlistview.RefreshListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

    </com.weidingqiang.customlistview.RefreshListView>
</RelativeLayout>

footer

<?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">
    <TextView android:id="@+id/refresh_list_footer_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="20dip"
        android:textColor="#192F06"
        android:padding="12dip"
        android:text="@string/app_list_footer_loading"/>
    <ProgressBar android:id="@+id/refresh_list_footer_progressbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        style="?android:attr/progressBarStyleSmall"
        android:visibility="gone">
    </ProgressBar>
</LinearLayout>

　　header

<?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="wrap_content"
    android:gravity="center">
    <ProgressBar android:id="@+id/refresh_list_header_progressbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        style="?android:attr/progressBarStyleSmall"
        android:visibility="gone">
    </ProgressBar>
    <ImageView android:id="@+id/refresh_list_header_pull_down"
        android:layout_width="9dip"
        android:layout_height="25dip"
        android:layout_gravity="center"
        android:src="@mipmap/arrow_down" />
    <ImageView android:id="@+id/refresh_list_header_release_up"
        android:layout_width="9dip"
        android:layout_height="25dip"
        android:layout_gravity="center"
        android:src="@mipmap/arrow_up"
        android:visibility="gone" />
    <RelativeLayout android:layout_width="180dip"
        android:layout_height="wrap_content">
        <TextView android:id="@+id/refresh_list_header_text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_alignParentTop="true"
            android:textSize="12dip"
            android:textColor="#192F06"
            android:paddingTop="8dip"
            android:text="@string/app_list_header_refresh_down"/>
        <TextView android:id="@+id/refresh_list_header_last_update"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:layout_below="@id/refresh_list_header_text"
            android:textSize="12dip"
            android:textColor="#192F06"
            android:paddingBottom="8dip"
            android:text="@string/app_list_header_refresh_last_update"/>
    </RelativeLayout>
</LinearLayout>

string

<resources>
    <string name="app_name">CustomListView</string>

    <string name="app_list_header_refresh_down">下拉刷新</string>
    <string name="app_list_header_refreshing">正在刷新</string>
    <string name="app_list_header_refresh_up">松开刷新</string>
    <string name="app_list_header_refresh_last_update">上次更新于:%s</string>
    <string name="app_list_footer_more">更多</string>
    <string name="app_list_footer_loading">正在加载</string>
</resources>