listView上拉刷新下拉加载

xlistview_header.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/xlistview_header_content"
        android:layout_width="fill_parent"
        android:layout_height="60dp" >  

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:orientation="vertical" android:id="@+id/xlistview_header_text">  

            <TextView
                android:id="@+id/xlistview_header_hint_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/xlistview_header_hint_normal" />  

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="3dp" >  

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/xlistview_header_last_time"
                    android:textSize="12sp" />  

                <TextView
                    android:id="@+id/xlistview_header_time"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="12sp" />
            </LinearLayout>
        </LinearLayout>  

        <ImageView
            android:id="@+id/xlistview_header_arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-35dp"
            android:src="@drawable/xlistview_arrow"
            android:contentDescription="@null" />  

        <ProgressBar
            android:id="@+id/xlistview_header_progressbar"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-40dp"
            android:visibility="invisible" />
    </RelativeLayout>  

XListViewHeader.java

/**
 * @file XListViewHeader.java
 * @description XListView's header
 */
package com.example.listviewrefresh;  

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;  

public class XListViewHeader extends LinearLayout {
    private RelativeLayout mContainer = null;
    private ImageView mArrowImageView = null;
    private ProgressBar mProgressBar = null;
    private TextView mHintTextView = null;
    private int mState = STATE_NORMAL;  

    private Animation mRotateUpAnim = null;
    private Animation mRotateDownAnim = null;  

    private final int ROTATE_ANIM_DURATION = ;  

    public final static int STATE_NORMAL = ;
    public final static int STATE_READY = ;
    public final static int STATE_REFRESHING = ;  

    public XListViewHeader(Context context) {
        super(context);
        initView(context);
    }  

    /**
     * @param context
     * @param attrs
     */
    public XListViewHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }  

    /**
     * 得到控件，初始化动画变量
     * @param context
     */
    private void initView(Context context) {
        // 初始情况，设置下拉刷新view高度为0
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, );
        mContainer = (RelativeLayout) LayoutInflater.from(context).inflate(
                R.layout.xlistview_header, null);
        addView(mContainer, lp);
        setGravity(Gravity.BOTTOM);  

        mArrowImageView = (ImageView)findViewById(R.id.xlistview_header_arrow);
        mHintTextView = (TextView)findViewById(R.id.xlistview_header_hint_textview);
        mProgressBar = (ProgressBar)findViewById(R.id.xlistview_header_progressbar);
        /*** 以0.0的位置为起始点，逆时针旋转180度，围绕自身的中心点 */
        mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
                0.5f);
        mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION);
        mRotateUpAnim.setFillAfter(true);
        /*** 以逆时针180度的位置为起始点，顺时针旋转到0.0的位置，围绕自身的中心点 */
        mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f,
                Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
                0.5f);
        mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION);
        mRotateDownAnim.setFillAfter(true);
    }  

    /**
     * 根据不同的状态得到不同的处理
     * @param state
     */
    public void setState(int state) {
        if (state == mState) return ;  

        if (state == STATE_REFRESHING) {
            mArrowImageView.clearAnimation();
            mArrowImageView.setVisibility(View.INVISIBLE);
            mProgressBar.setVisibility(View.VISIBLE);
        } else {
            mArrowImageView.setVisibility(View.VISIBLE);
            mProgressBar.setVisibility(View.INVISIBLE);
        }  

        switch(state){
        case STATE_NORMAL:
            if (mState == STATE_READY) {
                mArrowImageView.startAnimation(mRotateDownAnim);
            }
            if (mState == STATE_REFRESHING) {
                mArrowImageView.clearAnimation();
            }
            mHintTextView.setText(R.string.xlistview_header_hint_normal);
            break;
        case STATE_READY:
            if (mState != STATE_READY) {
                mArrowImageView.clearAnimation();
                //开始动画，逆时针旋转180度
                mArrowImageView.startAnimation(mRotateUpAnim);
                mHintTextView.setText(R.string.xlistview_header_hint_ready);
            }
            break;
        case STATE_REFRESHING:
            mHintTextView.setText(R.string.xlistview_header_hint_loading);
            break;
            default:
        }  

        mState = state;
    }
    /**
     * 将header.xml的高度设为参数的高度
     * @param height
     */
    public void setVisiableHeight(int height) {
        if (height < )
            height = ;
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContainer
                .getLayoutParams();
        lp.height = height;
        mContainer.setLayoutParams(lp);
    }
    /**
     * 得到header.xml的高度
     * @return
     */
    public int getVisiableHeight() {
        return mContainer.getHeight();
    }  

}  

xlistview_footer.xml

[html] view plaincopy
<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/xlistview_footer_content"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp" >  

        <ProgressBar
            android:id="@+id/xlistview_footer_progressbar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:visibility="invisible" />  

        <TextView
            android:id="@+id/xlistview_footer_hint_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="@string/xlistview_footer_hint_normal" />
    </RelativeLayout>  

XListViewFooter.java

[java] view plaincopy
/**
 * @file XFooterView.java
 * @description XListView's footer
 */
package com.example.listviewrefresh;  

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;  

public class XListViewFooter extends LinearLayout {
    public final static int STATE_NORMAL = ;
    public final static int STATE_READY = ;
    public final static int STATE_LOADING = ;  

    private Context mContext;  

    private View mContentView;
    private View mProgressBar;
    private TextView mHintView;  

    public XListViewFooter(Context context) {
        super(context);
        initView(context);
    }  

    public XListViewFooter(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }  

    public void setState(int state) {
        mHintView.setVisibility(View.INVISIBLE);
        mProgressBar.setVisibility(View.INVISIBLE);
        mHintView.setVisibility(View.INVISIBLE);
        if (state == STATE_READY) {
            mHintView.setVisibility(View.VISIBLE);
            mHintView.setText(R.string.xlistview_footer_hint_ready);
        } else if (state == STATE_LOADING) {
            mProgressBar.setVisibility(View.VISIBLE);
        } else {
            mHintView.setVisibility(View.VISIBLE);
            mHintView.setText(R.string.xlistview_footer_hint_normal);
        }
    }  

    public void setBottomMargin(int height) {
        if (height < ) return ;
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
        lp.bottomMargin = height;
        mContentView.setLayoutParams(lp);
    }  

    public int getBottomMargin() {
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
        return lp.bottomMargin;
    }  

    /**
     * normal status
     */
    public void normal() {
        mHintView.setVisibility(View.VISIBLE);
        mProgressBar.setVisibility(View.GONE);
    }  

    /**
     * loading status
     */
    public void loading() {
        mHintView.setVisibility(View.GONE);
        mProgressBar.setVisibility(View.VISIBLE);
    }  

    /**
     * hide footer when disable pull load more
     */
    public void hide() {
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
        lp.height = ;
        mContentView.setLayoutParams(lp);
    }  

    /**
     * show footer
     */
    public void show() {
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
        lp.height = LayoutParams.WRAP_CONTENT;
        mContentView.setLayoutParams(lp);
    }  

    private void initView(Context context) {
        mContext = context;
        RelativeLayout moreView = (RelativeLayout)LayoutInflater.from(mContext).inflate(R.layout.xlistview_footer, null);
        addView(moreView);
        moreView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));  

        mContentView = moreView.findViewById(R.id.xlistview_footer_content);
        mProgressBar = moreView.findViewById(R.id.xlistview_footer_progressbar);
        mHintView = (TextView)moreView.findViewById(R.id.xlistview_footer_hint_textview);
    }  

}  

XListView.java

[java] view plaincopy
/**
 * @file XListView.java
 * @description An ListView support (a) Pull down to refresh, (b) Pull up to load more.
 *      Implement IXListViewListener, and see stopRefresh() / stopLoadMore().
 */
package com.example.listviewrefresh;  

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.DecelerateInterpolator;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Scroller;
import android.widget.TextView;  

public class XListView extends ListView implements OnScrollListener {  

    private float mLastY = -; // save event y
    private Scroller mScroller; // used for scroll back
    private OnScrollListener mScrollListener; // user's scroll listener  

    // the interface to trigger refresh and load more.
    private IXListViewListener mListViewListener;  

    // -- header view
    private XListViewHeader mHeaderView;
    // header view content, use it to calculate the Header's height. And hide it
    // when disable pull refresh.
    private RelativeLayout mHeaderViewContent;
    private TextView mHeaderTimeView;
    private int mHeaderViewHeight; // header view's height
    private boolean mEnablePullRefresh = true;
    private boolean mPullRefreshing = false; // is refreashing.  

    // -- footer view
    private XListViewFooter mFooterView;
    private boolean mEnablePullLoad;
    private boolean mPullLoading;
    private boolean mIsFooterReady = false;  

    // total list items, used to detect is at the bottom of listview.
    private int mTotalItemCount;  

    // for mScroller, scroll back from header or footer.
    private int mScrollBack;
    private final static int SCROLLBACK_HEADER = ;
    private final static int SCROLLBACK_FOOTER = ;  

    private final static int SCROLL_DURATION = ; // scroll back duration
//  private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px  at bottom, trigger load more.
    private final static int PULL_LOAD_MORE_DELTA = ;
    private final static float OFFSET_RADIO = 1.8f; // support iOS like pull feature.  

    /**
     * @param context
     */
    public XListView(Context context) {
        super(context);
        initWithContext(context);
    }  

    public XListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initWithContext(context);
    }  

    public XListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initWithContext(context);
    }  

    private void initWithContext(Context context) {
        mScroller = new Scroller(context, new DecelerateInterpolator());
        // XListView need the scroll event, and it will dispatch the event to
        // user's listener (as a proxy).
        super.setOnScrollListener(this);  

        // init header view
        mHeaderView = new XListViewHeader(context);
        mHeaderViewContent = (RelativeLayout) mHeaderView
                .findViewById(R.id.xlistview_header_content);
        mHeaderTimeView = (TextView) mHeaderView
                .findViewById(R.id.xlistview_header_time);
        addHeaderView(mHeaderView);  

        // init footer view
        mFooterView = new XListViewFooter(context);  

        // init header height
        mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
                new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        mHeaderViewHeight = mHeaderViewContent.getHeight();
                        getViewTreeObserver()
                                .removeGlobalOnLayoutListener(this);
                    }
                });
    }  

    @Override
    public void setAdapter(ListAdapter adapter) {
        // make sure XListViewFooter is the last footer view, and only add once.
        if (mIsFooterReady == false) {
            mIsFooterReady = true;
            addFooterView(mFooterView);
        }
        super.setAdapter(adapter);
    }  

    /**
     * enable or disable pull down refresh feature.
     * @param enable
     */
    public void setPullRefreshEnable(boolean enable) {
        mEnablePullRefresh = enable;
        if (!mEnablePullRefresh) { // disable, hide the content
            mHeaderViewContent.setVisibility(View.INVISIBLE);
        } else {
            mHeaderViewContent.setVisibility(View.VISIBLE);
        }
    }  

    /**
     * enable or disable pull up load more feature.
     * @param enable
     */
    public void setPullLoadEnable(boolean enable) {
        mEnablePullLoad = enable;
        if (!mEnablePullLoad) {
            mFooterView.hide();
            mFooterView.setOnClickListener(null);
        } else {
            mPullLoading = false;
            mFooterView.show();
            mFooterView.setState(XListViewFooter.STATE_NORMAL);
            // both "pull up" and "click" will invoke load more.
            mFooterView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    startLoadMore();
                }
            });
        }
    }  

    /**
     * stop refresh, reset header view.
     */
    public void stopRefresh() {
        if (mPullRefreshing == true) {
            mPullRefreshing = false;
            resetHeaderHeight();
        }
    }  

    /**
     * stop load more, reset footer view.
     */
    public void stopLoadMore() {
        if (mPullLoading == true) {
            mPullLoading = false;
            mFooterView.setState(XListViewFooter.STATE_NORMAL);
        }
    }  

    /**
     * set last refresh time
     * @param time
     */
    public void setRefreshTime(String time) {
        mHeaderTimeView.setText(time);
    }  

    private void invokeOnScrolling() {
        if (mScrollListener instanceof OnXScrollListener) {
            OnXScrollListener l = (OnXScrollListener) mScrollListener;
            l.onXScrolling(this);
        }
    }  

    private void updateHeaderHeight(float delta) {
        mHeaderView.setVisiableHeight((int) delta
                + mHeaderView.getVisiableHeight());
        if (mEnablePullRefresh && !mPullRefreshing) {// 未处于刷新状态，更新箭头
            if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
                mHeaderView.setState(XListViewHeader.STATE_READY);
            } else {
                mHeaderView.setState(XListViewHeader.STATE_NORMAL);
            }
        }
        setSelection(); // scroll to top each time
    }  

    /**
     * reset header view's height.
     */
    private void resetHeaderHeight() {
        int height = mHeaderView.getVisiableHeight();
        if (height == ) // not visible.
            return;
        // refreshing and header isn't shown fully. do nothing.
        if (mPullRefreshing && height <= mHeaderViewHeight) {
            return;
        }
        int finalHeight = ; // default: scroll back to dismiss header.
        // is refreshing, just scroll back to show all the header.
        if (mPullRefreshing && height > mHeaderViewHeight) {
            finalHeight = mHeaderViewHeight;
        }
        mScrollBack = SCROLLBACK_HEADER;
        mScroller.startScroll(, height, , finalHeight - height,
                SCROLL_DURATION);
        // trigger computeScroll
        invalidate();
    }  

    private void updateFooterHeight(float delta) {
        int height = mFooterView.getBottomMargin() + (int) delta;
        if (mEnablePullLoad && !mPullLoading) {
            if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
                                                    // more.
                mFooterView.setState(XListViewFooter.STATE_READY);
            } else {
                mFooterView.setState(XListViewFooter.STATE_NORMAL);
            }
        }
        mFooterView.setBottomMargin(height);  

//      setSelection(mTotalItemCount - 1); // scroll to bottom
    }  

    private void resetFooterHeight() {
        int bottomMargin = mFooterView.getBottomMargin();
        if (bottomMargin > ) {
            mScrollBack = SCROLLBACK_FOOTER;
            mScroller.startScroll(, bottomMargin, , -bottomMargin,
                    SCROLL_DURATION);
            invalidate();
        }
    }  

    private void startLoadMore() {
        mPullLoading = true;
        mFooterView.setState(XListViewFooter.STATE_LOADING);
        if (mListViewListener != null) {
            mListViewListener.onLoadMore();
        }
    }  

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (mLastY == -) {
            mLastY = ev.getRawY();
        }  

        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            mLastY = ev.getRawY();
            break;
        case MotionEvent.ACTION_MOVE:
            final float deltaY = ev.getRawY() - mLastY;
            mLastY = ev.getRawY();
            if (getFirstVisiblePosition() ==
                    && (mHeaderView.getVisiableHeight() >  || deltaY > )) {
                // the first item is showing, header has shown or pull down.
                updateHeaderHeight(deltaY / OFFSET_RADIO);
                invokeOnScrolling();
            } else if (getLastVisiblePosition() == mTotalItemCount -
                    && (mFooterView.getBottomMargin() >  || deltaY < )) {
                // last item, already pulled up or want to pull up.
                updateFooterHeight(-deltaY / OFFSET_RADIO);
            }
            break;
        default:
            mLastY = -; // reset
            if (getFirstVisiblePosition() == ) {
                // invoke refresh
                if (mEnablePullRefresh
                        && mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
                    mPullRefreshing = true;
                    mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
                    if (mListViewListener != null) {
                        mListViewListener.onRefresh();
                    }
                }
                resetHeaderHeight();
            } else if (getLastVisiblePosition() == mTotalItemCount - ) {
                // invoke load more.
                if (mEnablePullLoad
                        && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
                    startLoadMore();
                }
                resetFooterHeight();
            }
            break;
        }
        return super.onTouchEvent(ev);
    }  

    @Override
    public void computeScroll() {
        if (mScroller.computeScrollOffset()) {
            if (mScrollBack == SCROLLBACK_HEADER) {
                mHeaderView.setVisiableHeight(mScroller.getCurrY());
            } else {
                mFooterView.setBottomMargin(mScroller.getCurrY());
            }
            postInvalidate();
            invokeOnScrolling();
        }
        super.computeScroll();
    }  

    @Override
    public void setOnScrollListener(OnScrollListener l) {
        mScrollListener = l;
    }  

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if (mScrollListener != null) {
            mScrollListener.onScrollStateChanged(view, scrollState);
        }
    }  

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // send to user's listener
        mTotalItemCount = totalItemCount;
        if (mScrollListener != null) {
            mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
                    totalItemCount);
        }
    }  

    public void setXListViewListener(IXListViewListener l) {
        mListViewListener = l;
    }  

    /**
     * you can listen ListView.OnScrollListener or this one. it will invoke
     * onXScrolling when header/footer scroll back.
     */
    public interface OnXScrollListener extends OnScrollListener {
        public void onXScrolling(View view);
    }  

    /**
     * implements this interface to get refresh/load more event.
     */
    public interface IXListViewListener {
        public void onRefresh();
        public void onLoadMore();
    }
}  

XListViewActivity.java

[java] view plaincopy
package com.example.listviewrefresh;  

import java.util.ArrayList;  

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ArrayAdapter;  

import com.example.listviewrefresh.XListView.IXListViewListener;  

public class XListViewActivity extends Activity implements IXListViewListener {
    private XListView mListView;
    private ArrayAdapter<String> mAdapter;
    private ArrayList<String> items = new ArrayList<String>();
    private Handler mHandler;
    private int start = ;
    private static int refreshCnt = ;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        geneItems();
        mListView = (XListView) findViewById(R.id.xListView);
        mListView.setPullLoadEnable(true);
        mAdapter = new ArrayAdapter<String>(this, R.layout.list_item, items);
        mListView.setAdapter(mAdapter);
//      mListView.setPullLoadEnable(false);
//      mListView.setPullRefreshEnable(false);
        mListView.setXListViewListener(this);
        mHandler = new Handler();
    }  

    private void geneItems() {
        for (int i = ; i != ; ++i) {
            items.add("refresh cnt " + (++start));
        }
    }  

    private void onLoad() {
        mListView.stopRefresh();
        mListView.stopLoadMore();
        mListView.setRefreshTime("");
    }  

    @Override
    public void onRefresh() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                start = ++refreshCnt;
                items.clear();
                geneItems();
                // mAdapter.notifyDataSetChanged();
                mAdapter = new ArrayAdapter<String>(XListViewActivity.this, R.layout.list_item, items);
                mListView.setAdapter(mAdapter);
                onLoad();
            }
        }, );
    }  

    @Override
    public void onLoadMore() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                geneItems();
                mAdapter.notifyDataSetChanged();
                onLoad();
            }
        }, );
    }  

}