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android 项目学习随笔十一（ListView下拉刷新提示）
阅读量：7082 次
发布时间：2019-06-28

本文共 17071 字，大约阅读时间需要 56 分钟。

1、 设置mHeaderView.setPadding TOPPADING为负值，隐藏刷新提示头布局

在onTouchEvent事件中进行头布局显示隐藏切换

import java.text.SimpleDateFormat;import java.util.Date;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.ImageView;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;import com.itheima.zhsh66.R;/** * 下拉刷新的listview *  */public class RefreshListView extends ListView {    private static final int STATE_PULL_TO_REFRESH = 1;// 下拉刷新    private static final int STATE_RELEASE_TO_REFRESH = 2;// 松开刷新    private static final int STATE_REFRESHING = 3;// 正在刷新    // 下拉刷新头布局    private View mHeaderView;    // 头布局高度    private int mHeaderViewHeight;    private int startY = -1;    // 当前下拉刷新的状态    private int mCurrentState = STATE_PULL_TO_REFRESH;// 默认是下拉刷新    private TextView tvTitle;    private ImageView ivArrow;    private ProgressBar pbLoading;    private TextView tvTime;    private RotateAnimation animUp;// 箭头向上动画    private RotateAnimation animDown;// 箭头向下动画    public RefreshListView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initView();    }    public RefreshListView(Context context, AttributeSet attrs) {        super(context, attrs);        initView();    }    public RefreshListView(Context context) {        super(context);        initView();    }    private void initView() {        mHeaderView = View.inflate(getContext(), R.layout.list_refresh_header,                null);        this.addHeaderView(mHeaderView);// 添加头布局        // 隐藏头布局(1, 获取头布局高度, 2.设置负paddingTop,布局就会往上走)        // int height = mHeaderView.getHeight();//此处无法获取高度,因为布局还没有绘制完成        // 绘制之前就要获取布局高度        mHeaderView.measure(0, 0);// 手动测量布局        mHeaderViewHeight = mHeaderView.getMeasuredHeight();// 测量之后的高度        // 隐藏头布局        mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);        tvTitle = (TextView) mHeaderView.findViewById(R.id.tv_title);        ivArrow = (ImageView) mHeaderView.findViewById(R.id.iv_arrow);        pbLoading = (ProgressBar) mHeaderView.findViewById(R.id.pb_loading);        tvTime = (TextView) mHeaderView.findViewById(R.id.tv_time);        initAnim();        setCurrentTime();// 设置初始时间    }    @Override    public boolean onTouchEvent(MotionEvent ev) {        switch (ev.getAction()) {        case MotionEvent.ACTION_DOWN:            startY = (int) ev.getY();            break;        case MotionEvent.ACTION_MOVE:            if (startY == -1) {
    // 如果用户按住头条新闻向下滑动, 会导致listview无法拿到ACTION_DOWN,                                //因为此时事件会被交给父控件处理                                // 此时要重新获取startY                startY = (int) ev.getY();            }            // 如果当前正在刷新, 什么都不做了            if (mCurrentState == STATE_REFRESHING) {                break;            }            int endY = (int) ev.getY();            int dy = endY - startY;            if (dy > 0 && getFirstVisiblePosition() == 0) {
    // 向下滑动&当前显示的是第一个item,才允许下拉刷新                int paddingTop = dy - mHeaderViewHeight;// 计算当前的paddingtop值                // 根据padding切换状态                if (paddingTop >= 0                        && mCurrentState != STATE_RELEASE_TO_REFRESH) {                    // 切换到松开刷新                    mCurrentState = STATE_RELEASE_TO_REFRESH;                    refreshState();                } else if (paddingTop < 0                        && mCurrentState != STATE_PULL_TO_REFRESH) {                    // 切换到下拉刷新                    mCurrentState = STATE_PULL_TO_REFRESH;                    refreshState();                }                mHeaderView.setPadding(0, paddingTop, 0, 0);// 重新设置头布局padding                return true;            }            break;        case MotionEvent.ACTION_UP:            startY = -1;// 起始坐标归零            if (mCurrentState == STATE_RELEASE_TO_REFRESH) {                // 如果当前是松开刷新, 就要切换为正在刷新                mCurrentState = STATE_REFRESHING;                // 显示头布局                mHeaderView.setPadding(0, 0, 0, 0);                refreshState();                // 下拉刷新回调                if (mListener != null) {                    mListener.onRefresh();                }            } else if (mCurrentState == STATE_PULL_TO_REFRESH) {                // 隐藏头布局                mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);            }            break;        default:            break;        }        return super.onTouchEvent(ev);    }    /**     * 初始化箭头动画     */    private void initAnim() {        animUp = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f,                Animation.RELATIVE_TO_SELF, 0.5f);        animUp.setDuration(500);        animUp.setFillAfter(true);// 保持状态        animDown = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF,                0.5f, Animation.RELATIVE_TO_SELF, 0.5f);        animDown.setDuration(500);        animDown.setFillAfter(true);// 保持状态    }    /**     * 根据当前状态刷新界面     */    private void refreshState() {        switch (mCurrentState) {        case STATE_PULL_TO_REFRESH:            tvTitle.setText("下拉刷新");            // 箭头向下移动            ivArrow.startAnimation(animDown);            // 隐藏进度条            pbLoading.setVisibility(View.INVISIBLE);            ivArrow.setVisibility(View.VISIBLE);            break;        case STATE_RELEASE_TO_REFRESH:            tvTitle.setText("松开刷新");            // 箭头向上移动            ivArrow.startAnimation(animUp);            // 隐藏进度条            pbLoading.setVisibility(View.INVISIBLE);            ivArrow.setVisibility(View.VISIBLE);            break;        case STATE_REFRESHING:            tvTitle.setText("正在刷新...");            pbLoading.setVisibility(View.VISIBLE);            ivArrow.clearAnimation();// 必须清除动画,才能隐藏控件            ivArrow.setVisibility(View.INVISIBLE);            break;        default:            break;        }    }    private OnRefreshListener mListener;    public void setOnRefreshListener(OnRefreshListener listener) {        mListener = listener;    }    /**     * 设置上次刷新时间     */    private void setCurrentTime() {        // 08:10 8:10 1        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// HH表示24小时制        String time = format.format(new Date());        tvTime.setText(time);    }    // 刷新完成    public void onRefreshComplete(boolean success) {        // 隐藏头布局        mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);        mCurrentState = STATE_PULL_TO_REFRESH;        // 隐藏进度条        pbLoading.setVisibility(View.INVISIBLE);        ivArrow.setVisibility(View.VISIBLE);        tvTitle.setText("下拉刷新");        // 刷新失败,不需要更新时间        if (success) {            setCurrentTime();        }    }    public interface OnRefreshListener {        // 下拉刷新的回调        public void onRefresh();    }}
RefreshListView

 2、给箭头图片设置动画

public class RefreshListView extends ListView {

private static final int STATE_PULL_TO_REFRESH = 1;// 下拉刷新

private static final int STATE_RELEASE_TO_REFRESH = 2;// 松开刷新
private static final int STATE_REFRESHING = 3;// 正在刷新

// 下拉刷新头布局

private View mHeaderView;
// 头布局高度
private int mHeaderViewHeight;

private int startY = -1;

// 当前下拉刷新的状态
private int mCurrentState = STATE_PULL_TO_REFRESH;// 默认是下拉刷新

private TextView tvTitle;

private ImageView ivArrow;
private ProgressBar pbLoading;
private TextView tvTime;

private RotateAnimation animUp;// 箭头向上动画

private RotateAnimation animDown;// 箭头向下动画

public RefreshListView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);
initView();
}

public RefreshListView(Context context, AttributeSet attrs) {

super(context, attrs);
initView();
}

public RefreshListView(Context context) {

super(context);
initView();
}

private void initView() {

mHeaderView = View.inflate(getContext(), R.layout.list_refresh_header,
null);
this.addHeaderView(mHeaderView);// 添加头布局

// 隐藏头布局(1, 获取头布局高度, 2.设置负paddingTop,布局就会往上走)

// int height = mHeaderView.getHeight();//此处无法获取高度,因为布局还没有绘制完成
// 绘制之前就要获取布局高度
mHeaderView.measure(0, 0);// 手动测量布局
mHeaderViewHeight = mHeaderView.getMeasuredHeight();// 测量之后的高度
// 隐藏头布局
mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);

tvTitle = (TextView) mHeaderView.findViewById(R.id.tv_title);

ivArrow = (ImageView) mHeaderView.findViewById(R.id.iv_arrow);
pbLoading = (ProgressBar) mHeaderView.findViewById(R.id.pb_loading);
tvTime = (TextView) mHeaderView.findViewById(R.id.tv_time);

initAnim();

setCurrentTime();// 设置初始时间
}

@Override

public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
startY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
if (startY == -1) {// 如果用户按住头条新闻向下滑动, 会导致listview无法拿到ACTION_DOWN,
//因为此时事件会被交给父控件处理
// 此时要重新获取startY
startY = (int) ev.getY();
}

// 如果当前正在刷新, 什么都不做了

if (mCurrentState == STATE_REFRESHING) {
break;
}

int endY = (int) ev.getY();

int dy = endY - startY;

if (dy > 0 && getFirstVisiblePosition() == 0) {// 向下滑动&当前显示的是第一个item,才允许下拉刷新

int paddingTop = dy - mHeaderViewHeight;// 计算当前的paddingtop值

// 根据padding切换状态

if (paddingTop >= 0
&& mCurrentState != STATE_RELEASE_TO_REFRESH) {
// 切换到松开刷新
mCurrentState = STATE_RELEASE_TO_REFRESH;
refreshState();
} else if (paddingTop < 0
&& mCurrentState != STATE_PULL_TO_REFRESH) {
// 切换到下拉刷新
mCurrentState = STATE_PULL_TO_REFRESH;
refreshState();
}

mHeaderView.setPadding(0, paddingTop, 0, 0);// 重新设置头布局padding

return true;
}

break;

case MotionEvent.ACTION_UP:
startY = -1;// 起始坐标归零

if (mCurrentState == STATE_RELEASE_TO_REFRESH) {

// 如果当前是松开刷新, 就要切换为正在刷新
mCurrentState = STATE_REFRESHING;
// 显示头布局
mHeaderView.setPadding(0, 0, 0, 0);

refreshState();

// 下拉刷新回调

if (mListener != null) {
mListener.onRefresh();
}

} else if (mCurrentState == STATE_PULL_TO_REFRESH) {

// 隐藏头布局
mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);
}

break;

default:

break;
}

return super.onTouchEvent(ev);

}

/**

* 初始化箭头动画
*/
private void initAnim() {
animUp = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
animUp.setDuration(500);
animUp.setFillAfter(true);// 保持状态

animDown = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF,

0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
animDown.setDuration(500);
animDown.setFillAfter(true);// 保持状态
}

/**

* 根据当前状态刷新界面
*/
private void refreshState() {
switch (mCurrentState) {
case STATE_PULL_TO_REFRESH:
tvTitle.setText("下拉刷新");
// 箭头向下移动
ivArrow.startAnimation(animDown);
// 隐藏进度条
pbLoading.setVisibility(View.INVISIBLE);
ivArrow.setVisibility(View.VISIBLE);
break;
case STATE_RELEASE_TO_REFRESH:
tvTitle.setText("松开刷新");
// 箭头向上移动
ivArrow.startAnimation(animUp);
// 隐藏进度条
pbLoading.setVisibility(View.INVISIBLE);
ivArrow.setVisibility(View.VISIBLE);
break;
case STATE_REFRESHING:
tvTitle.setText("正在刷新...");
pbLoading.setVisibility(View.VISIBLE);
ivArrow.clearAnimation();// 必须清除动画,才能隐藏控件
ivArrow.setVisibility(View.INVISIBLE);
break;

default:

break;
}
}

//ListView调用此方法，回调接口中的方法进行刷新数据

private OnRefreshListener mListener;

public void setOnRefreshListener(OnRefreshListener listener) {

mListener = listener;
}

/**

* 设置上次刷新时间
*/
private void setCurrentTime() {
// 08:10 8:10 1
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// HH表示24小时制
String time = format.format(new Date());
tvTime.setText(time);
}

// 刷新完成时调用此方法

public void onRefreshComplete(boolean success) {
// 隐藏头布局
mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);
mCurrentState = STATE_PULL_TO_REFRESH;
// 隐藏进度条
pbLoading.setVisibility(View.INVISIBLE);
ivArrow.setVisibility(View.VISIBLE);
tvTitle.setText("下拉刷新");

// 刷新失败,不需要更新时间

if (success) {
setCurrentTime();
}
}

public interface OnRefreshListener {

// 下拉刷新的回调
public void onRefresh();
}
}

 

---------------------------------------------------------------------------------------------------------------------------------------

public class TabDetailPager extends BaseMenuDetailPager {

// 页签分类的网络信息

private NewsTabData mTabData;
// 网络返回的新闻列表数据
private NewsData mNewsTabData;
// 加载新闻列表的url
private String mUrl;

// 头条新闻的网络数据

private ArrayList<TopNews> mTopNewsList;
// 头条新闻的数据适配器
private TopNewsAdapter mTopNewsAdapter;
// 新闻列表的集合
private ArrayList<News> mNewsList;
private NewsAdapter mNewsAdapter;

@ViewInject(R.id.vp_tab_detail)

private HorizontalScrollViewPager mViewPager;

@ViewInject(R.id.lv_tab_detail)

private RefreshListView lvList;

@ViewInject(R.id.indicator)

private CirclePageIndicator mIndicator;

@ViewInject(R.id.tv_title)

private TextView tvTopNewsTitle;

public TabDetailPager(Activity activity, NewsTabData tabData) {

super(activity);
mTabData = tabData;
mUrl = Constants.SERVER_URL + mTabData.url;
}

@Override

public View initView() {
View view = View.inflate(mActivity, R.layout.pager_tab_detail, null);
ViewUtils.inject(this, view);

View header = View.inflate(mActivity, R.layout.list_header_topnews,

null);
ViewUtils.inject(this, header);// 必须也将头布局注入到ViewUtils

// 给listview添加头布局

lvList.addHeaderView(header);

// 设置下拉刷新监听

lvList.setOnRefreshListener(new OnRefreshListener() {

@Override

public void onRefresh() {
// 从网络加载数据
getDataFromServer();
}
});

return view;

}

@Override

public void initData() {
String cache = CacheUtils.getCache(mUrl, mActivity);
if (!TextUtils.isEmpty(cache)) {
processResult(cache);
}

getDataFromServer();

}

private void getDataFromServer() {

HttpUtils utils = new HttpUtils();
utils.send(HttpMethod.GET, mUrl, new RequestCallBack<String>() {

@Override

public void onSuccess(ResponseInfo<String> responseInfo) {
String result = responseInfo.result;
processResult(result);

System.out.println("访问网络成功!!!");

CacheUtils.setCache(mUrl, result, mActivity);

// 收起下拉刷新控件

lvList.onRefreshComplete(true);
}

@Override

public void onFailure(HttpException error, String msg) {
// 收起下拉刷新控件
lvList.onRefreshComplete(false);

error.printStackTrace();

Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT).show();
}
});
}

protected void processResult(String result) {

Gson gson = new Gson();
mNewsTabData = gson.fromJson(result, NewsData.class);

// 初始化头条新闻

mTopNewsList = mNewsTabData.data.topnews;
if (mTopNewsList != null) {
mTopNewsAdapter = new TopNewsAdapter();
mViewPager.setAdapter(mTopNewsAdapter);
mIndicator.setViewPager(mViewPager);// 将指示器和viewpager绑定
mIndicator.setSnap(true);// 快照模式
mIndicator.setOnPageChangeListener(new OnPageChangeListener() {

@Override

public void onPageSelected(int position) {
System.out.println("position:" + position);
TopNews topNews = mTopNewsList.get(position);
tvTopNewsTitle.setText(topNews.title);
}

@Override

public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}

@Override

public void onPageScrollStateChanged(int state) {
}
});

mIndicator.onPageSelected(0);// 将小圆点位置归零, 解决它会在页面销毁时仍记录上次位置的bug

tvTopNewsTitle.setText(mTopNewsList.get(0).title);// 初始化第一页标题
}

// 初始化新闻列表

mNewsList = mNewsTabData.data.news;
if (mNewsList != null) {
mNewsAdapter = new NewsAdapter();
lvList.setAdapter(mNewsAdapter);
}
}

class TopNewsAdapter extends PagerAdapter {

BitmapUtils mBitmapUtils;

public TopNewsAdapter() {

// 初始化xutils中的加载图片的工具
mBitmapUtils = new BitmapUtils(mActivity);
// 设置默认加载图片
mBitmapUtils
.configDefaultLoadingImage(R.drawable.topnews_item_default);
}

@Override

public int getCount() {
return mTopNewsList.size();
}

@Override

public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}

@Override

public Object instantiateItem(ViewGroup container, int position) {
ImageView view = new ImageView(mActivity);
view.setScaleType(ScaleType.FIT_XY);// 设置图片填充效果, 表示填充父窗体
// 获取图片链接, 使用链接下载图片, 将图片设置给ImageView, 考虑内存溢出问题, 图片本地缓存
mBitmapUtils.display(view, mTopNewsList.get(position).topimage);
container.addView(view);
return view;
}

@Override

public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}

}

class NewsAdapter extends BaseAdapter {

public BitmapUtils mBitmapUtils;

public NewsAdapter() {

mBitmapUtils = new BitmapUtils(mActivity);
mBitmapUtils
.configDefaultLoadingImage(R.drawable.pic_item_list_default);
}

@Override

public int getCount() {
return mNewsList.size();
}

@Override

public News getItem(int position) {
return mNewsList.get(position);
}

@Override

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

@Override

public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = View.inflate(mActivity, R.layout.list_item_news,
null);
holder = new ViewHolder();
holder.tvTitle = (TextView) convertView
.findViewById(R.id.tv_title);
holder.tvDate = (TextView) convertView
.findViewById(R.id.tv_date);
holder.ivIcon = (ImageView) convertView
.findViewById(R.id.iv_icon);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}

News news = getItem(position);

holder.tvTitle.setText(news.title);
holder.tvDate.setText(news.pubdate);

mBitmapUtils.display(holder.ivIcon, news.listimage);

return convertView;

}

}

static class ViewHolder {

public TextView tvTitle;
public TextView tvDate;
public ImageView ivIcon;
}

}

转载于:https://www.cnblogs.com/ecollab/p/6050815.html

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