用过很多上下拉刷新,找到一个让自己满意的确实不容易,有些好的刷新控件,也并不是公司所需要的,在这里我给大家推荐一下我所喜欢的上下拉控件,实现也挺简单,需要的不妨来用一下,效果一看便知
加载就是一个圆形进度条,一个正在加载Textview,我就不上图了
这个是刷新的头布局
这个是加载的底部局
下面是运行布局嵌套的listview布局,如果使用请换一下包名
下面是在drawable文件夹下面创建的一个文件:
这个是定义的一个接口,有刷新和加载两个方法
package jiexinkeji.com.shuaxin; public interface OnRefreshListener { /** * 下拉刷新 */ void onDownPullRefresh(); /** * 上拉加载更多 */ void onLoadingMore(); }
下面的类是继承自ListView,来实现下拉刷新上啦加载
package jiexinkeji.com.shuaxin; import android.content.Context; import android.support.v4.widget.SwipeRefreshLayout; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.AbsListView; import android.widget.ImageView; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import java.text.SimpleDateFormat; public class RefreshListView extends ListView implements AbsListView.OnScrollListener { private static final String TAG = "RefreshListView"; private int firstVisibleItemPosition; // 屏幕显示在第一个的item的索引 private int downY; // 按下时y轴的偏移量 private int headerViewHeight; // 头布局的高度 private View headerView; // 头布局的对象 private final int DOWN_PULL_REFRESH = 0; // 下拉刷新状态 private final int RELEASE_REFRESH = 1; // 松开刷新 private final int REFRESHING = 2; // 正在刷新中 private int currentState = DOWN_PULL_REFRESH; // 头布局的状态: 默认为下拉刷新状态 private Animation upAnimation; // 向上旋转的动画 private Animation downAnimation; // 向下旋转的动画 private ImageView ivArrow; // 头布局的剪头 private ProgressBar mProgressBar; // 头布局的进度条 private TextView tvState; // 头布局的状态 private TextView tvLastUpdateTime; // 头布局的最后更新时间 private OnRefreshListener mOnRefershListener; private boolean isScrollToBottom; // 是否滑动到底部 private View footerView; // 脚布局的对象 private int footerViewHeight; // 脚布局的高度 private boolean isLoadingMore = false; // 是否正在加载更多中 public RefreshListView(Context context, AttributeSet attrs) { super(context, attrs); initHeaderView(); initFooterView(); this.setOnScrollListener(this); } /** * 初始化脚布局 */ private void initFooterView() { footerView = View.inflate(getContext(), R.layout.listview_footer, null); footerView.measure(0, 0); footerViewHeight = footerView.getMeasuredHeight(); footerView.setPadding(0, -footerViewHeight, 0, 0); this.addFooterView(footerView); } /** * 初始化头布局 */ private void initHeaderView() { headerView = View.inflate(getContext(), R.layout.listview_header, null); ivArrow = (ImageView) headerView .findViewById(R.id.iv_listview_header_arrow); mProgressBar = (ProgressBar) headerView .findViewById(R.id.pb_listview_header); tvState = (TextView) headerView .findViewById(R.id.tv_listview_header_state); tvLastUpdateTime = (TextView) headerView .findViewById(R.id.tv_listview_header_last_update_time); // 设置最后刷新时间 tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime()); headerView.measure(0, 0); // 系统会帮我们测量出headerView的高度 headerViewHeight = headerView.getMeasuredHeight(); headerView.setPadding(0, -headerViewHeight, 0, 0); this.addHeaderView(headerView); // 向ListView的顶部添加一个view对象 initAnimation(); } /** * 获得系统的最新时间 * * @return */ private String getLastUpdateTime() { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return sdf.format(System.currentTimeMillis()); } /** * 初始化动画 */ private void initAnimation() { upAnimation = new RotateAnimation(0f, -180f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); upAnimation.setDuration(500); upAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上 downAnimation = new RotateAnimation(-180f, -360f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); downAnimation.setDuration(500); downAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上 } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN : downY = (int) ev.getY(); break; case MotionEvent.ACTION_MOVE : int moveY = (int) ev.getY(); // 移动中的y - 按下的y = 间距. int diff = (moveY - downY) / 2; // -头布局的高度 + 间距 = paddingTop int paddingTop = -headerViewHeight + diff; // 如果: -头布局的高度 > paddingTop的值 执行super.onTouchEvent(ev); if (firstVisibleItemPosition == 0 && -headerViewHeight < paddingTop) { if (paddingTop > 0 && currentState == DOWN_PULL_REFRESH) { // 完全显示了. Log.i(TAG, "松开刷新"); currentState = RELEASE_REFRESH; refreshHeaderView(); } else if (paddingTop < 0 && currentState == RELEASE_REFRESH) { // 没有显示完全 Log.i(TAG, "下拉刷新"); currentState = DOWN_PULL_REFRESH; refreshHeaderView(); } // 下拉头布局 headerView.setPadding(0, paddingTop, 0, 0); return true; } break; case MotionEvent.ACTION_UP : // 判断当前的状态是松开刷新还是下拉刷新 if (currentState == RELEASE_REFRESH) { Log.i(TAG, "刷新数据."); // 把头布局设置为完全显示状态 headerView.setPadding(0, 0, 0, 0); // 进入到正在刷新中状态 currentState = REFRESHING; refreshHeaderView(); if (mOnRefershListener != null) { mOnRefershListener.onDownPullRefresh(); // 调用使用者的监听方法 } } else if (currentState == DOWN_PULL_REFRESH) { // 隐藏头布局 headerView.setPadding(0, -headerViewHeight, 0, 0); } break; default : break; } return super.onTouchEvent(ev); } /** * 根据currentState刷新头布局的状态 */ private void refreshHeaderView() { switch (currentState) { case DOWN_PULL_REFRESH : // 下拉刷新状态 tvState.setText("下拉刷新"); ivArrow.startAnimation(downAnimation); // 执行向下旋转 break; case RELEASE_REFRESH : // 松开刷新状态 tvState.setText("松开刷新"); ivArrow.startAnimation(upAnimation); // 执行向上旋转 break; case REFRESHING : // 正在刷新中状态 ivArrow.clearAnimation(); ivArrow.setVisibility(View.GONE); mProgressBar.setVisibility(View.VISIBLE); tvState.setText("正在刷新中..."); break; default : break; } } /** * 当滚动状态改变时回调 */ @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_FLING) { // 判断当前是否已经到了底部 if (isScrollToBottom && !isLoadingMore) { isLoadingMore = true; // 当前到底部 Log.i(TAG, "加载更多数据"); footerView.setPadding(0, 0, 0, 0); this.setSelection(this.getCount()); if (mOnRefershListener != null) { mOnRefershListener.onLoadingMore(); } } } } /** * 当滚动时调用 * * @param firstVisibleItem * 当前屏幕显示在顶部的item的position * @param visibleItemCount * 当前屏幕显示了多少个条目的总数 * @param totalItemCount * ListView的总条目的总数 */ @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { firstVisibleItemPosition = firstVisibleItem; if (getLastVisiblePosition() == (totalItemCount - 1)) { isScrollToBottom = true; } else { isScrollToBottom = false; } } /** * 设置刷新监听事件 * * @param listener */ public void setOnRefreshListener(OnRefreshListener listener) { mOnRefershListener = listener; } /** * 隐藏头布局 */ public void hideHeaderView() { headerView.setPadding(0, -headerViewHeight, 0, 0); ivArrow.setVisibility(View.VISIBLE); mProgressBar.setVisibility(View.GONE); tvState.setText("下拉刷新"); tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime()); currentState = DOWN_PULL_REFRESH; } /** * 隐藏脚布局 */ public void hideFooterView() { footerView.setPadding(0, -footerViewHeight, 0, 0); isLoadingMore = false; } }
接下来再运行主Activity使用就行了
package jiexinkeji.com.shuaxin; import android.app.Activity; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public class MainActivity extends Activity implements OnRefreshListener { private ListtextList; private MyAdapter adapter; private RefreshListView rListView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); rListView = (RefreshListView) findViewById(R.id.refreshlistview); textList = new ArrayList (); for (int i = 0; i < 25; i++) { textList.add("这是一条ListView的数据" + i); } adapter = new MyAdapter(); rListView.setAdapter(adapter); rListView.setOnRefreshListener(this); } private class MyAdapter extends BaseAdapter { @Override public int getCount() { // TODO Auto-generated method stub return textList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return textList.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub TextView textView = new TextView(MainActivity.this); textView.setText(textList.get(position)); textView.setTextSize(18.0f); return textView; } } @Override public void onDownPullRefresh() { new AsyncTask () { @Override protected Void doInBackground(Void... params) { SystemClock.sleep(2000); for (int i = 0; i < 2; i++) { textList.add(0, "这是下拉刷新出来的数据" + i); } return null; } @Override protected void onPostExecute(Void result) { adapter.notifyDataSetChanged(); rListView.hideHeaderView(); } }.execute(new Void[]{}); } @Override public void onLoadingMore() { new AsyncTask () { @Override protected Void doInBackground(Void... params) { SystemClock.sleep(5000); textList.add("这是加载更多出来的数据1"); textList.add("这是加载更多出来的数据2"); textList.add("这是加载更多出来的数据3"); return null; } @Override protected void onPostExecute(Void result) { adapter.notifyDataSetChanged(); // 控制脚布局隐藏 rListView.hideFooterView(); } }.execute(new Void[]{}); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。