android简易下拉刷新测试

public class MainActivity extends Activity implements OnRefreshListener {private List> list;private PullToRefreshListView listView;private MyAdapter adapter;private int count = 0;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case 0:// 下拉刷新listView.onRefreshComplete();if (list.size() < 30)listView.setLoadMore(true);break;case 1:// 加载更多adapter.notifyDataSetChanged();listView.onRefreshComplete();if (list.size() >= 30)listView.setLoadMore(false);break;default:break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (PullToRefreshListView) findViewById(R.id.listview);list = new ArrayList>();adapter = new MyAdapter(this, list);listView.setAdapter(adapter);listView.setOnRefreshListener(this);initListData();}public void getData() {Map map = new HashMap();map.put("image", R.drawable.ic_launcher);map.put("title", "这是标题" + count);map.put("info", "这是一个详细详细信息" + count);list.add(map);count++;}public void initListData() {handler.postDelayed(new Runnable() {@Overridepublic void run() {getData();((BaseAdapter) adapter).notifyDataSetChanged();handler.sendEmptyMessage(0);}}, 10);}@Overridepublic void onDownPullRefresh() {handler.postDelayed(new Runnable() {@Overridepublic void run() {getData();((BaseAdapter) adapter).notifyDataSetChanged();handler.sendEmptyMessage(0);}}, 3000);}@Overridepublic void onLoadingMore() {getData();handler.postDelayed(new Runnable() {@Overridepublic void run() {getData();((BaseAdapter) adapter).notifyDataSetChanged();handler.sendEmptyMessage(1);}}, 3000);}}class PullToRefreshListView extends ListView implements OnScrollListener {private static final String TAG = "chenqy";private int firstVisibleItemPosition;private int downY;private int headerViewHeight;private int footerViewHeight;private View headerView;private View footerView;private final int DOWN_PULL_REFRESH = 0;private final int RELEASE_REFRESH = 1;private final int REFRESHING = 2;private int currentState = DOWN_PULL_REFRESH;private ProgressBar mProgressBar;private TextView tvState;private OnRefreshListener mOnRefershListener;private boolean isScrollToBottom;private boolean isLoadingMore = false;private boolean isLoadMore = true;// 实际的padding的距离与界面上偏移距离的比例，越大，拉的越费劲(阻尼系数，damping ratio)private final static float RATIO = 3.6f;public PullToRefreshListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);}public PullToRefreshListView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public PullToRefreshListView(Context context) {super(context);init(context);}private void init(Context context) {initHeaderView(context);initFooterView(context);this.setOnScrollListener(this);}@Overridepublic 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();int diff = (int) (((float) moveY - (float) downY) / RATIO);int paddingTop = -headerViewHeight + diff;if (firstVisibleItemPosition == 0 && diff > 0&& currentState != REFRESHING && !isLoadingMore) {if (paddingTop > 0 && currentState == DOWN_PULL_REFRESH) {currentState = RELEASE_REFRESH;tvState.setText("松开刷新");} else if (paddingTop < 0 && currentState == RELEASE_REFRESH) {currentState = DOWN_PULL_REFRESH;tvState.setText("下拉刷新");}headerView.setPadding(0, paddingTop, 0, 0); // 显示下拉移动效果return true;}break;case MotionEvent.ACTION_UP:if (currentState == RELEASE_REFRESH) {headerView.setPadding(0, 0, 0, 0);currentState = REFRESHING;mProgressBar.setVisibility(View.VISIBLE);tvState.setText("正在刷新中...");if (mOnRefershListener != null) {mOnRefershListener.onDownPullRefresh();}} else if (currentState == DOWN_PULL_REFRESH) {headerView.setPadding(0, -headerViewHeight, 0, 0);}break;default:break;}return super.onTouchEvent(ev);}@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_FLING) {if (isScrollToBottom && !isLoadingMore && isLoadMore()&& currentState != REFRESHING) {isLoadingMore = true;Log.i(TAG, "加载更多数据-" + this.getCount());footerView.setPadding(0, 0, 0, 0);if (mOnRefershListener != null) {mOnRefershListener.onLoadingMore();}}}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {firstVisibleItemPosition = firstVisibleItem;if (getLastVisiblePosition() == (totalItemCount - 1)) {isScrollToBottom = true;} else {isScrollToBottom = false;}}private void initFooterView(Context context) {footerView = LinearLayout.inflate(context, R.layout.listview_foot, null);footerView.measure(0, 0);footerViewHeight = footerView.getMeasuredHeight();footerView.setPadding(0, -footerViewHeight, 0, 0);// 将底部隐藏this.addFooterView(footerView);}private void initHeaderView(Context context) {headerView = LinearLayout.inflate(context, R.layout.listview_header, null);mProgressBar = (ProgressBar) headerView.findViewById(R.id.pb_listview_header);tvState = (TextView) headerView.findViewById(R.id.tv_listview_header_state);headerView.measure(0, 0);headerViewHeight = headerView.getMeasuredHeight();headerView.setPadding(0, -headerViewHeight, 0, 0);// 将头部隐藏this.addHeaderView(headerView);}public void onRefreshComplete() {if (isLoadingMore) {hideFooterView();} else if (currentState == REFRESHING) {hideHeaderView();}}private void hideHeaderView() {headerView.setPadding(0, -headerViewHeight, 0, 0);mProgressBar.setVisibility(View.GONE);tvState.setText("下拉刷新");currentState = DOWN_PULL_REFRESH;}private void hideFooterView() {footerView.setPadding(0, -footerViewHeight, 0, 0);isLoadingMore = false;}public void setOnRefreshListener(OnRefreshListener listener) {mOnRefershListener = listener;}public interface OnRefreshListener {void onDownPullRefresh();void onLoadingMore();}public interface onDownPullRefresh {public void onRefresh();}public boolean isLoadMore() {return isLoadMore;}public void setLoadMore(boolean isLoadMore) {this.isLoadMore = isLoadMore;}}class MyAdapter extends BaseAdapter {private List> data;private LayoutInflater layoutInflater;public MyAdapter(Context context, List> data) {this.data = data;this.layoutInflater = LayoutInflater.from(context);}public final class ComponentView {public ImageView image;public TextView title;public Button view;public TextView info;}@Overridepublic int getCount() {return data.size();}@Overridepublic Object getItem(int position) {return data.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ComponentView cv = null;if (convertView == null) {cv = new ComponentView();convertView = layoutInflater.inflate(R.layout.mylist, null);cv.image = (ImageView) convertView.findViewById(R.id.image);cv.title = (TextView) convertView.findViewById(R.id.title);cv.view = (Button) convertView.findViewById(R.id.view);cv.info = (TextView) convertView.findViewById(R.id.info);convertView.setTag(cv);} else {cv = (ComponentView) convertView.getTag();}cv.image.setBackgroundResource((Integer) data.get(position).get("image"));cv.title.setText((String) data.get(position).get("title"));cv.info.setText((String) data.get(position).get("info"));return convertView;}}

main布局：

header布局：

<?xml version="1.0" encoding="utf-8"?>

foot布局：

<?xml version="1.0" encoding="utf-8"?>

list布局：

<?xml version="1.0" encoding="utf-8"?>

效果：

更多相关文章

随机推荐