如何实现“刷新刷新”就像在新的GMail应用程序
谷歌发布新的Gmail应用程序，以处理下拉刷新的替代方式。
而不是显示开始隐藏的行被拉下来。 Gmail会在操作栏上方显示animation消息。
该消息包含一条animation水平线。
这是Android SDK的标准function吗？ 我无法find任何可以做到这一点的操作栏API。
Chris Banes在GitHub上的ActionBar-PullToRefresh库可能提供最接近GMail应用程序的拉到刷新function。
另见： JuhaniLehtimäki对GMail拉到刷新的分析 。
Google直接在SDK中发布了对此的支持。 我不确定你需要支持哪个版本（这可能是一个问题）。
看看这里的官方SDKfunction信息： http : //developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html
如果你能够使用SDK，那么你会变得更好，甚至Chris Banes写了一篇文章 ，暗示着同样的道理。
试试这个…这对我有用。
RES /布局/ activity_main.xml中
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.swipetorefresh.MainActivity" tools:ignore="MergeRootFrame" /> RES /布局/ fragment_main.xml
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" tools:ignore="MergeRootFrame" > <ListView android:id="@android:id/list" android:layout_width="match_parent" android:layout_height="match_parent" /> </android.support.v4.widget.SwipeRefreshLayout>
MainActivity.java
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState == null) { getFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } } public static class PlaceholderFragment extends ListFragment implements OnRefreshListener { private SwipeRefreshLayout mSwipeRefreshLayout; private static final int LIST_ITEM_COUNT = 5; private int mOffset = 0; private ArrayAdapter<String> mListAdapter; public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); // Configure the swipe refresh layout mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.container); mSwipeRefreshLayout.setOnRefreshListener(this); mSwipeRefreshLayout.setColorScheme( R.color.swipe_color_1, R.color.swipe_color_2, R.color.swipe_color_3, R.color.swipe_color_4); // Put the first batch of countries in the list mListAdapter = new ArrayAdapter<String>( getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1, getCountries(mOffset)); setListAdapter(mListAdapter); return rootView; } private List<String> getCountries(int offset) { ArrayList<String> countriesList = new ArrayList<String>(); for(int i=0; i<LIST_ITEM_COUNT;i++){ countriesList.add(COUNTRIES[offset+i]); } mOffset = offset + LIST_ITEM_COUNT; return countriesList; } @Override public void onRefresh() { // Start showing the refresh animation mSwipeRefreshLayout.setRefreshing(true); // Simulate a long running activity new Handler().postDelayed(new Runnable() { @Override public void run() { updateCountries(); } }, 5000); } private void updateCountries() { // Add the next batch of countries to the list mListAdapter.addAll(getCountries(mOffset)); // Signify that we are done refreshing mSwipeRefreshLayout.setRefreshing(false); } private static final String[] COUNTRIES = {"Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla", "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia", "Aruba", "Australia", "Austria", "Azerbaijan", "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin", "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina", "Botswana", "Brazil", "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi", "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands", "Central African Republic", "Chad", "Chile", "China", "Christmas Island", "Cocos (Keeling) Islands", "Colombia", "Comoros", "Democratic Republic of the Congo (Kinshasa)", "Congo, Republic of(Brazzaville)", "Cook Islands", "Costa Rica", "Ivory Coast", "Croatia", "Cuba", "Cyprus", "Czech Republic", "Denmark", "Djibouti", "Dominica", "Dominican Republic", "East Timor (Timor-Leste)", "Ecuador", "Egypt", "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia"}; } }
克里斯·巴恩斯（Chris Banes）（同样是为Android刷新组件的人）也实现了像拉到刷新的Gmail 。
你可以在这里find它： https ： //github.com/chrisbanes/ActionBar-PullToRefresh
请注意，这个项目还在开发中，所以目前的API可能会改变。
fragment_main.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.testloading.MainActivity$PlaceholderFragment" > <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout> counteries.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/text_view" android:layout_width="match_parent" android:layout_height="47dp" android:gravity="center_vertical" android:textStyle="bold"/> </LinearLayout> package com.example.testloading; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.app.ActionBarActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends ActionBarActivity { private static final String TAG = MainActivity.class.getSimpleName(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { private ListView listView; private static final int LIST_ITEM_COUNT = 20; private int mOffset = 0; private boolean flag_loading; private MyAdapter adapter; private List<String> list; public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); listView = (ListView) rootView.findViewById(R.id.list); list = getCountries(mOffset); adapter = new MyAdapter(list, getActivity()); listView.setAdapter(adapter); listView.setOnScrollListener(new OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { Log.d(TAG, "firstVisibleItem : " + firstVisibleItem + " , visibleItemCount : " + visibleItemCount + " , totalItemCount : " + totalItemCount); if (firstVisibleItem + visibleItemCount == totalItemCount) { Log.d(TAG, "ZZZ offSet : " + mOffset); if (COUNTRIES.length > mOffset) { if (flag_loading == false) { Log.d(TAG, "ZZZ inside : "); flag_loading = true; additems(); } } } } }); return rootView; } protected void additems() { list.addAll(getCountries(mOffset)); adapter.notifyDataSetChanged(); listView.invalidate(); flag_loading = false; } private List<String> getCountries(int offset) { ArrayList<String> countriesList = new ArrayList<String>(); for (int i = 0; i < LIST_ITEM_COUNT; i++) { if (COUNTRIES.length > offset + i) { countriesList.add(COUNTRIES[offset + i]); } } mOffset = offset + LIST_ITEM_COUNT; return countriesList; } private static final String[] COUNTRIES = { "Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla", "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia", "Aruba", "Australia", "Austria", "Azerbaijan", "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin", "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina", "Botswana", "Brazil", "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi", "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands", "Central African Republic", "Chad", "Chile", "China", "Christmas Island", "Cocos (Keeling) Islands", "Colombia", "Comoros", "Democratic Republic of the Congo (Kinshasa)", "Congo, Republic of(Brazzaville)", "Cook Islands", "Costa Rica", "Ivory Coast", "Croatia", "Cuba", "Cyprus", "Czech Republic", "Denmark", "Djibouti", "Dominica", "Dominican Republic", "East Timor (Timor-Leste)", "Ecuador", "Egypt", "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia" }; } } class MyAdapter extends BaseAdapter { private List<String> list; private LayoutInflater layoutInflater; public MyAdapter(List<String> list, Context context) { this.list = list; layoutInflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int arg0) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup arg2) { ViewHolder viewHolder; if (convertView == null) { convertView = layoutInflater.inflate(R.layout.counteries, null); viewHolder = new ViewHolder(); viewHolder.textView = (TextView) convertView .findViewById(R.id.text_view); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.textView.setText(list.get(position)); return convertView; } class ViewHolder { public TextView textView; } }
testing它。 使用：swipeRefreshLayout.setRotation（180f）;
而在你的适配器ListView中，方法getView：view.setRotation（180f）;
在列表中反转您的项目的顺序。
或者在xml中直接使用android：rotation =“180”。
