一、PullToRefresh简介
1.PullToRefresh介绍
PullToRefresh是一套实现非常好的下拉刷新库，它支持：
ListView
ExpandableListView
GridView
WebView
ScrollView
HorizontalScrollView
ViewPager
等多种常用的需要刷新的View类型，而且使用起来也十分方便。
2.PullToRefresh项目地址
https://github.com/chrisbanes/Android-PullToRefresh
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二、PullToRefresh使用
1.ListView中使用PullToRefreshListView
1）布局代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<include layout="@layout/titlebar"></include>
<com.handmark.pulltorefresh.library.PullToRefreshListView
android:id="@+id/pull_refresh_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#00000000"
android:divider="#19000000"
android:dividerHeight="4dp"
android:fadingEdge="none"
android:fastScrollEnabled="false"
android:footerDividersEnabled="false"
android:headerDividersEnabled="false"
android:smoothScrollbar="true" />
</LinearLayout>2）Activity代码
public class PullToRefreshListActivity extends ListActivity {
private LinkedList<String> mListItems;
private PullToRefreshListView mPullRefreshListView;
private ArrayAdapter<String> mAdapter;
private TextView tv_title;
private String[] mStrings = {"Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
"Allgauer Emmentaler", "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
"Allgauer Emmentaler"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ptr_list);
tv_title = (TextView) findViewById(R.id.tv_title);
tv_title.setText("PullToRefreshListView");
mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);
// Set a listener to be invoked when the list should be refreshed.
mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {
@Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
// 添加刷新时间
String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
// 请求数据
new GetDataTask().execute();
}
});
// 监听ListView最后一条
mPullRefreshListView.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
// Toast.makeText(PullToRefreshListActivity.this, "监listView的最后一条item", Toast.LENGTH_SHORT).show();
mPullRefreshListView.setMode(PULL_FROM_END);
}
});
ListView listview = mPullRefreshListView.getRefreshableView();
mListItems = new LinkedList<String>();
mListItems.addAll(Arrays.asList(mStrings));
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);
/**
*
* Add Sound Event Listener 添加事件监听声音
*/
SoundPullEventListener<ListView> soundListener = new SoundPullEventListener<ListView>(this);
soundListener.addSoundEvent(State.PULL_TO_REFRESH, R.raw.pull_event);
soundListener.addSoundEvent(State.RESET, R.raw.reset_sound);
soundListener.addSoundEvent(State.REFRESHING, R.raw.refreshing_sound);
mPullRefreshListView.setOnPullEventListener(soundListener);
// 设置适配器
listview.setAdapter(mAdapter);
mPullRefreshListView.setMode(PULL_FROM_START);
}
private class GetDataTask extends AsyncTask<Void, Void, String[]> {
@Override
protected String[] doInBackground(Void... params) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
return mStrings;
}
@Override
protected void onPostExecute(String[] result) {
if (mPullRefreshListView.getMode() == PULL_FROM_START) {
mListItems.addFirst("Added after refresh...");
} else if (mPullRefreshListView.getMode() == PULL_FROM_END) {
mListItems.addLast("Added PULL_FROM_END refresh...");
}
mAdapter.notifyDataSetChanged();
mPullRefreshListView.onRefreshComplete();
super.onPostExecute(result);
}
}
}
2.GridView中使用PullToRefreshListView
1）布局代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<include layout="@layout/titlebar"></include>
<!-- The PullToRefreshGridView replaces a standard GridView widget. -->
<com.handmark.pulltorefresh.library.PullToRefreshGridView
xmlns:ptr="http://schemas.android.com/apk/res-auto"
android:id="@+id/pull_refresh_grid"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="1dp"
android:horizontalSpacing="1dp"
android:columnWidth="100dp"
android:stretchMode="columnWidth"
android:gravity="fill"
ptr:ptrMode="both"
/>
</LinearLayout>2）Activity 代码
public class PullToRefreshGridActivity extends Activity {
private LinkedList<String> mListItems;
private PullToRefreshGridView mPullRefreshGridView;
private GridView mGridView;
private ArrayAdapter<String> mAdapter;
private TextView tv_title;
private String[] mStrings = {"Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
"Allgauer Emmentaler"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ptr_grid);
tv_title = (TextView) findViewById(R.id.tv_title);
tv_title.setText("PullToRefreshGridView");
mPullRefreshGridView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_grid);
mGridView = mPullRefreshGridView.getRefreshableView();
// 设置上拉和下拉刷新
mPullRefreshGridView.setOnRefreshListener(new OnRefreshListener2<GridView>() {
@Override
public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
Toast.makeText(PullToRefreshGridActivity.this, "下拉刷新", Toast.LENGTH_SHORT).show();
new GetDataTask().execute();
}
@Override
public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
Toast.makeText(PullToRefreshGridActivity.this, "上拉刷新", Toast.LENGTH_SHORT).show();
new GetDataTask().execute();
}
});
mListItems = new LinkedList<String>();
TextView tv = new TextView(this);
tv.setGravity(Gravity.CENTER);
tv.setText("当前没有内容，请上下刷新");
mPullRefreshGridView.setEmptyView(tv);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);
mGridView.setAdapter(mAdapter);
}
private class GetDataTask extends AsyncTask<Void, Void, String[]> {
@Override
protected String[] doInBackground(Void... params) {
// Simulates a background job.
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
return mStrings;
}
@Override
protected void onPostExecute(String[] result) {
mListItems.addFirst("Added after refresh...");
mListItems.addAll(Arrays.asList(result));
mAdapter.notifyDataSetChanged();
// Call onRefreshComplete when the list has been refreshed.
mPullRefreshGridView.onRefreshComplete();
// 添加刷新时间
String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
mPullRefreshGridView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
super.onPostExecute(result);
}
}
}
三、谢谢浏览！