一、PullToRefresh簡介
1.PullToRefresh介紹
PullToRefresh是一套實現非常好的下拉刷新庫，它支持：
ListView
ExpandableListView
GridView
WebView
ScrollView
HorizontalScrollView
ViewPager
等多種常用的需要刷新的View類型，而且使用起來也十分方便。
2.PullToRefresh項目地址
https://github.com/chrisbanes/Android-PullToRefresh
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二、PullToRefresh使用
1.ListView中使用PullToRefreshListView
1）佈局代碼
<?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代碼
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) {
// 添加刷新時間
String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
// 請求數據
new GetDataTask().execute();
}
});
// 監聽ListView最後一條
mPullRefreshListView.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
// Toast.makeText(PullToRefreshListActivity.this, "監listView的最後一條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 添加事件監聽聲音
*/
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);
// 設置適配器
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）佈局代碼
<?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 代碼
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();
// 設置上拉和下拉刷新
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("當前沒有內容，請上下刷新");
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();
// 添加刷新時間
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、謝謝瀏覽！