谷歌发布了新的Gmail应用程序,并提供了另一种处理下拉菜单的方法。
而不是显示已下拉的已启动隐藏行。 Gmail会在操作栏上方显示动画消息。
该讯息包含一条动画水平线。
这是Android SDK的标准功能吗?我在动作栏API中找不到任何可以执行此操作的内容。
答案 0 :(得分:48)
Google已直接在SDK中发布对此的支持。我不确定你需要支持哪个版本(这可能是一个问题)。
在此处查看官方SDK功能信息:http://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html
如果你能够使用SDK,那么你会更好,甚至Chris Banes写了一篇post,提出了同样的建议。
答案 1 :(得分:22)
Chris Banes' ActionBar-PullToRefresh library on GitHub可能提供最接近GMail应用程序的pull-to-refresh功能。
答案 2 :(得分:10)
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"};
}
}
答案 3 :(得分:3)
Chris Banes(为Android实现最佳刷新组件的同一个人)也实现了像{1}}一样的Pull To Refresh。
您可以在此处找到它:https://github.com/chrisbanes/ActionBar-PullToRefresh
请注意,此项目仍处于开发阶段,因此当前的API可能会发生变化。
答案 4 :(得分:1)
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;
}
}
答案 5 :(得分:0)
测试一下。 使用: swipeRefreshLayout.setRotation(180F);
在适配器ListView中,方法getView: view.setRotation(180F);
按列表中的商品顺序颠倒。
或直接使用android:rotation =&#34; 180&#34;在xml。