其实很早前写过官方的下拉刷新控件SwipeRefreshLayout,但是这个控件仅仅支持下拉刷新,用起来还算可以。然而在我们实际开发应用中,很多地方都不止有下拉刷新,而且还有上拉加载的功能。当然,你完全可以自己写layout通过add的方式实现,但是既然有开源的力量让我们有幸能用到PullToRefresh这个资源,那为何不用呢?当然网上不止这个第三方包可实现,我这里就先用这个版本了。
先上一波运行图:
项目已同步至:https://github.com/nanchen2251/pullToRefreshDemo
简单使用详情:
1)studio可以直接在app的module设置中直接进行搜索,但是有-的必须添上,而不能用空格代替,为了更加了解这个东西,我还是推荐大家去这里看看,奉上网址:
https://github.com/chrisbanes/Android-PullToRefresh
所以去git上下载了后通过studio的导入Module功能,导入library,修改library的gradle文件和自己的项目一致
apply plugin: 'com.android.library'
android {
compileSdkVersion 23
buildToolsVersion "24.0.0"
defaultConfig {
minSdkVersion 18
targetSdkVersion 23
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
2)然后添加依赖,将app与其进行关联。
3)下面打开library可以看到很多的东西,这个不仅可以支持ListView,还可以支持GridView和ScollView等等,可谓相当全面,不过是否能和当前火热的RecyclerView一起使用楼主还没试过。
4)下面在我们的xml布局中布局,这里我用了自定义控件的属性,所以添加了一个xmlns:app="http://schemas.android.com/apk/res-auto"
1 <?xml version="1.0" encoding="utf-8"?>
2 <RelativeLayout
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 xmlns:tools="http://schemas.android.com/tools"
5 xmlns:app="http://schemas.android.com/apk/res-auto"
6 android:layout_width="match_parent"
7 android:layout_height="match_parent"
8 tools:context="com.example.nanchen.pulltorefreshdemo.MainActivity">
9
10 <com.handmark.pulltorefresh.library.PullToRefreshListView
11 android:layout_width="match_parent"
12 android:layout_height="match_parent"
13 android:id="@+id/main_pull_refresh_lv"
14 app:ptrAnimationStyle="flip"
15 app:ptrHeaderBackground="@android:color/transparent"
16 app:ptrHeaderTextColor="#919191"/>
17
18 </RelativeLayout>
5)由于我们这里使用的是它的ListView,所以我们需要一个java Bean 和一个Item的layout进行自定义布局。
1 package com.example.nanchen.pulltorefreshdemo;
2
3 /**
4 * Created by 南尘 on 16-7-20.
5 */
6 public class Music {
7
8 private String title;
9 private String singer;
10
11 public Music() {
12 }
13
14 public Music(String title, String singer) {
15 this.title = title;
16 this.singer = singer;
17 }
18
19 public String getTitle() {
20 return title;
21 }
22
23 public void setTitle(String title) {
24 this.title = title;
25 }
26
27 public String getSinger() {
28 return singer;
29 }
30
31 public void setSinger(String singer) {
32 this.singer = singer;
33 }
34 }
还有list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/item_title"
android:text="歌曲1"
android:textSize="20sp"
android:layout_alignParentLeft="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/item_singer"
android:textSize="20sp"
android:text="歌手1"
android:layout_alignParentRight="true"/>
</RelativeLayout>
6)使用非常简单,在Activity中,代码注释已经比较全面了,这里模拟了异步下载数据任务,并且重写了Adaper,至于其中为什么用静态内部类,这个好处很多,大家可以百度科普。
1 package com.example.nanchen.pulltorefreshdemo;
2
3 import android.content.Context;
4 import android.os.AsyncTask;
5 import android.os.Bundle;
6 import android.support.v7.app.AppCompatActivity;
7 import android.view.LayoutInflater;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.widget.BaseAdapter;
11 import android.widget.ListView;
12 import android.widget.TextView;
13
14 import com.handmark.pulltorefresh.library.ILoadingLayout;
15 import com.handmark.pulltorefresh.library.PullToRefreshBase;
16 import com.handmark.pulltorefresh.library.PullToRefreshListView;
17
18 import java.util.ArrayList;
19 import java.util.List;
20
21 public class MainActivity extends AppCompatActivity {
22
23 private PullToRefreshListView refresh_lv;
24 private List<Music> list;
25 private DataAdapter adapter;
26
27 @Override
28 protected void onCreate(Bundle savedInstanceState) {
29 super.onCreate(savedInstanceState);
30 setContentView(R.layout.activity_main);
31
32 refresh_lv = (PullToRefreshListView) findViewById(R.id.main_pull_refresh_lv);
33 list = new ArrayList<>();
34
35 //设置可上拉刷新和下拉刷新
36 refresh_lv.setMode(PullToRefreshBase.Mode.BOTH);
37
38 //设置刷新时显示的文本
39 ILoadingLayout startLayout = refresh_lv.getLoadingLayoutProxy(true,false);
40 startLayout.setPullLabel("正在下拉刷新...");
41 startLayout.setRefreshingLabel("正在玩命加载中...");
42 startLayout.setReleaseLabel("放开以刷新");
43
44
45 ILoadingLayout endLayout = refresh_lv.getLoadingLayoutProxy(false,true);
46 endLayout.setPullLabel("正在上拉刷新...");
47 endLayout.setRefreshingLabel("正在玩命加载中...");
48 endLayout.setReleaseLabel("放开以刷新");
49
50
51 refresh_lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
52 @Override
53 public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
54 new LoadDataAsyncTask(MainActivity.this).execute();
55 }
56
57 @Override
58 public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
59 new LoadDataAsyncTask(MainActivity.this).execute();
60 }
61 });
62
63
64 loadData();
65 adapter = new DataAdapter(this,list);
66 refresh_lv.setAdapter(adapter);
67 }
68
69 private int count = 1;
70 private void loadData(){
71 for (int i = 0; i < 10; i++) {
72 list.add(new Music("歌曲"+count,"歌手"+count));
73 count++;
74 }
75 }
76
77 /**
78 * 异步下载任务
79 */
80 private static class LoadDataAsyncTask extends AsyncTask<Void,Void,String>{
81
82 private MainActivity mainActivity;
83
84 public LoadDataAsyncTask(MainActivity mainActivity) {
85 this.mainActivity = mainActivity;
86 }
87
88 @Override
89 protected String doInBackground(Void... params) {
90 try {
91 Thread.sleep(2000);
92 mainActivity.loadData();
93 return "seccess";
94 } catch (InterruptedException e) {
95 e.printStackTrace();
96 }
97 return null;
98 }
99
100 /**
101 * 完成时的方法
102 */
103 @Override
104 protected void onPostExecute(String s) {
105 super.onPostExecute(s);
106 if (s.equals("seccess")){
107 mainActivity.adapter.notifyDataSetChanged();
108 mainActivity.refresh_lv.onRefreshComplete();//刷新完成
109 }
110 }
111 }
112
113 /**
114 * 自定义适配器
115 */
116 private static class DataAdapter extends BaseAdapter{
117
118 private Context context;
119 private List<Music> list;
120
121 public DataAdapter(Context context, List<Music> list) {
122 this.context = context;
123 this.list = list;
124 }
125
126 @Override
127 public int getCount() {
128 if (list != null){
129 return list.size();
130 }
131 return 0;
132 }
133
134 @Override
135 public Object getItem(int position) {
136 return list.get(position);
137 }
138
139 @Override
140 public long getItemId(int position) {
141 return position;
142 }
143
144 @Override
145 public View getView(int position, View convertView, ViewGroup parent) {
146 ViewHolder vh;
147 if (convertView == null){
148 convertView = LayoutInflater.from(context).inflate(R.layout.list_item,parent,false);
149 vh = new ViewHolder();
150 vh.tv_title = (TextView) convertView.findViewById(R.id.item_title);
151 vh.tv_singer = (TextView) convertView.findViewById(R.id.item_singer);
152 convertView.setTag(vh);
153 }else{
154 vh = (ViewHolder) convertView.getTag();
155 }
156 Music music = (Music) getItem(position);
157 vh.tv_title.setText(music.getTitle());
158 vh.tv_singer.setText(music.getSinger());
159 return convertView;
160 }
161
162 class ViewHolder{
163 TextView tv_title;
164 TextView tv_singer;
165 }
166 }
167 }