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首页 / 移动开发 / Android / Android使用PullToRefresh实现上拉加载和下拉刷新效果的代码

在没给大家介绍正文之前,先给大家介绍展示下运行图,如果大家感觉还不错,请继续往下阅读:

相关阅读:分享Android中pullToRefresh的使用心得


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 23buildToolsVersion "24.0.0"defaultConfig {minSdkVersion 18targetSdkVersion 23}buildTypes {release {minifyEnabled falseproguardFiles 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

<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.nanchen.pulltorefreshdemo.MainActivity"><com.handmark.pulltorefresh.library.PullToRefreshListViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/main_pull_refresh_lv"app:ptrAnimationStyle="flip"app:ptrHeaderBackground="@android:color/transparent"app:ptrHeaderTextColor="#919191"/></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。
package com.example.nanchen.pulltorefreshdemo;/** * Created by 南尘 on 16-7-20. */public class Music {private String title;private String singer;public Music() {}public Music(String title, String singer) {this.title = title;this.singer = singer;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getSinger() {return singer;}public void setSinger(String singer) {this.singer = singer;}}
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"><TextViewandroid: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"/><TextViewandroid: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。
package com.example.nanchen.pulltorefreshdemo;import android.content.Context;import android.os.AsyncTask;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;import com.handmark.pulltorefresh.library.ILoadingLayout;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {private PullToRefreshListView refresh_lv;private List<Music> list;private DataAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);refresh_lv = (PullToRefreshListView) findViewById(R.id.main_pull_refresh_lv);list = new ArrayList<>();//设置可上拉刷新和下拉刷新refresh_lv.setMode(PullToRefreshBase.Mode.BOTH);//设置刷新时显示的文本ILoadingLayout startLayout = refresh_lv.getLoadingLayoutProxy(true,false);startLayout.setPullLabel("正在下拉刷新...");startLayout.setRefreshingLabel("正在玩命加载中...");startLayout.setReleaseLabel("放开以刷新");ILoadingLayout endLayout = refresh_lv.getLoadingLayoutProxy(false,true);endLayout.setPullLabel("正在上拉刷新...");endLayout.setRefreshingLabel("正在玩命加载中...");endLayout.setReleaseLabel("放开以刷新");refresh_lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {@Overridepublic void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {new LoadDataAsyncTask(MainActivity.this).execute();}@Overridepublic void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {new LoadDataAsyncTask(MainActivity.this).execute();}});loadData();adapter = new DataAdapter(this,list);refresh_lv.setAdapter(adapter);}private int count = 1;private void loadData(){for (int i = 0; i < 10; i++) {list.add(new Music("歌曲"+count,"歌手"+count));count++;}}/** * 异步下载任务 */private static class LoadDataAsyncTask extends AsyncTask<Void,Void,String>{private MainActivity mainActivity;public LoadDataAsyncTask(MainActivity mainActivity) {this.mainActivity = mainActivity;}@Overrideprotected String doInBackground(Void... params) {try {Thread.sleep(2000);mainActivity.loadData();return "seccess";} catch (InterruptedException e) {e.printStackTrace();}return null;}/** * 完成时的方法 */@Overrideprotected void onPostExecute(String s) {super.onPostExecute(s);if (s.equals("seccess")){mainActivity.adapter.notifyDataSetChanged();mainActivity.refresh_lv.onRefreshComplete();//刷新完成}}}/** * 自定义适配器 */private static class DataAdapter extends BaseAdapter{private Context context;private List<Music> list;public DataAdapter(Context context, List<Music> list) {this.context = context;this.list = list;}@Overridepublic int getCount() {if (list != null){return list.size();}return 0;}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder vh;if (convertView == null){convertView = LayoutInflater.from(context).inflate(R.layout.list_item,parent,false);vh = new ViewHolder();vh.tv_title = (TextView) convertView.findViewById(R.id.item_title);vh.tv_singer = (TextView) convertView.findViewById(R.id.item_singer);convertView.setTag(vh);}else{vh = (ViewHolder) convertView.getTag();}Music music = (Music) getItem(position);vh.tv_title.setText(music.getTitle());vh.tv_singer.setText(music.getSinger());return convertView;}class ViewHolder{TextView tv_title;TextView tv_singer;}}}
以上所述是小编给大家介绍的Android使用PullToRefresh实现上拉加载和下拉刷新效果的代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!