最近一直在用Recyclerview展示数据,导致了ListView不怎么会用了,今天就来复习一下ListView
先看一下今天要展示的效果
先是最最最重要的依赖,没有依赖啥事也做不了
compile 'com.squareup.okhttp3:okhttp:3.9.0'
compile 'com.google.code.gson:gson:2.6.1'
compile 'com.facebook.fresco:fresco:0.9.0+'
下面就是代码,先是两个布局
activity_main这里面就一个ListView
下面是list_item这里面用到了SimpleDraweeView
我这个人有点懒,就把适配器给写到了MainActivity里面了,写在外面也一样
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.facebook.drawee.generic.GenericDraweeHierarchy;
import com.facebook.drawee.generic.GenericDraweeHierarchyBuilder;
import com.facebook.drawee.generic.RoundingParams;
import com.facebook.drawee.view.SimpleDraweeView;
import com.google.gson.Gson;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
String str="http://120.27.23.105/ad/getAd";
ListView lv;
Bean bean;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=findViewById(R.id.lv);
okURL();
}
//okhttp的网络请求
private void okURL() {
OkHttp3Utils.doGet(str, new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//Gson解析
Gson gson = new Gson();
String strs = response.body().string();
bean = gson.fromJson(strs, Bean.class);
//判断call,如果返回ture就继续执行,否则就不行
if (response.isSuccessful()) {
runOnUiThread(new Runnable() {
@Override
public void run() {
//创建适配器
MyArder adapter = new MyArder();
//设置适配器
lv.setAdapter(adapter);
//刷新适配器
adapter.notifyDataSetChanged();
}
});
}
}
});
}
//
class MyArder extends BaseAdapter{
@Override
public int getCount() {
return bean.getData().size();
}
@Override
public Object getItem(int position) {
return bean.getData().get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//初始化holder对象
ViewHolder holder;
if (convertView==null){
//把条目布局转化为view对象
convertView=View.inflate(MainActivity.this,R.layout.list_item,null);
//初始化holder对象,并初始化holder中的控件
holder=new ViewHolder();
holder.tv1=convertView.findViewById(R.id.tv1);
holder.tv2=convertView.findViewById(R.id.tv2);
holder.sv=convertView.findViewById(R.id.sv);
//给当前view做个标记,并把数据存到该tag中
convertView.setTag(holder);
}else {
//如果当前view存在,则直接从中取出其保存的控件及数据
holder=(ViewHolder) convertView.getTag();
}
holder.tv1.setText(bean.getData().get(position).getTitle());
holder.tv2.setText(bean.getData().get(position).getCreatetime());
//设置图片是否是圆形
RoundingParams params = RoundingParams.asCircle();
GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(getResources());
GenericDraweeHierarchy hierarchy = builder.setRoundingParams(params).build();
holder.sv.setHierarchy(hierarchy);
holder.sv.setImageURI(Uri.parse(bean.getData().get(position).getIcon()));
return convertView;
}
/*
* 用来存放item布局中控件的holder类
*/
class ViewHolder{
TextView tv1,tv2;
SimpleDraweeView sv;
}
}
}
import android.util.Log;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
/**
* Created by BAIPEI on 2017/12/27.
*/
public class OkHttp3Utils {
private static OkHttpClient okHttpClient = null;
public OkHttp3Utils() {
}
private static OkHttpClient getOkHttpClient() {
synchronized (OkHttp3Utils.class) {
if (okHttpClient == null) {
okHttpClient = new OkHttpClient();
}
}
return okHttpClient;
}
//上传文件
public static void loadFile(String url, File file, String fileName){
OkHttpClient okHttpClient = getOkHttpClient();
//设置文件类型
RequestBody requestBody = RequestBody.create(MediaType.parse("application/octet-stream"),file);
//设置请求体
RequestBody body = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("image",fileName,requestBody)
.build();
//请求方式
Request request = new Request.Builder().url(url).post(body).build();
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
Log.i("成功","成功");
}
});
}
/**
* 1.接口地址
* 2.接口回调
*/
public static void doGet(String url,Callback callback){
OkHttpClient okHttpClient = getOkHttpClient();
Request request = new Request.Builder().url(url).build();
okHttpClient.newCall(request).enqueue(callback);
}
/**
* 1.地址
* 2.接口回调
* 3.请求体
*/
public static void doPost(String url, Map map, Callback callback){
OkHttpClient okHttpClient = getOkHttpClient();
FormBody.Builder builder = new FormBody.Builder();
//遍历map集合 设置请求体
for (String mapKey : map.keySet()){
builder.add(mapKey,map.get(mapKey));
}
//设置请求方式
Request request = new Request.Builder().url(url).post(builder.build()).build();
//执行请求方式 接口回调
okHttpClient.newCall(request).enqueue(callback);
}
/**
*1.下载地址
*/
public static void doDown(String url,Callback callback){
OkHttpClient okHttpClient = getOkHttpClient();
Request build = new Request.Builder().url(url).build();
okHttpClient.newCall(build).enqueue(callback);
}
}
Fresco必须要初始化所以就创了个他的初始化类
import android.app.Application;
import com.facebook.drawee.backends.pipeline.Fresco;
/**
* Created by BAIPEI on 2017/12/27.
*/
public class MyApplication extends Application{
@Override
public void onCreate() {
super.onCreate();
Fresco.initialize(this);
}
}