Android开发-Retrofit-AndroidStudio(三)ListView&Picasso

转载请注明出处：http://blog.csdn.net/iwanghang/article/details/53172895

项目源码下载：http://download.csdn.net/detail/iwanghang/9683583(免积分)

直接看下效果图：



这个Demo里，我们用了Picasso的jar包，这个jar包跟Retrofit是同一家公司的。这是一个图片下载jar包。



MyAdapter.java:

package com.iwanghang.retrofitdemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.Collection;
import java.util.List;

public class MyAdapter extends BaseAdapter {

private Context context;
private List<Cook> list;

public MyAdapter(Context context, List<Cook> list) {
this.context = context;
this.list = list;
}

@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int position) {
return list.get(position);
}

@Override
public long getItemId(int position) {
return list.get(position).getId();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null){
convertView = LayoutInflater.from(context).inflate(R.layout.item,
parent ,false);
convertView.setTag(new ViewHolder(convertView));
}
ViewHolder holder = (ViewHolder) convertView.getTag();
Cook cook = list.get(position);
holder.title.setText(cook.getName());
holder.info.setText(cook.getDescription());
Picasso.with(context).load("http://tnfs.tngou.net/img" + cook.getImg()).into(holder.image);
return convertView;
}

public void addAll(Collection<? extends Cook> collection){
list.addAll(collection);
notifyDataSetChanged();
}

public static class ViewHolder{
private TextView info;
private TextView title;
private ImageView image;

public ViewHolder(View item){
image = ((ImageView) item.findViewById(R.id.item_image));
title = ((TextView) item.findViewById(R.id.item_title));
info = ((TextView) item.findViewById(R.id.item_info));
}
}
}

Service.java:

package com.iwanghang.retrofitdemo;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Path;
import retrofit2.http.Query;

/**
* http://www.tngou.net/api/cook/71 * http://www.tngou.net/api/top/list *
* 请求参数
*  参数	必选	类型	说明
* page	否	int	请求页数，默认page=1
* rows	否	int	每页返回的条数，默认rows=20
* id	否	int	分类ID，默认返回的是全部。这里的ID就是指分类
*
* @Query 表示注解
*/
public interface Service {
//@GET("/api/cook/list")
//Call<Tngou> getList(@Query("id") int id, @Query("page") int page, @Query("rows") int rows);

// {category} 分类，可能是cook，也可能是top
@GET("/api/{category}/list")
Call<Tngou> getList(@Path("category") String category, @Query("id") int id, @Query("page") int page, @Query("rows") int rows);
}

Tngou.java:

package com.iwanghang.retrofitdemo;

import com.google.gson.annotations.SerializedName;

import java.util.List;

/**
* @SerializedName 表示注解
*/
public class Tngou {
@SerializedName("status")
private boolean status;
@SerializedName("total")
private int total;
@SerializedName("tngou")
private List<Cook> list;

public boolean isStatus() {
return status;
}

public void setStatus(boolean status) {
this.status = status;
}

public int getTotal() {
return total;
}

public void setTotal(int total) {
this.total = total;
}

public List<Cook> getList() {
return list;
}

public void setList(List<Cook> list) {
this.list = list;
}
}

MainActivity.java:

package com.iwanghang.retrofitdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.Toast;

import com.iwanghang.retrofitdemo.gson.GsonConverterFactory;

import java.util.ArrayList;
import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;

/**
* Retrofit官方Demo
* https://github.com/square/retrofit */
public class MainActivity extends AppCompatActivity implements Callback<Tngou> {

ListView listView;
MyAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/**
* 实例化Retrofit
* Converter 转换器 可以转换任意数据类型
*/
Retrofit retrofit =
new Retrofit.Builder().baseUrl("http://www.tngou.net")
.addConverterFactory(GsonConverterFactory.create())
.build();
Service service = retrofit.create(Service.class);
Call<Tngou> call = service.getList("cook",0, 1, 20);
call.enqueue(this);

listView = (ListView) findViewById(R.id.main_list);
adapter = new MyAdapter(this, new ArrayList<Cook>());
listView.setAdapter(adapter);
}

// 异步请求 成功
@Override
public void onResponse(Call<Tngou> call, Response<Tngou> response) {
Toast.makeText(this, "请求成功", Toast.LENGTH_SHORT).show();
List<Cook> list = response.body().getList();
adapter.addAll(list);
}

// 异步请求 失败
@Override
public void onFailure(Call<Tngou> call, Throwable t) {
Toast.makeText(this, "请求失败"+call.request().url(), Toast.LENGTH_SHORT).show();
t.printStackTrace();
}

}

Cook.java:

package com.iwanghang.retrofitdemo;

import com.google.gson.annotations.SerializedName;

/**
* @SerializedName 表示注解
*/
public class Cook {
@SerializedName("id")
private int id;
@SerializedName("name")
private String name;//名称
@SerializedName("food")
private String  food;//食物
@SerializedName("img")
private String img;//图片
@SerializedName("images")
private String images;//图片,
@SerializedName("description")
private String description;//描述
@SerializedName("keywords")
private String keywords;//关键字
@SerializedName("message")
private String message;//资讯内容
@SerializedName("count")
private int count ;//访问次数
@SerializedName("fcount")
private int fcount;//收藏数
@SerializedName("rcount")
private int rcount;//评论读数

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getFood() {
return food;
}

public void setFood(String food) {
this.food = food;
}

public String getImg() {
return img;
}

public void setImg(String img) {
this.img = img;
}

public String getImages() {
return images;
}

public void setImages(String images) {
this.images = images;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

public String getKeywords() {
return keywords;
}

public void setKeywords(String keywords) {
this.keywords = keywords;
}

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

public int getCount() {
return count;
}

public void setCount(int count) {
this.count = count;
}

public int getFcount() {
return fcount;
}

public void setFcount(int fcount) {
this.fcount = fcount;
}

public int getRcount() {
return rcount;
}

public void setRcount(int rcount) {
this.rcount = rcount;
}
}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
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.iwanghang.retrofitdemo.MainActivity">

<ListView
android:id="@+id/main_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>

item.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/item_image"
android:layout_width="70dp"
android:layout_height="70dp" />
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView
android:id="@+id/item_title"
android:textAppearance="@android:style/TextAppearance.Large"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/item_info"
android:maxLines="2"
android:ellipsize="end"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>

转载请注明出处：http://blog.csdn.net/iwanghang/article/details/53172895

项目源码下载：http://download.csdn.net/detail/iwanghang/9683583(免积分)