接口list

来源：互联网发布：淘宝店铺权重是什么编辑：程序博客网时间：2024/06/09 15:19

备份短信需要在AndroidMainfest.xml中添加权限：

<uses-permission android:name="android.permission.READ_SMS"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.INTERNET"/>

2. 在APP目录下的build.gradle里面添加

compile 'com.google.code.gson:gson:2.4'

3. 先写一个activity main：

<ListView

android:id="@+id/list"

android:layout_width="match_parent"

android:layout_height="match_parent">

</ListView>

写model布局

· model布局为listview列表每一项的布局，是一项的布局，代码如下

· <?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="60dp"

· android:layout_marginLeft="10dp"

· android:orientation="horizontal">

· <ImageView

· android:layout_width="40dp"

· android:layout_height="60dp"

· android:background="@mipmap/ic_launcher"/>

· <LinearLayout

· android:layout_width="match_parent"

· android:layout_height="wrap_content"

· android:orientation="vertical">

· <TextView

· android:id="@+id/tv_name"

· android:layout_width="wrap_content"

· android:layout_height="wrap_content"

· android:text="name"/>

· <TextView

· android:id="@+id/tv_number"

· android:layout_width="wrap_content"

· android:layout_height="wrap_content"

· android:text="number"/>

· </LinearLayout>

再写stu

public class Stu

{

String name;

int age;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

4. 再写StuAdapter

listview 的Adapter如下

public class StuAdapter extends BaseAdapter {

public List<Stu> list;

public Activity activity;

public StuAdapter(List<Stu> list,Activity activity)

{

this.list=list;

this.activity=activity;

}

public void setList(List<Stu> list)

{

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 position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

//数据放到模版中

View view=View.inflate(activity,R.layout.model,null);

TextView textView_name=(TextView) view.findViewById(R.id.tv_name);

TextView textView_age=(TextView) view.findViewById(R.id.tv_number);

//放数据到控件上

textView_age.setText(list.get(position).getAge()+"");

textView_name.setText(list.get(position).getName());

return view;

}

然后MainActivity里面参考如下代码：

package iot.com.jingjizhaopin;

import android.content.SharedPreferences;

import android.os.Handler;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.widget.ListView;

import android.widget.Toast;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import org.json.JSONObject;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.List;

public class MainActivity extends AppCompatActivity {

List<Stu> stulist=null;

ListView listView;

//设置一个handler，接受子线程传回UI线程的内容

Handler handler = new Handler(){

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

switch (msg.what)

{

case 200:

//完成数据绑定

if(stulist!=null)

{

//绑定数据

StuAdapter stuAdapter=new StuAdapter(stulist,MainActivity.this);

listView.setAdapter(stuAdapter);

}

break;

case -1:

//获取失败

Toast.makeText(MainActivity.this,"获取失败",Toast.LENGTH_SHORT).show();

break;

case -2:

//获取发生异常

Toast.makeText(MainActivity.this,"获取发生异常",Toast.LENGTH_SHORT).show();

break;

default:

//其他情况

Toast.makeText(MainActivity.this,"获取发生异常",Toast.LENGTH_SHORT).show();

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

listView=(ListView)findViewById(R.id.list);

//从缓存获取数据,获取成功返回true，则绑定本地数据，否则从服务器获取数据

if(getDataFromCache())

{

//绑定数据

StuAdapter stuAdapter=new StuAdapter(stulist,MainActivity.this);

listView.setAdapter(stuAdapter);

}

else

{

//从服务器获取数据

getDataFromService();

}

//这个方法会返回一个判断值，如果在缓存获取成功，则返回true，并且将内容放到stulist里面，否则返回FALSE

private boolean getDataFromCache()

{

try {

//打开缓存文件『person』

SharedPreferences sp = MainActivity.this.getSharedPreferences("person", MODE_PRIVATE);

//获取字段为『studata』的数据

String data = sp.getString("studata",""); //所有信息

JSONObject jsonObject=new JSONObject(data);

String Data= jsonObject.getString("data");

//如果获取到了data，则解析它并且将值放到stulist里面

if (data !="") {

Gson gson = new Gson();

stulist = gson.fromJson(Data,new TypeToken<List<Stu>>() {

}.getType());

//暂时没有添加时间过期的判断

return true;

} else {

stulist=null;

return false;

}

}catch (Exception ex)

{

ex.printStackTrace();

stulist=null;

return false;

}

private void getDataFromService()

{

final String path="http://10.10.192.1/stumanage/2.php";

//开线程

new Thread(){

@Override

public void run() {

super.run();

//获取数据

try {

URL url = new URL(path);

HttpURLConnection conn=(HttpURLConnection)url.openConnection();

conn.setRequestMethod("GET"); //必须大写

conn.setConnectTimeout(5000);

Log.d("JHH","try");

int code=conn.getResponseCode();

if(code==200)

{

Log.d("JHH","code:200 ");

//请求成功

InputStream inputStream=conn.getInputStream();

//然后把输入流转为字符串。上网找一个把流转为字符串的函数

String abc=inputstream2string(inputStream);

//解析json字符串

//先拿到code。判断code是否等于200

// {"code":200,"pageindex":10,"isover":1,"data":[{"name":"\u5f20\u5b8f90","age":91},{"name":"\u5f20\u5b8f91","age":92},{"name":"\u5f20\u5b8f92","age":93},{"name":"\u5f20\u5b8f93","age":94},{"name":"\u5f20\u5b8f94","age":95},{"name":"\u5f20\u5b8f95","age":96},{"name":"\u5f20\u5b8f96","age":97},{"name":"\u5f20\u5b8f97","age":98},{"name":"\u5f20\u5b8f98","age":99},{"name":"\u5f20\u5b8f99","age":100}]}

JSONObject jsonObject=new JSONObject(abc);

if(jsonObject.getString("code").equals("200"))

{

//如果等于200。服务器数据有效的

String Data= jsonObject.getString("data");

Gson gson=new Gson();

//studata=[{"name":"\u5f20\u5b8f90","age":91}，。。。。]

stulist = gson.fromJson(Data,new TypeToken<List<Stu>>(){}.getType());

//程序如果走到这个位置。说明数据符合json格式。这时候我要把数据使用sharedpreference保存起来

//android内存缓存

SharedPreferences sp=getSharedPreferences("person",MODE_PRIVATE);//person是文件名.

SharedPreferences.Editor editor=sp.edit();

editor.putString("studata",abc);//按照关键字studata。把字符串保存起来

editor.apply();

Log.d("JHH","获取数据成功");

Message message=new Message();

message.what=200;//200代码获取数据正常

handler.sendMessage(message);

Log.d("JHH","向主线程发送消息");

}

else

{

//返回码不是200的情况

Message message=new Message();

message.obj=abc; //定义带有数据的消息

message.what=202;//200代码获取数据正常

handler.sendMessage(message);

Log.d("JHH","发送消息正常");

}

else

{

//请求失败

Message message=new Message();

message.what=-1;//-1 代码获取数据失败

handler.sendMessage(message);

Log.d("JHH","请求失败");

}

catch (Exception ex)

{

Message message=new Message();

message.what=-2;//-1 代码获取数据时发生异常情况

//发送消息

handler.sendMessage(message);

Log.d("JHH","Exception");

}

}.start();

}

//把字节流转换成字符串，这个可以直接拿来用

private String inputstream2string(InputStream inputStream)

{

try {

ByteArrayOutputStream baos=new ByteArrayOutputStream();

int length=0;

byte[] buffer=new byte[1024];

while((length=inputStream.read(buffer))!=-1){

baos.write(buffer, 0, length);

}

inputStream.close();

baos.close();

return baos.toString();

} catch (Exception e) {

e.printStackTrace();

return "获取失败";

}

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