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适配器..........

2019-02-25 20:47:30 作者：互联网

package com.example.adapter;

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import java.util.List;

/**

@Author：tiguan
@E-mail：
@Date：2019/2/21 11:02 AM
@Description：描述信息
*/
public class MyFragmentAdapter extends FragmentPagerAdapter {
private String[] titles;
private List list;

public MyFragmentAdapter(FragmentManager fm, String[] titles, List list) {
super(fm);
this.titles = titles;
this.list = list;
}

@Nullable
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}

@Override
public Fragment getItem(int i) {
return list.get(i);
}

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

package com.example.adapter;

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

import com.bumptech.glide.Glide;
import com.example.bean.News;
import com.example.week2demo.R;

import java.util.List;

/**

@Author：tiguan
@E-mail：
@Date：2019/2/21 11:27 AM
@Description：描述信息
*/
public class MyAdapter extends BaseAdapter {
private List list;
private Context context;

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

@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 int getItemViewType(int position) {
return position % 3;
}

@Override
public int getViewTypeCount() {
return 3;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
switch (getItemViewType(position)) {
case 0:
//第一种
ViewHolder1 holder1;
if (convertView == null) {
convertView = View.inflate(context, R.layout.item_layout1, null);
holder1 = new ViewHolder1();
holder1.img_view1 = convertView.findViewById(R.id.img_view1);
holder1.text_title1 = convertView.findViewById(R.id.text_title1);
holder1.text_info1 = convertView.findViewById(R.id.text_info1);
convertView.setTag(holder1);
} else {
holder1 = (ViewHolder1) convertView.getTag();
}
holder1.text_info1.setText(list.get(position).getNews_summary());
holder1.text_title1.setText(list.get(position).getNews_title());
Glide.with(context).load(list.get(position).getPic_url()).into(holder1.img_view1);
```
         break;
     case 1:
         //第二种
         ViewHolder2 holder2;
         if (convertView == null) {
             convertView = View.inflate(context, R.layout.item_layout2, null);
             holder2 = new ViewHolder2();
             holder2.img_view2 = convertView.findViewById(R.id.img_view2);
             holder2.text_title2 = convertView.findViewById(R.id.text_title2);
             holder2.text_info2 = convertView.findViewById(R.id.text_info2);
             convertView.setTag(holder2);
         } else {
             holder2 = (ViewHolder2) convertView.getTag();
         }
         holder2.text_info2.setText(list.get(position).getNews_summary());
         holder2.text_title2.setText(list.get(position).getNews_title());
         Glide.with(context).load(list.get(position).getPic_url()).into(holder2.img_view2);

         break;
     case 2:
         //第二种
         ViewHolder3 holder3;
         if (convertView == null) {
             convertView = View.inflate(context, R.layout.item_layout3, null);
             holder3 = new ViewHolder3();
             holder3.img_view3 = convertView.findViewById(R.id.img_view3);
             convertView.setTag(holder3);
         } else {
             holder3 = (ViewHolder3) convertView.getTag();
         }
         Glide.with(context).load(list.get(position).getPic_url()).into(holder3.img_view3);

         break;
 }
 return convertView;
```
}

class ViewHolder1 {
private ImageView img_view1;
private TextView text_title1, text_info1;
}

class ViewHolder2 {
private ImageView img_view2;
private TextView text_title2, text_info2;
}

class ViewHolder3 {
private ImageView img_view3;
}
}
=====================================================================
package com.example.helper;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**

@Author：tiguan
@E-mail：
@Date：2019/2/21 11:50 AM
@Description：描述信息
*/
public class MyHelper extends SQLiteOpenHelper {
public MyHelper( Context contextable) {
super(contextable, “bawei.db”, null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
//创建表
db.execSQL(“create table news(title varchar(200),info varchar(500))”);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}
}
=--------------------------------------------=====

package com.example.util;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**

@Author：tiguan
@E-mail：
@Date：2019/2/21 11:17 AM
@Description：描述信息
*/
public class HttpUtil {
//判断网络
public static boolean isNetConnected(Context context) {
if (context != null) {
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if (info != null) {
return info.isConnected();
}
}
return false;
}

//请求数据
public static String getNetData(String dataUrl) {
try {
URL url = new URL(dataUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod(“GET”);
int code = connection.getResponseCode();
if (code == 200) {
InputStream inputStream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder builder = new StringBuilder();
String str = “”;
while ((str = reader.readLine()) != null) {
builder.append(str);
}
return builder.toString();
}
} catch (Exception e) {
e.printStackTrace();
}
return “”;
}
}

标签：text,适配器,list,convertView,position,import,public,..........
来源： https://blog.csdn.net/weixin_44293637/article/details/87924377