下滑列表

新建APP类负责全局的上下文类

public class App extends Application {
public static App appcontext;

@Override
public void onCreate() {
    super.onCreate();
    appcontext=this;
}
}

主界面自己搭建，R.layou是下面的界面名

//将数组传给适配器，  ?为LsitView的名字
            ?.setAdapter(new ListAdapter(array));

布局

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.bf.com.myapplication.Activity.TelInfoActivity">
 <ListView
  android:id="@+id/list_tel_select"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
 </ListView>
  </LinearLayout>

单个Item的布局自己定义

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
 <TextView
   android:id="@+id/tv_telinfo_name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"

   android:textSize="20dp"/>
<TextView
    android:id="@+id/tv_telinfo_number"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:layout_alignParentRight="true"
    android:textSize="20dp"/>
</RelativeLayout>

新建一个适配器

public class ListAdapter extends BaseAdapter{
public List<TelInfo> data;
//代表传过来的数组
public ListAdapter(List<TelInfo> data){
    this.data=data;
}
@Override
//数组的长度
public int getCount() {
    return data==null?0:data.size();
}
@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
//对划出去的布局进行复用，进行的优化
public View getView(int position, View convertView, ViewGroup parent) {
    viewholder holder=null;
    if (convertView==null){
        //R.layout.tel_info是单个item对应地址
        convertView= LayoutInflater.from(parent.getContext()).inflate(R.layout.tel_info,null);
        holder=new viewholder(convertView);
        convertView.setTag(holder);
    }else {
        holder= (viewholder) convertView.getTag();
    }
      TelInfo telInfo=data.get(position);
      holder.name.setText(telInfo.getName());
      holder.number.setText(telInfo.getNumber());
    return holder.convertView;
}
public class viewholder{

    public View convertView;
    public   TextView name;
    public   TextView number;
    //对Id进行复用，进行的优化
    public viewholder(View convertView) {
        name = (TextView) convertView.findViewById(R.id.tv_telinfo_name);
        number = (TextView) convertView.findViewById(R.id.tv_telinfo_number);
        this.convertView = convertView;
    }
}
}

有个实例方便数组的各种参数的调用

public class TelInfo {
private  String name;
private  String number;
//要将阐述传送过来
public TelInfo(String name, String number) {

    this.name = name;
    this.number = number;
}

public String getName() {
    return name;
}

public String getNumber() {
    return number;
}

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

public void setNumber(String number) {this.number = number;}

}

一般人们会从数据库读取文件，所以写一个类方便调用

public class DB {
private static final String DB_PATH = "data/data/com.bf.com.myapplication/databases";
private static final String DB_NAME = "commonnum.db";
//代表只调用一次，节省时间
static {   copyDB();  }
//可以将输入流传进来，也可以新建一个Activity来承接
public static void copyDB() {
    InputStream input = null;
    FileOutputStream output = null;
    try {
        //注意要用这个App.appcontext是要新建一个APP类，在后面
        input = App.appcontext.getAssets().open("db/commonnum.db");
        File file = new File(DB_PATH);
        if (!file.exists()) file.mkdirs();
        output = new FileOutputStream(DB_PATH + File.separator + DB_NAME);
        int len = 0;
        byte[] buffer = new byte[1024];
        while ((len = input.read(buffer)) != -1) {
            output.write(buffer, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (output != null) output.close();
            if (input != null) input.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
//将本地数据库的东西传送给实例，并返回一个主界面一个数组，让主界面传个适配器
public static List<TelInfo> readTelInfo(int idx) {
    List<TelInfo> array = new ArrayList<>();
    SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(DB_PATH + "/" + DB_NAME, null);
    Cursor cursor = db.rawQuery("select * from table"+idx+";", null);
    while (cursor.moveToNext()) {
        String name = cursor.getString(cursor.getColumnIndex("name"));
        String number = cursor.getString(cursor.getColumnIndex("number"));
        TelInfo select = new TelInfo(name, number);
        array.add(select);
    }
    cursor.close();
    return array;
}
}