Android Studio学习路程（12）

丈夫志四海，万里犹比邻。这篇文章主要讲述Android Studio学习路程（12）相关的知识，希望能为你提供帮助。
今天学习了一个控件：ListView

package com.example.hp.listview.Activity; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.widget.ListView; import com.example.hp.listview.R; import com.example.hp.listview.adapter.MyAdapter; import com.example.hp.listview.bean.Student; import java.util.ArrayList; import java.util.List; public class MainActivity extends ActionBarActivity {private ListView mListView; private List< Student> mStudents; private MyAdapter mMyAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化UI initUI(); //初始化数据集 initData(); } private void initData() { mStudents = new ArrayList< > (); for(int i=0; i< 100; i++){ mStudents.add(new Student(i, "学生" + i, "描述信息" + i)); } //实例化一个适配器 mMyAdapter = new MyAdapter(mStudents,getApplicationContext()); //设置构造器 mListView.setAdapter(mMyAdapter); }private void initUI() { mListView = (ListView) findViewById(R.id.list_view); } }

< ?xml version="1.0" encoding="utf-8"?> < 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" tools:context=".Activity.MainActivity"> < ListView android:id="@+id/list_view" android:layout_width="match_parent" android:layout_height="match_parent" /> < /LinearLayout>

package com.example.hp.listview.adapter; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import com.example.hp.listview.R; import com.example.hp.listview.bean.Student; import java.util.List; /** * Created by hp on 2020/3/1. */ public class MyAdapter extends BaseAdapter {private final List< Student> mStudents; private final Context context; private TextView name; private TextView des; public MyAdapter(List< Student> students, Context context) { mStudents = students; this.context = context; }@Override public int getCount() { return mStudents.size(); }@Override public Object getItem(int i) { return mStudents.get(i); }@Override public long getItemId(int i) { return mStudents.get(i).getId(); }@Override public View getView(int i, View view, ViewGroup viewGroup) { if(view==null){ view=View.inflate(context, R.layout.item_list,null); } //将数据集合设置到每一个条目中 name = (TextView) view.findViewById(R.id.tv_name); des = (TextView) view.findViewById(R.id.tv_des); //设置姓名 name.setText(mStudents.get(i).getName()); //设置描述信息 des.setText(mStudents.get(i).getDes()); return view; } }

package com.example.hp.listview.bean; /** * Created by hp on 2020/3/1. */ public class Student { private int id; //学生的id private String name; //姓名 private String des; //描述public Student(int id, String name, String des) { this.id = id; this.name = name; this.des = des; }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 getDes() { return des; }public void setDes(String des) { this.des = des; } }

< ?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:padding="8dp" android:layout_height="wrap_content"> < TextView android:id="@+id/tv_name" android:textSize="24sp" android:text="姓名" android:textColor="@android:color/holo_red_light" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content"/> < TextView android:id="@+id/tv_des" android:textSize="24sp" android:text="描述信息" android:textColor="@android:color/holo_blue_bright" android:layout_weight="2" android:layout_width="0dp" android:layout_height="wrap_content"/> < /LinearLayout>

下面是运行的结果截图：