Android中ListView使用示例介绍 Android中ListView使用示例介绍

一、具体思路

1、创建Listview控件
3、写入
4、读取
5、创建对象，构造器，GETSET方法

二、具体实施

1、适配器
2、数据库
3、对象
4、等等等等

三、案例分享

activity_main.xml
listitem.xml
MyDatabaseHelper.java
MainActivity.java
Employee.java

简单ListView实例

数据库读取数据存入ListView

一、具体思路
1、创建Listview控件
2、创建子布局
创建数据库
主方法调用数据库继承类且初始化数据库，写入数据
? MyDatabaseHelper databaseHelper = new MyDatabaseHelper(this,"Co.db",null,1); ?
SQLiteDatabase db = databaseHelper.getWritableDatabase(); ?
SQLiteDatabase db2 = databaseHelper.getReadableDatabase();

3、写入

ContentValues values = new ContentValues(); values.put("Code","1"); values.put("Name","Admin"); values.put("Post","32"); values.put("Tel","123456789"); db.insert("employee",null,values); values.clear(); values.put("Code","2"); values.put("Name","Admin1"); values.put("Post","22"); values.put("Tel","23342e"); db.insert("employee",null,values);

4、读取

Cursor cursor = db2.query("Employee",null,null,null,null,null,null); arrayList = new ArrayList<>(); if (cursor.moveToFirst()) {do {name = cursor.getString(cursor.getColumnIndex("Name")); code = cursor.getString(cursor.getColumnIndex("Code")); post = cursor.getString(cursor.getColumnIndex("Post")); tel = cursor.getString(cursor.getColumnIndex("Tel")); System.out.println("查找到的值:"+ name +"---"+ code +"---"+ post +"---"+ tel); Employee employee=new Employee(name, tel, post, code); arrayList.add(employee); }while (cursor.moveToNext()); }

5、创建对象，构造器，GETSET方法
6、创建Adapter

二、具体实施
1、适配器

lv.setAdapter(new BaseAdapter() {@Overridepublic int getCount() {return arrayList.size(); }@Overridepublic Object getItem(int position) {return null; }@Overridepublic long getItemId(int position) {return 0; }@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view; if (convertView==null){view=View.inflate(getBaseContext(),R.layout.listitem,null); }else{view=convertView; }Employee ee=(Employee) arrayList.get(position); TextView eename=view.findViewById(R.id.name); TextView eedianhua=view.findViewById(R.id.dianhua); TextView eezhiwei=view.findViewById(R.id.zhiwei); TextView eekahao=view.findViewById(R.id.kahao); eename.setText(ee.getName()); eedianhua.setText(ee.getTel()); eezhiwei.setText(ee.getPost()); eekahao.setText(ee.getCode()); return view; }});

2、数据库

public class MyDatabaseHelper extends SQLiteOpenHelper {public static final String CREATE_Employees = "create table employee ("+ "Code text, "+ "Name text unique, "+ "Post text, "+ "Tel text)"; private Context mContext; public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactoryfactory, int version) {super(context, name, factory, version); mContext = context; }@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL(CREATE_Employees); Toast.makeText(mContext, "Create succeeded", Toast.LENGTH_SHORT).show(); }@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}}

3、对象

package com.example.a4_7_1_lv; public class Employee {private String name; private String tel; private String post; private String code; public String getName() {return name; }public void setName(String name) {this.name = name; }public String getTel() {return tel; }public void setTel(String tel) {this.tel = tel; }public String getPost() {return post; }public void setPost(String post) {this.post = post; }public String getCode() {return code; }public void setCode(String code) {this.code = code; }public Employee(String name, String tel, String post, String code) {this.name = name; this.tel = tel; this.post = post; this.code = code; }public Employee() {}}

4、等等等等

三、案例分享
activity_main.xml

listitem.xml

MyDatabaseHelper.java

package com.example.a4_7_1_lv; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.widget.Toast; public class MyDatabaseHelper extends SQLiteOpenHelper {public static final String CREATE_Employees = "create table employee ("+ "Code text, "+ "Name text unique, "+ "Post text, "+ "Tel text)"; private Context mContext; public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactoryfactory, int version) {super(context, name, factory, version); mContext = context; }@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL(CREATE_Employees); Toast.makeText(mContext, "Create succeeded", Toast.LENGTH_SHORT).show(); }@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}}

MainActivity.java

package com.example.a4_7_1_lv; import androidx.appcompat.app.AppCompatActivity; import android.content.ContentValues; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity {private ListView lv; private MyDatabaseHelper databaseHelper; private SQLiteDatabase db; private SQLiteDatabase db2; private ArrayList arrayList; private String name; private String code; private String post; private String tel; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv = findViewById(R.id.list); }@Overrideprotected void onStart() {super.onStart(); MyDatabaseHelper databaseHelper = new MyDatabaseHelper(this,"Co.db",null,1); db = databaseHelper.getWritableDatabase(); db2 = databaseHelper.getReadableDatabase(); DBInsert(); Cursor cursor = db2.query("Employee",null,null,null,null,null,null); arrayList = new ArrayList<>(); if (cursor.moveToFirst()) {do {name = cursor.getString(cursor.getColumnIndex("Name")); code = cursor.getString(cursor.getColumnIndex("Code")); post = cursor.getString(cursor.getColumnIndex("Post")); tel = cursor.getString(cursor.getColumnIndex("Tel")); System.out.println("查找到的值:"+ name +"---"+ code +"---"+ post +"---"+ tel); Employee employee=new Employee(name, tel, post, code); arrayList.add(employee); }while (cursor.moveToNext()); }lv.setAdapter(new BaseAdapter() {@Overridepublic int getCount() {return arrayList.size(); }@Overridepublic Object getItem(int position) {return null; }@Overridepublic long getItemId(int position) {return 0; }@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view; if (convertView==null){view=View.inflate(getBaseContext(),R.layout.listitem,null); }else{view=convertView; }Employee ee=(Employee) arrayList.get(position); TextView eename=view.findViewById(R.id.name); TextView eedianhua=view.findViewById(R.id.dianhua); TextView eezhiwei=view.findViewById(R.id.zhiwei); TextView eekahao=view.findViewById(R.id.kahao); eename.setText(ee.getName()); eedianhua.setText(ee.getTel()); eezhiwei.setText(ee.getPost()); eekahao.setText(ee.getCode()); return view; }}); }private void DBInsert() {ContentValues values = new ContentValues(); values.put("Code","1"); values.put("Name","Admin"); values.put("Post","32"); values.put("Tel","123456789"); db.insert("employee",null,values); values.clear(); values.put("Code","2"); values.put("Name","Admin1"); values.put("Post","22"); values.put("Tel","23342e"); db.insert("employee",null,values); values.clear(); values.put("Code","4"); values.put("Name","Admin13"); values.put("Post","2sda2"); values.put("Tel","233asd42e"); db.insert("employee",null,values); values.clear(); values.put("Code","Code"); values.put("Name","Name"); values.put("Post","Post"); values.put("Tel","Tel"); db.insert("employee",null,values); }}

Employee.java

package com.example.a4_7_1_lv; import androidx.appcompat.app.AppCompatActivity; import android.content.ContentValues; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity {private ListView lv; private MyDatabaseHelper databaseHelper; private SQLiteDatabase db; private SQLiteDatabase db2; private ArrayList arrayList; private String name; private String code; private String post; private String tel; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv = findViewById(R.id.list); }@Overrideprotected void onStart() {super.onStart(); MyDatabaseHelper databaseHelper = new MyDatabaseHelper(this,"Co.db",null,1); db = databaseHelper.getWritableDatabase(); db2 = databaseHelper.getReadableDatabase(); DBInsert(); Cursor cursor = db2.query("Employee",null,null,null,null,null,null); arrayList = new ArrayList<>(); if (cursor.moveToFirst()) {do {name = cursor.getString(cursor.getColumnIndex("Name")); code = cursor.getString(cursor.getColumnIndex("Code")); post = cursor.getString(cursor.getColumnIndex("Post")); tel = cursor.getString(cursor.getColumnIndex("Tel")); System.out.println("查找到的值:"+ name +"---"+ code +"---"+ post +"---"+ tel); Employee employee=new Employee(name, tel, post, code); arrayList.add(employee); }while (cursor.moveToNext()); }lv.setAdapter(new BaseAdapter() {@Overridepublic int getCount() {return arrayList.size(); }@Overridepublic Object getItem(int position) {return null; }@Overridepublic long getItemId(int position) {return 0; }@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view; if (convertView==null){view=View.inflate(getBaseContext(),R.layout.listitem,null); }else{view=convertView; }Employee ee=(Employee) arrayList.get(position); TextView eename=view.findViewById(R.id.name); TextView eedianhua=view.findViewById(R.id.dianhua); TextView eezhiwei=view.findViewById(R.id.zhiwei); TextView eekahao=view.findViewById(R.id.kahao); eename.setText(ee.getName()); eedianhua.setText(ee.getTel()); eezhiwei.setText(ee.getPost()); eekahao.setText(ee.getCode()); return view; }}); }private void DBInsert() {ContentValues values = new ContentValues(); values.put("Code","1"); values.put("Name","Admin"); values.put("Post","32"); values.put("Tel","123456789"); db.insert("employee",null,values); values.clear(); values.put("Code","2"); values.put("Name","Admin1"); values.put("Post","22"); values.put("Tel","23342e"); db.insert("employee",null,values); values.clear(); values.put("Code","4"); values.put("Name","Admin13"); values.put("Post","2sda2"); values.put("Tel","233asd42e"); db.insert("employee",null,values); values.clear(); values.put("Code","Code"); values.put("Name","Name"); values.put("Post","Post"); values.put("Tel","Tel"); db.insert("employee",null,values); }}

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