android SQlite结合SimpleCursorAdapter的简单使用

SQLite类：

package com.example.cuboo.mytest;

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

/**
* Created by cuboo on 2016/8/12.
*/
public class mysqlite extends SQLiteOpenHelper {
public mysqlite(Context context,String name,int version) {
super(context, name, null,version);
}

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("create table user( _id integer primary key autoincrement,name,age)");
}

@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

}
}


调用：
package com.example.cuboo.mytest;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private EditText ev_name, ev_age, ev_query;
private Button btn_add, btn_query, btn_queryall;
private ListView lv_query;
private SimpleCursorAdapter adapter;
private mysqlite dp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ev_name = (EditText) findViewById(R.id.ev_name);
ev_age = (EditText) findViewById(R.id.ev_age);
ev_query = (EditText) findViewById(R.id.ev_query);
btn_add = (Button) findViewById(R.id.btn_add);
btn_query = (Button) findViewById(R.id.btn_query);
btn_queryall = (Button) findViewById(R.id.btn_queryall);
lv_query = (ListView) findViewById(R.id.lv_query);

// 创建数据库
dp = new mysqlite(this, "user", 1);

btn_add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = ev_name.getText().toString();
int age = Integer.parseInt(ev_age.getText().toString());
insert(name, age);
}
});

btn_query.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
query(ev_query.getText().toString());
}
});

btn_queryall.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
queryall();
}
});
}

private void insert(String name, int age) {//插入
SQLiteDatabase dbwriter = dp.getWritableDatabase();

ContentValues values = new ContentValues();
values.put("name", name);
values.put("age", age);
dbwriter.insert("user", null, values);
System.out.println(age);

dbwriter.close();
}

private void query(String name) { //查询
SQLiteDatabase dbreader = dp.getReadableDatabase();
Cursor cursor = dbreader
.query("user", new String[] { "_id", "name", "age" },
"name like ?", new String[] { name }, null, null, null);
adapter = new SimpleCursorAdapter(this, R.layout.list_aty, cursor,
new String[] { "name", "age" }, new int[] { R.id.tv_name,
R.id.tv_age });
lv_query.setAdapter(adapter);
dbreader.close();
}

private void queryall() {//查询全部
SQLiteDatabase dbreader = dp.getReadableDatabase();
Cursor cursor = dbreader.query("user", null, null, null, null, null,
null);

adapter = new SimpleCursorAdapter(this, R.layout.list_aty, cursor,
new String[] { "name", "age" }, new int[] { R.id.tv_name,
R.id.tv_age });
lv_query.setAdapter(adapter);
dbreader.close();
}
}