android-studio SQL数据库
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了android-studio SQL数据库，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含9078字，纯文字阅读大概需要13分钟。
内容图文
activity-main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_marginTop="8dp"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/addLL"
android:orientation="horizontal"
>
<EditText
android:id="@+id/nameET"
android:layout_weight="1"
android:hint="商品名称"
android:inputType="textPersonName"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/balanceET"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="商品金额"
android:inputType="number"
/>
<ImageView
android:onClick="add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/addIV"
android:src="@android:mipmap/sym_def_app_icon"
/>
</LinearLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/accountLV"
></ListView>
</LinearLayout>
item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="10dp"
>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="@+id/idTV"
android:text="13"
android:textColor="#000000"
android:textSize="20sp"
/>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:id="@+id/nameTV"
android:singleLine="true"
android:text="PQ"
android:textSize="20sp"
android:textColor="#000000"
/>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:id="@+id/balanceTV"
android:singleLine="true"
android:text="12345"
android:textSize="20sp"
android:textColor="#000000"
/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/upIV"
android:layout_marginBottom="2dp"
android:src="@android:drawable/ic_input_add"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/downIV"
android:layout_marginBottom="2dp"
android:src="@android:drawable/button_onoff_indicator_on"
/>
</LinearLayout>
<ImageView
android:id="@+id/deleteIV"
android:layout_width="25dp"
android:layout_height="25dp"
android:src="@android:drawable/ic_menu_delete"
/>
</LinearLayout>
MainActivity.java
package com.example.sqlite;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private List<Account> list;
private AccountDao dao;
private EditText nameET;
private EditText balanceET;
private MyAdapter adapter;
private ListView accountLV;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
dao=new AccountDao(this);
list=dao.queryAll();
adapter=new MyAdapter();
accountLV.setAdapter(adapter);
}
private void initView() {
accountLV=(ListView)findViewById(R.id.accountLV);
nameET=(EditText)findViewById(R.id.nameET);
balanceET=(EditText)findViewById(R.id.balanceET);
accountLV.setOnItemClickListener(new MyOnItemClickListener());
}
public void add(){
String name=nameET.getText().toString().trim();
String balance=balanceET.getText().toString().trim();
Account a=new Account(name,balance.equals("")?0:Integer.parseInt(balance));
dao.insert(a);
list.add(a);
adapter.notifyDataSetChanged();
accountLV.setSelection(accountLV.getCount()-1);
nameET.setText("");
balanceET.setText("");
}
private class MyAdapter extends BaseAdapter{
public int getCount(){
return list.size();
}
public Object getItem(int position){
return list.get(position);
}
public long getItemId(int position){
return position;
}
@Override
public View getView(int position, View converview, ViewGroup partent) {
View item=converview!=null?converview:View.inflate(getApplicationContext(),R.layout.item,null);
TextView idTV=(TextView)findViewById(R.id.idTV);
TextView nameTV=(TextView)findViewById(R.id.nameTV);
TextView balanceTV=(TextView)findViewById(R.id.balanceTV);
final Account a=list.get(position);
idTV.setText(a.getId()+"");
nameTV.setText(a.getName());
balanceTV.setText(a.getBalance()+"");
ImageView upIV=(ImageView)findViewById(R.id.upIV);
ImageView downIV=(ImageView)findViewById(R.id.downIV);
ImageView deleteIV=(ImageView)findViewById(R.id.deleteIV);
upIV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
a.setBalance(a.getBalance()+1);
notifyDataSetChanged();
dao.update(a);
}
});
downIV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
a.setBalance(a.getBalance()-1);
notifyDataSetChanged();
dao.update(a);
}
});
deleteIV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
android.content.DialogInterface.OnClickListener listener=new android.content.DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialogInterface,int which){
list.remove(a);
dao.delete(a.getId());
notifyDataSetChanged();
}
};
AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
builder.setTitle("确定要删除吗？");
builder.setPositiveButton("确定",listener);
builder.setPositiveButton("取消",null);
builder.show();
}
});
return item;
}
}
private class MyOnItemClickListener implements android.widget.AdapterView.OnItemClickListener {
public void onItemClick(AdapterView<?>parent,View view,int position,long id){
Account a=(Account)parent.getItemAtPosition(position);
Toast.makeText(getApplicationContext(),a.toString(),Toast.LENGTH_SHORT).show();
}
}
}
MyHelper.java
package com.example.sqlite;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class MyHelper extends SQLiteOpenHelper {
public MyHelper(Context context){
super(context,"itcasr.db",null,2);
}
public void onCreate(SQLiteDatabase db){
System.out.println("onCreate");
db.execSQL("CREATE TABLE account(_id INTEGER PRIMARY KEY AUTOINCREMENT,name VARCHAR(20),balance INTEGER )");
}
public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion){
System.out.println("onUpgrade");
}
}
AccountDao.java
package com.example.sqlite;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import java.util.ArrayList;
import java.util.List;
public class AccountDao {
private MyHelper helper;
public AccountDao(Context context){
helper=new MyHelper(context);
}
public void insert(Account account){
SQLiteDatabase db=helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("name",account.getName());
values.put("balance",account.getBalance());
long id=db.insert("account",null,values);
account.setId(id);
db.close();
}
public int delete(long id){
SQLiteDatabase db=helper.getWritableDatabase();
int count=db.delete("account","_id=?",new String[]{id+""});
db.close();
return count;
}
public int update(Account account){
SQLiteDatabase db=helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("name",account.getName());
values.put("account",account.getBalance());
int count=db.update("account",values,"_id=?",new String[]{account.getId()+""});
db.close();
return count;
}
public List<Account>queryAll(){
SQLiteDatabase db=helper.getWritableDatabase();
Cursor c=db.query("account",null,null,null,null,null,"balance DESC");
List<Account> list=new ArrayList<Account>();
while (c.moveToNext()){
long id=c.getLong(c.getColumnIndex("_id"));
String name=c.getString(1);
int balance=c.getInt(2);
list.add(new Account(id,name,balance));
}
c.close();
db.close();
return list;
}
}
Account.java
package com.example.sqlite;
public class Account {
private Long id;
private String name;
private Integer balance;
public Long getId(){
return id;
}
public void setId(Long id){
this.id=id;
}
public String getName(){
return name;
}
public void setName(String name){
this.name=name;
}
public Integer getBalance(){
return balance;
}
public void setBalance(Integer balance){
this.balance=balance;
}
public Account(Long id,String name,Integer balance){
super();
this.id=id;
this.name=name;
this.balance=balance;
}
public Account(String name,Integer balance){
super();
this.name=name;
this.balance=balance;
}
public Account(){
super();
}
public String toString(){
return "[序号："+id+",商品名称："+name+",商品金额："+balance+"]";
}
}
内容总结
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