1，Main_activity的xmL配置
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_width="match_parent"
4 android:layout_height="match_parent"
5 android:background="@drawable/b3"
6 android:orientation="vertical"
7 tools:context="${relativePackage}.${activityClass}" >
8
9 <TextView
10 android:layout_width="match_parent"
11 android:layout_height="15dp"
12 android:background="#56a692"
13 android:gravity="bottom"
14 android:text="@string/main_name1"
15 android:textColor="#fff"
16 android:textSize="12sp" />
17
18 <TextView
19 android:layout_width="match_parent"
20 android:layout_height="80dp"
21 android:gravity="center"
22 android:text="@string/main_name1"
23 android:textSize="20sp"
24 android:textStyle="italic" />
25
26 <TextView
27 android:layout_width="match_parent"
28 android:layout_height="38dp"
29 android:background="#CD661D" />
30
31 <TextView
32 android:layout_width="match_parent"
33 android:layout_height="30dp"
34 android:text="@string/main_name6"
35 android:textSize="15sp"
36 android:textStyle="italic" />
37
38 <EditText
39 android:id="@+id/editText1"
40 android:layout_width="match_parent"
41 android:layout_height="wrap_content"
42 android:layout_marginTop="15dp"
43 android:ems="10"
44 android:hint="@string/main_name2" >
45
46 <requestFocus />
47 </EditText>
48
49 <EditText
50 android:id="@+id/editText2"
51 android:layout_width="match_parent"
52 android:layout_height="wrap_content"
53 android:layout_marginTop="34dp"
54 android:ems="10"
55 android:hint="@string/main_name3" />
56
57 <TextView
58 android:layout_width="match_parent"
59 android:layout_height="60dp"
60 android:layout_weight="0.00" />
61
62 <TextView
63 android:layout_width="match_parent"
64 android:layout_height="38dp"
65 android:background="#CD661D" />
66
67 <LinearLayout
68 android:layout_width="wrap_content"
69 android:layout_height="wrap_content"
70 android:layout_weight="0.31"
71 android:orientation="horizontal" >
72
73 <Button
74 android:id="@+id/button1"
75 android:layout_width="155dp"
76 android:layout_height="wrap_content"
77 android:text="@string/main_name4" />
78
79 <Button
80 android:id="@+id/button2"
81 android:layout_width="164dp"
82 android:layout_height="wrap_content"
83 android:text="@string/main_name5" />
84 </LinearLayout>
85
86 <TextView
87 android:layout_width="match_parent"
88 android:layout_height="50dp"
89 android:background="#EECFA1" />
90
91 </LinearLayout>
2，Register_activity 的XML配置
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_width="match_parent"
4 android:layout_height="match_parent"
5 android:background="@drawable/b1"
6 android:orientation="vertical"
7 tools:context="${relativePackage}.${activityClass}" >
8
9 <TextView
10 android:layout_width="match_parent"
11 android:layout_height="15dp"
12 android:background="#56a692"
13 android:gravity="bottom"
14 android:text="@string/register_name"
15 android:textColor="#fff"
16 android:textSize="12sp" />
17
18 <TextView
19 android:layout_width="match_parent"
20 android:layout_height="wrap_content"
21 android:gravity="center"
22 android:text="@string/register_name6"
23 android:textColor="#B22222"
24 android:textSize="20sp"
25 android:textStyle="italic" />
26
27 <TextView
28 android:layout_width="wrap_content"
29 android:layout_height="100dp"
30 android:gravity="bottom" />
31
32 <TextView
33 android:layout_width="match_parent"
34 android:layout_height="wrap_content"
35 android:background="#B2DFEE"
36 android:gravity="bottom"
37 android:text="@string/register_name7"
38 android:textStyle="italic" />
39
40 <EditText
41 android:id="@+id/etid"
42 android:layout_width="match_parent"
43 android:layout_height="wrap_content"
44 android:ems="10"
45 android:hint="@string/register_name2" >
46
47 <requestFocus />
48 </EditText>
49
50 <TextView
51 android:layout_width="match_parent"
52 android:layout_height="wrap_content"
53 android:gravity="center"
54 android:textColor="#B22222"
55 android:textSize="20sp"
56 android:textStyle="italic" />
57
58 <EditText
59 android:id="@+id/etname"
60 android:layout_width="match_parent"
61 android:layout_height="wrap_content"
62 android:ems="10"
63 android:hint="@string/register_name3" />
64
65 <TextView
66 android:layout_width="match_parent"
67 android:layout_height="wrap_content"
68 android:background="#B2DFEE"
69 android:gravity="center"
70 android:textColor="#B22222"
71 android:textSize="20sp"
72 android:textStyle="italic" />
73
74 <LinearLayout
75 android:layout_width="wrap_content"
76 android:layout_height="0dp"
77 android:layout_weight="0.84"
78 android:orientation="horizontal" >
79
80 <Button
81 android:id="@+id/btn_qu"
82 android:layout_width="155dp"
83 android:layout_height="wrap_content"
84 android:text="@string/register_name4" />
85
86 <Button
87 android:id="@+id/btn_sure"
88 android:layout_width="163dp"
89 android:layout_height="wrap_content"
90 android:text="@string/register_name5" />
91 </LinearLayout>
92
93 <TextView
94 android:layout_width="match_parent"
95 android:layout_height="50dp"
96 android:background="#EECFA1" />
97
98 </LinearLayout>
3，SQLite的配置创建数据库和表
例如：新建类sqliteopenhelper
package com.example.dbtest;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
//新建类Sqliteopenhelper 继承于SQLiteOpenHelper
public class Sqliteopenhelper extends SQLiteOpenHelper {
//数据库名：
private static final String DBNAME="test.db";
//表名
private static final String TABLENAME="student";
private static final String GOODSNAME="goods";
//版本号：具体我也不知道是什么，照着写就行了
private static final int TESTVERSION=1;
public Sqliteopenhelper(Context context) {
super(context, DBNAME, null, TESTVERSION);
// TODO Auto-generated constructor stub
}
//初始化，创建表
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String sql1="create table"+" "+TABLENAME+"(id varchar,name varchar)";
String sql2="create table"+" "+GOODSNAME+"(LF varchar,name varchar,miaoshu varchar)";
db.execSQL(sql1);
db.execSQL(sql2);
}
//失败后删除，重新创建
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
if(newVersion>oldVersion)
{
String sql1="drop table if exists"+TABLENAME;
String sql2="drop table if exists"+GOODSNAME;
db.execSQL(sql1);
db.execSQL(sql2);
this.onCreate(db);
}
}
}
4，Main_activity.java 调用并且实现验证数据库内信息
1 package com.example.dbtest;
2
3 import android.app.Activity;
4 import android.app.AlertDialog;
5 import android.app.AlertDialog.Builder;
6 import android.content.DialogInterface;
7 import android.content.Intent;
8 import android.database.Cursor;
9 import android.database.sqlite.SQLiteDatabase;
10 import android.database.sqlite.SQLiteException;
11 import android.database.sqlite.SQLiteOpenHelper;
12 import android.os.Bundle;
13 import android.view.View;
14 import android.view.View.OnClickListener;
15 import android.widget.Button;
16 import android.widget.EditText;
17 import android.widget.Toast;
18
19 public class MainActivity extends Activity {
20
21 private EditText et_id, et_name;
22 private Button btn_test, btn_local;
23 //1,SQLite的声明
24 SQLiteOpenHelper helper;
25 private String _id;
26 private String _name;
27
28 @Override
29 protected void onCreate(Bundle savedInstanceState) {
30 super.onCreate(savedInstanceState);
31 setContentView(R.layout.activity_main);
32 // 2，数据库的创建，及调用
33 helper = new Sqliteopenhelper(this);
34 helper.getWritableDatabase();
35
36 et_id = (EditText) findViewById(R.id.editText1);
37 et_name = (EditText) findViewById(R.id.editText2);
38 btn_test = (Button) findViewById(R.id.button1);
39 btn_local = (Button) findViewById(R.id.button2);
40
41 btn_test.setOnClickListener(new testListener());
42 btn_local.setOnClickListener(new localListener());
43
44 }
45
46 class testListener implements OnClickListener {
47
48 @Override
49 public void onClick(View v) {
50 // TODO Auto-generated method stub
51 Intent intent = new Intent(MainActivity.this, Register.class);
52 startActivity(intent);
53 }
54
55 }
56 //登陆按钮
57
58 class localListener implements OnClickListener {
59
60 @Override
61 public void onClick(View v) {
62 // TODO Auto-generated method stub
63 _id = et_id.getText().toString();
64 _name = et_name.getText().toString();
65 if (_name.equals("") || _id.equals("")) { Toast.makeText(getApplicationContext(), "请输入账号密 码！",Toast.LENGTH_SHORT).show();
66 } else {
67 sureuser(_id, _name);
68 }
69 }
70
71 }
72
73 private void sureuser(String userid, String username) {
74 //3,数据库的操作，查询
75 SQLiteDatabase sdb = helper.getReadableDatabase();
76 try {
77 String sql = "select * from student where id=? and name=?";
78 // 实现遍历id和name
79 Cursor cursor = sdb.rawQuery(sql, new String[] { _id, _name });
80 if (cursor.getCount() > 0) {
81 Intent intent = new Intent(MainActivity.this, User.class);
82 Bundle bundle = new Bundle();
83 bundle.putString("name", _name);
84 intent.putExtras(bundle);
85 startActivity(intent);
86 } else {
87 Toast.makeText(getApplicationContext(), "登录失败",
88 Toast.LENGTH_SHORT).show();
89 }
90 cursor.close();
91 sdb.close();
92 } catch (SQLiteException e) {
93 oast.makeText(getApplicationContext(), "亲，请注册！",
94 Toast.LENGTH_SHORT).show();
95 }
96 }
97
98
99
100
101 }
5，Register_activity.java
package com.example.dbtest;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Register extends Activity {
private EditText etid,etname;
private Button btn_qu,btn_sure;
SQLiteOpenHelper helper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
helper=new Sqliteopenhelper(this);
helper.getWritableDatabase();
etid=(EditText)findViewById(R.id.etid);
etname=(EditText)findViewById(R.id.etname);
btn_qu=(Button)findViewById(R.id.btn_qu);
btn_sure=(Button)findViewById(R.id.btn_sure);
btn_sure.setOnClickListener(new sureListener());
btn_qu.setOnClickListener(new quListener());
}
class sureListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try{
SQLiteDatabase sdb=helper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put("id",etid.getText().toString());
values.put("name",etname.getText().toString());
sdb.insert("student",null, values);
Toast.makeText(getApplicationContext(), "注册成功", Toast.LENGTH_SHORT).show();
Intent intent=new Intent(Register.this,User.class);
Bundle bundle=new Bundle();
bundle.putString("name",etname.getText().toString());
intent.putExtras(bundle);
startActivity(intent);;
}
catch(SQLiteException e)
{Toast.makeText(getApplicationContext(), "注册失败", Toast.LENGTH_SHORT).show();}
}
}
class quListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(Register.this,MainActivity.class);
startActivity(intent);
}
}
}
6,效果图所示
注：图片自己引用
【原创】android——SQLite实现简单的注册登陆（已经美化）,布布扣,bubuko.com
时间： 2024-08-02 02:47:34