Android开发数据保存方式的使用方法

释放双眼,带上耳机,听听看~!

 

少量数据保存之SharedPreferences接口实例
SharedPreferences数据保存主要是通过键值的方式存储在xml文件中
xml文件在data/此程序的包名/XX.xml。
格式:

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
<int name="count" value="3" />
<string name="time">写入日期:2013年10月07日,时间:11:28:09</string>
</map>

SharedPreferences读写的基本步骤:
读:
1.通过Context的getSharedPreferences获取SharedPreferences接口的对象share:SharedPreferences share = this.getSharedPreferences(“share”,Context.MODE_PRIVATE);
“shre”保存的xml文件名 ,Context.MODE_PRIVATE 保存的类型为只被本程序访问 (还有MODE_WORLD_READABLE表示其余的程序能够读不能写,MODE
_WORLD_WRITEBLE能读写 这两个都在api17的时候被废了)
2.通过share的getXXX的方法获取指定key的值 :  share.getInt(“count”, 0);
写:
1.通过SharedPreferences对象的edit()方法获取Edit对象:Edit   editor = share.edit();
2.通过editor对象的putXXX方法来写入值 :editor.putInt(“count”, 1);
3.调用Editor的commit()方法提交修改值 :editor.commit();

访问其他程序的SharedPreferences
访问其他程序的SharedPreferences 的读写唯一不同的是先的获取该程序的Context接口对象:this.createPackageContext(packageName, flags)
packageName为要该目标程序的包名,flags访问类型
其余的就和上面的步骤差不多 就不再概叙

实例

<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"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="@+id/write"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="写入数据" />
<Button
android:id="@+id/read"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="读入数据" />
<TextView
android:id="@+id/txtCount"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/txt1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
package com.android.xiong.sharepreferencestest;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
private Button write;
private Button read;
private TextView txt1;
private TextView countTxt;
SharedPreferences share ;
Editor editor;
int countO=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取SharedPreferences对象
share = this.getSharedPreferences("share",
Context.MODE_PRIVATE);
//获取Editor对象
editor = share.edit();
write = (Button) findViewById(R.id.write);
read = (Button) findViewById(R.id.read);
txt1 = (TextView) findViewById(R.id.txt1);
countTxt=(TextView)findViewById(R.id.txtCount);
//获取share中key为count的值
countO=share.getInt("count", 0);
countO++;
//修改share中key为count的值
editor.putInt("count", countO);
//提交修改
editor.commit();
System.out.println("该应用程序使用了:"+countO+"次");
countTxt.setText("该应用程序使用了:"+countO+"次");
OnClickListener writeListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SimpleDateFormat data = new SimpleDateFormat(
"写入日期:yyyy年MM月dd日,时间:hh:mm:ss");
editor.putString("time",
data.format(new Date()));
editor.commit();
}
};
OnClickListener readListener=new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!share.contains("share")){
txt1.setText(share.getString("time", null));
}
}
};
write.setOnClickListener(writeListener);
read.setOnClickListener(readListener);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

机身内存数据读写(Internal Storage)
1.机身内存读取主要用个两个类文件输入流(FileInputStream)和文件输出流(FileOutputStream): FileInputStream fileInput = this.openFileInput(“test.txt”) 第一个参数为 data/此程序包名/data/test.txt 文件下 的文件名 ;
FileOutputStream fileOut = this.openFileOutput(“test.txt”,this.MODE_APPEND)第一个参数表示文件名 第二个参数表示打开的方式
2.获取了文件输入输出流之后 其后的文件的读写和基本的IO操作一样
机身内存数据读写实例

<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"
android:layout_gravity="center_horizontal"
android:orientation="vertical"
tools:context=".MainActivity" >
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/ed1"
android:inputType="textMultiLine"/>
<Button
android:id="@+id/write"
android:text="写入"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/read"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="读入"/>
<EditText
android:id="@+id/ed2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"/>
<Button
android:id="@+id/delete"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="删除指定的文件"
/>
<EditText
android:id="@+id/ed3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
package com.android.xiong.fileiotest;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private Button read;
private Button write;
private EditText ed1;
private EditText ed2;
private EditText ed3;
private Button delete;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
read = (Button) findViewById(R.id.read);
write = (Button) findViewById(R.id.write);
delete = (Button) findViewById(R.id.delete);
ed3 = (EditText) findViewById(R.id.ed3);
ed2 = (EditText) findViewById(R.id.ed2);
ed1 = (EditText) findViewById(R.id.ed1);
write.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String str = ed1.getText().toString();
if (!str.equals("")) {
write(str);
}
}
});
read.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
read();
}
});
delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String str = ed3.getText().toString();
if (!str.equals("")) {
deleteFiles(str);
} else {
ed3.setText(str + ":该文件输入错误或不存在!");
}
}
});
}
private void write(String content) {
try {
// 以追加的方式打开文件输出流
FileOutputStream fileOut = this.openFileOutput("test.txt",
this.MODE_APPEND);
// 写入数据
fileOut.write(content.getBytes());
// 关闭文件输出流
fileOut.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private void read() {
try {
ed2.setText("");
// 打开文件输入流
FileInputStream fileInput = this.openFileInput("test.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(
fileInput));
String str = null;
StringBuilder stb = new StringBuilder();
while ((str = br.readLine()) !=null ) {
stb.append(str);
}
ed2.setText(stb);
} catch (Exception e) {
e.printStackTrace();
}
}
//删除指定的文件
private void deleteFiles(String fileName) {
try {
// 获取data文件中的所有文件列表
List<String> name = Arrays.asList(this.fileList());
if (name.contains(fileName)) {
this.deleteFile(fileName);
ed3.setText(fileName + ":该文件成功删除!");
} else
ed3.setText(fileName + ":该文件输入错误或不存在!");
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

SDcard(External Storage)读写数据实例
1.SDcard数据读写需要注定的先要在Androidmainfest.xml文件中注册新建删除和读写的权限 :

<!-- 在SD卡上创建与删除权限 -->
<uses-permission Android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" />
<!-- 向SD卡上写入权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2.读写的基本流程就是:
2.1 通过Environment类的getExternalStorageState()方法来判断手机是否有SDcard:

Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)

2.2 最通过getExternalStorageDirectory()方法来获取文件目录:

File file = new File(Environment.getExternalStorageDirectory().getCanonicalPath() + “/test.txt”);

读写的文件都在sdcrad文件夹中 通过File Explorer可以导出来
2.3 其后就和基本IO操作相同了
2.4还有要注意一点的是 在运行的模拟器的时候要附带虚拟的SDcard时  要在Run as->Run Configurations 中要关联一下 如下图
2016423111920416.png (974×424)
SDcard数据读写实例
<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"
android:gravity="center_horizontal"
android:orientation="vertical"
tools:context=".MainActivity" >
<EditText
android:id="@+id/ed1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"/>
<Button
android:id="@+id/write"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="写入SD卡中"/>
<Button
android:id="@+id/read"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="读取SD文件"/>
<TextView
android:id="@+id/txt1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.xiong.sdcardtest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<!-- 在SD卡上创建与删除权限 -->
<uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" />
<!-- 向SD卡上写入权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.android.xiong.sdcardtest.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package com.android.xiong.sdcardtest;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private Button write;
private Button read;
private EditText ed1;
private TextView txt1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
write = (Button) findViewById(R.id.write);
read = (Button) findViewById(R.id.read);
ed1 = (EditText) findViewById(R.id.ed1);
txt1 = (TextView) findViewById(R.id.txt1);
write.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
writeSDcard(ed1.getText().toString());
}
});
read.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
txt1.setText(readSDcard());
}
});
}
// 把数据写入SD卡
private void writeSDcard(String str) {
try {
// 判断是否存在SD卡
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 获取SD卡的目录
File file = Environment.getExternalStorageDirectory();
FileOutputStream fileW = new FileOutputStream(file.getCanonicalPath() + "/test.txt");
fileW.write(str.getBytes());
fileW.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 从SD卡中读取数据
private String readSDcard() {
StringBuffer str = new StringBuffer();
try {
// 判断是否存在SD
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File file = new File(Environment.getExternalStorageDirectory()
.getCanonicalPath() + "/test.txt");
// 判断是否存在该文件
if (file.exists()) {
// 打开文件输入流
FileInputStream fileR = new FileInputStream(file);
BufferedReader reads = new BufferedReader(
new InputStreamReader(fileR));
String st = null;
while ((st =reads.readLine())!=null ) {
str.append(st);
}
fileR.close();
} else {
txt1.setText("该目录下文件不存在");
}
}
} catch (Exception e) {
e.printStackTrace();
}
return str.toString();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

SQLite简介和简单的登录与注册源代码
1.获取SQLiteDatabase对象db创建数据库或连接数据库:SQLiteDatabasedb = SQLiteDatabase.openOrCreateDatabase(MainActivity.this.getFilesDir().toString()+ “/test.dbs”, null);如果目录下有test.dbs数据库则是连接没有就是创建
2.用对象db的方法来执行sql语句:db.execSQL(String sql) 此方法木有返回值 所以查询不好弄。查询一般用db.rawQuery返回一个Cursor对象(相当与jdbc中的ResultSet),Cursor有如下几个方法来查询数据:
2.1 move ToFirst 将记录指针跳到第一行
2.2 moveToLast将记录指针跳到最后一行
2.3 moveNext将记录指针移到下一行
2.4moveToPosition( int ss)将记录指针跳到指定的ss行
2.5moveToPrevious将记录指针跳到上一行
将记录指针跳到指定的行之后就可以通过对象的getXXX方法来获取数据 :如 Cursor cursor = db.rawQuery(“select  na,pw from user where na=? and pw=?”, new String []{name,pwd});
3.回收资源close
当然以SQLiteDatabase对象还可以调用许多方法来操作数据库,不过俺是觉得这几个方法基本够了

简单的登录与注册源代码:
(仅此来练习SQLite的操作  一般注册的信息都样上传到服务器而不会是存储在手机数据库)

2016423112521792.jpg (452×512)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.xiong.sqlitelogin"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="14" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.android.xiong.sqlitelogin.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.android.xiong.sqlitelogin.RegistersActivity"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
<RelativeLayout 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=".MainActivity" >
<TextView
android:id="@+id/login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:gravity="center_horizontal"
android:textColor="#8a2be2"
android:textSize="35dp"
android:text="登录界面" />
<TextView
android:id="@+id/txtname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/login"
android:layout_marginRight="5dp"
android:layout_marginBottom="30dp"
android:textSize="28dp"
android:text="用户帐号:"/>
<EditText
android:id="@+id/edname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="30dp"
android:layout_below="@id/login"
android:layout_toRightOf="@id/txtname"
android:layout_alignParentRight="true"
android:hint="请输入用户帐号"/>
<TextView
android:id="@+id/txtpassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtname"
android:layout_marginRight="5dp"
android:textSize="28dp"
android:text="用户密码:"/>
<EditText
android:id="@+id/edpassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/edname"
android:layout_toRightOf="@id/txtpassword"
android:layout_alignParentRight="true"
android:inputType="textPassword"
android:hint="请输入用户密码"/>
<LinearLayout
android:layout_below="@id/edpassword"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:gravity="center_horizontal" >
<Button
android:id="@+id/btregister"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginRight="20dp"
android:text="用户注册"/>
<Button
android:id="@+id/btlogin"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="用户登录"/>
</LinearLayout>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/txt1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:gravity="center_horizontal"
android:text="注册界面"
android:textColor="#8a2be2"
android:textSize="35dp" />
<TextView
android:id="@+id/txtname1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txt1"
android:layout_marginBottom="30dp"
android:layout_marginRight="5dp"
android:text="帐号:"
android:textSize="28dp" />
<EditText
android:id="@+id/edname1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@id/txt1"
android:layout_toRightOf="@id/txtname1"
android:layout_marginBottom="30dp" />
<TextView
android:id="@+id/txtpassword1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtname1"
android:layout_marginRight="5dp"
android:text="密码:"
android:textSize="28dp" />
<EditText
android:id="@+id/edpassword1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@id/edname1"
android:layout_toRightOf="@id/txtpassword1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/edpassword1"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="@+id/btregister1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:text="提交数据" />
</LinearLayout>
</RelativeLayout>
package com.android.xiong.sqlitelogin;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
// 帐号和密码
private EditText edname;
private EditText edpassword;
private Button btregister;
private Button btlogin;
// 创建SQLite数据库
public static SQLiteDatabase db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edname = (EditText) findViewById(R.id.edname);
edpassword = (EditText) findViewById(R.id.edpassword);
btregister = (Button) findViewById(R.id.btregister);
btlogin = (Button) findViewById(R.id.btlogin);
db = SQLiteDatabase.openOrCreateDatabase(MainActivity.this.getFilesDir().toString()
+ "/test.dbs", null);
// 跳转到注册界面
btregister.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(MainActivity.this, RegistersActivity.class);
startActivity(intent);
}
});
btlogin.setOnClickListener(new LoginListener());
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
db.close();
}
class LoginListener implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = edname.getText().toString();
String password = edpassword.getText().toString();
if (name.equals("") || password.equals("")) {
// 弹出消息框
new AlertDialog.Builder(MainActivity.this).setTitle("错误")
.setMessage("帐号或密码不能空").setPositiveButton("确定", null)
.show();
} else {
isUserinfo(name, password);
}
}
// 判断输入的用户是否正确
public Boolean isUserinfo(String name, String pwd) {
try{
String str="select * from tb_user where name=? and password=?";
Cursor cursor = db.rawQuery(str, new String []{name,pwd});
if(cursor.getCount()<=0){
new AlertDialog.Builder(MainActivity.this).setTitle("错误")
.setMessage("帐号或密码错误!").setPositiveButton("确定", null)
.show();
return false;
}else{
new AlertDialog.Builder(MainActivity.this).setTitle("正确")
.setMessage("成功登录").setPositiveButton("确定", null)
.show();
return true;
}
}catch(SQLiteException e){
createDb();
}
return false;
}
}
// 创建数据库和用户表
public void createDb() {
db.execSQL("create table tb_user( name varchar(30) primary key,password varchar(30))");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.android.xiong.sqlitelogin;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class RegistersActivity extends Activity {
private EditText edname1;
private EditText edpassword1;
private Button btregister1;
SQLiteDatabase db;
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
db.close();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
edname1 = (EditText) findViewById(R.id.edname1);
edpassword1 = (EditText) findViewById(R.id.edpassword1);
btregister1 = (Button) findViewById(R.id.btregister1);
btregister1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name = edname1.getText().toString();
String password = edpassword1.getText().toString();
if (!(name.equals("") && password.equals(""))) {
if (addUser(name, password)) {
DialogInterface.OnClickListener ss = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
// 跳转到登录界面
Intent in = new Intent();
in.setClass(RegistersActivity.this,
MainActivity.class);
startActivity(in);
// 销毁当前activity
RegistersActivity.this.onDestroy();
}
};
new AlertDialog.Builder(RegistersActivity.this)
.setTitle("注册成功").setMessage("注册成功")
.setPositiveButton("确定", ss).show();
} else {
new AlertDialog.Builder(RegistersActivity.this)
.setTitle("注册失败").setMessage("注册失败")
.setPositiveButton("确定", null);
}
} else {
new AlertDialog.Builder(RegistersActivity.this)
.setTitle("帐号密码不能为空").setMessage("帐号密码不能为空")
.setPositiveButton("确定", null);
}
}
});
}
// 添加用户
public Boolean addUser(String name, String password) {
String str = "insert into tb_user values(?,?) ";
MainActivity main = new MainActivity();
db = SQLiteDatabase.openOrCreateDatabase(this.getFilesDir().toString()
+ "/test.dbs", null);
main.db = db;
try {
db.execSQL(str, new String[] { name, password });
return true;
} catch (Exception e) {
main.createDb();
}
return false;
}
}

 

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