LoginActivity.java
package com.example.save_sp;
import java.util.Map;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;
import com.example.login.service.FileService;
public class LoginActivity extends Activity {
public EditText edit_name, edit_pass;
public Button btn_login;
public CheckBox box_remeber;
public FileService fileService;
public RadioButton radio_rom, radio_sp, radio_sd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
fileService = new FileService(this);
edit_name = (EditText) findViewById(R.id.edit_name);
edit_pass = (EditText) findViewById(R.id.edit_pass);
btn_login = (Button) findViewById(R.id.btn_login);
box_remeber = (CheckBox) findViewById(R.id.cbx_remember);
btn_login.setOnClickListener(new MyOnClickListener());
radio_rom = (RadioButton) findViewById(R.id.radio_rom);
radio_sp = (RadioButton) findViewById(R.id.radio_sp);
radio_sd = (RadioButton) findViewById(R.id.radio_sd);
Map map = fileService.readFile("sdcard.txt");
if (map != null) {
edit_name.setText(map.get("name"));
edit_pass.setText(map.get("pass"));
}
/*
* SharedPreferences
* preferences=this.getSharedPreferences("csdn",Context.MODE_PRIVATE);
* edit_name.setText(preferences.getString("name", "csdn"));
* edit_pass.setText(preferences.getString("pass", "csdn"));
*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
class MyOnClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
int id = v.getId();
switch (id) {
case R.id.btn_login:
String name = edit_name.getText().toString();
String pass = edit_pass.getText().toString();
if (TextUtils.isEmpty(name)) {
Toast.makeText(LoginActivity.this, "用户名不能为空",
Toast.LENGTH_SHORT).show();
return;
} else if (TextUtils.isEmpty(pass)) {
Toast.makeText(LoginActivity.this, "密码不能为空",
Toast.LENGTH_SHORT).show();
return;
} else {
if (box_remeber.isChecked()) {
if (radio_rom.isChecked()) {
LoginActivity.this.fileService.saveToRom(name,
pass, "private.txt");
Toast.makeText(LoginActivity.this, "用户名和密码已保存",
Toast.LENGTH_SHORT).show();
} else if (radio_sp.isChecked()) {
boolean flag = fileService.saveBysp(name, pass,
"csdn");
if (flag) {
Toast.makeText(LoginActivity.this, "保存成功",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(LoginActivity.this, "保存失败",
Toast.LENGTH_SHORT).show();
}
} else if (radio_sd.isChecked()) {
boolean flag = fileService.saveToSDCard(name, pass,
"sdcard.txt");
if (flag) {
Toast.makeText(LoginActivity.this, "保存成功",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(LoginActivity.this, "保存失败",
Toast.LENGTH_SHORT).show();
}
}
} else {
Toast.makeText(LoginActivity.this, "用户名和密码不需要保存",
Toast.LENGTH_SHORT).show();
}
}
break;
default:
break;
}
}
}
}
FileService.java
package com.example.login.service;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Environment;
import android.widget.Toast;
import com.example.login.utils.StreamTools;
public class FileService {
public Context context;
public FileService(Context context) {
this.context = context;
}
public boolean saveToRom(String name,String pass,String fileName){
try{
FileOutputStream fos=context.openFileOutput(fileName, Context.MODE_PRIVATE);
String result=name+":"+pass;
fos.write(result.getBytes());
fos.flush();
fos.close();
}catch(Exception e){
e.printStackTrace();
return false;
}
return true;
}
public Map readFile(String fileName){
Map map=null;
try{
FileInputStream fis=context.openFileInput(fileName);
String value=StreamTools.getValue(fis);
String values[]=value.split(":");
if(values.length>0){
map=new HashMap();
map.put("name", values[0]);
map.put("pass", values[1]);
}
}catch(Exception e){
e.printStackTrace();
}
return map;
}
public boolean saveBysp(String name,String pass,String fileName){
SharedPreferences preferences=context.getSharedPreferences(fileName, Context.MODE_PRIVATE);
Editor editor=preferences.edit();
editor.putString("name", name);
editor.putString("pass", pass);
return editor.commit();
}
public boolean saveToSDCard(String name,String pass,String fileName){
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
File sdCardDir=Environment.getExternalStorageDirectory();
File file=new File(sdCardDir,fileName);
try{
FileOutputStream fos=new FileOutputStream(file);
String result=name+":"+pass;
fos.write(result.getBytes());
fos.flush();fos.close();
}catch (Exception e) {
e.printStackTrace();
return false;
}
}else{
Toast.makeText(context, "SDCard没有找到!", Toast.LENGTH_LONG).show();
}
return true;
}
public Map readFileSDCard(String fileName){
Map map=null;
try{
File sdCardDir=Environment.getExternalStorageDirectory();
File file = new File(sdCardDir, fileName);
FileInputStream fis=new FileInputStream(file);
String value = StreamTools.getValue(fis);
String values[]=value.split(":");
if(values.length>0){
map=new HashMap();
map.put("name", values[0]);
map.put("pass", values[1]);
}
}catch(Exception e){
e.printStackTrace();
}
return map;
}
}
StreamTools.java
package com.example.login.utils;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
public class StreamTools {
public static String getValue(FileInputStream fis) throws Exception{
ByteArrayOutputStream stream=new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
int length=-1;
while((length=fis.read(buffer))!=-1){
stream.write(buffer,0,length);
}
stream.flush();
stream.close();
String value=stream.toString();
return value;
}
}
login_activity.xml
String.xml
save_sp
Settings
save_sp
用户名:
密 码:
登陆
记住密码
rom存储
sp存储
sd存储
需要添加的权限: