Android---09---保存数据到手机内存和存储卡

package com.licheng.caller;

import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private static final String TAG = "MainActivity";
private EditText etNumber;
private EditText etPassword;
private CheckBox cbRemenberPWD;
private Button btnLogin;

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

etNumber = (EditText) findViewById(R.id.et_number);
etPassword = (EditText) findViewById(R.id.et_password);
cbRemenberPWD = (CheckBox) findViewById(R.id.cb_remenber_pwd);
btnLogin = (Button) findViewById(R.id.btn_login);
btnLogin.setOnClickListener(this);

//回显数据
Map<String, String> userInfoMap = UtilsofSDCard.getUserInfo(this);
if(userInfoMap!=null){
etNumber.setText(userInfoMap.get("number"));
etPassword.setText(userInfoMap.get("password"));
}
}

@Override
public void onClick(View arg0) {
// 1,取出号码和密码
String number = etNumber.getText().toString();
String password = etPassword.getText().toString();
if (TextUtils.isEmpty(number) || TextUtils.isEmpty(password)) {

Toast.makeText(this, "请正确输入", Toast.LENGTH_SHORT).show();
return;
}
// 2，判断记住密码是否被选中，如果被选中，存起来
if (cbRemenberPWD.isChecked()) {
Log.i(TAG, "记住密码"+number+","+password);
boolean isSuccess = UtilsofSDCard.saveUserInfo(this,number, password);
if(isSuccess){
Toast.makeText(this, "保存成功", 0).show();
}else{
Toast.makeText(this, "保存失败", 0).show();
}
}
// 3,登录成功
Toast.makeText(this, "登录成功", 0).show();
}
}

package com.licheng.caller;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.text.TextUtils;

public class Utils {
/**
* 保存用户信息
*
* @param number
* @param password
* @return true 成功
*/

public static boolean saveUserInfo(Context context, String number,
String password) {

try {
File filesDir = context.getFilesDir();
File f=new File(filesDir, "pwd.txt");
//String path = "/data/data/com.licheng.caller/pwd.txt";
FileOutputStream fos = new FileOutputStream(f);
String data = number + "##" + password;
fos.write(data.getBytes());
fos.flush();
fos.close();
return true;
} catch (Exception e) {
e.printStackTrace();
}

return false;
}

/**
* 返回用户信息
*
* @return
*/
public static Map<String, String> getUserInfo(Context context) {
try {
File filesDir = context.getFilesDir();
File f=new File(filesDir, "pwd.txt");
//String path = "/data/data/com.licheng.caller/pwd.txt";
FileInputStream fis = new FileInputStream(f);
BufferedReader reader = new BufferedReader(new InputStreamReader(
fis));
String text = reader.readLine();

if (!TextUtils.isEmpty(text)) {
String[] split = text.split("##");
HashMap<String, String> userInfoMap = new HashMap<String, String>();
userInfoMap.put("number", split[0]);
userInfoMap.put("password", split[1]);
return userInfoMap;
}
return null;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

package com.licheng.caller;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;

public class UtilsofSDCard {
/**
* 保存用户信息到SD卡
*
* @param number
* @param password
* @return true 成功
*/

public static boolean saveUserInfo(Context context, String number,
String password) {

try {
//判断当前是否有SD卡
String state = Environment.getExternalStorageState();
if(!Environment.MEDIA_MOUNTED.equals(state)){
return false;
}

File sdCardFile = Environment.getExternalStorageDirectory();
File file=new File(sdCardFile,"pwd.txt");
FileOutputStream fos = new FileOutputStream(file);
String data = number + "##" + password;
fos.write(data.getBytes());
fos.flush();
fos.close();
return true;
} catch (Exception e) {

e.printStackTrace();
}

return false;
}

/**
* 到SD卡获取用户信息
*
* @return
*/
public static Map<String, String> getUserInfo(Context context) {

try {

//判断当前是否有SD卡
String state = Environment.getExternalStorageState();
if(!Environment.MEDIA_MOUNTED.equals(state)){
return null;
}

File sdCardFile = Environment.getExternalStorageDirectory();
File file=new File(sdCardFile,"pwd.txt");
FileInputStream fis= new FileInputStream(file);
BufferedReader reader = new BufferedReader(new InputStreamReader(
fis));
String text = reader.readLine();
reader.close();

if (!TextUtils.isEmpty(text)) {
String[] split = text.split("##");
HashMap<String, String> userInfoMap = new HashMap<String, String>();
userInfoMap.put("number", split[0]);
userInfoMap.put("password", split[1]);
return userInfoMap;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;
}
}

<?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="vertical" >

<EditText
android:id="@+id/et_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入QQ号：" />

<EditText
android:id="@+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入密码：："
android:inputType="textPassword" />

<CheckBox
android:id="@+id/cb_remenber_pwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="记住密码" />

<Button
android:id="@+id/btn_login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="登录" />

</LinearLayout>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

package com.licheng.caller;

import java.io.FileOutputStream;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;

public class MainActivity extends Activity {

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

// 写数据
// /data/data/包名/files/abc.txt

// 私有文件
writeToLocal("private.txt", Context.MODE_PRIVATE);
// 可读文件
writeToLocal("readable.txt", Context.MODE_WORLD_READABLE);
// 可写文件
writeToLocal("writeable.txt", Context.MODE_WORLD_WRITEABLE);
// 可读可写文件
writeToLocal("readable_writeable.txt", Context.MODE_WORLD_READABLE
+ Context.MODE_WORLD_WRITEABLE);

}

private void writeToLocal(String fileName, int mode) {
try {
FileOutputStream fos = openFileOutput(fileName, mode);
fos.write(("写数据：" + fileName).getBytes());
fos.flush();
fos.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}