Android_rom存储，sp存储，sdcard存储

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Android_rom存储，sp存储，sdcard存储

2014年02月18日 ⁄ 综合 ⁄ 共 9126字 ⁄ 字号小中大 ⁄ 评论关闭

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<String, String> 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<String,String> readFile(String fileName){
		Map<String,String> map=null;
		try{
			FileInputStream fis=context.openFileInput(fileName);
			String value=StreamTools.getValue(fis);
			String values[]=value.split(":");
			if(values.length>0){
				map=new HashMap<String, String>();
				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<String,String> readFileSDCard(String fileName){
		Map<String,String> 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<String, String>();
				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

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".LoginActivity" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/view_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/text_name" />

            <EditText
                android:id="@+id/edit_name"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textPersonName" >

                <requestFocus />
            </EditText>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/view_pass"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/text_pass" />

            <EditText
                android:id="@+id/edit_pass"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:inputType="textPassword" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/btn_login"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.17"
                android:text="@string/text_login" />

            <CheckBox
                android:id="@+id/cbx_remember"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="80dp"
                android:text="@string/text_rember" />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/linearLayout1"
        android:layout_below="@+id/linearLayout1" >

        <RadioGroup
            android:id="@+id/rg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            tools:ignore="UselessParent" >

            <RadioButton
                android:id="@+id/radio_rom"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:checked="true"
                android:text="@string/rom" />

            <RadioButton
                android:id="@+id/radio_sp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/sp" />

            <RadioButton
                android:id="@+id/radio_sd"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/sd" />
        </RadioGroup>

    </LinearLayout>

</RelativeLayout>

String.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">save_sp</string>
    <string name="action_settings">Settings</string>
    <string name="save_sp">save_sp</string>
	<string name="text_name">用户名:</string>
    <string name="text_pass">密　码:</string>
    <string name="text_login">登陆</string>
    <string name="text_rember">记住密码</string>
    <string name="rom">rom存储</string>
    <string name="sp">sp存储</string>
    <string name="sd">sd存储</string>
</resources>

需要添加的权限：

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

【上篇】SharePoint 在代码里取表单认证里的Membershipprovider的信息
【下篇】SRM500 DIV2 – SRMCards

作者: stabbing

该日志由 stabbing 于10年前发表在综合分类下，最后更新于 2014年02月18日.
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Android_rom存储，sp存储，sdcard存储

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