【黑马Android】(02)短信发送器/布局演示/android下单位/android下Junit/保存数据/android下权限/xml解析和序列化-阿里云开发者社区

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【黑马Android】(02)短信发送器/布局演示/android下单位/android下Junit/保存数据/android下权限/xml解析和序列化

简介: <p></p> <p></p> <h2> <span style="font-family:黑体; font-size:16pt">短信发送器</span><span style="font-family:黑体; font-size:16pt"></span> </h2> <pre code_snippet_id="1605445" snippet_file_name="blog_2

短信发送器

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.smssender"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.SEND_SMS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.smssender.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>

<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/tv_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请输入手机号" />

    <EditText
        android:id="@+id/et_number"
        android:inputType="number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv_number" />

    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_number"
        android:text="请输入短信内容" />

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="200px"
        android:gravity="top"
        android:layout_below="@id/tv_content" />

    <Button
        android:id="@+id/btn_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_content"
        android:text="发送短信" />

</RelativeLayout>

package com.itheima28.smssender;

import android.os.Bundle;
import android.app.Activity;
import android.telephony.SmsManager;
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 implements OnClickListener {
	
	private EditText etNumber;
	private EditText etContent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
        etNumber = (EditText) findViewById(R.id.et_number);
        etContent = (EditText) findViewById(R.id.et_content);
        
        Button button = (Button) findViewById(R.id.btn_send);
        button.setOnClickListener(this);
    }

	@Override
	public void onClick(View v) {
		// 号码
		String number = etNumber.getText().toString();
		// 内容
		String content = etContent.getText().toString();
		
		SmsManager smsManager = SmsManager.getDefault();
		
		smsManager.sendTextMessage(
				number,	// 收件人
				null, 	// 短信中心号码
				content, // 内容
				null, 
				null);
	}
    
}

布局演示(LinearLayout, RelativeLayout)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:text="按钮1" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="right|center_vertical"
        android:text="按钮2" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按钮3" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="按钮1" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="按钮2" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            an<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:text="按钮1" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="right|center_vertical"
        android:text="按钮2" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按钮3" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="按钮1" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="按钮2" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="gone"
            android:text="按钮3" />
    </LinearLayout>

</LinearLayout>droid:visibility="gone"
            android:text="按钮3" />
    </LinearLayout>

</LinearLayout>


<?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" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="进攻" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:text="左勾拳" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="右勾拳" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="逃跑" />

    <Button
        android:id="@+id/btn_bisha"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="大绝招" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@id/btn_bisha"
        android:layout_alignTop="@id/btn_bisha"
        android:text="左" />
    
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/btn_bisha"
        android:layout_centerHorizontal="true"
        android:text="上" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/btn_bisha"
        android:layout_alignBaseline="@id/btn_bisha"
        android:text="右" />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn_bisha"
        android:layout_centerHorizontal="true"
        android:text="下" />
</RelativeLayout>

布局演示和android下单位

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="1dp"
        android:layout_y="253dp"
        android:text="按钮" />

</AbsoluteLayout>

在制作播放器的时候,按钮是层次的。可以使用这种布局方式。

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:layout_width="300px"
        android:layout_height="300px"
        android:layout_gravity="center"
        android:text="最底部" />

    <Button
        android:layout_width="150px"
        android:layout_height="150px"
        android:layout_gravity="center"
        android:text="中间" />
    
    <Button
        android:layout_width="50px"
        android:layout_height="50px"
        android:layout_gravity="center"
        android:text="顶部" />
</FrameLayout>


<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:shrinkColumns="0"
    android:collapseColumns="0" >

    <TableRow android:layout_height="wrap_content" >

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第一行, 0列" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第一行, 1列" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第一行, 2列" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第一行, 3列" />
    </TableRow>

    <TableRow android:layout_height="wrap_content" >
        
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="第二行, 0列" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_column="2"
            android:layout_span="2"
            android:text="第二行, 1列" />
    </TableRow>

</TableLayout>

<?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" >

    <Button
        android:layout_width="160px"
        android:layout_height="wrap_content"
        android:text="单位是px"
        android:textSize="18px" />

    <Button
        android:layout_width="160dp"
        android:layout_height="wrap_content"
        android:text="单位是sp"
        android:textSize="18sp" />
</LinearLayout>

androidJunit

冒烟测试:

adb shell monkey -p <程序的包名> -v <事件的数量>


android下单元测试:

AndroidManifest.xml文件中配置一下信息:

 

    在manifest节点下:

    <instrumentation

        android:name="android.test.InstrumentationTestRunner"

        android:targetPackage="com.itheima28.junittest" />

 

    在application节点下配置下面信息:

    <uses-library android:name="android.test.runner" />

 

测试时定义一个类继承AndroidTestCase

使用另外一个工程进行单元测试



保存数据到手机内存


<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" >

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

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

    <CheckBox
        android:id="@+id/cb_remerber_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>

package com.itheima28.qqlogin.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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(String number, String password) {
		
		try {
			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";
			
			FileOutputStream fos = new FileOutputStream(path);
			
			// 307966990##123123
			String data = number + "##" + password;
			
			fos.write(data.getBytes());
			
			fos.flush();
			
			fos.close();
			
			return true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return false;
	}
	
	/**
	 * 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 {
//			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";
			
//			File filesDir = context.getFilesDir();
			File filesDir = context.getCacheDir();
			
			File f = new File(filesDir, "itheima28.txt");
			
			FileOutputStream fos = new FileOutputStream(f);
			
			// 307966990##123123
			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() {

		try {
			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";
			
			FileInputStream fis = new FileInputStream(path);
			
			// 字符流对象
			BufferedReader reader = new BufferedReader(new InputStreamReader(fis));

			// 307966990##123123
			String text = reader.readLine();
			
			if(!TextUtils.isEmpty(text)) {
				String[] split = text.split("##");
			
				Map<String, String> userInfoMap = new HashMap<String, String>();
				userInfoMap.put("number", split[0]);
				userInfoMap.put("password", split[1]);
				return userInfoMap;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	

	/**
	 * 返回用户信息
	 * @return
	 */
	public static Map<String, String> getUserInfo(Context context) {

		try {
//			String path = "/data/data/com.itheima28.qqlogin/itheima28.txt";
			
//			File filesDir = context.getFilesDir();
			File filesDir = context.getCacheDir();
			
			File f = new File(filesDir, "itheima28.txt");
			
			FileInputStream fis = new FileInputStream(f);
			
			// 字符流对象
			BufferedReader reader = new BufferedReader(new InputStreamReader(fis));

			// 307966990##123123
			String text = reader.readLine();
			
			if(!TextUtils.isEmpty(text)) {
				String[] split = text.split("##");
			
				Map<String, String> userInfoMap = new HashMap<String, String>();
				userInfoMap.put("number", split[0]);
				userInfoMap.put("password", split[1]);
				return userInfoMap;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}

package com.itheima28.qqlogin;

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;

import com.itheima28.qqlogin.utils.Utils;
import com.itheima28.qqlogin.utils.UtilsOfSharedPreferences;

public class MainActivity extends Activity implements OnClickListener {

	private static final String TAG = "MainActivity";
	private EditText etNumber;
	private EditText etPassword;
	private CheckBox cbRemerberPWD;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		etNumber = (EditText) findViewById(R.id.et_number);
		etPassword = (EditText) findViewById(R.id.et_password);
		cbRemerberPWD = (CheckBox) findViewById(R.id.cb_remerber_pwd);
		Button btnLogin = (Button) findViewById(R.id.btn_login);
		
		btnLogin.setOnClickListener(this);
		
		// 回显数据
		Map<String, String> userInfoMap = UtilsOfSharedPreferences.getUserInfo(this);
		if(userInfoMap != null) {
			etNumber.setText(userInfoMap.get("number"));
			etPassword.setText(userInfoMap.get("password"));
		}
	}

	@Override
	public void onClick(View v) {
		// 执行登录的操作
		
		// 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)) {
			// 弹出吐司
			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(cbRemerberPWD.isChecked()) {
			// 当前需要记住密码
			Log.i(TAG, "记住密码: " + number + ", " + password);
			
			boolean isSuccess = UtilsOfSharedPreferences.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. 登陆成功
		Toast.makeText(this, "登录成功", 0).show();
	}
}

保存数据到sd

package com.itheima28.qqlogin.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
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 {
			// 判断当前的手机是否有sd卡
			String state = Environment.getExternalStorageState();
			
			if(!Environment.MEDIA_MOUNTED.equals(state)) {
				// 已经挂载了sd卡
				return false;
			}
			
			File sdCardFile = Environment.getExternalStorageDirectory();
			
			File file = new File(sdCardFile, "itheima28.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 {
			// 判断当前的手机是否有sd卡
			String state = Environment.getExternalStorageState();
			
			if(!Environment.MEDIA_MOUNTED.equals(state)) {
				// 已经挂载了sd卡
				return null;
			}
			
			File sdCardFile = Environment.getExternalStorageDirectory();
			
			File file = new File(sdCardFile, "itheima28.txt");
			
			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
			
			String text = br.readLine();
			
			br.close();
			
			if(!TextUtils.isEmpty(text)) {
				Map<String, String> userInfoMap = new HashMap<String, String>();
				String[] split = text.split("##");
				userInfoMap.put("number", split[0]);
				userInfoMap.put("password", split[1]);
				return userInfoMap;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itheima28.qqlogin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
<!--     写入sd卡的权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.itheima28.qqlogin.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>

获得内存状态

获取sd卡的剩余空间;

package com.itheima28.memorydemo;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.text.format.Formatter;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		TextView tvMemoryInfo = (TextView) findViewById(R.id.tv_memory_info);
		
		// 获得sd卡的内存状态
		File sdcardFileDir = Environment.getExternalStorageDirectory();
		String sdcardMemory = getMemoryInfo(sdcardFileDir);
		
		// 获得手机内部存储控件的状态
		File dataFileDir = Environment.getDataDirectory();
		String dataMemory = getMemoryInfo(dataFileDir);
		
		tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手机内部: " + dataMemory);
	}

	/**
	 * 根据路径获取内存状态
	 * @param path
	 * @return
	 */
	private String getMemoryInfo(File path) {
		// 获得一个磁盘状态对象
        StatFs stat = new StatFs(path.getPath());
        
        long blockSize = stat.getBlockSize();	// 获得一个扇区的大小
        
        long totalBlocks = stat.getBlockCount();	// 获得扇区的总数
        
        long availableBlocks = stat.getAvailableBlocks();	// 获得可用的扇区数量
        
        // 总空间
        String totalMemory =  Formatter.formatFileSize(this, totalBlocks * blockSize);
        // 可用空间
        String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSize);
		
		return "总空间: " + totalMemory + "\n可用空间: " + availableMemory;
	}
}
<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=".MainActivity" >

    <TextView
        android:id="@+id/tv_memory_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

</RelativeLayout>

android下权限

文件存储:

 

this.getFilesDir(); // /data/data/包名/files

this.getCacheDir(); // /data/data/包名/cache

 

openFileOutput("aa.txt", 0); /data/data/包名/files/aa.txt

权限相关:

1. 私有文件

2. 可读文件

3. 可写文件

4. 可读可写文件.

写数据_权限相关

package com.itheima28.writedata;

import java.io.FileNotFoundException;
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.activity_main);			
		// 写数据		
		// 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(("第一个程序写的数据: " + fileName).getBytes());
			fos.flush();
			fos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

读数据_权限相关

<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/btn_read_private"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读私有文件" />

    <Button
        android:id="@+id/btn_write_private"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="写私有文件" />

    <Button
        android:id="@+id/btn_read_readable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读可读文件" />

    <Button
        android:id="@+id/btn_write_readable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="写可读文件" />

    <Button
        android:id="@+id/btn_read_writeable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读可写文件" />

    <Button
        android:id="@+id/btn_write_writeable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="写可写文件" />

    <Button
        android:id="@+id/btn_read_readable_writeable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="读可读可写文件" />

    <Button
        android:id="@+id/btn_write_readable_writeable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="写可读可写文件" />

</LinearLayout>
package com.itheima28.readdata;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
	
	private String basicPath = "/data/data/com.itheima28.writedata/files/";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		findViewById(R.id.btn_read_private).setOnClickListener(this);
		findViewById(R.id.btn_write_private).setOnClickListener(this);
		
		findViewById(R.id.btn_read_readable).setOnClickListener(this);
		findViewById(R.id.btn_write_readable).setOnClickListener(this);
		
		findViewById(R.id.btn_read_writeable).setOnClickListener(this);
		findViewById(R.id.btn_write_writeable).setOnClickListener(this);
		
		findViewById(R.id.btn_read_readable_writeable).setOnClickListener(this);
		findViewById(R.id.btn_write_readable_writeable).setOnClickListener(this);
	}

	/**
	 * 哪一个控件被点击, v对象就代表被点击的对象
	 */
	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_read_private:
			readFile("private.txt");
			break;
		case R.id.btn_write_private:
			writeFile("private.txt");
			break;
		case R.id.btn_read_readable:
			readFile("readable.txt");
			break;
		case R.id.btn_write_readable:
			writeFile("readable.txt");
			break;
		case R.id.btn_read_writeable:
			readFile("writeable.txt");
			break;
		case R.id.btn_write_writeable:
			writeFile("writeable.txt");
			break;
		case R.id.btn_read_readable_writeable:
			readFile("readable_writeable.txt");
			break;
		case R.id.btn_write_readable_writeable:
			writeFile("readable_writeable.txt");
			break;
		default:
			break;
		}
	}

	/**
	 * 读文件
	 * @param fileName
	 */
	private void readFile(String fileName) {
		try {
			String path = basicPath + fileName;
			
			BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
			String text = reader.readLine();
			reader.close();
			Toast.makeText(this, "读取成功: " + text, 0).show();
		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(this, "读取失败: " + fileName, 0).show();
		}
	}
	
	private void writeFile(String fileName) {
		try {
			String path = basicPath + fileName;
			
			FileOutputStream fos = new FileOutputStream(path);
			
			fos.write("哈哈, 被我给黑了".getBytes());
			
			fos.flush();
			
			fos.close();
			Toast.makeText(this, "写入成功: " + fileName, 0).show();
		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(this, "写入失败: " + fileName, 0).show();
		}
	}
	
}

SharedPreferences使用

SharedPreferences存储路径:/data/data/包名/shared_prefs/

package com.itheima28.qqlogin.utils;

import java.util.HashMap;
import java.util.Map;

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

public class UtilsOfSharedPreferences {

	/**
	 * 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 {
			// /data/data/包名/shared_prefs/itheima28
			SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);
			
			// 获得一个编辑对象
			Editor edit = sp.edit();
			
			// 存数据
			edit.putString("number", number);
			edit.putString("password", password);
			
			// 提交, 数据真正存储起来了.
			edit.commit();
			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) {
		
		SharedPreferences sp = context.getSharedPreferences("itheima28", Context.MODE_PRIVATE);
		
		String number = sp.getString("number", null);
		String password = sp.getString("password", null);
		
		if(!TextUtils.isEmpty(number) && !TextUtils.isEmpty(password)) {
			Map<String, String> userInfoMap = new HashMap<String, String>();
			userInfoMap.put("number", number);
			userInfoMap.put("password", password);
			return userInfoMap;
		}
		return null;
	}
}

xml解析和序列化

Person.java

package com.itheima28.xmldemo;

public class Person {

	private int id;
	private String name;
	private int age;
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	public Person(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	public Person() {
		super();
		// TODO Auto-generated constructor stub
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

TestCase.java

package com.itheima28.xmldemo.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;

import android.os.Environment;
import android.test.AndroidTestCase;
import android.util.Log;
import android.util.Xml;

import com.itheima28.xmldemo.Person;

public class TestCase extends AndroidTestCase {

	public void test() {
//		writeXmlToLocal();
		
		List<Person> personList = parserXmlFromLocal();
		
		for (Person person : personList) {
			Log.i("TestCase", person.toString());
		}
	}
	
	/**
	 * 写xml文件到本地
	 */
	private void writeXmlToLocal() {
		List<Person> personList = getPersonList();
		
		// 获得序列化对象
		XmlSerializer serializer = Xml.newSerializer();
		
		try {
			File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
			FileOutputStream fos = new FileOutputStream(path);
			// 指定序列化对象输出的位置和编码
			serializer.setOutput(fos, "utf-8");
			
			serializer.startDocument("utf-8", true);	// 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?>
			
			serializer.startTag(null, "persons");		// <persons>
			
			for (Person person : personList) {
				// 开始写人

				serializer.startTag(null, "person");	// <person>
				serializer.attribute(null, "id", String.valueOf(person.getId()));
				
				// 写名字
				serializer.startTag(null, "name");		// <name>
				serializer.text(person.getName());
				serializer.endTag(null, "name");		// </name>
				
				// 写年龄
				serializer.startTag(null, "age");		// <age>
				serializer.text(String.valueOf(person.getAge()));
				serializer.endTag(null, "age");		// </age>
				
				serializer.endTag(null, "person");	// </person>
			}
			
			serializer.endTag(null, "persons");			// </persons>
			
			serializer.endDocument();		// 结束
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	private List<Person> getPersonList() {
		List<Person> personList = new ArrayList<Person>();
		
		for (int i = 0; i < 30; i++) {
			personList.add(new Person(i, "wang" + i, 18 + i));
		}
		
		return personList;
	}
	
	private List<Person> parserXmlFromLocal() {
		try {
			File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
			FileInputStream fis = new FileInputStream(path);
			
			// 获得pull解析器对象
			XmlPullParser parser = Xml.newPullParser();
			// 指定解析的文件和编码格式
			parser.setInput(fis, "utf-8");
			
			int eventType = parser.getEventType(); 		// 获得事件类型
			
			List<Person> personList = null;
			Person person = null;
			String id;
			while(eventType != XmlPullParser.END_DOCUMENT) {
				String tagName = parser.getName();	// 获得当前节点的名称
				
				switch (eventType) {
				case XmlPullParser.START_TAG: 		// 当前等于开始节点  <person>
					if("persons".equals(tagName)) {	// <persons>
						personList = new ArrayList<Person>();
					} else if("person".equals(tagName)) { // <person id="1">
						person = new Person();
						id = parser.getAttributeValue(null, "id");
						person.setId(Integer.valueOf(id));
					} else if("name".equals(tagName)) { // <name>
						person.setName(parser.nextText());
					} else if("age".equals(tagName)) { // <age>
						person.setAge(Integer.parseInt(parser.nextText()));
					}
					break;
				case XmlPullParser.END_TAG:		// </persons>
					if("person".equals(tagName)) {
						// 需要把上面设置好值的person对象添加到集合中
						personList.add(person);
					}
					break;
				default:
					break;
				}
				
				eventType = parser.next();		// 获得下一个事件类型
			}
			return personList;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}


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