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);    }@Overridepublic 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>

android下Junit

冒烟测试:

adbshellmonkey-p<程序的包名>-v<事件的数量>

android下单元测试:

在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-libraryandroid: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##123123String 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##123123String 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##123123String 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##123123String 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;@Overrideprotected 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"));}}@Overridepublic 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卡

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 {@Overrideprotected 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 {@Overrideprotected 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/";@Overrideprotected 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 */@Overridepublic 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/itheima28SharedPreferences 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;@Overridepublic 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;}}

更多相关文章

1. Android 文件存储 和 权限管理
2. Android的数据库--sqlite（一）
3. Android开发集锦之二：android中的数据库操作
4. Android创建和使用数据库详细指南
5. android 使用Intent传递数据之全局变量传递
6. Android真响应式架构——数据流动性
7. 处女男学Android（十四）---Android 重量级数据存储之SQLite
8. Android APK权限大全

随机推荐

1. Android输入管理服务启动过程源码分析
2. Android(安卓)studio 学习6：配置Bmob SDK
3. （Android(安卓)Studio 3.0）Android(安卓)Pr
4. Spring系列学习之Spring Android
5. 高德天气应用开发之四：android ViewPager
6. android studio使用错误排查记录
7. Android(安卓)MediaCodec硬编兼容性测试
8. 如何避免android上的进程的内存限制
9. Gradle常见错误解决
10. [android]控件EditText常用属性