1.android下junit测试框架配置单元测试需要在手机中进行安装测试(1).在清单文件中manifest节点下配置如下节点 <instrumentation  android:name="android.test.InstrumentationTestRunner"  android:targetPackage="com.example.demo1" />上面targetPackage指定的包要和应用的package相同。(2)在清单文件中application节点下配置如下节点<uses-library  android:name="android.test.runner"/>(3).编写业务逻辑类package com.example.demo1.service;public class UserService {    public int add(int x, int y) {        return x + y;    }}(4).编写单元测试类，该类继承 AndroidTestCase package com.example.demo1.test;import com.example.demo1.service.UserService;import android.test.AndroidTestCase;public class TestUserService extends AndroidTestCase {    public void testAdd() throws Exception {        UserService us = new UserService();        int result = us.add(3, 5);        assertEquals(8, result);    }}选择要测试的方法，右键点击“Run As”--“Android Junit Test” 2.保存文件到手机内存<?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="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="请输入用户名" />    <EditText        android:id="@+id/et_username"        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <requestFocus />    </EditText>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="请输入密码" />    <EditText        android:id="@+id/et_password"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="textPassword" />    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content" >        <CheckBox            android:id="@+id/cb_remember_psw"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:checked="true"            android:text="记住密码" />        <Button            android:onClick="login"            android:layout_alignParentRight="true"            android:id="@+id/login"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="登录" />    </RelativeLayout></LinearLayout>package com.example.demo1;import java.util.HashMap;import com.example.demo1.service.LoginService;import android.app.Activity;import android.os.Bundle;import android.text.TextUtils;import android.view.View;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class LoginUIActivity extends Activity {    private EditText et_username = null;    private EditText et_password = null;    private CheckBox cb_remeber_password = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login_ui);        this.et_username = (EditText) this.findViewById(R.id.et_username);        this.et_password = (EditText) this.findViewById(R.id.et_password);        this.cb_remeber_password = (CheckBox) this.findViewById(R.id.cb_remember_psw);        HashMap<String, String> info = LoginService.getInfo(this);        if (info != null) {            this.et_username.setText(info.get("username"));            this.et_password.setText(info.get("password"));        }    }    public void login(View view) {        String username = this.et_username.getText().toString().trim();        String password = this.et_password.getText().toString().trim();        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            Toast.makeText(this, "用户名或密码不能为空", 0).show();        } else {            if (this.cb_remeber_password.isChecked()) {                boolean result = LoginService.saveInfo(this, username, password);                if (result) {                    Toast.makeText(this, "保存密码成功", 0).show();                }            }            if ("weijie".equals(username) && "123".equals(password)) {                Toast.makeText(this, "登录成功", 0).show();            } else {                Toast.makeText(this, "登录失败", 0).show();            }        }    }}package com.example.demo1.service;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 android.content.Context;import android.widget.Toast;public class LoginService {    public static boolean saveInfo(Context context, String username,            String password) {        // getFileDir : /data/data/包名/files        // getCacheDir : /data/data/包名/cache        File file = new File(context.getFilesDir(), "info.txt");        try {            FileOutputStream fos = new FileOutputStream(file);            fos.write((username + "=" + password).getBytes());            fos.flush();            fos.close();            return true;        } catch (Exception e) {            e.printStackTrace();            return false;        }    }    public static HashMap<String, String> getInfo(Context context) {        File file = new File(context.getFilesDir(), "info.txt");        try {            if (file.exists()) {                FileInputStream fis = new FileInputStream(file);                BufferedReader br = new BufferedReader(new InputStreamReader(fis));                String[] result = br.readLine().split("=");                HashMap<String, String> map = new HashMap<String, String>();                map.put("username", result[0]);                map.put("password", result[1]);                br.close();                return map;            }        } catch (Exception e) {            Toast.makeText(context, "无法读取用户信息", 0).show();        }        return null;    }}3.android下文件访问的权限利用Context提供的参数，我们可以设置文件不同访问权限Context.MODE_PRIVATE：为默认操作模式，代表该文件是私有数据，只能被应用本身访问，在该模式下，写入的内容会覆盖原文件的内容，如果想把新写入的内容追加到原文件中。可以使用Context.MODE_APPENDContext.MODE_APPEND：模式会检查文件是否存在，存在就往文件追加内容，否则就创建新文件。Context.MODE_WORLD_READABLE和Context.MODE_WORLD_WRITEABLE用来控制其他应用是否有权限读写该文件。MODE_WORLD_READABLE：表示当前文件可以被其他应用读取；MODE_WORLD_WRITEABLE：表示当前文件可以被其他应用写入。如果希望文件被其他应用读和写，可以传入： openFileOutput("info.txt", Context.MODE_WORLD_READABLE + Context.MODE_WORLD_WRITEABLE);

4.保存文件到SD卡package com.example.demo1.service;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 android.content.Context;import android.os.Environment;import android.widget.Toast;public class LoginService1 {    public static boolean saveInfo(Context context, String username,            String password) {        try {            if (Environment.MEDIA_MOUNTED.equals(Environment                    .getExternalStorageState())) {                File file = new File(Environment.getExternalStorageDirectory(),                        "info.txt");                FileOutputStream fos = new FileOutputStream(file);                fos.write((username + "=" + password).getBytes());                fos.flush();                fos.close();                return true;            } else {                Toast.makeText(context, "cdcard被卸载", 0).show();                return false;            }        } catch (Exception e) {            e.printStackTrace();            return false;        }    }    public static HashMap<String, String> getInfo(Context context) {        File file = new File(Environment.getExternalStorageDirectory(),                "info.txt");        try {            FileInputStream fis = new FileInputStream(file);            BufferedReader br = new BufferedReader(new InputStreamReader(fis));            String[] result = br.readLine().split("=");            HashMap<String, String> map = new HashMap<String, String>();            map.put("username", result[0]);            map.put("password", result[1]);            br.close();            return map;        } catch (Exception e) {            Toast.makeText(context, "无法读取用户信息", 0).show();        }        return null;    }} <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>5.分析setting源代码获取SD卡大小public String getSdcardInfo() {        File path = Environment.getExternalStorageDirectory();        StatFs stat = new StatFs(path.getPath());        long blockSize = stat.getBlockSize();        long totalBlocks = stat.getBlockCount();        long availableBlocks = stat.getAvailableBlocks();        long totalSize = blockSize * totalBlocks;        long availSize = blockSize * availableBlocks;        String totalStr = Formatter.formatFileSize(LoginUIActivity.this,                totalSize);        String availStr = Formatter.formatFileSize(LoginUIActivity.this,                availSize);        return "cdcard总内存：" + totalStr + "\n" + "可用内存：" + availStr;    }    public String getROMInfo() {        File path = Environment.getDataDirectory();        StatFs stat = new StatFs(path.getPath());        long blockSize = stat.getBlockSize();        long totalBlocks = stat.getBlockCount();        long availableBlocks = stat.getAvailableBlocks();        long totalSize = blockSize * totalBlocks;        long availSize = blockSize * availableBlocks;        String totalStr = Formatter.formatFileSize(LoginUIActivity.this,                totalSize);        String availStr = Formatter.formatFileSize(LoginUIActivity.this,                availSize);        return "手机总内存：" + totalStr + "\n" + "可用内存：" + availStr;    }    6.使用SharedPreferences进行数据存储(1)保存信息,会生成config.xml文件，一般用来保存配置信息的SharedPreferences sp = context.getSharedPreferences("config", Context.MODE_PRIVATE);Editor editor = sp.edit();editor.putString("username", username);editor.putString("password", password);editor.commit();(2)获取信息SharedPreferences sp = context.getSharedPreferences("config", Context.MODE_PRIVATE);sp.getString("username", "");sp.getString("password", "");7.使用Pull解析器生成XML文件public void save(View view) {        XmlSerializer xmlSerializer = Xml.newSerializer();        File file = new File(Environment.getExternalStorageDirectory(),                "config.xml");        try {            FileOutputStream fos = new FileOutputStream(file);            xmlSerializer.setOutput(fos, "utf-8");            xmlSerializer.startDocument("utf-8", true);            xmlSerializer.startTag(null, "smss");            for (SmsInfo info : infos) {                xmlSerializer.startTag(null, "sms");                xmlSerializer.attribute(null, "id", info.getId() + "");                xmlSerializer.startTag(null, "date");                xmlSerializer.text(info.getDate() + "");                xmlSerializer.endTag(null, "date");                xmlSerializer.startTag(null, "address");                xmlSerializer.text(info.getAddress());                xmlSerializer.endTag(null, "address");                xmlSerializer.startTag(null, "body");                xmlSerializer.text(info.getBody());                xmlSerializer.endTag(null, "body");                xmlSerializer.endTag(null, "sms");            }            xmlSerializer.endTag(null, "smss");            xmlSerializer.endDocument();            fos.close();            Toast.makeText(this, "保存成功", 0).show();        } catch (Exception e) {            e.printStackTrace();            Toast.makeText(this, "保存失败", 0).show();        }    }8.采用pull解析器解析xml文件(1).准备一个xml文件，将其拷贝到工程的src目录下<?xml version="1.0" encoding="utf-8"?><infos><city id="1"><temp>20‘C/30‘C</temp><weather>多云</weather><wind>南风3级</wind><name>上海</name><pm>200</pm></city><city id="2"><temp>20‘C/35‘C</temp><weather>暴雨</weather><wind>南风10级</wind><name>北京</name><pm>800</pm></city><city id="3"><temp>0‘C/10‘C</temp><weather>暴雪</weather><wind>北风32级</wind><name>广州</name><pm>200</pm></city></infos>(2)public static ArrayList<WeatherInfo> getWeatherInfo(InputStream is)throws Exception {ArrayList<WeatherInfo> infos = null;WeatherInfo info = null;// XmlPullParser parser = Xml.newPullParser();XmlPullParserFactory fac = XmlPullParserFactory.newInstance();XmlPullParser parser = fac.newPullParser();parser.setInput(is, "utf-8");int type = parser.getEventType();while (type != XmlPullParser.END_DOCUMENT) {switch (type) {case XmlPullParser.START_TAG:if ("infos".equals(parser.getName())) {infos = new ArrayList<WeatherInfo>();} else if ("city".equals(parser.getName())) {info = new WeatherInfo();info.setId(Integer.parseInt(parser.getAttributeValue(0)));} else if ("temp".equals(parser.getName())) {info.setTemp(parser.nextText());} else if ("weather".equals(parser.getName())) {info.setWeather(parser.nextText());} else if ("wind".equals(parser.getName())) {info.setWind(parser.nextText());} else if ("name".equals(parser.getName())) {info.setName(parser.nextText());} else if ("pm".equals(parser.getName())) {info.setPm(parser.nextText());}break;case XmlPullParser.END_TAG:if ("city".equals(parser.getName())) {infos.add(info);info = null;}break;}type = parser.next();}return infos;}(3).调用public class WeatherActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);TextView tv_info = (TextView) this.findViewById(R.id.vt_info);try {ArrayList<WeatherInfo> infos = WeaterService.getWeatherInfo(WeatherActivity.class.getClassLoader().getResourceAsStream("weather.xml"));StringBuffer sb = new StringBuffer();for (WeatherInfo info : infos) {sb.append(info);sb.append("\n");}tv_info.setText(sb.toString());} catch (Exception e) {e.printStackTrace();Toast.makeText(this, "xml解析失败", 0).show();}}}9.android下创建一个sqlite数据库public class PersonSQLiteOpenHelper extends SQLiteOpenHelper {private static final String DBFILENAME = "person.db";private static int db_version = 2;public PersonSQLiteOpenHelper(Context context) {super(context, DBFILENAME, null, db_version);}/*** 当数据库第一次创建时调用*/@Overridepublic void onCreate(SQLiteDatabase db) {String sql = "create table person(id integer primary key autoincrement,name varchar(20),number varchar(20))";db.execSQL(sql);}/*** 当数据库的版本号发生增加的时候调用*/@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {System.out.println("数据库更改！");String sql = "alter table person add account varchar(20)";db.execSQL(sql);}}10.sql语句实现数据库的增删改查(1)添加条目public void add(String name, String number) {SQLiteDatabase db = this.helper.getWritableDatabase();db.execSQL("insert into person(name,number) values(?,?)", new Object[] {name, number });db.close();}(2).查找条目是否存在public boolean find(String name) {SQLiteDatabase db = this.helper.getReadableDatabase();Cursor cursor = db.rawQuery("select * from person where name=?",new String[] { name });boolean result = cursor.moveToNext();cursor.close();db.close();return result;}(3).更新条目public void update(String name, String newNumber) {SQLiteDatabase db = this.helper.getWritableDatabase();db.execSQL("update person set number=? where name=?", new Object[] {newNumber, name });db.close();}(4).删除条目public void delete(String name) {SQLiteDatabase db = this.helper.getWritableDatabase();db.execSQL("delete from person where name=?", new Object[] { name });db.close();}(5).查找所有条目public ArrayList<Person> findAll() {SQLiteDatabase db = this.helper.getReadableDatabase();ArrayList<Person> persons = new ArrayList<Person>();Cursor cursor = db.rawQuery("select * from person", null);while (cursor.moveToNext()) {int id = cursor.getInt(cursor.getColumnIndex("id"));String name = cursor.getString(cursor.getColumnIndex("name"));String number = cursor.getString(cursor.getColumnIndex("number"));Person p = new Person(id, name, number);persons.add(p);}cursor.close();db.close();return persons;}11.系统api实现数据库的增删改查&sqlite3工具的使用(1).添加条目public long add(String name, String number) {SQLiteDatabase db = this.helper.getWritableDatabase();ContentValues values = new ContentValues();values.put("name", name);values.put("number", number);long id = db.insert("person", null, values);db.close();return id;}(2).查找条目是否存在public boolean find(String name) {SQLiteDatabase db = this.helper.getReadableDatabase();Cursor cursor = db.query("person", null, "name=?",new String[] { name }, null, null, null);boolean result = cursor.moveToNext();cursor.close();db.close();return result;}(3).更新条目public int update(String name, String newNumber) {SQLiteDatabase db = this.helper.getWritableDatabase();ContentValues values = new ContentValues();values.put("number", newNumber);int number = db.update("person", values, "name=?",new String[] { name });db.close();return number;}(4).删除条目public int delete(String name) {SQLiteDatabase db = this.helper.getWritableDatabase();// db.execSQL("delete from person where name=?", new Object[] { name });int number = db.delete("person", "name=?", new String[] { name });db.close();return number;}(5).查找所有条目public ArrayList<Person> findAll() {SQLiteDatabase db = this.helper.getReadableDatabase();ArrayList<Person> persons = new ArrayList<Person>();Cursor cursor = db.query("person", null, null, null, null, null, null);while (cursor.moveToNext()) {int id = cursor.getInt(cursor.getColumnIndex("id"));String name = cursor.getString(cursor.getColumnIndex("name"));String number = cursor.getString(cursor.getColumnIndex("number"));Person p = new Person(id, name, number);persons.add(p);}cursor.close();db.close();return persons;}

12.使用事务操作SQLite数据库SQLiteDatabase db =  this.helper.getReadableDatabase();db.beginTransaction();//开始事务try {    db.execSQL("insert into person(name, age) values(?,?)", new Object[]{"张三", 4});    db.execSQL("update person set name=? where personid=?", new Object[]{"李四", 1});    db.setTransactionSuccessful();//调用此方法会在执行到endTransaction() 时提交当前事务，如果不调用此方法会回滚事务} finally {    db.endTransaction();//由事务的标志决定是提交事务，还是回滚事务} db.close();