1.listview入门,自定义的数据适配器<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=".ListViewActivity" >    <ListView        android:id="@+id/lv"        android:layout_width="match_parent"        android:layout_height="match_parent" >    </ListView></RelativeLayout>public class ListViewActivity extends Activity {    private ListView lv;    public String tag = "ListViewActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_list_view);        lv = (ListView) findViewById(R.id.lv);        lv.setAdapter(new MyAdapter());    }        /**     * 自定义的数据适配器     *      * @author Administrator     *      */    private class MyAdapter extends BaseAdapter {        /**         * 控制listview里面有多个条目.         */        @Override        public int getCount() {            return 15;        }        /**         * 返回每个位置对应的view对象         */        @Override        public View getView(int position, View convertView, ViewGroup parent) {            // 这个方法被调用了多少次?            Log.i(tag, "POSITION:" + position);            TextView tv = new TextView(ListViewActivity.this);            tv.setTextSize(30);            tv.setTextColor(Color.RED);            tv.setText("我是第" + position + "个条目");            return tv;        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public long getItemId(int position) {            return 0;        }    }    }2.采用layoutInflater打气筒创建一个view对象在上面的基础上添加list_item.xml<?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="wrap_content"    android:orientation="vertical" >    <TextView        android:id="@+id/tv_name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textColor="#000000" />    <TextView        android:id="@+id/tv_number"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>/** * 返回每个位置对应的view对象 */@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    // 这个方法被调用了多少次?    Log.i(tag, "POSITION:" + position);    View view = View.inflate(getApplicationContext(),            R.layout.list_item, null);    TextView tv_name = (TextView) view.findViewById(R.id.tv_name);    TextView tv_number = (TextView) view.findViewById(R.id.tv_number);    tv_name.setText("name:"+position);    tv_number.setText(position+"");    return view;}3.常用数据适配器ArrayAdapterprotected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_list_view);        lv = (ListView) findViewById(R.id.lv);        lv.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item,                R.id.tv_name, new String[] { "aaaa", "bbbb", "cccc", "ddddd" }));}4.常用数据适配器SimpleAdapterprotected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_list_view);        lv = (ListView) findViewById(R.id.lv);        List<Map<String, String>> data = http://www.mamicode.com/new ArrayList>();        Map<String, String> item1 = new HashMap<String, String>();        item1.put("name", "zhangsna");        item1.put("number", "124245");        Map<String, String> item2 = new HashMap<String, String>();        item2.put("name", "lisi");        item2.put("number", "4545");        data.add(item1);        data.add(item2);        lv.setAdapter(new SimpleAdapter(this, data, R.layout.list_item,                new String[] { "name", "number" }, new int[] { R.id.tv_name,                        R.id.tv_number }));    }    5.使用ContentProvider（内容提供者）共享数据ContentProvider 在android中的作用是对外共享数据，也就是说你可以通过ContentProvider把应用中的数据共享给其他应用访问，其他应用可以通过ContentProvider 对你应用中的数据进行添删改查。如果采用文件操作模式对外共享数据，数据的访问方式会因数据存储的方式而不同，导致数据的访问方式无法统一使用ContentProvider对外共享数据的好处是统一了数据的访问方式。定义一个类继承ContentProvider类package com.itheima.contentprovider;import android.content.ContentProvider;import android.content.ContentUris;import android.content.ContentValues;import android.content.UriMatcher;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.net.Uri;import com.example.demo1.db.PersonSQLiteOpenHelper;public class PersonProvider extends ContentProvider {    // 定义一个uri匹配器，用于匹配uri，如果匹配不成功返回-1    private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);    private static final int INSERT = 1;    private static final int DELETE = 2;    private static final int UPDATE = 3;    private static final int QUERY = 4;    private static final int QUERYONE = 5;    private static final Uri URI = Uri.parse("content://person.db");    private PersonSQLiteOpenHelper helper;    static {        // 添加一组匹配规则        // authority: the authority to match        // path: the path to match. * may be used as a wild card for any text,        // and # may be used as a wild card for numbers.        // code: the code that is returned when a URI is matched against the        // given components. Must be positive.        matcher.addURI("com.itheima.contentprovider.personprovider", "insert",                INSERT);        matcher.addURI("com.itheima.contentprovider.personprovider", "delete",                DELETE);        matcher.addURI("com.itheima.contentprovider.personprovider", "update",                UPDATE);        matcher.addURI("com.itheima.contentprovider.personprovider", "query",                QUERY);        matcher.addURI("com.itheima.contentprovider.personprovider", "query/#",                QUERYONE);    }    @Override    public boolean onCreate() {        this.helper = new PersonSQLiteOpenHelper(getContext());        return false;    }    @Override    public Cursor query(Uri uri, String[] projection, String selection,            String[] selectionArgs, String sortOrder) {        if (matcher.match(uri) == QUERY) {            SQLiteDatabase db = helper.getReadableDatabase();            Cursor cursor = db.query("person", projection, selection,                    selectionArgs, null, null, sortOrder);            // 注意这里的db和cursor不能关闭            return cursor;        } else if (matcher.match(uri) == QUERYONE) {            SQLiteDatabase db = helper.getReadableDatabase();            long id = ContentUris.parseId(uri);            Cursor cursor = db.query("person", projection, "id=?",                    new String[] { id + "" }, null, null, sortOrder);            // 注意这里的db和cursor不能关闭            return cursor;        } else {            throw new IllegalArgumentException("非法uri");        }    }    @Override    public int delete(Uri uri, String selection, String[] selectionArgs) {        if (matcher.match(uri) == DELETE) {            SQLiteDatabase db = helper.getWritableDatabase();            // 注册内容观测者            getContext().getContentResolver().notifyChange(URI, null);            return db.delete("person", selection, selectionArgs);        } else {            throw new IllegalArgumentException("非法uri");        }    }    @Override    public Uri insert(Uri uri, ContentValues values) {        if (matcher.match(uri) == INSERT) {            SQLiteDatabase db = helper.getWritableDatabase();            long id = db.insert("person", null, values);            getContext().getContentResolver().notifyChange(URI, null);            // 返回指定的Uri路劲对象            // content://cn.itcast.provider.custom.usersprovider/users/1            return ContentUris.withAppendedId(uri, id);        } else {            throw new IllegalArgumentException("非法uri");        }    }    @Override    public int update(Uri uri, ContentValues values, String selection,            String[] selectionArgs) {        if (matcher.match(uri) == UPDATE) {            SQLiteDatabase db = helper.getWritableDatabase();            getContext().getContentResolver().notifyChange(URI, null);            return db.update("person", values, selection, selectionArgs);        } else {            throw new IllegalArgumentException("非法uri");        }    }    /**     * Implement this to handle requests for the MIME type of the data at the     * given URI. The returned MIME type should start with     * vnd.android.cursor.item for a single record, or vnd.android.cursor.dir/     * for multiple items. This method can be called from multiple threads, as     * described in Processes and Threads.     */    @Override    public String getType(Uri uri) {        if (matcher.match(uri) == QUERY) {            return "vnd.android.cursor.dir/person";        } else if (matcher.match(uri) == QUERYONE) {            return "vnd.android.cursor.item/person";        } else {            return "";        }    }}定义一个类继承SQLiteOpenHelper类package com.example.demo1.db;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class PersonSQLiteOpenHelper extends SQLiteOpenHelper {    private static final String DBFILENAME = "person.db";    private static int db_version = 1;    public PersonSQLiteOpenHelper(Context context) {        super(context, DBFILENAME, null, db_version);    }    /**     * 当数据库第一次创建时调用     */    @Override    public 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     */    @Override    public 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);    }}清单文件中注册内容提供者<provider android:name="com.itheima.contentprovider.PersonProvider"            android:authorities="com.itheima.contentprovider.personprovider"            ></provider>第三方软件public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void getAll(View view) {        ContentResolver resolver = this.getContentResolver();        Uri uri = Uri                .parse("content://com.itheima.contentprovider.personprovider/query");        Cursor cursor = resolver.query(uri, null, null, null, null);        StringBuffer sb = new StringBuffer();        while (cursor.moveToNext()) {            sb.append(cursor.getString(cursor.getColumnIndex("name")) + " -- "                    + cursor.getString(cursor.getColumnIndex("number")));            sb.append("\n");        }        TextView tv_info = (TextView) this.findViewById(R.id.tv_info);        tv_info.setText(sb.toString());        cursor.close();    }    public void getOne(View view) {        ContentResolver resolver = this.getContentResolver();        // Uri uri = Uri        // .parse("content://com.itheima.contentprovider.personprovider/query");        // Cursor cursor = resolver.query(uri, null, "id=?",new String[]{"1"} ,        // null);        Uri uri = Uri.parse("content://com.itheima.contentprovider.personprovider/query/1");        Cursor cursor = resolver.query(uri, null, null, null, null);        StringBuffer sb = new StringBuffer();        if (cursor.moveToFirst()) {            sb.append(cursor.getString(cursor.getColumnIndex("name")) + " -- "                    + cursor.getString(cursor.getColumnIndex("number")));            sb.append("\n");        }        TextView tv_info = (TextView) this.findViewById(R.id.tv_info);        tv_info.setText(sb.toString());        cursor.close();    }    public void insert(View view) {        ContentResolver resolver = this.getContentResolver();        Uri uri = Uri.parse("content://com.itheima.contentprovider.personprovider/insert");        ContentValues values = new ContentValues();        values.put("name", "reality");        values.put("number", "567");        Uri result = resolver.insert(uri, values);        System.out.println("result = " + result);    }    public void update(View view) {        ContentResolver resolver = this.getContentResolver();        Uri uri = Uri                .parse("content://com.itheima.contentprovider.personprovider/update");        ContentValues values = new ContentValues();        values.put("name", "dog");        values.put("number", "110");        int result = resolver.update(uri, values, "id=?", new String[] { "1" });        System.out.println("result = " + result);    }    public void delete(View view) {        ContentResolver resolver = this.getContentResolver();        Uri uri = Uri                .parse("content://com.itheima.contentprovider.personprovider/delete");        int result = resolver.delete(uri, "id=?", new String[] { "3" });        System.out.println("result = " + result);    }}6.短信的备份public class BackupsmsActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_backupsms);    }    public void backupSMS(View view) {        Uri uri = Uri.parse("content://sms");        ContentResolver resolver = this.getContentResolver();        Cursor cursor = resolver.query(uri, new String[] { "date", "body",                "address", "type" }, null, null, null);        ArrayList<SmsInfo> infos = new ArrayList<SmsInfo>();        while (cursor.moveToNext()) {            long date = cursor.getLong(0);            String body = cursor.getString(1);            String address = cursor.getString(2);            int type = cursor.getInt(3);            SmsInfo smsInfo = new SmsInfo(date, body, address, type);            infos.add(smsInfo);        }        SmsUtil.save(this, infos);    }}public class SmsUtil {    public static void save(Context context, ArrayList<SmsInfo> infos) {        XmlSerializer xmlSerializer = Xml.newSerializer();        File file = new File(Environment.getExternalStorageDirectory(),                "sms_bak.xml");//mnt/sdcard/sms_bak.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, "type", info.getType() + "");                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(context, "保存成功", 0).show();        } catch (Exception e) {            e.printStackTrace();            Toast.makeText(context, "保存失败", 0).show();        }    }}public class SmsInfo {    private int id;    private long date;    private String body;    private String address;    private int type;    public SmsInfo() {        super();        // TODO Auto-generated constructor stub    }    public SmsInfo(int id, long date, String body, String address) {        super();        this.id = id;        this.date = date;        this.body = body;        this.address = address;    }    public SmsInfo(long date, String body, String address, int type) {        super();        this.date = date;        this.body = body;        this.address = address;        this.type = type;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public long getDate() {        return date;    }    public void setDate(long date) {        this.date = date;    }    public String getBody() {        return body;    }    public void setBody(String body) {        this.body = body;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }}7.插入一条记录到系统短信应用public class InsertsmsActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_insertsms);        new Thread() {            public void run() {                try {                    Thread.sleep(10000);                    Uri uri = Uri.parse("content://sms");                    ContentResolver resolver = getContentResolver();                    ContentValues values = new ContentValues();                    values.put("address", "10086");                    values.put("type", 1);                    values.put("date", System.currentTimeMillis());                    values.put("body", "您的余额还有100,000,000元！");                    resolver.insert(uri, values);                } catch (InterruptedException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }.start();    }}<uses-permission android:name="android.permission.READ_SMS" /><uses-permission android:name="android.permission.WRITE_SMS" />