无废话Android之listview入门,自定义的数据适配器、采用layoutInflater打气筒创建一个view对象、常用数据适配器ArrayAdapter、SimpleAdapter、使用ContentProvider（内容提供者）共享数据、短信的备份、插入一条记录到系统短信应用（3）

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
 */
@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);
    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ArrayAdapter
protected 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SimpleAdapter
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_view);
        lv = (ListView) findViewById(R.id.lv);

        List<Map<String, String>> data = new ArrayList<Map<String, String>>();

        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" />