扣丁学堂——ContentProvide

一丶源码见本文

二丶本节代码只是一个ContentProvide的测试就不上演示效果

三丶课程讲解

/**
 * 实体对象
 */
public class Person {

    private int id;
    private String name;
    private int age;

    public Person() {
    }

    public Person(int age, String name) {
        this.age = age;
        this.name = name;
    }

    public Person(int age, int id, String name) {
        this.age = age;
        this.id = id;
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    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;
    }

    @Override
    public String toString() {
        return "Person{" +
                "age=" + age +
                ", id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

/**
 * 定义元数据
 */
public final class PersonMetaData {

    public static abstract class Person implements BaseColumns {
        public static final String NAME = "name";
        public static final String AGE = "age";
        public static final String TABLE_NAME = "person";
    }

}

这里直接把DatabaseHelp直接写在了DatabaseAdapter里面

/**
 *  数据库操作
 */
public class DatabaseAdapter {
    private DatabaseHelper dbHelper;


    public DatabaseAdapter(Context context) {
        this.dbHelper = new DatabaseHelper(context);
    }


    public void save(Person person) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(PersonMetaData.Person.NAME, person.getName());
        values.put(PersonMetaData.Person.AGE, person.getAge());
        db.insert(PersonMetaData.Person.TABLE_NAME, null, values);
    }


    public void delete(int id) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        String whereClause = PersonMetaData.Person._ID + "=?";
        String[] whereArgs = {String.valueOf(id)};

        db.delete(PersonMetaData.Person.TABLE_NAME, whereClause, whereArgs);

    }


    public void update(Person person) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(PersonMetaData.Person.NAME, person.getName());
        values.put(PersonMetaData.Person.AGE, person.getAge());
        String whereClause = PersonMetaData.Person._ID + "=?";
        String[] whereArgs = {String.valueOf(person.getId())};

        db.update(PersonMetaData.Person.TABLE_NAME, values, whereClause, whereArgs);
    }


    public ArrayList<Person> findAll() {
        SQLiteDatabase db = dbHelper.getReadableDatabase();
        Cursor c = db.query(true, PersonMetaData.Person.TABLE_NAME, null, null, null, null, null, null, null);

        ArrayList<Person> list = new ArrayList<>();
        Person p = null;
        while (c.moveToNext()) {
            p = new Person();
            p.setName(c.getString(c.getColumnIndexOrThrow(PersonMetaData.Person.NAME)));
            p.setAge(c.getInt(c.getColumnIndexOrThrow(PersonMetaData.Person.AGE)));
            p.setId(c.getInt(c.getColumnIndexOrThrow(PersonMetaData.Person._ID)));

            list.add(p);
        }

        db.close();
        return list;
    }


    public Person findById(int id) {
        SQLiteDatabase db = dbHelper.getReadableDatabase();
        Cursor c = db.query(PersonMetaData.Person.TABLE_NAME, null, PersonMetaData.Person._ID + "=?", new String[]{String.valueOf(id)}, null, null, null, null);

        Person p = new Person();
        if (c.moveToNext()) {
            p.setId(c.getInt(c.getColumnIndexOrThrow(PersonMetaData.Person._ID)));
            p.setName(c.getString(c.getColumnIndexOrThrow(PersonMetaData.Person.NAME)));
            p.setAge(c.getInt(c.getColumnIndexOrThrow(PersonMetaData.Person.AGE)));
        }
        db.close();
        return p;

    }


    private static class DatabaseHelper extends SQLiteOpenHelper {
        private static final String DB_NAME = "cp.db";
        private static final int VERSION = 1;

        private static final String CREATE_TABLE = "create table person(_id integer primary key autoincrement,name text,age int)";

        private static final String DROP_TABLE = "drop table if exists person";


        public DatabaseHelper(Context context) {
            super(context, DB_NAME, null, VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(CREATE_TABLE);
            db.close();

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

            db.execSQL(DROP_TABLE);
            db.execSQL(CREATE_TABLE);
            db.close();
        }
    }
}

/**
 * 自定义 ContentProvider
 */
public class HellowContentProvider extends ContentProvider {
    //匹配码
    private static final int MUTIPLE_CODE = 1;//返回多个记录的匹配码
    private static final int SINGLE_CODE = 2; //返回单个记录的匹配码


    //远程要访问的地址 主机号，别人访问时的路径
    private static final String AUTHORITIES = "com.example.jin.contentp.hellowContentprovider";

    //创建一个uri 的匹配器（定义传入的uri正确的格式）   UriMatcher.NO_MATCH:编码号,uri匹配对时，就返回一个编码号
    private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);

    /**
     * 数据类型
     * text/plain image/jpg
     *
     * 1.单个的数据类型
     *
     *
     * 2.多个的数据类型
     */
    private static final String SINGLE_TYPE = "vnd.android.cursor.item/person";
    private static final String MUTIPLE_TYPE = "vnd.android.cursor.dir/person";

    static {
        /**
         * 当传入的数径是:
         * content://com.example.jin.contentp.hellowContentprovider/person   后面没有编号，则查询所有，
         * 就进行匹配
         *
         *content://com.example.jin.contentp.hellowContentprovider/person/1    1表示person表的id号，也可以传其它条件
         *
         * 路径，表，返回的编号
         */
        URI_MATCHER.addURI(AUTHORITIES, "person", 1);//路么匹配对，则返回1
        URI_MATCHER.addURI(AUTHORITIES, "person/#", 2);// *：匹配所有的字符， #：匹配所有的数字 匹配上，则返回2
    }


    //数据库帮助类
    private DatabaseAdapter.DatabaseHelper dbAdapter;

    /**
     * 创建
     *
     * @return
     */
    @Override
    public boolean onCreate() {
        //数据库帮助类对象
        dbAdapter = new DatabaseAdapter.DatabaseHelper(getContext());
        return true;
    }


    /**
     * 返回该URi 表示的数据类型
     *
     * @param uri
     * @return
     */
    @Override
    public String getType(Uri uri) {
        switch (URI_MATCHER.match(uri)) {
            case SINGLE_CODE:
                return SINGLE_TYPE;
            case MUTIPLE_CODE:
                return MUTIPLE_TYPE;
        }

        return null;
    }


    /**
     * 插入一个新的记录
     * <p/>
     * 传入的 uri
     * content://com.example.jin.contentp.hellowContentprovider/person/4
     *
     * @param uri
     * @param values
     * @return
     */
    @Override
    public Uri insert(Uri uri, ContentValues values) {
        switch (URI_MATCHER.match(uri)) {
            case MUTIPLE_CODE:
                //数据库操作对象，进行保存操作
                SQLiteDatabase db = dbAdapter.getWritableDatabase();

                //当前插入的id值
                long id = db.insert(PersonMetaData.Person.TABLE_NAME, null, values);
                db.close();
                //将id 添加到 uri后面
                ContentUris.withAppendedId(uri, id);
                break;
        }

        return uri;
    }


    /**
     * 查询符合指定条件的记录
     *
     * @param uri
     * @param projection    //列
     * @param selection
     * @param selectionArgs
     * @param sortOrder
     * @return
     */
    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        switch (URI_MATCHER.match(uri)) {
            case SINGLE_CODE:
                SQLiteDatabase db = dbAdapter.getWritableDatabase();

                //从 uri 中获取id
                long id = ContentUris.parseId(uri);
                //条件
                selection = PersonMetaData.Person._ID + "=?";
                //条件值
                selectionArgs = new String[]{String.valueOf(id)};
                return db.query(PersonMetaData.Person.TABLE_NAME, projection, selection, selectionArgs, null, null, sortOrder);
            case MUTIPLE_CODE:
                db = dbAdapter.getWritableDatabase();
                return db.query(PersonMetaData.Person.TABLE_NAME, projection, selection, selectionArgs, null, null, sortOrder);
        }


        return null;
    }

    /**
     * 删除符合指定条件的记录
     * <p/>
     * <p/>
     * content://com.example.jin.contentp.hellowContentprovider/person/4
     *
     * @param uri
     * @param selection
     * @param selectionArgs
     * @return
     */
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        switch (URI_MATCHER.match(uri)) {
            case SINGLE_CODE://单个删除
                SQLiteDatabase db = dbAdapter.getWritableDatabase();

                //从 uri 中获取id
                long id = ContentUris.parseId(uri);
                //条件
                selection = PersonMetaData.Person._ID + "=?";
                //条件值
                selectionArgs = new String[]{String.valueOf(id)};

                //需要得到传入的id号即可
                int row = db.delete(PersonMetaData.Person.TABLE_NAME, selection, selectionArgs);
                db.close();
                return row;//返回删除的行数
            case MUTIPLE_CODE://多个删除
                db = dbAdapter.getWritableDatabase();

                //需要得到传入的id号即可
                row = db.delete(PersonMetaData.Person.TABLE_NAME, selection, selectionArgs);
                db.close();
                return row;
        }
        return 0;
    }

    /**
     * 更新指定条件的记录
     *
     * @param uri
     * @param values
     * @param selection
     * @param selectionArgs
     * @return
     */
    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {

        switch (URI_MATCHER.match(uri)) {
            case SINGLE_CODE://单个更新
                SQLiteDatabase db = dbAdapter.getWritableDatabase();

                //从 uri 中获取id
                long id = ContentUris.parseId(uri);
                //条件
                selection = PersonMetaData.Person._ID + "=?";
                //条件值
                selectionArgs = new String[]{String.valueOf(id)};

                //需要得到传入的id号即可
                int row = db.update(PersonMetaData.Person.TABLE_NAME, values, selection, selectionArgs);
                db.close();
                return row;//返回更新的行数
            case MUTIPLE_CODE://多个更新
                db = dbAdapter.getWritableDatabase();

                //需要得到传入的id号即可
                row = db.update(PersonMetaData.Person.TABLE_NAME, values, selection, selectionArgs);
                db.close();
                return row;
        }
        return 0;
    }
}

//activity类
public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    public void addClick(View view) {
        //获取 内容提供者的接口
        ContentResolver cr = this.getContentResolver();

        //调用CP的添加方法
        Uri uri = Uri.parse("content://com.example.jin.contentp.hellowContentprovider/person"); //要去访问ContentProvider

        ContentValues values = new ContentValues();
        values.put(PersonMetaData.Person.NAME, "zhang"); //如果在其它工程中写成字符串，其它一样
        values.put(PersonMetaData.Person.AGE, 18);
        //调用ContentProvider的方法进行添加
        cr.insert(uri, values);
    }


    public void queryClick(View view) {
        ContentResolver cr = this.getContentResolver();

        Uri uri = Uri.parse("content://com.example.jin.contentp.hellowContentprovider/person"); //要去访问ContentProvider,带ID号

        Cursor cursor = cr.query(uri, null, null, null, null);

        while (cursor.moveToNext()) {
            System.out.print(cursor.getInt(cursor.getColumnIndexOrThrow(PersonMetaData.Person._ID)));
            System.out.print(cursor.getString(cursor.getColumnIndexOrThrow(PersonMetaData.Person.NAME)));
            System.out.print(cursor.getInt(cursor.getColumnIndexOrThrow(PersonMetaData.Person.AGE)));
        }
        cursor.close();

    }

    public void delClick(View view) {

        ContentResolver cr = this.getContentResolver();

        Uri uri = Uri.parse("content://com.example.jin.contentp.hellowContentprovider/person/1"); //要去访问ContentProvider,带ID号

        cr.delete(uri, null, null);

    }

    public void updateClick(View view) {

        ContentResolver cr = this.getContentResolver();

        Uri uri = Uri.parse("content://com.example.jin.contentp.hellowContentprovider/person/1"); //要去访问ContentProvider,带ID号

        ContentValues values = new ContentValues();
        values.put(PersonMetaData.Person.NAME, "zhang");
        values.put(PersonMetaData.Person.AGE, 20);

        cr.update(uri, values, null, null);
    }
}

//配置清单
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>


        <provider
            android:authorities="com.example.jin.contentp.hellowContentprovider"
            android:name=".HellowContentProvider"

            />
    </application>

/**
 * 添加联系人
 */
public class ContactsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contacts);
    }


    /**
     * 添加联系人
     * @param view
     */
    public void addClick(View view) {
        ContentResolver cr = this.getContentResolver();
        //执行一个空值插入，目的是获取系统返回的rawContactId
        ContentValues values = new ContentValues();
        Uri uri = cr.insert(ContactsContract.RawContacts.CONTENT_URI, values);//在contacts表中插入一行空列
        long _id = ContentUris.parseId(uri);//获取插入的id

        //插入姓名数据
        values.clear();
        values.put(ContactsContract.Data.RAW_CONTACT_ID, _id);//在 data 表中插入id
        values.put(ContactsContract.Data.MIMETYPE,
                ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE);
        values.put(ContactsContract.CommonDataKinds.StructuredName.DISPLAY_NAME, "jack");
        cr.insert(ContactsContract.Data.CONTENT_URI, values);

        //插入电话数据
        values.clear();
        values.put(ContactsContract.Data.RAW_CONTACT_ID, _id);
        values.put(ContactsContract.Data.MIMETYPE,
                ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE);

        values.put(ContactsContract.CommonDataKinds.Phone.NUMBER, "00900");
        values.put(ContactsContract.CommonDataKinds.Phone.TYPE,
                ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE);

        cr.insert(ContactsContract.Data.CONTENT_URI, values);

        Toast.makeText(this, "记录已添加", Toast.LENGTH_LONG).show();
    }


    /**
     * 删除联系人
     * @param view
     */
    public void deleteClick(View view) {
        ContentResolver cr = this.getContentResolver();
        System.out.print(ContactsContract.Contacts.CONTENT_URI.toString() + "/3");
        Uri uri = Uri.parse("content://com.android.contacts/contacts/3");

        cr.delete(uri, null, null);
        Toast.makeText(this, "记录已删除", Toast.LENGTH_SHORT).show();
    }

    /**
     * 更新联系人
     * @param vied
     */
    public void updateClick(View vied) {
        ContentResolver cr = this.getContentResolver();
        ContentValues values = new ContentValues();

        values.put(ContactsContract.Data.MIMETYPE,
                ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE);

        values.put(ContactsContract.CommonDataKinds.Phone.NUMBER, "4445");
        values.put(ContactsContract.CommonDataKinds.Phone.TYPE,
                ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE);

        cr.update(ContactsContract.Data.CONTENT_URI, values, "_id=1", null);
        Toast.makeText(this, "_id=1的记录已更新", Toast.LENGTH_SHORT).show();
    }

    //查询联系人
    public void queryClick(View view) {
        //获取接口
        ContentResolver contentResolver = this.getContentResolver();
        String id = null;
        String mimeType = null;

        //只需要从Contacts中获取Id,其他的都可以不要，通过查看上面编译的SQL语句，可以看出将第二个参数
        //设置为Null ，默认返回的列非常多，是一种资源浪费
        //查询 contacts表 查询出 id号
        Cursor cursor = contentResolver.query(ContactsContract.Contacts.CONTENT_URI, new String[]{ContactsContract.Contacts._ID}, null, null, null);

        while (cursor.moveToNext()) {
            id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            //从一个cursor获取所有的信息
            //查询 data表 查询 id,
            Cursor contactInfoCursor = contentResolver.query(
                    ContactsContract.Data.CONTENT_URI,

                    new String[]{ContactsContract.Data.CONTACT_ID,//查询联系人的id
                            ContactsContract.Data.MIMETYPE,//类型
                            ContactsContract.Data.DATA1,//名字等信息
                            ContactsContract.Data.DATA15},//图片

                    ContactsContract.Data.CONTACT_ID + "=" + id,
                    null, null);

            while (contactInfoCursor.moveToNext()) {
                mimeType = contactInfoCursor.getString(
                        contactInfoCursor.getColumnIndex(ContactsContract.Data.MIMETYPE));

                String value = contactInfoCursor.getString(
                        contactInfoCursor.getColumnIndex(ContactsContract.Data.DATA1));
                byte[] photo = contactInfoCursor.getBlob(
                        contactInfoCursor.getColumnIndex(ContactsContract.Data.DATA15));

                if (mimeType.contains("/name")) {
                    System.out.print("姓名=" + value);
                } else if (mimeType.contains("/email")) {
                    System.out.print("邮箱=" + value);
                } else if (mimeType.contains("/im")) {
                    System.out.print("聊天QQ账号=" + value);
                } else if (mimeType.contains("/phone")) {
                    System.out.print("电话=" + value);
                } else if (mimeType.contains("/postal")) {
                    System.out.print("邮编=" + value);
                } else if (mimeType.contains("/photo")) {
                    System.out.print("照片=" + photo);//图片使用ImageView来显示
                } else if (mimeType.contains("/group")) {
                    System.out.print("组=" + value);
                } else if (mimeType.contains("/postal-address_v2")) {
                    System.out.print("地址=" + value);
                }
            }
            contactInfoCursor.close();
        }
        cursor.close();
    }
}