Android编程使用内容提供者方式(ContentProvider)进行存储的方法

public class PersonProvider extends ContentProvider {
  //创建工具类实现Uri匹配
  private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
  private static final int PERSOnS= 1;
  private static final int PERSON = 2;
  static{
    MATCHER.addURI("cn.test.providers.personprovider", "person", PERSONS);
    MATCHER.addURI("cn.test.providers.personprovider", "person/#", PERSON);
  }
  private DBOpenHelper dbOpenHelper = null;
  @Override
  public boolean onCreate() {
    dbOpenHelper = new DBOpenHelper(getContext());
    return true;
  }
  @Override
  public Cursor query(Uri uri, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {
    SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
    switch (MATCHER.match(uri)) {
    case PERSONS: // 获取person表中的所有数据  /person
      return db.query("person", projection, selection, selectionArgs, null, null, sortOrder);
    case PERSON: // 获取person表中的指定id的数据 /person/20
      long id = ContentUris.parseId(uri);
      String where = "persOnid="+ id;
      if(selection!=null && !"".equals(selection.trim())){
        where += " and "+ selection;
      }
      return db.query("person", projection, where, selectionArgs, null, null, sortOrder);
    default:
      throw new IllegalArgumentException("Unknown Uri:"+ uri);
    }
  }
  @Override
  public String getType(Uri uri) {
    // TODO Auto-generated method stub
    return null;
  }
  @Override
  public Uri insert(Uri uri, ContentValues values) {
    //取得数据库操作实例
    SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
    switch (MATCHER.match(uri)) {
    case PERSONS:
      //执行添加，返回行号，如果主健字段是自增长的，那么行号会等于主键id
      long rowid = db.insert("person", "name", values);
      //得到拼好的uri
      Uri insertUri = ContentUris.withAppendedId(uri, rowid);
      //发出数据变化通知(person表的数据发生变化)
      getContext().getContentResolver().notifyChange(uri, null);
      return insertUri;
    default:
      //不能识别uri
      throw new IllegalArgumentException("Unknown Uri:"+ uri);
    }
  }
  @Override
  public int delete(Uri uri, String selection, String[] selectionArgs) {
    SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
    //受影响的行数
    int num = 0;
    switch (MATCHER.match(uri)) {
    case PERSONS: // 删除person表中的所有数据  /person
      num = db.delete("person", selection, selectionArgs);
      break;
    case PERSON: // 删除person表中的指定id的数据 /person/20
      long id = ContentUris.parseId(uri);
      String where = "persOnid="+ id;
      if(selection!=null && !"".equals(selection.trim())){
        where += " and "+ selection;
      }
      num = db.delete("person", where, selectionArgs);
      break;
    default:
      throw new IllegalArgumentException("Unknown Uri:"+ uri);
    }
    return num;
  }
  @Override
  public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
    SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
    int num = 0;
    switch (MATCHER.match(uri)) {
    case PERSONS: // 更新person表中的所有数据  /person
      num = db.update("person", values, selection, selectionArgs);
      break;
    case PERSON: // 更新person表中的指定id的数据 /person/20
      long id = ContentUris.parseId(uri);
      String where = "persOnid="+ id;
      if(selection!=null && !"".equals(selection.trim())){
        where += " and "+ selection;
      }
      num = db.update("person", values, where, selectionArgs);
      break;
    default:
      throw new IllegalArgumentException("Unknown Uri:"+ uri);
    }
    return num;
  }
}

public class AccessContentProiderTest extends AndroidTestCase {
  public void testInsert() throws Throwable{
    ContentResolver resolver = getContext().getContentResolver();
    Uri uri = Uri.parse("content://cn.test.providers.personprovider/person");
    ContentValues values = new ContentValues();
    values.put("name", "lili");
    values.put("phone", "110");
    values.put("amount", "3000000000");
    resolver.insert(uri, values);
  }
  public void testDelete() throws Throwable{
    ContentResolver resolver = getContext().getContentResolver();
    Uri uri = Uri.parse("content://cn.test.providers.personprovider/person");
    int num =resolver.delete(uri, null, null);
  }
  public void testUpdate() throws Throwable{
    ContentResolver resolver = getContext().getContentResolver();
    Uri uri = Uri.parse("content://cn.test.providers.personprovider/person/65");
    ContentValues values = new ContentValues();
    values.put("amount", 500);
    resolver.update(uri, values, null, null);
  }
  public void testQuery() throws Throwable{
    ContentResolver resolver = getContext().getContentResolver();
    Uri uri = Uri.parse("content://cn.test.providers.personprovider/person/65");
    Cursor cursor = resolver.query(uri, null, null, null, "personid asc");
    while(cursor.moveToNext()){
      String name = cursor.getString(cursor.getColumnIndex("name"));
      Log.i("AccessContentProviderTest", name);
    }
  }
}