android读取联系人的问题？读不到mimetype_id：报错

public void click(View view){
		Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
		Uri dataUri = Uri.parse("content://com.android.contacts/data");
		ContentResolver resolver = getContentResolver();
		
		Cursor cursor = resolver.query(uri, null, null, null, null);
		StringBuilder sb = new StringBuilder();
		while(cursor.moveToNext()){
			String contact_id = cursor.getString(cursor.getColumnIndex("contact_id"));
		//	Log.i(TAG,"contact_id-----------------" + contact_id);
			Cursor dataCursor = resolver.query(dataUri, null, "contact_id=?", new String[]{contact_id} , null);
			String name = "";
			String number = "";
			while(dataCursor.moveToNext()){
				int mimetypeId = dataCursor.getInt(dataCursor.getColumnIndex("mimetype_id"));
				//String mimetypeId = dataCursor.getString(dataCursor.getColumnIndex("mimetype"));
				Log.i(TAG,"mimetype" + mimetypeId);
				String data1 = dataCursor.getString(dataCursor.getColumnIndex("data1"));
				if( mimetypeId == 7){
					name = data1;
				}else if(mimetypeId == 5){
					number = data1 ;
				}
			}
			sb.append("name:" + name + "number:" + number);
			dataCursor.close();
		}
		Log.i(TAG, sb.toString());
		cursor.close();
	}

为什么

int mimetypeId = dataCursor.getInt(dataCursor.getColumnIndex("mimetype_id"));

一般出这个错误，都是因为表中没有这个字段。而我前面dataUri查询的是data表，实际上查询的是view_data视图，但是不管data表还是view_data视图，都有mimetype_id,怎么会查不出呢？而mimetype可以查出来，data表中没有这个字段，view_data视图中有这个，这个可以查出来

还有个问题，就是用读出来的联系人会和实际的数量不一样呢？？