我在Parse.com上有两个类:图片&数据。在Data类中,我保存了3个字段名称,手机号码&职业。在Image类中,我正在保存图像。多对多关系
我必须在这两个类之间创建关系,以便我可以使用相应的手机号码获取图像。一个手机号码可以保存很多图像,而表格Data可以有很多手机号码。
无法找到我怎么能获取的图像与特定的手机号码。请帮助,因为我已经通过文件。提前致谢。这里是我的代码:
public class GetImage extends Activity {
// Declare Variables
GridView gridview;
List<ParseObject> ob;
ProgressDialog mProgressDialog;
GridViewAdapter adapter;
Button imgbtn;
EditText mbltxt;
String mobileNumber;
private List<PhoneList> phonearraylist = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from gridview_main.xml
setContentView(R.layout.listview_main);
// Execute RemoteDataTask AsyncTask
imgbtn=(Button) findViewById(R.id.imgbtn);
mbltxt = (EditText) findViewById(R.id.mbltxt);
imgbtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (mbltxt.getText().toString().equals("")) {
Toast.makeText(getBaseContext(), "Please enter a valid mobilenumber", Toast.LENGTH_LONG).show();
}else {
new RemoteDataTask().execute();
}
}
});
}
请求手机号码后,点击getImage按钮查询该手机号码的所有图像。
// RemoteDataTask AsyncTask
private class RemoteDataTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(GetImage.this);
// Set progressdialog title
mProgressDialog.setTitle("Images");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create the array
phonearraylist = new ArrayList<PhoneList>();
try {
// Locate the class table named "Image" in Parse.com
ParseRelation<ParseObject> relation = currentUser.getRelation("img");
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Image");
ob = query.find();
for (ParseObject imgob : ob) {
ParseFile image = (ParseFile) imgob.get("ImageFile");
PhoneList map = new PhoneList();
map.setPhone(image.getUrl());
phonearraylist.add(map);
}
}catch (ParseException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// Locate the gridview in gridview_main.xml
gridview = (GridView) findViewById(R.id.gridview);
// Pass the results into ListViewAdapter.java
adapter = new GridViewAdapter(GetImage.this,
phonearraylist);
// Binds the Adapter to the ListView
gridview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}}
如果每个Image只有一个手机号码,那么这不是一个多对多的关系,它只是一对多的关系。正如我在其他类似问题中所说的,请勿使用可能会更改的字段链接对象。在解析中,您应该喜欢使用对象引用(例如,'Image'可以有一个名为'relatedData'的属性,您可以将其设置为'Data'记录,这只是存储指向该记录的链接并使查询更容易。 –
你知道如何做到这一点?此外,如果项目是开源的,请做一个链接 – Zen