I don't have this in a public repository, so pardon the large post.
This cursor handles JSONObjects of two types: Page and Item. A Page
holds some page information and a JSONArray of Items and Item is a
single item.
---
package com.eyebrowsoftware.gobeering;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.database.AbstractCursor;
import android.os.Bundle;
import android.util.Log;
public class JSONObjectCursor extends AbstractCursor {
private static final String TAG = "JSONObjectCursor";
JSONObject mPage = null;
JSONArray mArray = null;
JSONObject mObject = null;
String[] mProjection;
String[] mKeys;
HashMap<String, String> mProjectionMap;
public JSONObjectCursor(String[] projection, JSONObject jso, String[]
keys,
HashMap<String, String>
projection_map) throws JSONException {
mProjectionMap = projection_map;
mProjection = projection;
mKeys = keys;
if(keys != null && keys.length == 2 && keys[0] != null &
keys[1] !=
null) { // paged list type
// This combination of nulls and non-nulls
mPage =
jso.getJSONObject(GoBeeringProvider.COLLECTION_KEY);
mArray = mPage.getJSONArray(keys[0]);
} else if(keys != null && keys.length == 1 && keys[0] != null) {
// Another combination of nulls and non-nulls
mObject = jso.getJSONObject(keys[0]);
} else {
Log.e(TAG, "Internal Error - Illegal arguement to
JSONObjectCursor:
keys[]");
throw new IllegalArgumentException();
}
}
@Override
public Bundle getExtras() {
if(mPage != null) {
try {
Bundle b = new Bundle();
b.putInt(Pages.Page.PAGE,
mPage.getInt(Pages.Page.PAGE));
b.putInt(Pages.Page.TOTAL_PAGES, mPage.getInt
(Pages.Page.TOTAL_PAGES));
b.putInt(Pages.Page.TOTAL_ENTRIES, mPage.getInt
(Pages.Page.TOTAL_ENTRIES));
b.putInt(Pages.Page.PER_PAGE, 30);
return b;
} catch (JSONException e) {
e.printStackTrace();
return Bundle.EMPTY;
}
} else
return Bundle.EMPTY;
}
@Override
public String[] getColumnNames() {
return mProjection;
}
@Override
public int getCount() {
return (mArray != null) ? mArray.length() : 1;
}
private JSONObject getArrayItem() throws JSONException {
JSONObject item_wrapper =
mArray.getJSONObject(this.getPosition());
return item_wrapper.getJSONObject(mKeys[1]);
}
@Override
public double getDouble(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
return (mArray != null) ? getArrayItem().getDouble(key)
:
mObject.getDouble(key);
} catch (JSONException e) {
e.printStackTrace();
return 0.0;
}
}
@Override
public float getFloat(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return (o.isNull(key)) ? 0 :
Float.valueOf(o.getString(key));
} catch (JSONException e) {
e.printStackTrace();
return 0;
}
}
@Override
public int getInt(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return o.getInt(key);
} catch (JSONException e) {
e.printStackTrace();
return 0;
}
}
@Override
public long getLong(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return o.getLong(key);
} catch (JSONException e) {
e.printStackTrace();
return 0;
}
}
@Override
public short getShort(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return (o.isNull(key)) ? 0 :
Short.valueOf(o.getString(key));
} catch (JSONException e) {
e.printStackTrace();
return 0;
}
}
private static final String empty = new String();
@Override
public String getString(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return (o.isNull(key)) ? empty : o.getString(key);
} catch (JSONException e) {
e.printStackTrace();
return empty;
}
}
@Override
public boolean isNull(int column) {
try {
String key = mProjectionMap.get(mProjection[column]);
JSONObject o = (mArray != null) ? getArrayItem() :
mObject;
return o.isNull(key);
} catch (JSONException e) {
e.printStackTrace();
return true;
}
}
}
---
On Jan 18, 3:11 am, Bert <[email protected]> wrote:
> You are always welcome to post.
>
> Thanks in advance
>
> On Jan 15, 7:34 pm, Brion Emde <[email protected]> wrote:
>
>
>
> > A JSONObject basically is a bean. It's a pretty sophisticated Map. I
> > do similar stuff to you, but I don't fool with Beans.
>
> > I encapsulated my web service as a content provider. It communicates
> > to me with JSONObjects, and JSONObjects packaging JSONArrays. I get
> > theJSONstring and parse it in the ContentProvider, then return a
> > custom Cursor-derived object that holds onto the JSONObject, and its
> > subcomponents, and does all the Cursor operations. So I never need to
> > copy any data, like what you're doing with your beans in the example
> > above.
>
> > I looked at the code and am not sure it would be that helpful to you.
> > If you want, I'll post it.
>
> > On Jan 15, 3:19 am, Bert <[email protected]> wrote:
>
> > > I'm using HttpClient to get the response of a webservice (REST
> > > servlet) which is aJSONstring.
> > > This string represents a JSONArray of type Map with key "mybeans".
> > > I'd like to assemble my bean using theJSONstring.
> > > Usually I use net.sf.jsonjson-lib and do something like this:
>
> > > String s = jsonStringIGotFromResponse;
> > > Map<String, List> bean = (Map<String, List>) JSONObject.toBean(
> > > JSONObject.fromObject(s), Map.class);
> > > List myBeans = bean.get("mybeans");
> > > JSONArray jsonArray = JSONArray.fromObject(myBeans);
> > > List<MyBean> myBeansToReturn = new ArrayList<MyBean>();
> > > for (int i = 0; i < jsonArray.size(); i++) {
> > > JSONObject jsonObject = jsonArray.getJSONObject(i);
> > > MyBean myBean = (MyBean)JSONObject.toBean(jsonObject,
> > > MyBean.class);
> > > myBeansToReturn.add(myBean);
>
> > > }
>
> > > I have no idea how to write something similar using the org.json
> > > classes provided by the Android.jar
>
> > > Could anyone help me out with this please?
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
