Develop Reference

android - changing Activity UI from application class

I extended the Application class in order to create singleton-like object in android.
in this object I have all the HTTP work with my server, and all the other activities can access it and call methods to GET, POST etc.
Code:
public class HttpManagerInstance extends Application {
private HttpClient httpClient;
private HttpGet get;
#Override
public void onCreate() {
httpClient = new DefaultHttpClient();
get = new HttpGet("http://10.100.102.9:8000/users/");
super.onCreate();
}
public Void getUsers() throws Exception {
new executeRequest().execute(get);
return null;
}
private class executeRequest extends AsyncTask<HttpRequest, Void, Integer> {
#Override
protected Integer doInBackground(HttpRequest... params) {
// TODO Auto-generated method stub
HttpRequest request = params[0];
HttpResponse response;
String result="";
try {
response = httpClient.execute((HttpUriRequest) request);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return responseCode;
}
#Override
protected void onPostExecute(Integer result) {
// TODO Auto-generated method stub
switch (result) {
case HttpStatus.SC_OK:
// request was fine
// Here I want to updated the GUI of the activity that called this method.
break;
}
}
}
}
This is how I call the method from the Activity:
HttpManagerInstance sampleApp = (HttpManagerInstance)getApplicationContext();
sampleApp.getUsers();
Again - I want to access the UI of the Activity that called the method to put an REQUEST ACCEPTED message.
Maybe pass a context? any ideas?

I'd create a listener:
public class HttpManagerInstance extends Application {
private HttpClient httpClient;
private HttpGet get;
public interface ResponseListener{
public void onSuccess(Object data);
}
#Override
public void onCreate() {
httpClient = new DefaultHttpClient();
get = new HttpGet("http://10.100.102.9:8000/users/");
super.onCreate();
}
public Void getUsers(ResponseListener listener) throws Exception {
new executeRequest(listener).execute(get);
return null;
}
private class executeRequest extends AsyncTask<HttpRequest, Void, Integer> {
private ResponseListener mListener;
public executeRequest(ResponseListener listener){
this.mListener = listener;
}
#Override
protected Integer doInBackground(HttpRequest... params) {
// TODO Auto-generated method stub
HttpRequest request = params[0];
HttpResponse response;
String result="";
try {
response = httpClient.execute((HttpUriRequest) request);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return responseCode;
}
#Override
protected void onPostExecute(Integer result) {
// TODO Auto-generated method stub
switch (result) {
case HttpStatus.SC_OK:
// request was fine
// Here I want to updated the GUI of the activity that called this method.
if(this.mListener != null) mListener.onSuccess(whatEverDataYouWant);
break;
}
}
}
}
Then, in your activity:
HttpManagerInstance sampleApp = (HttpManagerInstance)getApplicationContext();
sampleApp.getUsers(new ResponseListener(){
public void onSuccess(Object data){
//update your ui!
}
});

The short answer is you can't directly reference to the UI from another activity. My advice would be for you to set up a callback on your Application class and call in on executeRequest#onPostExecute then implement that callback on your Activity and update your UI from there.
If you need help to implement the callback check this question

If you need to show message is good option the Dialog Class or the Toast Class, you can see more info are here:
Dialogs: http://developer.android.com/guide/topics/ui/dialogs.html
Toasts: http://developer.android.com/guide/topics/ui/notifiers/toasts.html
But if you want to access or modify a control in your actual activity, then use Runnable class, and context.runOnUiThread() method if you work inside AsyncTask. The real problem is that you can't change UI in a AsyncTask using declaration of the controls. You need to throw a Runnable process to communicate with activity!!. For example:
context.runOnUiThread(new Runnable() {
public void run() {
//Declaration of variables
TextView MyTextView = (TextView) context.findViewById(R.id.txtvMyControl);
MyTextView.setText("My title");
}
}
If I can helps you say me, good luck!

Get information of object in mainactivity from class

I would like to use the information of 'result' in the XMLRPCMethod. When the thread is finished the correct data is in the result object.
This is a code snipped from my OpenerpRPC.java class.
class XMLRPCMethod extends Thread {
private String method;
private Object[] params;
private Handler handler;
public Object result;
private OpenerpRpc callBack;
public XMLRPCMethod(String method, OpenerpRpc callBack) {
this.method = method;
this.callBack = callBack;
handler = new Handler();
}
public void call() {
call(null);
}
public void call(Object[] params) {;
this.params = params;
start();
}
#Override
public void run() {
try {
result = client.callEx(method, params);
handler.post(new Runnable() {
public void run() {
try {
callBack.resultcall(result);
} catch (XMLRPCException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
} catch (final XMLRPCFault e) {
handler.post(new Runnable() {
public void run() {
Log.d("Test", "error", e);
}
});
} catch (final XMLRPCException e) {
handler.post(new Runnable() {
public void run() {
Throwable couse = e.getCause();
if (couse instanceof HttpHostConnectException) {
Log.d(TAG, "error"+uri.getHost());
} else {
Log.d("Test", "error", e);
}
Log.d("Test", "error", e);
}
});
}
}
}
My result call in the OpenerpRpc class looks like:
public void resultcall(Object result) throws XMLRPCException{
allres=result;
if (rtype.equals("login")){
//Isn't impossible cast the result var with (String) because cause crash..why?
userid=""+result;
}
if (rtype.equals("read")){
//Isn't impossible cast the result var with (String) because cause crash..why?
// userid=""+result;
}
// name of callback function to use in parent class (MainActivity) for receive data
this.parent.oerpcRec(rtype,allres);
}
This is how i can receive the data in mainactivity
#SuppressWarnings("unchecked")
public void oerpcRec(String rtype,Object res) throws XMLRPCException{
if (rtype=="login"){
connector.setModel("res.users");
Object[] Ids = {Integer.parseInt(connector.userid)};
// set here the fields you wont loads
Object[] values={"name"};
connector.Read(Ids,values);
}
if(rtype=="read"){
Object[] ret=(Object[])res;
Map<String, Object> map1 = (Map<String, Object>) ret[0];
if(ret.length > 1){
}
}
}
But how can i get this information in my mainactivity? I only get the information of the login id value. When I put a breakpoint in the thread it only goes to the function resultcall when I try to login.
...
public void onClick(View v) {
try {
//here set user and pass for login
connector.Login(USER,PASS);
Object[] ids = {31,30,28,26};
Object[] params ={"partner_id","tax_line","section_id","invoice_line"};
connector.Read(ids,params);
//get information of openERP for specific id's
} catch (XMLRPCException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Use an interface
public interface MyListener {
public void callback(Object result);
}
Your MainActivity must implement the interface
public class MyActivity extends Activity implements MyListener {
...
...
...
#override
public void callback(Object result) {
// getting the result value.
}
}
So when your thread finish, execute the callback() method:
MyListener ml;
ml.callback(result);
and the callback() method of you MainActivity will receive the object.

cancelRequests(context, true) in Asynchronous Http Client is not working

I need to start and stop the Http request based on AsychronousHttpClient library. i can able to get start the request and getting data from the server but i cannot able to stop the request? Can Anyone suggest any ideas. This is my sample code.
MainActivity:
public class MainActivity extends ActionBarActivity {
Context context;
public NSUCDownload downloadDishes;
public ByteArrayEntity entity;
public String jsonData;
Button send,cancel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context=this;
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
send=(Button)findViewById(R.id.send);
cancel=(Button)findViewById(R.id.cancel);
send.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Thread t1 = new Thread(new Runnable() {
public void run()
{
PostMethod();
}
}); t1.start();
}
});
cancel.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// cancel code
Client.cancelAllRequests(context);
}
});
}
void PostMethod()
{
JSONObject objRootNode = new JSONObject();
JSONArray aryChildNodes = new JSONArray();
aryChildNodes.put("some data" );// here parameter for POST data
try {
objRootNode.put("lstDishKeys_in", aryChildNodes);
} catch (JSONException e) {
e.printStackTrace();
}
System.out.println("Json Request for = "+objRootNode.toString());
String postString = objRootNode.toString();
downloadDishes = new NSUCDownload("http:// link which contains value for the Post data",postString,this);
entity = downloadDishes.start();
try {
if(entity!=null)
{
jsonData = EntityUtils.toString(entity);
System.out.println(" Json Data="+jsonData);// here i get final data
}
else
jsonData=null;
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
This is Download Class which is interact with Client class
public class NSUCDownload {
Context context;
public String url;
public GetJsonData objGetJsonData;
int methodtype = 1;
String postData = null;
public final static int GET = 1;
public final static int POST = 2;
ByteArrayEntity responseEntity=null;
Client clientRequest=new Client();
public NSUCDownload(String url, String in_postData, MainActivity context) {
this.url = url;
this.postData = in_postData;
this.methodtype = 2;
this.context=context;
}
public ByteArrayEntity start()
{
objGetJsonData = new GetJsonData();
try {
objGetJsonData.execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
return objGetJsonData.getData();
}
public class GetJsonData extends AsyncTask<Void,Void,HttpEntity>
{
public ByteArrayEntity getData()
{
return responseEntity;
}
#Override
protected void onPostExecute(HttpEntity result) {
System.out.println("On_Post_Execute_Invoked");
super.onPostExecute(result);
}
#Override
protected HttpEntity doInBackground(Void...none) {
try {
if (methodtype == POST) {
if (postData != null) {
StringEntity entity = new StringEntity(postData);
Client.post(context,url,entity, "application/json", new AsyncHttpResponseHandler() {
#Override
public void onSuccess(int statusCode,org.apache.http.Header[] headers,byte[] responseBody) {
responseEntity = new ByteArrayEntity(responseBody);
System.out.println(" Success ="+responseBody);
}
#Override
public void onFailure(int statusCode,org.apache.http.Header[] headers,byte[] responseBody, Throwable error) {
System.out.println( "Failure");
}
});
}
}
} catch (IOException e) {
e.printStackTrace();
}
return responseEntity;
}
}
}
Finally this is my Client Class:
public class Client {
static AsyncHttpClient asyncClient = new AsyncHttpClient();
static AsyncHttpClient syncClient = new SyncHttpClient();
static AsyncHttpClient clientReq;
public static void post(Context context, String url, StringEntity entity,String string, AsyncHttpResponseHandler asyncHttpResponseHandler) {
clientReq=getClient();
clientReq.post(context, url, entity, "application/json", asyncHttpResponseHandler );
System.out.println("Context=="+context);
}
private static AsyncHttpClient getClient()
{
// Return the synchronous HTTP client when the thread is not prepared
if (Looper.myLooper() == null)
{
System.out.println(" Getting SyncHttpClient Object");
return syncClient;
}
System.out.println(" Getting AsyncHttpClient Object");
return asyncClient;
}
/*I used this method but still it does not cancel the request. */
public static void cancelAllRequests(Context context)
{
clientReq.cancelRequests(context, true);
//clientReq.cancelAllRequests(true);
System.out.println("CancledRequest ");
}
}

android auto-language detection

I tried this library, suggested in one of the posts on stack overflow,
I've added the lib's jar to my build-path, but I'm not able to initialize DetectorFactory class with the languages' profiles.
this is the class handling the detection, as suggested in one of their samples:
class LanguageDetector {
public void init(String profileDirectory) throws LangDetectException {
DetectorFactory.loadProfile(profileDirectory);
}
public String detect(String text) throws LangDetectException {
Detector detector = DetectorFactory.create();
detector.append(text);
return detector.detect();
}
public ArrayList<Language> detectLangs(String text) throws LangDetectException {
Detector detector = DetectorFactory.create();
detector.append(text);
return detector.getProbabilities();
}
}
all languages profiles are stored under myProject/profiles.
trying to instantiate the class crashes my app without any useful message to logcat
calling the class ():
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
context = this.getActivity().getApplicationContext();
/* LanguageDetector detector = null;
try {
detector.init("/waggle/profiles");
} catch (LangDetectException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
new GetDataTask().execute(context);
}

Change the methods in LanguageDetector to static:
class LanguageDetector {
public static void init(String profileDirectory) throws LangDetectException {
DetectorFactory.loadProfile(profileDirectory);
}
public static String detect(String text) throws LangDetectException {
Detector detector = DetectorFactory.create();
detector.append(text);
return detector.detect();
}
public static ArrayList<Language> detectLangs(String text) throws LangDetectException {
Detector detector = DetectorFactory.create();
detector.append(text);
return detector.getProbabilities();
}
}
And use as follows:
try {
LanguageDetector.init("/waggle/profiles"); // <-- Are you sure the profiles are at this location???
} catch (LangDetectException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String detectedLanguage = null;
try {
detectedLanguage = LanguageDetector.detect("Dies ist ein Beispiel in Deutsch.");
} catch (LangDetectException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (detectedLanguage != null) {
// Implement your logic here
}

How to Display Progress Dialog for Android Robotium Test:

Main Class:
public class ProgressIndicator {
static ProgressIndicator instance;
Context context;
public static ProgressIndicator getInstance() {
if (instance == null) {
instance = new ProgressIndicator();
}
return instance;
}
private ProgressIndicator() {
}
IndicatorThread sd;
public void showIndicator(Activity activity, String title, String message, boolean flag) {
sd = new IndicatorThread(activity, title, message, flag);
sd.start();
}
public void dismissIndicator(Activity activity) throws InterruptedException{
sd.dismiss();
// sd.join();
}
private static class IndicatorThread extends Thread {
private static final Message listener = null;
private static String mTitle;
private static String mText;
private Activity mActivity;
private boolean mflag;
private ProgressDialog mDialog;
protected boolean dismiss;
IndicatorThread(Activity activity, String title, String text, boolean flag) {
super();
IndicatorThread.mText = text;
IndicatorThread.mTitle = title;
this.mActivity = activity;
this.mflag = flag;
if (mDialog == null) {
mDialog = new ProgressDialog(mActivity);
mDialog.setTitle(mTitle);
mDialog.setMessage(mText);
mDialog.setIndeterminate(true);
mDialog.setCancelable(true);
mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
if(mflag == true){
mDialog.setButton("Cancel", listener);
mDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface arg0) {
mDialog.dismiss();
interrupt();
}
});
}
}
mDialog.show();
mDialog.getWindow().setLayout(160, 350);
mDialog.getWindow().setGravity(0);
}
public void dismiss() {
dismiss = true;
mDialog.dismiss();
System.out.println("notifying..."+dismiss);
synchronized (this) {
notifyAll();
}
}
#Override
public void run() {
System.out.println("Running..."+dismiss);
while (!dismiss) {
System.out.println("waiting..."+!dismiss);
synchronized (this) {
try {
wait();
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
System.out.println("Quitting...");
}
}
}
Call from AppController class:
private ProgressIndicator progressInstance = null;
public void showWaitingAnimation(Activity parent) {
progressInstance.showIndicator(AppController.getInstance().currentActivity, "" , "", false);
}
Test Class:
public class ProgressIndicatorTest extends
ActivityInstrumentationTestCase2<MyTestActivity> {
private Solo solo;
private ProgressIndicator progressIndicatorInstance;
public ProgressIndicatorTest() {
super("com.test.activity",
MyTestActivity.class);
}
protected void setUp() throws Exception {
AppController.getInstance().startApp(getActivity());
solo = new Solo(getInstrumentation(), getActivity());
progressIndicatorInstance = ProgressIndicator.getInstance();
}
protected void tearDown() throws Exception {
try {
solo.finalize();
} catch (Throwable e) {
e.printStackTrace();
}
getActivity().finish();
super.tearDown();
}
public void testGetInstance() {
try {
ProgressIndicator instance = ProgressIndicator.getInstance();
assertNotNull(instance);
} catch (Exception e) {
fail("Creation of ExceptionDetails get instance failed!");
}
}
public void testShowIndicator() {
Log.d("testCase Name:-", "testShowIndicator");
ProgressIndicator progressInstance = ProgressIndicator.getInstance() ;
progressInstance.showIndicator(AppController.getInstance().getCurrentActivity(), "" , "", false);
//AppController.getInstance().showWaitingAnimation(AppController.getInstance().getCurrentActivity());
solo.waitForDialogToClose(8000);
try {
progressInstance.dismissIndicator(AppController.getInstance().getCurrentActivity());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void testDismissIndicator() {
Log.d("testCase Name:-", "testDismissIndicator");
ProgressIndicator progressInstance = ProgressIndicator.getInstance() ;
progressInstance.showIndicator(AppController.getInstance().getCurrentActivity(), "" , "", false);
solo.waitForDialogToClose(2000);
try {
progressInstance.dismissIndicator(AppController.getInstance().getCurrentActivity());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//AppController.getInstance().showAppTerminationDialog("", AppController.getInstance().getCurrentActivity());
}
}
While running the project the dialog is visible & working properly. But while running the test case only a black screen is visible, no dialog is getting displayed (after using solo.waitForDialogToClose(8000); problem is there). No error or exception is getting thrown and the test cases are getting passed in Android Junit test. If anyone has any idea how to display this progress dialog in case of robotium test, Please share.

In my case I can successfully display progress dialogs.
I simply used
boolean showProgressBar = false;
showProgressBar = solo.waitForText("Verifying and Saving Credentials...", 1, 3000);
I hope it should also work for you.. :)