Develop Reference

How to Integrate Yahoo in Android

I'm very new to android development & I'm developing a yahoo login integration in Android App and return into main Activity. I have completed all the steps of yahoo integration.I have spent several days for searching yahoo integration in android but i cant find proper way.When i run this Application the Toast will appear consist of message:-
(E/Communication with the service provider failed: null(4194): oauth.signpost.exception.OAuthCommunicationException: Communication with the service provider failed: null)
then dialog box will appear with OAuth pin....Kindly any one help me about from where I get the OAuth pin and how can I retrieve yahoo mails by this Integration.
package com.example.yhoointegration;
public class MainActivity extends ActionBarActivity {
private static final String REQUEST_TOKEN_ENDPOINT_URL = "https://api.login.yahoo.com/oauth/v2/get_request_token";
private static final String ACCESS_TOKEN_ENDPOINT_URL = "https://api.login.yahoo.com/oauth/v2/get_access_token";
private static final String AUTHORIZE_WEBSITE_URL = "https://api.login.yahoo.com/oauth/v2/request_auth";
private static final int PIN_DIALOG = 0;
String CALLBACK_URL = ""; // this should be the same as
// the
// SCHEME and HOST values in
// your AndroidManifes""t.xml file
String CONSUMER_KEY = "";
String CONSUMER_SECRET = "";
private CommonsHttpOAuthConsumer myConsumer;
private CommonsHttpOAuthProvider myProvider;
private String requestToken;
private String accessToken;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
callOAuth();
showDialog(PIN_DIALOG);
}
private void callOAuth() {
try {
// retrieve the consumer token and then sign it
myConsumer = new CommonsHttpOAuthConsumer(CONSUMER_KEY,
CONSUMER_SECRET);
myConsumer.setMessageSigner(new HmacSha1MessageSigner());
HttpClient client = new DefaultHttpClient();
// retrieve the provider by using the signed consumer token
myProvider = new CommonsHttpOAuthProvider(
REQUEST_TOKEN_ENDPOINT_URL, ACCESS_TOKEN_ENDPOINT_URL,
AUTHORIZE_WEBSITE_URL, client);
myProvider.setOAuth10a(true);
String aUrl = myProvider.retrieveRequestToken(myConsumer,
CALLBACK_URL);
requestToken = myConsumer.getToken();
Log.e("Token///", "" + requestToken);
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(aUrl)));
} catch (Exception ex) {
Toast.makeText(getApplicationContext(), ex.getMessage(),
Toast.LENGTH_LONG).show();
Log.e(ex.getMessage(), ex.toString());
}
}
// this is the callback function that will run when oauth authenticates
// successfully
#Override
protected void onNewIntent(Intent intent) {
System.out.println("OnNewIntent...");
Toast.makeText(getApplicationContext(), "OnNewIntent - It works!",
Toast.LENGTH_LONG).show();
// whatever you want to do after authenticating goes here ....
}
AlertDialog createPinDialog() {
LayoutInflater factory = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
// LayoutInflater factory = LayoutInflater.from(this);
final View textEntryView = factory.inflate(R.layout.pin, null);
final EditText pinText = (EditText) textEntryView
.findViewById(R.id.pin_text);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Twitter OAuth PIN");
builder.setView(textEntryView);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
if (pinText != null)
gotOAuthPin(pinText.getText().toString());
onResume();
}
});
return builder.create();
}
private void gotOAuthPin(String pin) {
SharedPreferences.Editor editor = getSharedPreferences("yahoo",
MODE_PRIVATE).edit();
try {
myProvider.retrieveAccessToken(myConsumer, pin);
accessToken = myConsumer.getToken();
} catch (OAuthMessageSignerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (OAuthNotAuthorizedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (OAuthExpectationFailedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (OAuthCommunicationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (accessToken != null && accessToken.length() > 0) {
Toast.makeText(this, "Authorized", Toast.LENGTH_SHORT).show();
HttpPost request = new HttpPost(
"http://social.yahooapis.com/v1/user/profile?format=json");
StringEntity body = null;
/*
* try { body = new StringEntity("city=hamburg&label=" +
* URLEncoder.encode("Send via Signpost!", "UTF-8")); } catch
* (UnsupportedEncodingException e1) { // TODO Auto-generated catch
* block e1.printStackTrace(); }
* body.setContentType("application/x-www-form-urlencoded");
* request.setEntity(body);
*/
try {
myConsumer.sign(request);
} catch (OAuthMessageSignerException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (OAuthExpectationFailedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (OAuthCommunicationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println("Sending update request to Fire Eagle...");
HttpClient httpClient = new DefaultHttpClient();
HttpResponse response = null;
try {
response = httpClient.execute(request);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(
this,
"Response: " + response.getStatusLine().getStatusCode()
+ " " + response.getStatusLine().getReasonPhrase(),
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Not Authorized", Toast.LENGTH_SHORT).show();
}
}
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case PIN_DIALOG:
LayoutInflater factory = LayoutInflater.from(this);
final View textEntryView = factory.inflate(R.layout.pin, null);
final EditText pinText = (EditText) textEntryView
.findViewById(R.id.pin_text);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("OAuth PIN");
builder.setView(textEntryView);
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
if (pinText != null)
gotOAuthPin(pinText.getText().toString());
}
});
return builder.create();
}
return super.onCreateDialog(id);
}
#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);
}
}

Android App Async Failing to load internal data

I'm currently learning about IO and Async but am having issues. I'm following a guide, and according to the guide this is supposed to work. I have created an activity with a simple EditText, TextView, and 2 Buttons(save and load). I am trying to have the save button take the text in the EditText and save to internal storage, and the load button take whatever is saved and set the TextView as that. Everything works flawlessly when I put all the code to run in the UI thread, but if I change the code to have the UI thread call the Async class for the loading, nothing seems to happen.
**Packages and imports have been removed to save space.
public class InternalData extends Activity implements OnClickListener {
EditText etSharedData;
TextView tvDataResults;
FileOutputStream fos;
String FILENAME = "InternalString";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sharedpreferences);
setupVariables();
}
private void setupVariables() {
Button bSave = (Button) findViewById(R.id.bSave);
Button bLoad = (Button) findViewById(R.id.bLoad);
etSharedData = (EditText) findViewById(R.id.etSharedPrefs);
tvDataResults = (TextView) findViewById(R.id.tvLoadSharedPrefs);
bSave.setOnClickListener(this);
bLoad.setOnClickListener(this);
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.bSave:
String sData = etSharedData.getText().toString();
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(sData.getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.bLoad:
String sCollected = null;
FileInputStream fis = null;
try {
fis = openFileInput(FILENAME);
byte[] dataArray = new byte[fis.available()];
while(fis.read(dataArray) != -1){
sCollected = new String(dataArray);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
try {
fis.close();
tvDataResults.setText(sCollected);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
break;
}
}
The previous code makes everything work, but the UI lags a bit when trying to load large strings. When I try to have an LoadSomeStuff(Async) class do the loading, it does absolutely nothing when I hit Load on my phone. Within the LoadSomeStuff class it has the doInBackground method open the file and read the data into a string then return that string, and the onPostExecute method set the TextView's text to the returned String. Here's the code:
The onClick method for load button has:
new LoadSomeStuff().execute(FILENAME);
LoadSomeStuff Class *Note: This class is declared within the InternalData class.
public class LoadSomeStuff extends AsyncTask<String, Integer, String>{
#Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
String sCollected = null;
FileInputStream fis = null;
try {
fis = openFileInput(FILENAME);
byte[] dataArray = new byte[fis.available()];
while(fis.read(dataArray) != -1){
sCollected = new String(dataArray);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
try {
fis.close();
return sCollected;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(String result){
tvDataResults.setText(result);
}
}
}
Any help is greatly appreciated, thanks!

It actually looks like I had an extra method or two(like onPreExecute) with no code in them and when I deleted them it starting working.

Unable to serialize an object and getting it back in Android

I'm trying to serlize an Enum Class so I can restore in in onCreate() method so each run I have an updated class.
Here is the code for serlizing and deserializing the class:
private void serializeModulesManager() {
try {
FileOutputStream fos = openFileOutput("modules.ser",
Context.MODE_PRIVATE);
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(Module.values());
out.close();
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void restoreModulesManager() {
FileInputStream fileIn;
Module[] arr = null;
try {
fileIn = openFileInput("modules.ser");
ObjectInputStream in = new ObjectInputStream(fileIn);
arr = (Module[]) in.readObject();
for (Module c : arr) {
Module.valueOf(c.name()).serilize(c);
}
in.close();
fileIn.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (StreamCorruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
I call serializeModulesManager() in onDestroy() , and I call restoreModulesManager() in onCreate()..
The problem is that when I force close (from task manager), ObjectInputStream fails to read the object and I get an "EOFException"..
How can I fix this?

Here is how i would handle this. This is a simple object with only a title field but you can use this same idea for more complicated objects
public class MyObject implements Parcelable{
public String title;
public MyObject(){}
public MyObject(Parcel source){
title = source.readString();
}
public void setTitle(String title){
this.title = title;
}
public String getTitle(){
return this.title;
}
// Parcel Overrides
#Override
public int describeContents(){return 0;}
#Override
public void writeToParcel(Parcel dest, int flags){
dest.writeString(title);
}
// Parcelable Creator
public static final Parcelable.Creator<MyObject> CREATOR = new Parcelable.Creator<MyObject>(){
#Override
public MyObject createFromParcel(Parcel source){
return new MyObject(source);
}
#Override
public MyObject [] newArray(int size){
return new MyObject[size];
}
}
}
And then in your class that instantiates the object
// Add this in onSavedInstanceState(Bundle outState)
outState.putParcelableArray("MyObjectArray",myObjects);
then in OnCreate or whichever method your using to restore UI
// Add this
myObjects = (MyObject [])savedInstanceState.getParcelableArray("MyObjectArray");

display all textfiles in listview created by your app

The code creates a text file in local memory, but how do I get all files created by my application in a list view:
public class newfile extends Activity {
public EditText textBox,textbox2;
FileOutputStream fos=null;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.newfile);
Button save = (Button) findViewById(R.id.btnSave);
save.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
textBox = (EditText) findViewById(R.id.txtText1);
textbox2 = (EditText) findViewById(R.id.fname);
String FILENAME = textbox2.getText().toString();
String value = textBox.getText().toString();
try{
fos = openFileOutput(FILENAME,MODE_WORLD_WRITEABLE);
}
catch(IOException e)
{
e.printStackTrace();
}
byte[] buffer = value.getBytes();
try {
fos.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
fos.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
fos.close();
Toast.makeText(getBaseContext(), "File saved successfully!", Toast.LENGTH_LONG).show();
finish();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}

You can get a list all application files using Context.fileList. Then use ArrayAdapter to populate your list view

android FileInputStream crashes

I am an amateur programmer developing for android. I am just trying get the basics down right now, but I am having an error and I don't know why.
I am creating a activity that has a save and a load button, which using the fileOutputStream and fileInputStream to achieve this task.
The problem I am having is if I hit the load button the first time I use the activity, my application crashes. Can anyone help me with how to skip the load section if the file hasn't been created yet? What should I use within my if statement.
Thanks a ton, here is my code:
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class InternalData extends Activity implements OnClickListener {
String FILENAME = "InternalString";
EditText sharedData;
TextView dataResults;
FileOutputStream fos;
String d;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sharedpreferences);
Button save = (Button) findViewById(R.id.bSave);
Button load = (Button) findViewById(R.id.bLoad);
sharedData = (EditText) findViewById(R.id.etSharedPrefs);
dataResults = (TextView) findViewById(R.id.tvLoadSharedPrefs);
save.setOnClickListener(this);
load.setOnClickListener(this);
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.bSave:
d = sharedData.getText().toString();
try {
fos.write(d.getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.bLoad:
FileInputStream fis = null;
try {
if (openFileInput(FILENAME) != null){
fis = openFileInput(FILENAME);
byte[] data = new byte[fis.available()];
while(fis.read(data) != -1){
String readData = new String(data);
dataResults.setText(readData);
}}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
break;
}
}
}
Thanks for the help Lukas, I have updated my code, and I was wondering if you could look it over to make sure I am using the AsyncTask properly. Thanks again!
public class InternalData extends Activity implements OnClickListener {
String FILENAME = "InternalString";
EditText sharedData;
TextView dataResults;
FileOutputStream fos;
String d;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.sharedpreferences);
Button save = (Button) findViewById(R.id.bSave);
Button load = (Button) findViewById(R.id.bLoad);
sharedData = (EditText) findViewById(R.id.etSharedPrefs);
dataResults = (TextView) findViewById(R.id.tvLoadSharedPrefs);
save.setOnClickListener(this);
load.setOnClickListener(this);
}
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.bSave:
d = sharedData.getText().toString();
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(d.getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.bLoad:
AsyncTask<String, Integer, String> dat = new loadInternalData().execute(FILENAME);
break;
}
}
public class loadInternalData extends AsyncTask<String, Integer, String> {
#Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
FileInputStream fis = null;
String collected = null;
try {
fis = openFileInput(FILENAME);
byte[] data = new byte[fis.available()];
while (fis.read(data) != -1){
collected = new String(data);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
fis.close();
return collected;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return collected;
}
#Override
protected void onPostExecute( String result )
{
super.onPostExecute(result);
Log.i( "InteralStorage", "onPostExecute(): " + result );
dataResults.setText( result );
}
}
}

You are calling openFileInput twice. Just call it once.
Instead of this
if (openFileInput(FILENAME) != null){
fis = openFileInput(FILENAME);
}
Do this:
fis = openFileInput(FILENAME);
if (fis != null) {
// Read file
}

If you execute something on the UI-Thread, it shouldn't take longer then 5 seconds or an ANR will be triggered.
If you want to do something that might take longer then those 5 seconds, you'll want to do it in a Service or an AsyncTask.
Also, if your App gets force closed and you don't know why, you should always have a look at the LogCat output which can be shown in Eclipse. Also, you should include it with every question you ask here (about Android).