Develop Reference

How to pass data from one activity to another activity in Android

Im a newbie to android. i want to create an application that sends the user1 location to the user2 using ServerSocket.
public class ToMain extends Activity {
TextView info, infoip, msg;
String message ="";
ServerSocket serverSocket;
String s="",t="";
public Double b,c;
public int i;
private class SocketServerThread extends Thread {
static final int SocketServerPORT = 8080;
int count = 0;
#Override
public void run() {
Socket socket = null;
DataInputStream dataInputStream = null;
DataOutputStream dataOutputStream = null;
try {
serverSocket = new ServerSocket(SocketServerPORT);
ToMain.this.runOnUiThread(new Runnable() {
#Override
public void run() {
info.setText("I'm waiting here: "
+ serverSocket.getLocalPort());
}
});
while (true) {
socket = serverSocket.accept();
dataInputStream = new DataInputStream(
socket.getInputStream());
dataOutputStream = new DataOutputStream(
socket.getOutputStream());
String messageFromClient = "";
//If no message sent from client, this code will block the program
messageFromClient = dataInputStream.readUTF();
I Split the Latitude and Longitude this way in the Server side
for(int j=0;j<i;j++){
if(messageFromClient.charAt(j)!='+' && bool==false){
s=s+messageFromClient.charAt(j);
}
else{
bool=true;
}
if(bool){
t=t+messageFromClient.charAt(j);
}
}
I Store in these two Variable
b = Double.parseDouble(s);
c = Double.parseDouble(t);
ToMain.this.runOnUiThread(new Runnable() {
#Override
public void run() {
}
});
String msgReply = "Location Sent!" + count;
dataOutputStream.writeUTF(msgReply);
i want to send those variable from here to the main activity which contain the map
// startActivity(intent);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String errMsg = e.toString();
ToMain.this.runOnUiThread(new Runnable() {
#Override
public void run() {
}
});
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null) {
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null) {
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
How do i pass a and b to the main activity.

Pass data through intents.
Intent data = new Intent(this,SecondActivity.class);
data.putExtra("keyA",a);
data.putExtra("keyB",b);
startActivity(data);
In second activity in onCreate()
Intent intent = getIntent();
Double a = intent.getDoubleExtra("keyA",0);
Double b = intent.getDoubleExtra("keyB",0);

Use Intent to pass data from one activity to another activity
Intent intent = new Intent(this,SecondActivity.class);
intent .putExtra("key1",value);
intent .putExtra("key2",value);
startActivity(intent );
In second activity in onCreate()
Intent intent = getIntent();
Double a = intent.getDoubleExtra("key1",0); // Notice 0 is the default value here
Double b = intent.getDoubleExtra("key2",0);

To pass data from one Activity to another, you can use Extras in Intent.
Intent intent = new Intent("ACTIVITY_INTENT");
intent.putExtra("selection", position);
startActivity(intent);
You can send Binary, Text and multiple pieces as listed here,
http://developer.android.com/training/sharing/send.html
To receive the data in the next activity, in the oncreate method of the activity,
extras = getIntent().getExtras();
int value = extras.getInt("selection");
In case if you want to persist the data, the simplest way to achieve this would be saving it in Shared Preferences.
Developer link has good information on how to implement this - http://developer.android.com/training/basics/data-storage/shared-preferences.html
To write the data,
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();
To read the data,
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
int defaultValue = getResources().getInteger(R.string.saved_high_score_default);
long highScore = sharedPref.getInt(getString(R.string.saved_high_score), defaultValue);
all the best

In Android user interface is displayed through an activity. Activity is used to represent the data to user and allows user interaction. In an android application, we can have multiple activities and that can interact with each other. During activity interaction we might required to pass data from one activity to other.
Now, to pass data from one activity to other in android, you need to do the following :
You can send data from one actvity to another with an Intent.
An intent contains the action and optionally additional data. The data can be passed to other activity using intent putExtra() method. Data is passed as extras and are key/value pairs. The key is always a String. As value you can use the primitive data types int, float, chars, etc. We can also pass Parceable and Serializable objects from one activity to other.
Intent intent = new Intent(context, YourActivityClass.class);
intent.putExtra(KEY, <your value here>);
startActivity(intent);

How to stop a thread onClick with a boolean?

I am trying to find a way to skip a flash screen by clicking on the screen of the activity. This is what I came to and it works. The problem is that after I click and the new activity is called, the boolean false default if runs again and the intent is called twice. What am I doing wrong?
RelativeLayout OnClickSkipScreen = (RelativeLayout)findViewById(R.id.SplashScreenView);
OnClickSkipScreen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
OnClickSkip = true;
/*Loading.interrupt();
Intent SplashScreen = new Intent(SplashScreen.this, HomeScreen.class);
startActivity(SplashScreen);
overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
finish();*/
}
});
Thread Loading = new Thread() {
#Override
public void run() {
if (!OnClickSkip) {
try {
sleep(2573);
Intent SplashScreen = new Intent(SplashScreen.this, HomeScreen.class);
startActivity(SplashScreen);
overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
} catch (Exception e) {
e.printStackTrace();
} finally {
finish();
}
} else if (OnClickSkip) {
try {
Intent SplashScreen = new Intent(SplashScreen.this, HomeScreen.class);
startActivity(SplashScreen);
overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
} catch (Exception e) {
e.printStackTrace();
} finally {
finish();
}
}
}
};
Loading.start();
}

use SharedPreference. Then think is whenever your class loads up it loads your boolean to its initial status which is false. so you will only meet one condition,all the time, which is the condition you are meeting now.
When i say persist, i mean you need to save your boolean state so as you can load it up from storage and check,with this your boolean will not be dependent on the initial state which is always false
so in your oncreate it could be this
SharedPreference sp = getPreference(0);
boolean OnClickSkip = sp.getBoolean("onclick",false);
now you can continue; if you want to save your boolean state
Editor e = sp.edit();
e.putBoolean("onclick",onClickSkip);
e.commit();
now continue to your codes

Handing over Facebook data via Intent

I am trying to pass Facebook data from one activity to another.
The logs in activity 1 show that all the data was received (name, age etc.).
However, when I try to work with this data in activity 2, nothing happens. None of the logs at the bottom show up. Any idea what I'm doing wrong?
protected void handleFacebookData()
{
Intent intent = getIntent();
name = (String) intent.getSerializableExtra(Const.NAME);
Log.d(Profile.class.getSimpleName(), "Got FB name");
age = (String) intent.getSerializableExtra(Const.AGE);
Log.d(Profile.class.getSimpleName(), "Got FB age");
imgUrl = (String) intent.getSerializableExtra(Const.PIC);
x = BitmapFactory.decodeFile(imgUrl);
Log.d(Profile.class.getSimpleName(), "Got FB picture");
facebookData = true;
}

final Intent intent = new Intent(
MainActivity.this,
Profile.class);
intent.putExtra(Const.NAME,
getFacebookAccountName(userString));
intent.putExtra(Const.AGE,
getFacebookAge(userString));
intent.putExtra(Const.PIC,
getFacebookImage(userString));
startActivityForResult(intent,
REQUEST_FOR_RESULT_CREATE);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onError(DialogError de) {
Log.v(TAG, "********************** fb: onError()");
}
#Override
public void onFacebookError(FacebookError error) {
Log.v(TAG,
"********************** fb: onFacebookError()");
}
});
}

save check box state in android after back button clicked

i am using check box for saving data in database .if it is checked then app redirecting to other screen by saving data after that if i click on device back button then app showing it is not checked.how can i fix this issue?
here i am placing code
public void joinLisn(){
String shareProfileType2=Constants.PROFILE_SHARE_ALL;
String accessToken = null;
DatabaseHelper helper = new DatabaseHelper(getApplicationContext());
DatabaseUtility dao = new DatabaseUtility(helper);
try {
accessToken = dao.getAccessToken();
} catch (Exception e1) {
handler.sendEmptyMessage(1);
return;
}
if(accessToken == null || accessToken.length() == 0){
handler.sendEmptyMessage(1);
return;
}
Map<String , String> params = new HashMap<String,String>();
params.put(Constants.ACCESS_TOKEN_PARAM, accessToken);
params.put(Constants.LISN_ID_PARAM, id);
params.put(Constants.PROFILE_TYPE_PARAM,shareProfileType2);
Status status = null;
try {
status = Utils.joinLisn(params, this);
} catch (NullPointerException e) {
handler.sendEmptyMessage(12);
return;
} catch (JSONException e) {
handler.sendEmptyMessage(11);
return;
}
if(status == null){
handler.sendEmptyMessage(1);
} else if(status.getStatus().equalsIgnoreCase(Constants.SUCCESS)){
try {
Intent lisnDetailIntent = new Intent(this, LisnDetailTabView.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Bundle bundleObj = new Bundle();
bundleObj.putString("id", id);
bundleObj.putString("RSVP","In");
lisnDetailIntent.putExtras(bundleObj);
startActivityForResult(lisnDetailIntent,0);
overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.slide_out_right);
handler.sendEmptyMessage(8);
} catch(Exception ex) {}
} else{
handler.sendEmptyMessage(2);
return;
}
}

Override the onbackpressed to trigger your function to save the states.
public void onBackPressed() {
//Do your db saving here
super.onBackPressed();
}

If your app is redirecting to other app, your app will be put to background. Make use of onSaveInstanceState and onRestoreInstanceState to save and restore the checkbox state.

Android IAB - Activity destroyed after successful purchase

I am pulling my hair out! At one point in the last week, I had this working.
I have an Android app that I am trying to add in-ap billing to. I followed the sample TrivialDrive, and my code worked a few times. Now it doesn't.
I am creating a simple trivia game that has a number of free questions, and the option to upgrade to get more questions. When the user completes the list of free questions, they are taken to a "Game Over" screen where they can erase their answers and start again, or upgrade.
When I click the "Upgrade" button, I can make a successful purchase, but as soon as the Google "Payment Successful" dialog goes away, my activity is destroyed and I am sent back to my main activity.
When I try to go back and do my purchase again, my code catches the error ("You already own this item") and handles it appropriately. My code explains to the user that they already own the upgrade, and allows them to click a button to continue playing. So it looks like the OnIabPurchaseFinishedListener is firing at this point.
I have updated the Google helper code with the latest files.
Any help or suggestions as to where to look for answers is much appreciated.
Thanks.
This is the relevant code for my activity:
public class GameOverActivity extends BaseActivity
{
private IabHelper mHelper;
private String m_base64EncodedPublicKey;
private static String THE_UPGRADE_SKU = "upgrade52";
public static int BILLING_RESPONSE_RESULT_ITEM_ALREADY_OWNED = 7;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_over);
setTitle("Game Over");
Button butPlay = (Button) findViewById(R.id.buttonPlay);
butPlay.setVisibility(View.INVISIBLE);
PrepareIAB();
}
#Override
protected void onResume()
{
super.onResume();
CURRENT_ACTIVITY = ACTIVITY_GAME_OVER;
SetMainText();
}
#Override
protected void onDestroy()
{
super.onDestroy();
try
{
if (mHelper != null)
{
mHelper.dispose();
mHelper = null;
}
}
catch (Exception e)
{
}
}
private void PrepareIAB()
{
m_base64EncodedPublicKey = "MyKey";
// compute your public key and store it in base64EncodedPublicKey
mHelper = new IabHelper(this, m_base64EncodedPublicKey);
mHelper.enableDebugLogging( true, TAG);
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener()
{
public void onIabSetupFinished(IabResult result)
{
if (!result.isSuccess())
{
ShowMessage("There was an error connecting to the Google Play Store.");
}
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
try
{
// Pass on the activity result to the helper for handling
if (!mHelper.handleActivityResult(requestCode, resultCode, data))
{
// not handled, so handle it ourselves (here's where you'd
// perform any handling of activity results not related to in-app
// billing...
super.onActivityResult(requestCode, resultCode, data);
}
else
{
// Log.d(TAG, "onActivityResult handled by IABUtil.");
}
}
catch (Exception e)
{
super.onActivityResult(requestCode, resultCode, data);
}
}
IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener =
new IabHelper.OnIabPurchaseFinishedListener()
{
public void onIabPurchaseFinished(IabResult result, Purchase purchase)
{
try
{
if (result.isFailure())
{
if (result.mResponse==7)
{
UpgradeComplete();
ShowMessage("Thank you for upgrading.\r\n\r\nThis version has 400 more questions.");
}
else
{
ShowMessage("Error purchasing: " + String.valueOf(result.mResponse));
UpgradeError();
return;
}
}
else if (purchase.getSku().equals(THE_UPGRADE_SKU))
{
UpgradeComplete();
ShowMessage("Thank you for upgrading.\r\n\r\nThis version has 400 more questions.");
}
else
{
ShowMessage("Something else happened. ");
}
}
catch (Exception e)
{
Log.e(TAG, e.getLocalizedMessage());
}
}
};
private void HideUpgrade()
{
try
{
Button btnUpgrade = (Button) findViewById(R.id.buttonUpgrade);
if (btnUpgrade != null)
{
btnUpgrade.setVisibility(View.INVISIBLE);
}
TextView txtMessage = (TextView) findViewById(R.id.txtUpgradeFromGameOver);
if (txtMessage!=null)
{
txtMessage.setVisibility(View.INVISIBLE);
}
}
catch (Exception e)
{
}
}
public void onQuitButtonClick(View view)
{
finish();
}
public void onResetDBButtonClick(View view)
{
ConfirmResetDatabase();
}
private void ConfirmResetDatabase()
{
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface dialog, int which)
{
switch (which)
{
case DialogInterface.BUTTON_POSITIVE:
ResetDatabase();
Intent gameActivity = new Intent(getApplicationContext(), GameActivity.class);
gameActivity.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
// startActivityForResult(gameActivity, ACTIVITY_GAME);
startActivity(gameActivity);
break;
case DialogInterface.BUTTON_NEGATIVE:
// No button clicked
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Do you want to erase your score and start over?").setPositiveButton("Yes", dialogClickListener).setNegativeButton("No", dialogClickListener).show();
}
public void onUpgradeButtonClick(View view)
{
try
{
if (mHelper != null)
{
mHelper.launchPurchaseFlow(this, THE_UPGRADE_SKU, 10001, mPurchaseFinishedListener, m_TriviaAppInstance.AppInstallID());
}
else
{
ShowMessage("Unable to connect to Google Play Store.");
}
}
catch (Exception e)
{
ShowMessage("Unable to connect to Google Play Store.");
SendErrorMessage(e.getLocalizedMessage());
}
}
private void UpgradeComplete()
{
try
{
HideUpgrade();
Button butPlay = (Button) findViewById(R.id.buttonPlay);
if (butPlay!=null)
{
butPlay.setVisibility(View.VISIBLE);
}
TextView txtReset = (TextView) findViewById(R.id.txtGameOverRestDB);
if (txtReset!=null)
{
txtReset.setVisibility(View.INVISIBLE);
}
Button btnReset = (Button)findViewById(R.id.buttonResetDB);
if (btnReset!=null)
{
btnReset.setVisibility(View.INVISIBLE);
}
m_TriviaAppInstance.SetUpgradedStatus(true);
}
catch (Exception e)
{
}
//
}
private void UpgradeError()
{
try
{
Button butUpgrade;
butUpgrade = (Button) findViewById(R.id.buttonUpgrade);
butUpgrade.setVisibility(View.INVISIBLE);
TextView txtMessage = (TextView) findViewById(R.id.txtUpgradeScreen);
txtMessage.setText(R.string.upgradeScreenTextError);
}
catch (Exception e)
{
}
}
public void onPlayButtonClick(View view)
{
Intent myIntent = new Intent(view.getContext(), GameActivity.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivityForResult(myIntent, ACTIVITY_GAME);
}
public void SetMainText()
{
TextView txt = (TextView) findViewById(R.id.txtScoreGlobal);
txt.setText(Integer.toString(m_TriviaAppInstance.getGlobal()) + "%");
SetPlayerScore(1);
if (m_TriviaAppInstance.getUpgradedStatus() == true)
{
HideUpgrade();
}
}
}

FYI: I think I have this figured out - for anyone else that may come across it.
The activity that I was using to launch "In App Billing" was called with a "FLAG_ACTIVITY_NO_HISTORY". I did this because I didn't want the user to be able to click to go back to this "Game Over" activity.
BUT, this causes grief with "In App Billing". So, make sure you don't try to launch "In App Billing" from an activity that has had the "FLAG_ACTIVITY_NO_HISTORY" set.
My original code:
private void GameOver()
{
m_TriviaAppInstance.setGameOver(true);
Intent gameOver = new Intent(getApplicationContext(), GameOverActivity.class);
gameOver.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(gameOver);
}
Updated code:
private void GameOver()
{
m_TriviaAppInstance.setGameOver(true);
Intent gameOver = new Intent(getApplicationContext(), GameOverActivity.class);
startActivity(gameOver);
}
Peace

I'm not high enough to comment, but bless you. I had
android:noHistory="true"
set in AndroidManifest.xml for my activity and was experiencing the same problem.
Took it out and IAB is working. Yay!

Do not forget that your IabHelper.OnIabPurchaseFinishedListener is called on a different thread and before onResume() is called on your Activity!
So your UpgradeComplete() or UpgradeError() can cause a crash on older devices (Crashed every time on my Gingerbread Sony Xperia Mini Pro and worked without any trouble on Samsung Galaxy S4 (Android 4.2.2)
Caused a 3 day delay on my game..