We Keep Coding

Implement Back Pressed In Android Fragments

I've been stuck in a situation and i need some help over here. There are many articles on this topic here but none of them answered my question. I want to implement onBackPressed() in fragments and show dialog box which shows to exit the application or not. Any help would be appreciated.
LoginFragment.java
public class LoginFragment extends Fragment {
public static final String TAG = LoginFragment.class.getSimpleName();
private EditText mEtEmail;
private EditText mEtPassword;
private Button mBtLogin;
private TextView mTvRegister;
private TextView mTvForgotPassword;
private TextInputLayout mTiEmail;
private TextInputLayout mTiPassword;
private ProgressBar mProgressBar;
private CompositeSubscription mSubscriptions;
private SharedPreferences mSharedPreferences;
#NonNull
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_login,container,false);
mSubscriptions = new CompositeSubscription();
initViews(view);
initSharedPreferences();
return view;
}
private void initViews(View v) {
mEtEmail = v.findViewById(R.id.et_email);
mEtPassword = v.findViewById(R.id.et_password);
mBtLogin = v.findViewById(R.id.btn_login);
mTiEmail = v.findViewById(R.id.ti_email);
mTiPassword = v.findViewById(R.id.ti_password);
mProgressBar = v.findViewById(R.id.progress);
mTvRegister = v.findViewById(R.id.tv_register);
mTvForgotPassword = v.findViewById(R.id.tv_forgot_password);
mBtLogin.setOnClickListener(view -> login());
mTvRegister.setOnClickListener(view -> goToRegister());
mTvForgotPassword.setOnClickListener(view -> showDialog());
}
private void initSharedPreferences() {
mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
}
private void login() {
setError();
String email = mEtEmail.getText().toString();
String password = mEtPassword.getText().toString();
int err = 0;
if (!validateEmail(email)) {
err++;
mTiEmail.setError("Email should be valid !");
}
if (!validateFields(password)) {
err++;
mTiPassword.setError("Password should not be empty !");
}
if (err == 0) {
loginProcess(email,password);
mProgressBar.setVisibility(View.VISIBLE);
} else {
showSnackBarMessage("Enter Valid Details !");
}
}
private void setError() {
mTiEmail.setError(null);
mTiPassword.setError(null);
}
private void loginProcess(String email, String password) {
mSubscriptions.add(NetworkUtil.getRetrofit(email, password).login()
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.subscribe(this::handleResponse,this::handleError));
}
private void handleResponse(Response response) {
mProgressBar.setVisibility(View.GONE);
SharedPreferences.Editor editor = mSharedPreferences.edit();
editor.putString(Constants.TOKEN,response.getToken());
editor.putString(Constants.EMAIL,response.getMessage());
editor.apply();
mEtEmail.setText(null);
mEtPassword.setText(null);
Intent intent = new Intent(getActivity(), HomeActivity.class);
startActivity(intent);
}
private void handleError(Throwable error) {
mProgressBar.setVisibility(View.GONE);
if (error instanceof HttpException) {
Gson gson = new GsonBuilder().create();
try {
String errorBody = ((HttpException) error).response().errorBody().string();
Response response = gson.fromJson(errorBody,Response.class);
showSnackBarMessage(response.getMessage());
} catch (IOException e) {
e.printStackTrace();
}
} else {
showSnackBarMessage("No Internet Connection!");
}
}
private void showSnackBarMessage(String message) {
if (getView() != null) {
Snackbar.make(getView(),message,Snackbar.LENGTH_SHORT).show();
}
}
private void goToRegister(){
FragmentTransaction ft = getFragmentManager().beginTransaction();
RegisterFragment fragment = new RegisterFragment();
ft.replace(R.id.fragmentFrame,fragment,RegisterFragment.TAG);
ft.addToBackStack(null).commit();
}
private void showDialog(){
ResetPasswordDialog fragment = new ResetPasswordDialog();
fragment.show(getFragmentManager(), ResetPasswordDialog.TAG);
}
#Override
public void onDestroy() {
super.onDestroy();
mSubscriptions.unsubscribe();
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity implements ResetPasswordDialog.Listener {
public static final String TAG = MainActivity.class.getSimpleName();
private LoginFragment mLoginFragment;
private ResetPasswordDialog mResetPasswordDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
loadFragment();
}
}
private void loadFragment() {
if (mLoginFragment == null) {
mLoginFragment = new LoginFragment();
}
getFragmentManager().beginTransaction().replace(R.id.fragmentFrame, mLoginFragment, LoginFragment.TAG).commit();
}
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
String data = intent.getData().getLastPathSegment();
Log.d(TAG, "onNewIntent: " + data);
mResetPasswordDialog = (ResetPasswordDialog) getFragmentManager().findFragmentByTag(ResetPasswordDialog.TAG);
if (mResetPasswordDialog != null)
mResetPasswordDialog.setToken(data);
}
#Override
public void onPasswordReset(String message) {
showSnackBarMessage(message);
}
private void showSnackBarMessage(String message) {
Snackbar.make(findViewById(R.id.activity_main), message, Snackbar.LENGTH_SHORT).show();
}
}
In My Login Fragment, I want to show a dialog box "Do you want to exit the application or not". On Yes it dismiss the current fragment and end the activity otherwise it'll remain active. Help please!

You can even try this way
MainActivity.java
#Override
public void onBackPressed() {
if (getFragmentManager() != null && getFragmentManager().getBackStackEntryCount() >= 1) {
String fragmentTag = getFragmentManager().findFragmentById(R.id.frame_container).getTag();
if(fragmentTag.equals(LoginFragment.getTag())){
// show Dialog code
}else{
super.onBackPressed();
}
} else {
super.onBackPressed();
}
}
Add this code in your main activity so that when login fragment is added and you click backpress, then on first if the fragment is added to fragment transaction, then first it finds the fragment and check if its tag is equals to the login fragment tag. Then if both tag matches, then you can show your exit alert dialog.

Android team has prepared a new way of handling the back button pressed on Fragments for us, so you should check this out. It's called OnBackPressedDispatcher.
You need to register OnBackPressedCallback to the fragment where do you want to intercept back button pressed. You can do it like this inside of the Fragment:
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
OnBackPressedCallback callback = new OnBackPressedCallback(true) {
#Override
public void handleOnBackPressed() {
//show exit dialog
}
};
requireActivity().getOnBackPressedDispatcher().addCallback(this, callback);
}

Broadcast manager not working in Fragment

I have a BroadcastReceiver which is used to receive data from a BLE device. The same code is working fine in an Activity but not in Fragment.
Here is the code:
public class HomeFragment extends Fragment implements LocationListener {
Session session;
TextView textViewName;
TextView textViewSteps;
TextView textViewCalories;
TextView textViewDistance;
TextView textViewFimos;
ImageView imageViewInfo;
public static final String TAG = "StepCounter";
private UARTService mService = null;
private BluetoothDevice evolutionDevice = null;
private static final int UART_PROFILE_CONNECTED = 20;
private static final int UART_PROFILE_DISCONNECTED = 21;
private int mState = UART_PROFILE_DISCONNECTED;
MyDatabase myDatabase;
LocationManager service;
private LocationManager locationManager;
private String provider;
double latitude, longitude;
List<Byte> listBytes = new ArrayList<>();
int rowNumber = 1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_home, container, false);
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
init(view);
return view;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
service_init();
}
private void init(View view) {
session = new Session(getActivity());
myDatabase = new MyDatabase(getActivity());
service = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
boolean enabled = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!enabled) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
}
textViewName = view.findViewById(R.id.textViewName);
textViewSteps = view.findViewById(R.id.textViewSteps);
textViewCalories = view.findViewById(R.id.textViewCalories);
textViewDistance = view.findViewById(R.id.textViewDistance);
textViewFimos = view.findViewById(R.id.textViewFimos);
imageViewInfo = view.findViewById(R.id.imageViewInfo);
try {
textViewName.setText("Hi, " + session.getUser().getUser().getName());
} catch (Exception e) {
}
}
private void service_init() {
System.out.println("---->>>>");
Intent bindIntent = new Intent(getActivity().getApplicationContext(), UARTService.class);
getActivity().bindService(bindIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
LocalBroadcastManager.getInstance(getActivity()).registerReceiver(UARTStatusChangeReceiver, makeGattUpdateIntentFilter());
}
private ServiceConnection mServiceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder rawBinder) {
mService = ((UARTService.LocalBinder) rawBinder).getService();
Log.d(TAG, "onServiceConnected mService= " + mService);
if (!mService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
getActivity().finish();
}
}
public void onServiceDisconnected(ComponentName classname) {
mService = null;
}
};
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(UARTService.ACTION_GATT_CONNECTED);
intentFilter.addAction(UARTService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(UARTService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(UARTService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(UARTService.DEVICE_DOES_NOT_SUPPORT_UART);
return intentFilter;
}
private final BroadcastReceiver UARTStatusChangeReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
final Intent mIntent = intent;
//*********************//
if (action.equals(UARTService.ACTION_GATT_CONNECTED)) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
System.out.println("------- Device Connected: " + evolutionDevice.getName() + " - " + evolutionDevice.getAddress());
mState = UART_PROFILE_CONNECTED;
}
});
}
//*********************//
if (action.equals(UARTService.ACTION_GATT_DISCONNECTED)) {
getActivity().runOnUiThread(new Runnable() {
public void run() {
System.out.println("------- Device Disconnected");
mState = UART_PROFILE_DISCONNECTED;
mService.close();
evolutionDevice = null;
}
});
}
//*********************//
if (action.equals(UARTService.ACTION_GATT_SERVICES_DISCOVERED)) {
mService.enableTXNotification();
}
//*********************//
if (action.equals(UARTService.ACTION_DATA_AVAILABLE)) {
final byte[] txValue = intent.getByteArrayExtra(UARTService.EXTRA_DATA);
List<Byte> byteList = Bytes.asList(txValue);
combineArrays(byteList);
}
//*********************//
if (action.equals(UARTService.DEVICE_DOES_NOT_SUPPORT_UART)) {
System.out.println("------- Device doesn't support UART. Disconnecting");
mService.disconnect();
}
}
};
#Override
public void onResume() {
super.onResume();
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(provider, 400, 1, this);
Log.d(TAG, "onResume");
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
#Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy()");
try {
LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(UARTStatusChangeReceiver);
} catch (Exception ignore) {
Log.e(TAG, ignore.toString());
}
getActivity().unbindService(mServiceConnection);
mService.stopSelf();
mService = null;
}
The complete code in the same ay with a few changes in working fine in Activity. Any idea what might be the blocker.? Do I need to do something else in the fragment to receive the data from the Local Broadcast Manager.?

Please try this way :
Create class BroadcastHelper
public class BroadcastHelper {
public static final String BROADCAST_EXTRA_METHOD_NAME = "INPUT_METHOD_CHANGED";
public static final String ACTION_NAME = "hossam";
public static void sendInform(Context context, String method) {
Intent intent = new Intent();
intent.setAction(ACTION_NAME);
intent.putExtra(BROADCAST_EXTRA_METHOD_NAME, method);
try {
context.sendBroadcast(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void sendInform(Context context, String method, Intent intent) {
intent.setAction(ACTION_NAME);
intent.putExtra(BROADCAST_EXTRA_METHOD_NAME, method);
try {
context.sendBroadcast(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
}
And in your fragment :
private Receiver receiver;
private boolean isReciverRegistered = false;
#Override
public void onResume() {
super.onResume();
if (receiver == null) {
receiver = new Receiver();
IntentFilter filter = new IntentFilter(BroadcastHelper.ACTION_NAME);
getActivity().registerReceiver(receiver, filter);
isReciverRegistered = true;
}
}
#Override
public void onDestroy() {
if (isReciverRegistered) {
if (receiver != null)
getActivity().unregisterReceiver(receiver);
}
super.onDestroy();
}
private class Receiver extends BroadcastReceiver {
#Override
public void onReceive(Context arg0, Intent arg1) {
Log.v("r", "receive " + arg1.getStringExtra(BroadcastHelper.BROADCAST_EXTRA_METHOD_NAME));
String methodName = arg1.getStringExtra(BroadcastHelper.BROADCAST_EXTRA_METHOD_NAME);
if (methodName != null && methodName.length() > 0) {
Log.v("receive", methodName);
switch (methodName) {
case "Test":
Toast.makeText(getActivity(), "message", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
}
}
And to send your broadcast this this code :
BroadcastHelper.sendInform(context, "Test");
Or if you want to send data with it use :
Intent intent = new Intent("intent");
intent.putExtra("desc", desc);
intent.putExtra("name", Local_name);
intent.putExtra("code", productCode);
BroadcastHelper.sendInform(getActivity(), "Test" , intent);

I have a fragment where I do something similar. I put my code to setup the service in onCreateView and have a register and unregister in onPause() and onResume. Works good for me.

Can you check modify register receiver in service_init()
as
getActivity().registerReceiver(UARTStatusChangeReceiver, makeGattUpdateIntentFilter());
and for unregisterer receiver
getActivity().unregisterReceiver(UARTStatusChangeReceiver);

How to share connection between fragment and activity

i have bluetooth Fragment.
I have my first Activity in which the BT connection is established. There is an option presented to the user and, based on their selection, a different Activity will load.
public class BluetoothFragment extends Fragment {
private NameMappingDataSource mName;
private DeviceAutoConnectDataSource deviceAutoConnect;
private ActivateDatasource activateDatasource;
List<DisplayNameMapping> dataItemsdevice = new ArrayList<DisplayNameMapping>();
private static final String TAG = "BluetoothChatFragment";
private static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2;
private static final int REQUEST_ENABLE_BT = 3;
private ListView mConversationView;
private EditText mOutEditText;
private Button mSendButton;
private String mConnectedDeviceName = null;
private String mConnectedDeviceAddress = null;
private ArrayAdapter<String> mConversationArrayAdapter;
private StringBuffer mOutStringBuffer;
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothService mMessage = null;
private Context context;
boolean mBound = false;
#Override
public Context getContext() {
return context;
}
public void setContext(Context context) {
this.context = context;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mName = new NameMappingDataSource(getActivity());
deviceAutoConnect = new DeviceAutoConnectDataSource(getActivity());
activateDatasource = new ActivateDatasource(getActivity());
setHasOptionsMenu(true);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
FragmentActivity activity = getActivity();
Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show();
activity.finish();
}
}
#Override
public void onStart() {
super.onStart();
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else if (mMessage == null) {
setupChat();
}
}
#Override
public void onDestroy() {
super.onDestroy();
if (mMessage != null) {
mMessage.stop();
}
}
#Override
public void onResume() {
super.onResume();
if (mMessage != null) {
if (mMessage.getState() == BluetoothService.STATE_NONE) {
mMessage.start();
}
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_bluetooth_chat, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
mConversationView = (ListView) view.findViewById(R.id.in);
mOutEditText = (EditText) view.findViewById(R.id.edit_text_out);
mSendButton = (Button) view.findViewById(R.id.button_send);
}
private void setupChat() {
mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message);
mConversationView.setAdapter(mConversationArrayAdapter);
mOutEditText.setOnEditorActionListener(mWriteListener);
mSendButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
View view = getView();
if (null != view) {
TextView textView = (TextView) view.findViewById(R.id.edit_text_out);
String message = textView.getText().toString();
sendMessage(message.getBytes());
}
}
});
final Button testButton = (Button) getActivity().findViewById(R.id.button1);
testButton.setTag(1);
testButton.setBackgroundResource(R.drawable.open);
testButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final int status = (Integer) v.getTag();
if (status == 1) {
v.setTag(0);
} else {
testButton.setBackgroundResource(R.drawable.open);
v.setTag(1);
}
}
});
mMessage = new BluetoothService(getActivity(), mHandler);
mOutStringBuffer = new StringBuffer("");
}
private void ensureDiscoverable() {
if (mBluetoothAdapter.getScanMode() !=
BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
public void sendMessage(byte[] message) {
if (mMessage.getState() != BluetoothService.STATE_CONNECTED) {
Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
return;
}
if (message.length > 0) {
mMessage.write(message);
mOutStringBuffer.setLength(0);
mOutEditText.setText(mOutStringBuffer);
}
}
private TextView.OnEditorActionListener mWriteListener
= new TextView.OnEditorActionListener() {
public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
// If the action is a key-up event on the return key, send the message
if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
String message = view.getText().toString();
sendMessage(message.getBytes());
}
return true;
}
};
private void setStatus(int resId) {
FragmentActivity activity = getActivity();
if (null == activity) {
return;
}
final ActionBar actionBar = activity.getActionBar();
if (null == actionBar) {
return;
}
actionBar.setSubtitle(resId);
}
private void setStatus(CharSequence subTitle) {
FragmentActivity activity = getActivity();
if (null == activity) {
return;
}
final ActionBar actionBar = activity.getActionBar();
if (null == actionBar) {
return;
}
actionBar.setSubtitle(subTitle);
}
private final Handler mHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
int t = 0;
FragmentActivity activity = getActivity();
switch (msg.what) {
case Constants.MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case BluetoothService.STATE_CONNECTED:
setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));
mConversationArrayAdapter.clear();
break;
case BluetoothService.STATE_CONNECTING:
setStatus(R.string.title_connecting);
break;
case BluetoothService.STATE_LISTEN:
case BluetoothService.STATE_NONE:
setStatus(R.string.title_not_connected);
break;
}
break;
case Constants.MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
mConversationArrayAdapter.add("Me: " + writeBuf);
break;
case Constants.MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
String readMessage = new String(readBuf, 0, msg.arg1);
mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage);
break;
case Constants.MESSAGE_DEVICE_NAME:
mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME);
mConnectedDeviceAddress = msg.getData().getString(Constants.DEVICE_ADDRESS);
if (null != activity) {
Toast.makeText(activity, "Connected to "
+ mConnectedDeviceName, Toast.LENGTH_SHORT).show();
}
break;
case Constants.MESSAGE_TOAST:
if (null != activity) {
Toast.makeText(activity, msg.getData().getString(Constants.TOAST),
Toast.LENGTH_SHORT).show();
mConnectedDeviceAddress=null;
}
break;
}
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CONNECT_DEVICE_SECURE:
if (resultCode == Activity.RESULT_OK) {
connectDevice(data, true);
}
break;
case REQUEST_CONNECT_DEVICE_INSECURE:
if (resultCode == Activity.RESULT_OK) {
connectDevice(data, false);
}
break;
case REQUEST_ENABLE_BT:
if (resultCode == Activity.RESULT_OK) {
setupChat();
} else {
Log.d(TAG, "BT not enabled");
Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving,
Toast.LENGTH_SHORT).show();
getActivity().finish();
}
}
}
private void connectDevice(Intent data, boolean secure) {
String address = data.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
mMessage.connect(device, secure);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.bluetooth_chat, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.secure_connect_scan: {
Intent serverIntent = new Intent(this.context, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE);
return true;
}
case R.id.insecure_connect_scan: {
Intent serverIntent = new Intent(this.context, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE);
return true;
}
case R.id.discoverable: {
ensureDiscoverable();
return true;
}
case R.id.menu_user: {
if(mConnectedDeviceAddress!=null) {
mName.open();
List<DisplayNameMapping> str = mName.getDisplayNameMappingLiked(mConnectedDeviceAddress);
mName.close();
String setname = str.get(0).getDisplay_name();
showInputDialogCheckPWAdminUser(setname, mConnectedDeviceAddress);
}
return true;
}
case R.id.menu_history: {
Intent userIntent = new Intent(getActivity(),UserListActivity.class);
userIntent.putExtra("addressdevice", mdeviceaddress);
startActivity(userIntent);
}
}
return false;
}
}
How to send message to here used connection of bletoothfragment.class
Please help me. I don't know
public class UserListActivity extends Activity implements UserListAdapter.customButtonListener {
Button btnadduser,btnconfig;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context=this;
getActionBar().setDisplayHomeAsUpEnabled(true);
userdata = new UserDataSource(this);
namedata = new NameMappingDataSource(this);
userdevicedata=new UserDeviceDatasource(this);
setContentView(R.layout.activity_user_list);
btnconfig=(Button) findViewById(R.id.btnconfig);
btnconfig.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
'How to send message to here used connection of bletoothfragment.class '
} catch (Exception ex) {
}
}
});
}
public void onButtonClickListner(int position, String value) {
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}

You can save last connected device address and then you can use it.
String address = intent.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
// Get the BluetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
mChatService.connect(device, secure);

Call another Activity in Main Activity

sorry my question is may be very simple for all of you. But I am new and need solution for it. If you can help me for solve it.
I have one quote application which have function for check new quote from server in main activity, its checking with server on loading Main Activity that there new quotes available or not and if available its opening one popup window for go setting activity for download new quotes, and if user press setting button than its taking user to setting activity. I need some changes in it. I want automatic download new quotes from main activity without go setting activity. both activity are like below
Thanks
public class MainActivity extends Activity {
SharedPreferences mSharedPreferences;
//String qotdId;
private AdView mAdView;
private InterstitialAd mInterstitial;
public static boolean active;
DAO db;
String siteUrl, updatesUrl;
int lastAuthor, lastQuote;
private ConnectionDetector cd;
#Override
protected void onStart() {
mInterstitial = new InterstitialAd(this);
mInterstitial.setAdUnitId(getResources().getString(R.string.admob_publisher_interstitial_id));
mInterstitial.loadAd(new AdRequest.Builder().build());
super.onStart();
active = true;
}
#Override
protected void onStop() {
super.onStop();
active = false;
}
// ==============================================================================
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mAdView = (AdView) findViewById(R.id.adView);
mAdView.loadAd(new AdRequest.Builder().build());
/* Boolean isFirstRun = getSharedPreferences("PREFERENCE", MODE_PRIVATE)
.getBoolean("isFirstRun", true);
if (isFirstRun) {
//show start activity
startActivity(new Intent(MainActivity.this, SettingsActivity.class));
Toast.makeText(MainActivity.this, "Please Push Download Button And Save Status in Your Mobile For Just One Time", Toast.LENGTH_LONG)
.show();
}
getSharedPreferences("PREFERENCE", MODE_PRIVATE).edit()
.putBoolean("isFirstRun", false).commit();
*/
// Parse push notification
Parse.initialize(this, getString(R.string.parse_application_id), getString(R.string.parse_client_key));
ParseAnalytics.trackAppOpened(getIntent());
PushService.setDefaultPushCallback(this, MainActivity.class);
ParseInstallation.getCurrentInstallation().saveInBackground();
db = new DAO(this);
db.open();
cd = new ConnectionDetector(MainActivity.this);
siteUrl = getResources().getString(R.string.siteUrl);
updatesUrl = siteUrl + "site/get_updates/" + String.valueOf(lastAuthor) + "/" + String.valueOf(lastQuote);
if (cd.isConnectingToInternet()) {
// Internet Connection is not present
Intent checkUpdates = new Intent(MainActivity.this, CheckUpdatesService.class);
startService(checkUpdates);
}
// generateKeyHash();
final ImageButton quotes = (ImageButton) findViewById(R.id.quotes);
quotes.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,
QuotesActivity.class);
intent.putExtra("quotesType", 1);
intent.putExtra("itemSelected", 0);
startActivity(intent);
}
});
final ImageButton authors = (ImageButton) findViewById(R.id.authors);
authors.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,
AuthorsActivity.class);
startActivity(intent);
}
});
final ImageButton favorites = (ImageButton) findViewById(R.id.favorites);
favorites.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,
QuotesActivity.class);
intent.putExtra("quotesType", 2);
startActivity(intent);
}
});
final ImageButton settings = (ImageButton) findViewById(R.id.settings);
settings.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,
SettingsActivity.class);
startActivity(intent);
}
});
}
}
And my other activity
public class SettingsActivity extends PreferenceActivity {
static final int TIME_DIALOG_ID = 999;
private AdView mAdView;
private InterstitialAd mInterstitial;
private static final String MY_PREFERENCES = "my_preferences";
#Override
protected void onStart() {
mInterstitial = new InterstitialAd(this);
mInterstitial.setAdUnitId(getResources().getString(R.string.admob_publisher_interstitial_id));
mInterstitial.loadAd(new AdRequest.Builder().build());
super.onStart();
}
#Override
protected void onStop() {
//unregisterReceiver(receiver);
super.onStop();
}
// ==========================================================================================================//
DAO db;
// Progress dialog
ProgressDialog pDialog;
PreferenceScreen preferenceScreen;
private static SharedPreferences mSharedPreferences;
UpdateClass update;
// Internet Connection detector
private ConnectionDetector cd;
// Alert Dialog Manager
AlertDialogManager alert = new AlertDialogManager();
Preference more, rate, about, check, share,status,background, progress = null;
PreferenceCategory socialsCategory;
private MyDownloadReceiver receiver;
// ==============================================================================
//////////////////// First Load /////////////////
public static boolean isFirst(Context context){
final SharedPreferences reader = context.getSharedPreferences(MY_PREFERENCES, Context.MODE_PRIVATE);
final boolean first = reader.getBoolean("is_first", true);
if(first){
final SharedPreferences.Editor editor = reader.edit();
editor.putBoolean("is_first", false);
editor.commit();
}
return first;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.config);
mAdView = (AdView) findViewById(R.id.adView);
mAdView.loadAd(new AdRequest.Builder().build());
//TWITTER_CONSUMER_KEY = getResources().getString(
// R.string.TWITTER_CONSUMER_KEY);
//TWITTER_CONSUMER_SECRET = getResources().getString(
// R.string.TWITTER_CONSUMER_SECRET);
//TWITTER_CALLBACK_URL = "oauth://"
// + getApplicationContext().getPackageName()
// + ".SettingsActivity";
//uiHelper = new UiLifecycleHelper(this, callback);
//uiHelper.onCreate(savedInstanceState);
db = new DAO(this);
db.open();
addPreferencesFromResource(R.layout.settings);
// Shared Preferences
mSharedPreferences = getApplicationContext().getSharedPreferences(
"MyPref", 0);
check = (Preference) findPreference("check");
about = (Preference) findPreference("about");
more = (Preference) findPreference("more");
rate = (Preference) findPreference("rate");
status = (Preference) findPreference("status");
share = (Preference) findPreference("share");
background = (Preference) findPreference("background");
socialsCategory = (PreferenceCategory) findPreference("socials");
preferenceScreen = getPreferenceScreen();
check.setOnPreferenceClickListener(new OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
update = new UpdateClass(SettingsActivity.this);
update.handleUpdates();
//if (mInterstitial.isLoaded()) {
// mInterstitial.show();
//}
return false;
}
});
// ==============================================================================
about.setOnPreferenceClickListener(new OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
Intent intent = new Intent(SettingsActivity.this,
AboutActivity.class);
startActivity(intent);
if (mInterstitial.isLoaded()) {
mInterstitial.show();
}
return false;
}
});
// ==============================================================================
background
.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference,
Object newValue) {
if (newValue.equals(true)) {
db.updateSetting("background", "1");
} else {
db.updateSetting("background", "0");
}
return true;
}
});
// ==============================================================================
// ==============================================================================
rate.setOnPreferenceClickListener(new OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
final String appPackageName = "com.karopass.hindishayari2016";
try {startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id="+ appPackageName)));
} catch (android.content.ActivityNotFoundException anfe) {
startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse("http://play.google.com/store/apps/details?id="+ appPackageName)));
}
return true;
}
});
// ==============================================================================
more.setOnPreferenceClickListener(new OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
final String developerName = "karopass";
try {startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q="+ developerName)));
} catch (android.content.ActivityNotFoundException anfe) {
startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse("https://play.google.com/store/search?q="+ developerName)));
}
return true;
}
});
share.setOnPreferenceClickListener(new OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
sharingIntent.setType("text/plain");
String shareBody = "आज ही डाउनलोड करे हिंदी शायरी एप्लीकेशन और पाइए बेस्ट हिंदी शायरी.इस एप्लीकेशन में 3000 से भी ज्यादा बढ़िया हिंदी शायरी का कलेक्शन है जिसे आप पढने या शेर करने के लिए यूज कर सकते है !! आज ही डाउनलोड करे !! http://play.google.com/store/apps/details?id=com.karopass.hindishayari2016";
sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, " ");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
startActivity(Intent.createChooser(sharingIntent, "Share via"));
return false;
}
});
// ==============================================================================
status.setOnPreferenceClickListener(new OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
final String appPackageName = "com.karopass.hindi_status_2016";
try {startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id="+ appPackageName)));
} catch (android.content.ActivityNotFoundException anfe) {
startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse("http://play.google.com/store/apps/details?id="+ appPackageName)));
}
return true;
}
});
// ==============================================================================
IntentFilter filter = new IntentFilter(MyDownloadReceiver.ACTION);
filter.addCategory(Intent.CATEGORY_DEFAULT);
receiver = new MyDownloadReceiver();
registerReceiver(receiver, filter);
}
void showProgressBar() {
progress = new MyProgressBarPreference(this);
preferenceScreen.addPreference(progress);
}
void setDownloadProgress(int percent) {
if (progress != null) {
((MyProgressBarPreference)progress).setProgress(percent);
((MyProgressBarPreference)progress).setLabel("Please wait... " +percent + "%"+" Downloading Done");
}
}
void hideProgressBar()
{
if (progress != null)
preferenceScreen.removePreference(progress);
}
public class MyDownloadReceiver extends BroadcastReceiver {
public static final String ACTION = "com.karopass.hindishayari2016.intent.action.DOWNLOAD";
public static final int INITIALIZE = 0x001;
public static final int DOWNLOAD = 0x002;
public static final int FINISH = 0x003;
public static final String EXTRA_STATUS = "status";
public static final String EXTRA_PERCENT = "percent";
#Override
public void onReceive(Context context, Intent intent) {
int status = intent.getIntExtra(EXTRA_STATUS, -1);
Log.d("DESOLF", "receive broadcast : " + status);
switch(status) {
case INITIALIZE:
showProgressBar();
break;
case DOWNLOAD:
int percent = intent.getIntExtra(MyDownloadReceiver.EXTRA_PERCENT, 0);
setDownloadProgress(percent);
break;
case FINISH:
hideProgressBar();
//Toast.makeText(SettingsActivity.this, "Downloaded successfully", Toast.LENGTH_LONG).show();
if (mInterstitial.isLoaded()) {
mInterstitial.show();
}
break;
default:
}
}
}
public class MyProgressBarPreference extends Preference {
public MyProgressBarPreference(Context context) {
super(context);
}
public MyProgressBarPreference(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyProgressBarPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private ImageView mStatusIcon;
private ProgressBar mProgressBar;
private TextView mStatusText ;
private int lastReqProgress=-1;
private int lastReqMax=-1;
private String lastLabel;
#Override
protected View onCreateView(ViewGroup parent) {
LayoutInflater li = (LayoutInflater) getSystemService(Service.LAYOUT_INFLATER_SERVICE);
View myLayout=li.inflate(R.layout.download_progress, null, false);
RotateAnimation anim = new RotateAnimation(0.0f, 360.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
anim.setInterpolator(new LinearInterpolator());
anim.setRepeatCount(Animation.INFINITE);
anim.setDuration(700);
mStatusIcon = (ImageView) myLayout.findViewById(R.id.status_icon);
mStatusIcon.startAnimation(anim);
mProgressBar=(ProgressBar) myLayout.findViewById(R.id.status_progress);
mStatusText=(TextView) myLayout.findViewById(R.id.status_text);
mStatusIcon.setImageResource(R.drawable.rotate);
mProgressBar.setProgress(0);
mStatusText.setText(0 + "%");
return myLayout;
}
public void setIcon(int resId) {
mStatusIcon.setImageResource(resId);
}
public void setProgress(int value){
if (mProgressBar!=null){
mProgressBar.setProgress(value);
} else {
lastReqProgress=value;
}
}
public void setMax(int value){
if (mProgressBar!=null){
int savedprogress=mProgressBar.getProgress();
mProgressBar.setMax(0);
mProgressBar.setMax(value);
mProgressBar.setProgress(savedprogress);
} else {
lastReqMax=value;
}
}
public void setLabel(String text){
if (lastLabel!=null){
mStatusText.setText(text);
} else {
lastLabel=text;
}
}
}
}

You can try this code:
Intent i = new Intent(MainActivity.this, SecondActivity.class);
startActivity(i);
Don't forget to add your Second Activity in the AndroidManifest.xml:
<activity android:label="#string/app_name" android:name="SecondActivity"/>
Android Page

How to refresh the static value when activity executed again

Here there is an activity called groupchat. Here I am having the static object activeEventMO.
In this groupchat activity the chatting function is going on. If user1 send a message to user2 that message received by gcmIntent class. in this gcmIntent class I have added the code for notification. Here if user1 send a message for a particular event notification received for user2. If user2 clicks that notification it will take to the user to that chat window that means groupchat activity.
for that in gcmIntent class I used parcelable to send the eventMO to groupchat activity. if user1 send a message to user2 for event2 user2 receives a notification. if user2 clciks the notification it show the chatwindow of event1. because when first time I send the eventid1 by sing eventMO. So it holds the eventid1 forever. it cannot refreshed.
This is my groupchat activity code
public class GroupChatActivity extends Activity {
private static ListView listViewMessages;
private static List<ChatMO> listChatMessageObjectses = new ArrayList<ChatMO>();
private static MessagesListAdapter adapter;
private static Handler UIHandler;
private static int RESULT_LOAD_IMAGE = 1;
private EditText inputMsg;
private String formatDate;
private Context context;
private String dateResult;
private static EventMO activeEventMO = null;
private UserDelegate userDelegate = new UserDelegate();
private MediaDelegates mediaDelegates = new MediaDelegates();
private MessageDelegates messageDelegates = new MessageDelegates();
private SharedPreferences sharedpreferences;
private List<UserMO> eventUserMOs = new ArrayList<>();
private Gson gson = new Gson();
private UserMO userMO = new UserMO();
private MessageMO messageMO = new MessageMO();
private File imgFile;
private MediaMO mediaMO = new MediaMO();
// this method is for store the current event id to eventMO coz eventMO globally declared as static
public void getevent()
{
activeEventMO = (EventMO) getIntent().getParcelableExtra("eventMo");
}
public static void messageHandler(final MessageMO messageMo) {
UIHandler = new Handler(Looper.getMainLooper());
UIHandler.post(new Runnable() {
public void run() {
Log.e("messageHandler", messageMo.getEventTitle());
ChatMO chatMO = new ChatMO();
chatMO.setMessage(messageMo.getMessage());
chatMO.setSelf(0);
chatMO.setFromName(messageMo.getfromUserName());
chatMO.setDate(messageMo.getDate());
Log.e("handler", "eventMO" + activeEventMO);
Log.e("handler", "messageMO" + messageMo);
if (activeEventMO.getEventId() == messageMo.getEventId()) {
listChatMessageObjectses.add(chatMO);
listViewMessages.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
});
}
#Override
protected void onStart() {
super.onStart();
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putInt("APPSTATUS", 1);
editor.putLong("eventId", activeEventMO.getEventId());
editor.commit();
Log.i("App", "start");
AppActivityStatus.setActivityStarted();
AppActivityStatus.setActivityContext(context);
}
#Override
protected void onPause() {
super.onPause();
AppActivityStatus.setActivityStoped();
}
#Override
protected void onResume() {
super.onPause();
AppActivityStatus.setActivityStarted();
}
#Override
protected void onStop() {
super.onStop();
Log.i("App", "stop");
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putInt("APPSTATUS", 2);
editor.commit();
AppActivityStatus.setActivityStoped();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.image_upload, menu);
return true;
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
ChatMO chatMO = new ChatMO();
chatMO.setMessage_type(Constants.IS_TYPE_CHAT_IMAGE);
chatMO.setMessage(picturePath);
chatMO.setSelf(1);
chatMO.setIs_delete(0);
chatMO.setFromName("");
chatMO.setEvent_id(activeEventMO.getEventId());
messageMO.setMessage("");
messageMO.setRingeeUserId(userMO.getRingeeUserId());
// messageMO.setDate(messageMO.getDate());
messageMO.setMobileNumber(userMO.getMobileNumber());
messageMO.setEventId(activeEventMO.getEventId());
messageMO.setEventTitle(activeEventMO.getText());
Log.e("sendbutton", "eventtitle" + messageMO.getEventTitle());
messageMO.setfromUserName(userMO.getUserName());
messageMO.setMessageType(Constants.MESSAGE_TYPE_MSG);
mediaMO.setRingeeUserId(userMO.getRingeeUserId());
mediaMO.setIsType(Constants.IS_TYPE_CHAT_IMAGE);
imgFile = new File(picturePath);
listChatMessageObjectses.add(chatMO);
listViewMessages.setAdapter(adapter);
adapter.notifyDataSetChanged();
new AsyncTask<Void, Void, String>() {
#Override
protected String doInBackground(Void... arg0) {
return mediaDelegates.insertChatFile(context, imgFile, messageMO, eventUserMOs, mediaMO);
}
#Override
protected void onPostExecute(String mediaBo) {
Toast.makeText(getApplicationContext(), "uploaded Status" + mediaBo, Toast.LENGTH_LONG).show();
if (!mediaBo.equals("null")) {
MediaMO mediaMO1 = gson.fromJson(mediaBo, new TypeToken<MediaMO>() {
}.getType());
}
}
}.execute(null, null, null);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
// noinspection SimplifiableIfStatement
if (id == R.id.ic_menu_gallery) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
return super.onOptionsItemSelected(item);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final List<ChatMO> chatMOs1 = new ArrayList<>();
activeEventMO = new EventMO();
setContentView(R.layout.chat_main);
context = getApplicationContext();
String message = "";
DatabaseHelper dbHelper = new DatabaseHelper(context);
listChatMessageObjectses = chatMOs1;
inputMsg = (EditText) findViewById(R.id.inputMsg);
listViewMessages = (ListView) findViewById(R.id.list_view_messages);
activeEventMO = (EventMO) getIntent().getParcelableExtra("eventMo");
Log.e("oncreate", "eventMO" +activeEventMO);
List<ChatMO> chatMOs = dbHelper.getGroupChatMessageForEvent(activeEventMO.getEventId());
Log.e("oncreate", "chatMOs" + chatMOs);
for (ChatMO chatMO1 : chatMOs) {
message = chatMO1.getMessage();
chatMO1.getEvent_id();
chatMO1.getFromName();
int messageType = chatMO1.getMessage_type();
chatMO1.getDate();
chatMO1.isSelf();
if (messageType == 0) {
chatMOs1.add(chatMO1);
}
}
adapter = new MessagesListAdapter(context, chatMOs1);
//adapter functionality added for show the previous chat list of event/invite
listViewMessages.setAdapter(adapter);
sharedpreferences = getSharedPreferences(Constants.SHARED_PREFERENCE_NAME, context.MODE_PRIVATE);
// by default first primary user is current user in sql lite
// user table
userMO = dbHelper.getUserData(1);
here i am passing the eventMO in gcmIntent
Intent groupChatActFrag = new Intent(getApplicationContext(), GroupChatActivity.class);
EventMO eventMO = new EventMO();
eventMO.setEventId(messageMO.getEventId());
Log.e("gcm","evetid"+eventMO.getEventId());
groupChatActFrag.putExtra("eventMo", eventMO);
groupChatActFrag.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString("MessageMO", gson.toJson(messageMO));
editor.commit();
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, groupChatActFrag, 0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this).setSmallIcon(R.drawable.ic_dialog_info).setContentTitle(messageMO.getEventTitle())
.setStyle(new NotificationCompat.BigTextStyle().bigText(messageMO.getfromUserName())).setContentText(messageMO.getMessage()).setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
mBuilder.setContentIntent(contentIntent);
mBuilder.setAutoCancel(true);
Log.e("gcm","eventid"+messageMO.getEventId());
mNotificationManager.notify((int) (long) eventMO.getEventId(), mBuilder.build());
}
can you please tell me how to fix this issue thanks in advance

To refresh a variable after you activity or fragment has been destroyed you need to store in the saved bundled provided you in the method
public void onSavedInstanceState(final Bundle bundle)
And reset values with the bundle provided in the method
public void onCreate(final Bundle savedInstance)
Here is some good documentation
enter code here[Recreating an Activity - Android][1]