Develop Reference

findViewById respond "none"

I'm trying to getText() from EditText view in an AlertDialog.
In the main activity in the method onCreate() I set the button listener.
public class MainActivity2 extends AppCompatActivity {
private ActivityMain2Binding mainActivity2;
private ArrayAdapter adapter;
private ArrayList<simpleArrayAdapterElement> data;
private final static String KEY_TITLE = "title";
private final static String KEY_DESCRIPTION = "description";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mainActivity2 = ActivityMain2Binding.inflate(getLayoutInflater());
View view = mainActivity2.getRoot();
setContentView(view);
arrayAdapter();
mainActivity2.buttonIddItem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showCustomDialog();
}
});
// setupListViewSimple();
}
Then I call the showCustomDialog() in onClick.
private void showCustomDialog(){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(R.layout.custom_dialog);
builder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText alertDialogText = (EditText) findViewById(R.id.setText1);
System.out.println(alertDialogText.getText());
System.out.println(alertDialogText.getText().toString()); // just in case
}
});
builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
EditText alertDialogText = (EditText) findViewById(R.id.setText1); // return none
Here is my layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<EditText
android:id="#+id/setText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:ignore="MissingConstraints"
android:layout_marginTop="16dp"
android:hint="Type your name here:"
android:text="Some"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
*I also use binding in my activity.
What I'm doing wrong?

You are referring to MainActivity2 itself. you need to refer to its view by using LayoutInflater. You can check example answer here: https://stackoverflow.com/a/36793463/9346054
AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater inflater = this.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.custom_dialog, null);
builder.setView(dialogView);
builder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText alertDialogText = dialogView.findViewById(R.id.setText1);
System.out.println(alertDialogText.getText());
System.out.println(alertDialogText.getText().toString()); // just in case
}
});
builder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});

Add a dynamic button to the view and save it permanently

I have a fragment with this view:
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:tag="general"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#343535"
android:orientation="vertical"
tools:context=".fragments.GeneralFragment">
<Button
android:id="#+id/hello"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/hello" />
<Button
android:id="#+id/observed"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/observed" />
<Button
android:id="#+id/thanks"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/thanks" />
</LinearLayout>
There are 3 buttons. Whenever you click on one of them, its text will be displayed.
Now I would like to add another button but dynamically. It should be added before #+id/hello.
I have tried it with
LinearLayout root = (LinearLayout) view.findViewById(R.id.root);
root.addView();
but it looks completely wrong since some parameters are missing.
For instance, the new button should be like:
XML:
<Button
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="I am a dynamic text" />
This button should be saved permanently in the app. How can I do this?
Update
I am using a dialog, so this is the class:
#SuppressLint("ValidFragment")
public class Dialog extends DialogFragment {
private final int _layout;
private TextInputEditText _customTextField;
#SuppressLint("ValidFragment")
public Dialog(int layout) {
_layout = layout;
}
public interface ICustomTts {
void customTts(String input, Activity activity);
}
public ICustomTts iCustomTts;
public interface ITarget {
void getTarget(String input);
}
public ITarget iTarget;
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(_layout, container, false);
// Display fragment_custom
if (_layout == R.layout.fragment_custom) {
_customTextField = view.findViewById(R.id.customTextField);
Button _customBtn = view.findViewById(R.id.customCta);
_customBtn.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: Clicked on CTA of custom");
String input = _customTextField.getText().toString();
if (!input.equals("")) {
iCustomTts.customTts(input, getActivity());
_dismiss();
}
}
});
MaterialCheckBox customeSave = view.findViewById(R.id.customSave);
customeSave.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View v) {
Log.d(TAG, "customeSave was clicked!");
LinearLayout root = view.findViewById(R.id.root);
Button button = new Button(getContext());
float heightInPixel = 60 * getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) heightInPixel);
params.gravity = Gravity.CENTER;
button.setText("I am a dynamic text");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do the stuff on the click
}
});
root.addView(button, 0);
}
});
}
// Display fragment_target
if (_layout == R.layout.fragment_target) {
_customTextField = view.findViewById(R.id.targetTextField);
Button _customBtn = view.findViewById(R.id.targetCta);
_customBtn.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: Clicked on CTA of target");
String input = _customTextField.getText().toString();
if (!input.equals("")) {
iTarget.getTarget(input);
_dismiss();
}
}
});
}
return view;
}
/**
* Dismissing the dialog
*/
private void _dismiss() {
this.dismiss();
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
try {
if (_layout == R.layout.fragment_custom) {
iCustomTts = (ICustomTts) getActivity();
}
else if (_layout == R.layout.fragment_target) {
iTarget = (ITarget) getActivity();
}
}
catch (ClassCastException e) {
Log.e(TAG, "onAttach: ClassCastException: " + e.getMessage());
}
}
}

You need to use the two-argument version of addView() to determine the order (index) of the button inside the LinearLayout:
LinearLayout root = view.findViewById(R.id.root);
Button button = new Button(requireContext());
float heightInPixel = 60 * getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) heightInPixel);
params.gravity = Gravity.CENTER;
button.setText("I am a dynamic text");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do the stuff on the click
}
});
root.addView(button, 0);

Navigation drawer takes time to open and close

I have added navigation view and drawer layout in my app. When I open and close the drawer it lags in time. opens and close slowly. I got this issue prominently on version 4.4 also on 6.0 but not as prominently as 4.4.
When I am running on 4.4 device as I open the drawer I noticed messages in log that too much work may be doing on main thread.
So I tried to comment all the code except the navigation drawer and options menu code. So after that I found it was working bit well.
Is it the issue? or some memory issue can be there? But on larger memory devices also I found the problem.
Do I need to create another activity for other code? So that drawer will work faster?
I also tried to create a fragment and replaced it in framelayout of main activity to separate the code. But it was still lagging.
If I create new activity still I need all the navigation code in that activity, it will be again a same thing.
I am not getting what can be the issue. Can anyone please help.. Thank you..
Here is code:
public class MainActivity extends AppCompatActivity implements GetContactsAsyncTask.ContactGetCallBack,UpdateUserAsyncTask.UpdateUserCallBack {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactDb = new ContactTableHelper(MainActivity.this);
mDb = new UserTableHelper(MainActivity.this);
boolean result = Utility.checkAndRequestPermissions(MainActivity.this);
LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver,
new IntentFilter(REGISTRATION_COMPLETE));
LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver,
new IntentFilter(PUSH_NOTIFICATION));
NotificationUtils.clearNotifications(getApplicationContext());
sharedpreferences = getSharedPreferences("UserProfile", Context.MODE_PRIVATE);
mUserId = sharedpreferences.getString("userId", "");
firstTimeLogin = sharedpreferences.getBoolean("login", false);
refreshedToken = sharedpreferences.getString("deviceId", "");
parentLayout = (LinearLayout) findViewById(R.id.toolbar_container);
setupView();
mUser = new User();
url = sharedpreferences.getString("url", "");
contactList = new ArrayList<Contact>();
txtuserName = (TextView) findViewById(R.id.txtusername);
txtmobile = (TextView) findViewById(R.id.txtmobile);
profileImageView = (CircleImageView) findViewById(R.id.thumbnail);
if (profileImageView != null) {
profileImageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
drawerLayout.closeDrawers();
Intent Intent = new Intent(MainActivity.this, ProfileActivity.class);
Intent.putExtra("user", mUser);
Intent.putExtra("url", url);
startActivity(Intent);
}
});
}
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getPath(), bmOptions);
if (bitmap != null) {
profileImageView.setImageBitmap(bitmap);
} else {
profileImageView.setImageDrawable(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_account_circle_white_48dp));
}
ImageView sync = (ImageView) findViewById(R.id.sync);
sync.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
contactList.clear();
contactDb.deleteAllContacts();
GetContactsAsyncTask getContactsAsyncTask = new GetContactsAsyncTask(MainActivity.this, MainActivity.this, mUserId, MainActivity.this);
getContactsAsyncTask.execute(mUserId);
}
});
}
void setupView() {
File sd = Environment.getExternalStorageDirectory();
image = new File(sd + "/Profile", "Profile_Image.png");
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
navigationView = (NavigationView) findViewById(R.id.navigation_view);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
drawerLayout.closeDrawers();
menuItem.setChecked(true);
FragmentManager fragmentManager = getSupportFragmentManager();
switch (menuItem.getItemId()) {
case R.id.nav_menu_contacts:
fragmentManager.beginTransaction().replace(R.id.container, fragment).commit();
break;
case R.id.nav_menu_settings:
Intent i = new Intent(MainActivity.this, PreferencesActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(i);
break;
case R.id.nav_log_out:
SharedPreferences pref = getSharedPreferences("UserProfile", MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.remove("UserUsername");
editor.remove("userId");
editor.remove("url");
editor.remove("login");
editor.remove("company");
editor.remove("emailId");
editor.remove("profileImage");
editor.remove("fullName");
editor.remove("homeAddress");
editor.remove("workAddress");
editor.remove("workPhone");
editor.remove("pass");
editor.remove("jobTitle");
editor.remove("mobileNo");
editor.commit();
mDb.deleteAllUsers();
contactDb.deleteAllContacts();
UpdateTokenAsyncTask updateTokenAsyncTask = new UpdateTokenAsyncTask(MainActivity.this, mUserId, "");
updateTokenAsyncTask.execute(mUserId, "");
finish();
i = new Intent(MainActivity.this, LoginActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(i);
break;
case R.id.nav_invite:
i = new Intent(MainActivity.this, InviteContactsActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(i);
break;
}
return true;
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.main_toolbar);
TextView mTitle = (TextView) findViewById(R.id.toolbar_title);
final ImageView menu = (ImageView) findViewById(R.id.menu);
menu.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
PopupMenu popup = new PopupMenu(MainActivity.this, menu);
popup.getMenuInflater().inflate(R.menu.main_pop_up_menu, popup.getMenu());
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
if (item.getItemId() == R.id.pendingInvites) {
startActivity(new Intent(MainActivity.this, PendingInvitesActivity.class));
} else if (item.getItemId() == R.id.feedback) {
final MaterialDialog dialog = new MaterialDialog.Builder(MainActivity.this)
.title("Feedback")
.customView(R.layout.feedback_dialog, true).build();
positiveAction = dialog.getActionButton(DialogAction.POSITIVE);
edtName = (EditText) dialog.getCustomView().findViewById(R.id.editName);
edtEmailId = (EditText) dialog.getCustomView().findViewById(R.id.editTextEmailId);
edtComment = (EditText) dialog.getCustomView().findViewById(R.id.editTextComment);
buttonSave = (Button) dialog.getCustomView().findViewById(R.id.buttonSave);
buttonSave.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
View view1 = getCurrentFocus();
if (view1 != null) {
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view1.getWindowToken(), 0);
}
mName = String.valueOf(edtName.getText().toString());
mEmailId = String.valueOf(edtEmailId.getText().toString());
mComment = String.valueOf(edtComment.getText().toString());
if (mComment.equals("")) {
showAlert("Please enter comments.");
} else if (mEmailId.equals("")) {
showAlert("Please enter an email-id.");
} else {
if (!isValidEmail(mEmailId)) {
showAlert("Please enter valid email id.");
} else {
HashMap<String, String> params = new HashMap<String, String>();
params.put("name", mName);
params.put("email_id", mEmailId);
params.put("comment", mComment);
CreateFeedbackAsyncTask createFeedbackAsyncTask = new CreateFeedbackAsyncTask(MainActivity.this, MainActivity.this);
createFeedbackAsyncTask.execute(params);
dialog.dismiss();
}
}
}
});
edtName.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
positiveAction.setEnabled(s.toString().trim().length() > 0);
}
#Override
public void afterTextChanged(Editable s) {
View view = getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
});
edtComment.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
positiveAction.setEnabled(s.toString().trim().length() > 0);
View view = getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
#Override
public void afterTextChanged(Editable s) {
}
});
edtEmailId.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
positiveAction.setEnabled(s.toString().trim().length() > 0);
View view = getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
#Override
public void afterTextChanged(Editable s) {
}
});
dialog.show();
positiveAction.setEnabled(false);
return true;
}
return true;
}
});
popup.show();//showing popup menu
}
});
if (toolbar != null) {
toolbar.setTitle("");
setSupportActionBar(toolbar);
}
if (toolbar != null) {
toolbar.setNavigationIcon(R.drawable.ic_menu_white_24dp);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
drawerLayout.openDrawer(GravityCompat.START);
}
});
}
}
#Override
public void doPostExecute(JSONArray response) throws JSONException {
contactListArray = response;
contactDb = new ContactTableHelper(MainActivity.this);
if (null == contactList) {
contactList = new ArrayList<Contact>();
}
for (int i = 0; i < contactListArray.length(); i++) {
JSONObject subObject1 = contactListArray.getJSONObject(i);
Contact contact = new Contact();
JSONObject subObject = subObject1;
String contactName = subObject.getString("user_name");
//name of the attribute in response
String pass = subObject.getString("password");
String contactId = subObject.getString("user_id");
String contactMobile = subObject.getString("mobile_no");
String contactEmailId = subObject.getString("email_id");
String contactProfile = subObject.getString("profile_image");
String fullName = subObject.getString("full_name");
String jobTitle = subObject.getString("job_title");
String homeAddress = subObject.getString("home_address");
String workPhone = subObject.getString("work_phone");
String workAddress = subObject.getString("work_address");
String company = subObject.getString("company");
contact.setmThumbnail(contactProfile);
contact.setmUserName(contactName);
contact.setmMobileNo(contactMobile);
contact.setmEmailId(contactEmailId);
contact.setmProfileImage(contactProfile);
contact.setContactId(contactId);
contact.setmHomeAddress(homeAddress);
contact.setmFullName(fullName);
contact.setmJobTitle(jobTitle);
contact.setmWorkAddress(workAddress);
contact.setmWorkPhone(workPhone);
contact.setmPass(pass);
contact.setmCompany(company);
contactList.add(contact);//adding string to arraylist
contactDb.addContact(new Contact(contactId, contactName, pass, contactMobile, contactEmailId, contactProfile, fullName, jobTitle, workAddress, workPhone, homeAddress, company));
}
adapter = new ContactAdapter(MainActivity.this, contactList);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setItemViewCacheSize(20);
recyclerView.setDrawingCacheEnabled(true);
recyclerView.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
}
#Override
public void onResume() {
super.onResume();
contactList.clear();
if (!firstTimeLogin) {
contactList.clear();
contactList = contactDb.getAllContacts();
mUser = mDb.getUser(mUserId);
txtuserName.setText(mUser.getmUserName());
txtmobile.setText(mUser.getmMobileNo());
} else {
new GetUserAsyncTask1(MainActivity.this,mUserId).execute(mUserId);
new GetContactsAsyncTask(this, MainActivity.this, mUserId, MainActivity.this).execute();
firstTimeLogin = false;
SharedPreferences.Editor editor = getSharedPreferences("UserProfile", MODE_PRIVATE).edit();
editor.putBoolean("login", firstTimeLogin);
editor.commit();
}
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(MainActivity.this);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
recyclerView.setItemAnimator(new DefaultItemAnimator());
adapter = new ContactAdapter(MainActivity.this, contactList);
recyclerView.setAdapter(adapter);
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(MainActivity.this, recyclerView, new ClickListener() {
#Override
public void onClick(View view, int position) {
final Contact contact = contactList.get(position);
}
#Override
public void onLongClick(View view, int position) {
}
}));
}
#Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case REQUEST_ID_MULTIPLE_PERMISSIONS: {
Map<String, Integer> perms = new HashMap<String, Integer>();
perms.put(Manifest.permission.WRITE_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.CAMERA, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.READ_CONTACTS, PackageManager.PERMISSION_GRANTED);
perms.put(Manifest.permission.SEND_SMS, PackageManager.PERMISSION_GRANTED);
for (int i = 0; i < permissions.length; i++)
perms.put(permissions[i], grantResults[i]);
if (perms.get(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.SEND_SMS) == PackageManager.PERMISSION_GRANTED
&& perms.get(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
} else {
showAlert("Some Permissions are Denied.");
}
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
#Override
public void doPostExecute(JSONObject response, Boolean update) throws JSONException {
}
}
Main layout :
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container">
</FrameLayout>
<!-- Your normal content view -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id = "#+id/toolbar_container">
<!-- We use a Toolbar so that our drawer can be displayed
in front of the action bar -->
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/Contacts"
android:layout_gravity="center"
android:id="#+id/toolbar_title"
android:textSize="20sp"
android:textColor="#ffffff"
android:textStyle="bold"
android:textAlignment="center"
android:gravity="center_vertical|center|center_horizontal"
android:layout_toLeftOf="#+id/sync"
android:layout_toStartOf="#+id/sync"
android:layout_centerInParent="true"
android:layout_marginLeft="30dp"
android:layout_marginRight="10dp" />
<ImageView
android:layout_width="24dp"
android:layout_height="24dp"
android:background="#drawable/ic_refresh_white_24dp"
android:id="#+id/sync"
android:layout_gravity = "right"
android:layout_toStartOf="#+id/menu"
android:layout_toLeftOf="#+id/menu"
android:layout_centerVertical="true"
android:layout_alignParentRight="false"
android:layout_marginRight="10dp" />
<ImageView
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_gravity= "end"
android:layout_marginRight="10dp"
android:background="#drawable/ic_more_vert_white_36dp"
android:id="#+id/menu"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
<view
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
class="android.support.v7.widget.RecyclerView"
android:id="#+id/recycler_view"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true" />
<!-- The rest of your content view -->
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="?attr/colorPrimary"
app:headerLayout="#layout/drawer_header"
app:itemTextColor="#color/yourColor"
app:itemIconTint="#color/yourColor"
app:menu="#menu/nav_menu" >
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
layout="#layout/drawer_header"
android:layout_width="match_parent"
android:layout_height="103dp" />
<ExpandableListView
android:id="#+id/elvGuideNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:groupIndicator="#null"
/>
</LinearLayout>
</android.support.design.widget.NavigationView>

Do the Json Parsing and adding the Entries into the DB also in Background Thread and Pass only the ArrayList of Entries to the Main Thread, this way you can reduce the Load on the Main Thread.
Another thing you can try is Enabling hardwareAcceleration to true

Definitely try to move any database operations on another threads. Decoding that bitmap in onCreate() also is dangerous.
Maybe organising your code will help a bit.

Making userInput from main activity to display on second activity in Android

I've seen a few related topics on here but after many attempts I just couldn't seem to find the solution so hopefully someone out there can help. Here's my code so far (Trying to make userInput appear on the 2nd activity as the result):
MainActivity.java
package winfield.joe.wind.v1;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends Activity {
// public var
private EditText text;
// default func
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Toast.makeText(this, "onCreate!", Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_main);
// findViewById = Finds a view that was identified by the id attribute
// from the XML that was processed in onCreate(Bundle).
// (EditText) = typecast
text = (EditText) findViewById(R.id.userInput);
}
//Will be executed by clicking on the calculate button because we assigned "calc" to the "onClick" Property
public void calc(View view) {
RadioButton toKilometers = (RadioButton) findViewById(R.id.toKilometers);
RadioButton toKnots = (RadioButton) findViewById(R.id.toKnots);
if (text.getText().length() == 0) {
// if the text field is empty show the message "enter a valid number" via toast message
Toast.makeText(this, "enter a valid number", Toast.LENGTH_LONG).show();
} else {
int userInput = R.string.userInput;
Intent i = new Intent(MainActivity.this, SecondActivity.class);
i.putExtra("userInput", userInput);
startActivityForResult(i, 0);
startActivity(i);
// parse input Value from Text Field
double inputValue = Double.parseDouble(text.getText().toString());
// convert to...
if (toKilometers.isChecked()) {
text.setText(String.valueOf(convertToKM(inputValue)));
// uncheck "to km" Button
toKilometers.setChecked(false);
// check "to knots" Button
toKnots.setChecked(true);
} else { /* if toKnots button isChecked() */
text.setText(String.valueOf(convertToKnots(inputValue)));
// uncheck "to knots" Button
toKnots.setChecked(false);
// check "to km" Button
toKilometers.setChecked(true);
}
}
}
/*private void putExtra(String string, int result) {
// TODO Auto-generated method stub
}*/
private double convertToKM(double inputValue) {
// convert knots to km
return (inputValue * 1.8);
}
private double convertToKnots(double inputValue) {
// convert km to knots
return (inputValue * 0.539956803);
}
}
SecondActivity.java
package winfield.joe.wind.v1;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class SecondActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Toast.makeText(this, "onCreate!", Toast.LENGTH_LONG).show();
setContentView(R.layout.activity_main);
Intent i = getIntent();
String userInput = i.getStringExtra("userInput");
}
//onClick GoBack method assigned to the Go Back? button which returns the user to main activity from the second activity
public void GoBack(View view) {
//AlertDialog appears upon the onclick of the go back button
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Are you sure?");
// set dialog message
builder .setCancelable(false)
.setPositiveButton("Convert Again",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
//You return to Main Activity
Intent intent = new Intent(SecondActivity.this, MainActivity.class);
startActivity(intent);
}
})
.setNeutralButton("Back to Home",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
//You return to the home page
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);
}
})
.setNegativeButton("View Results",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, just close the dialog box and do nothing
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:background="#color/bgColor"
android:orientation="vertical">
<!--TITLE-->
<TextView
android:id="#+id/titleMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="22dp"
android:gravity="center"
android:text="#string/titleMain"
android:textColor="#color/textColor"
android:textColorHint="#color/textColor"
android:textColorLink="#ffffff"
android:textSize="30sp" />
<!--USER-INPUT-->
<EditText
android:id="#+id/userInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:ems="10"
android:hint="#+string/userInput"
android:inputType="numberDecimal"
android:paddingEnd="40dp"
android:paddingStart="20dp"
android:paddingTop="30dp" >
<requestFocus />
</EditText>
<!--TWO RADIO BUTTONS-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingRight="10dp">
<!--toKNOTS-->
<RadioButton
android:id="#+id/toKnots"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:layout_weight="0.04"
android:checked="true"
android:text="#string/toKnots" />
<!--toKM-->
<RadioButton
android:id="#+id/toKilometers"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginEnd="20dp"
android:layout_marginTop="10dp"
android:text="#string/toKilometers" />
</LinearLayout>
<!--CALCULATE-->
<Button
android:id="#+id/calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginStart="10dp"
android:layout_marginTop="30dp"
android:onClick="calc"
android:text="#string/calc" />
</LinearLayout>
activity_second.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:background="#color/bgColor"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >
<!-- TITLE -->
<TextView
android:id="#+id/titleResults"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="24dp"
android:gravity="center"
android:text="#string/titleResults"
android:textColor="#color/textColor"
android:textColorHint="#color/textColor"
android:textColorLink="#ffffff"
android:textSize="25sp" />
<TextView
android:id="#+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="20dp"
android:layout_marginTop="30dp"
android:ems="10"
android:hint="#string/result"
android:textColorHint="#color/textColor" >
<requestFocus />
</TextView>
<Button
android:id="#+id/GoBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="40dp"
android:text="#string/GoBack"
android:onClick="GoBack" />
</LinearLayout>

Change this...
int userInput = R.string.userInput;
...to...
String userInput = text.getText().toString();
Everything in the R.java file is a static final int which is used to reference a resource - it isn't actually the resource itself (or the contents of the resource in the case of an EditText for example).

**This is the correct way to change information between 2 activity, of corse be careful to activity lifecycle. This code best practice!**
First activity
public class MainActivity extends Activity {
private static final String Tag = "ACTIVITY";
private static final String CONTATORE = "contatore";
TextView et;
Button btn,btnLancia;
int counter = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et = (TextView) findViewById(R.id.et);
btn = (Button) findViewById(R.id.btn);
btnLancia = (Button) findViewById(R.id.btnLancia);
if(savedInstanceState != null){
counter = savedInstanceState.getInt(CONTATORE);
}
btnLancia.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
lanciaActivity();
}
});
et.setText("" + counter);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
++counter;
et.setText("" + counter);
}
});
Log.d(Tag, "OnCreate");
}
protected void lanciaActivity() {
Intent intent = new Intent(this,Activity2.class);
Bundle bundle = new Bundle();
bundle.putInt(Activity2.VALUE, counter);
intent.putExtras(bundle);
startActivity(intent);
}
#Override
protected void onDestroy() {
super.onDestroy();
Log.d(Tag, "OnDestroy");
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.d(Tag, "OnPause");
}
#Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.d(Tag, "OnRestart");
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
Log.d(Tag, "onRestoreInstanceState");
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.d(Tag, "OnResume");
}
#Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
Log.d(Tag, "OnSaveIstantState");
outState.putInt(CONTATORE, counter);
}
#Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.d(Tag, "OnStart");
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.d(Tag, "OnStop");
}
}
SECONd ACTIVITY
public class Activity2 extends Activity {
private static final String Tag = "ACTIVITY2";
public static final String VALUE = "value";
private static final String VALOREATT = "val";
TextView contatore;
Button button;
int contatoreq;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity2);
Log.d(Tag, "OnCreate");
contatore = (TextView) findViewById(R.id.textView1);
button = (Button) findViewById(R.id.btnDoppio);
if(savedInstanceState!=null){
contatoreq = savedInstanceState.getInt(VALOREATT);
}
else {
Intent intetn = getIntent();
Bundle bundle = intetn.getExtras();
if(bundle!=null)
contatoreq = bundle.getInt(VALUE);
}
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
contatoreq = contatoreq*2;
contatore.setText("" + contatoreq);
}
});
contatore.setText("" + contatoreq);
}
#Override
protected void onDestroy() {
super.onDestroy();
Log.d(Tag, "OnDestroy");
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.d(Tag, "OnPause");
}
#Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.d(Tag, "OnRestart");
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
Log.d(Tag, "onRestoreInstanceState");
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.d(Tag, "OnResume");
}
#Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
Log.d(Tag, "OnSaveIstantState");
outState.putInt(VALOREATT, contatoreq);
}
#Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.d(Tag, "OnStart");
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.d(Tag, "OnStop");
}
}

I see two problems in your code.
First you are setting userInput to R.string.userInput which is kind of strange imo. You should set userInput to the text from the TextField:
String userInput = text.getText().toString();
The second problem I notice is that you start the second intent twice. Once for result and once without:
startActivityForResult(i, 0);
startActivity();
Try to remove the startActivityForResult if you do not want to work with the result from the last activity. You probably misunderstood was startActivityForResult(i, 0) does.
You basically call startActivityForResult() if you want to get the result back from the activity. For example you are in your MainActivity and want to display a photo in there. Now you can start the camera intent with startActivityForResult() and after the photo is taken you can process this in your MainActivity.
If you just want to pass the value to the next activity a simple startActivity() is enough. Here is the link to the docs if you want to read more about this topic:
startActivityForResult() - Documentation

Android - ListView disappears after setContentView()?

I have a ListView in one my activity_main.xml file, the problem is, when I click on a Item in that ListView (activity_main.xml), it calls setContentView() and loads another XML file called activity_settings.xml.
The problem is, when I click the back button in activity_settings.xml (Button to call setContentView() again and go back to activity_main.xml) The ListView from activity_main.xml disappears.
I have tried about dozen ways of fixing it, but nothing seems to work.
Here is my MainActivity.java (It is pretty big):
package com.NautGames.xectav2.app;
import {...}
public class MainActivity extends ASR {
private ToggleButton homeOnOff;
HomeHoldDown hhd = new HomeHoldDown();
int keyCode;
KeyEvent event;
Context context;
private static final String LOGTAG = "Xecta";
private static final String BOTID = "e38006d97e34053e";
private TTS myTts;
private ImageButton speakButton;
private Bot bot;
Button backB1;
Button backB2;
Button backB3;
boolean mBound = false;
SimpleAdapter simpleAdpt;
BoundService myService = new BoundService();
boolean isBound = false;
EditText name, email, mMessage, subject;
String key;
String Name;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, BoundService.class);
bindService(intent, myConnection, Context.BIND_AUTO_CREATE);
//homeOnOff = (ToggleButton) findViewById(R.id.toggleButton);
name = (EditText) findViewById(R.id.etName);
email = (EditText) findViewById(R.id.etEmail);
mMessage = (EditText) findViewById(R.id.etAdd);
subject = (EditText) findViewById(R.id.txtSubject);
Button startBtn = (Button) findViewById(R.id.send);
backB1 = (Button)findViewById(R.id.button1);
backB2 = (Button)findViewById(R.id.button2);
backB3 = (Button)findViewById(R.id.button3);
//Initialize GUI elements
setSpeakButton();
//Initialize the speech recognizer
createRecognizer(getApplicationContext());
//Initialize text to speech
myTts = TTS.getInstance(this);
//Create bot
bot = new Bot(this, BOTID, myTts, "assistant");
initList();
// We get the ListView component from the layout
ListView lv = (ListView) findViewById(R.id.listView);
// This is a simple adapter that accepts as parameter
// Context
// Data list
// The row layout that is used during the row creation
// The keys used to retrieve the data
// The View id used to show the data. The key number and the view id must match
simpleAdpt = new SimpleAdapter(this, planetsList, android.R.layout.simple_list_item_1, new String[] {"page"}, new int[] {android.R.id.text1});
lv.setAdapter(simpleAdpt);
// React to user clicks on item
lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<?> parentAdapter, View view, int position,
long id)
{
// We know the View is a TextView so we can cast it
TextView clickedView = (TextView) view;
//Toast.makeText(MainActivity.this, "Item with id ["+id+"] - Position ["+position+"] - Planet ["+clickedView.getText()+"]", Toast.LENGTH_SHORT).show();
if(id == 0)
{
setContentView(R.layout.activity_settings);
}
if(id == 1)
{
setContentView(R.layout.activity_about);
}
if(id == 2)
{
setContentView(R.layout.activity_feedback);
}
}
});
}
public void onClickSend(View v) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"name#email.com"});
i.putExtra(Intent.EXTRA_SUBJECT, subject.getText().toString());
i.putExtra(Intent.EXTRA_TEXT , mMessage.getText().toString());
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(MainActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
}
//from here
private ServiceConnection myConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className,
IBinder service) {
BoundService.MyLocalBinder binder = (BoundService.MyLocalBinder) service;
myService = binder.getService();
isBound = true;
}
public void onServiceDisconnected(ComponentName arg0) {
isBound = false;
}
};
//to HERE
public void showTime(View view)
{
myService.getCurrentTime();
}
/************************************************************************
* WHEN THE USER TURNS THE HOME LISTENING ON AND OFF
* IT WILL START SERVICE AND STOP SERVICE
*************************************************************************/
/*public void onToggleClicked(View view) {
boolean on = ((ToggleButton) view).isChecked();
if (on) {
//Toast.makeText(MainActivity.this, "Activate Xecta with Home ON", Toast.LENGTH_LONG).show();
//startService(new Intent(getBaseContext(), Service1.class));
} else {
//Toast.makeText(MainActivity.this, "Activate Xecta with Home OFF", Toast.LENGTH_LONG).show();
//stopService(new Intent(getBaseContext(), LocalService.class));
}
}*/
#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;
}
/*public void onClickService(View view)
{
if(isApplicationSentToBackground(context))
{
hhd.onKeyLongPress(keyCode, event);
}
}*/
/**************************************************************************
* WHEN THE USER HOLDS DOWN THE HOME BUTTON
*************************************************************************/
#Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
Toast.makeText(MainActivity.this, "Key pressed long!", Toast.LENGTH_LONG).show();
return true;
}
return super.onKeyLongPress(keyCode, event);
}
public void onClickBack(View view)
{
setContentView(R.layout.activity_main);
}
// The data to show
List<Map<String, String>> planetsList = new ArrayList<Map<String,String>>();
private void initList() {
// We populate the planets
planetsList.add(newList("page", "Settings"));
planetsList.add(newList("page", "About"));
planetsList.add(newList("page", "FeedBack"));
}
private HashMap<String, String> newList(String key, String name) {
HashMap<String, String> planet = new HashMap<String, String>();
planet.put(key, name);
return planet;
}
public void onClick(View view)
{
speakButton = (ImageButton) findViewById(R.id.speech_btn);
try {
listen(RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH, 10);
} catch (Exception e) {
Toast.makeText(getApplicationContext(),"ASR could not be started: invalid params", Toast.LENGTH_SHORT).show();
Log.e(LOGTAG, e.getMessage());
}
}
private void setSpeakButton() {
speakButton = (ImageButton) findViewById(R.id.speech_btn);
speakButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
listen(RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH, 10);
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "ASR could not be started: invalid params", Toast.LENGTH_SHORT).show();
Log.e(LOGTAG, e.getMessage());
}
}
});
}
/**
* Provides feedback to the user when the ASR encounters an error
*/
public void processAsrError(int errorCode) {
String errorMessage;
switch (errorCode)
{
case SpeechRecognizer.ERROR_AUDIO:
errorMessage = "Audio recording error";
break;
case SpeechRecognizer.ERROR_CLIENT:
errorMessage = "Client side error";
break;
case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS:
errorMessage = "Insufficient permissions" ;
break;
case SpeechRecognizer.ERROR_NETWORK:
errorMessage = "Network related error" ;
break;
case SpeechRecognizer.ERROR_NETWORK_TIMEOUT:
errorMessage = "Network operation timeout";
break;
case SpeechRecognizer.ERROR_RECOGNIZER_BUSY:
errorMessage = "RecognitionServiceBusy" ;
break;
case SpeechRecognizer.ERROR_SERVER:
errorMessage = "Server sends error status";
break;
case SpeechRecognizer.ERROR_NO_MATCH:
errorMessage = "No matching message" ;
break;
case SpeechRecognizer.ERROR_SPEECH_TIMEOUT:
errorMessage = "Input not audible";
break;
default:
errorMessage = "ASR error";
break;
}
try {
myTts.speak(errorMessage,"EN");
} catch (Exception e) {
Log.e(LOGTAG, "English not available for TTS, default language used instead");
}
//If there is an error, shows feedback to the user and writes it in the log
Log.e(LOGTAG, "Error: "+ errorMessage);
Toast.makeText(this, errorMessage, Toast.LENGTH_LONG).show();
}
public void processAsrReadyForSpeech() {
Toast.makeText(this, "I'm listening", Toast.LENGTH_LONG).show();
}
public void processAsrResults(ArrayList<String> nBestList, float[] confidences) {
String bestResult = nBestList.get(0);
Log.d(LOGTAG, "Speech input: " + bestResult);
// insert %20 for spaces in query
bestResult = bestResult.replaceAll(" ", "%20");
bot.initiateQuery(bestResult);
//Toast.makeText(MainActivity.this, "", Toast.LENGTH_LONG).show();
}
#Override
public void onDestroy() {
myTts.shutdown();
super.onDestroy();
}
#Override
public void onBackPressed() {
super.onBackPressed();
setContentView(R.layout.activity_main);
newList(key, Name);
initList();
}
#Override
public void onStop()
{
super.onStop();
Toast.makeText(MainActivity.this, "Bye bye!", Toast.LENGTH_SHORT).show();
onKeyLongPress(keyCode, event);
}
#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);
}
}
onClickBack is the button to go back to activity_main.xml, I am also initialising the ListView in onCreate().
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/onericblur"
android:orientation="vertical"
android:paddingBottom="5dp"
android:onClick="onClick"
android:weightSum="1">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:orientation="vertical" >
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#000000"
android:paddingBottom="10dip"
android:paddingTop="10dip"
android:text="#string/title"
android:textColor="#FFFFFF"
android:textSize="18sp" />
</LinearLayout>
<ViewAnimator
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/viewAnimator"
android:layout_gravity="right" />
<ImageButton
android:id="#+id/speech_btn"
android:background="#null"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/xectaicon"
android:onClick="onClick"
android:layout_marginTop="32dp"
android:layout_gravity="center_horizontal|top" />
<ListView
android:layout_width="match_parent"
android:layout_height="127dp"
android:id="#+id/listView"
android:layout_weight="1.22"
android:background="#android:drawable/screen_background_light_transparent" />
</LinearLayout>
And activity_settings...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1"
android:background="#drawable/onericblur">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/listSeparatorTextViewStyle"
android:text="Settings"
android:id="#+id/textView"
android:layout_gravity="center_horizontal"
android:textSize="30dp"
android:textColor="#android:color/black" />
<TextView
android:layout_width="291dp"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Xecta is currently in Beta being tested, you can request settings by going to the feedback section. Sorry!"
android:id="#+id/textView2"
android:layout_weight="0.04"
android:layout_gravity="center_horizontal"
android:textSize="20dp"
android:gravity="center|top" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Back to home"
android:id="#+id/button3"
android:onClick="onClickBack"
android:layout_gravity="center_horizontal" />
</LinearLayout>
What could be causing the problem?!?!?
Thanks.

As suggested by Ram Kiran, it's better to have different activities for Settings / Home.
The problem with the code you have posted is that you are not populating the list with the contents when you press back. I believe it should be fixed with the following code,
public void onClickBack(View view)
{
setContentView(R.layout.activity_main);
ListView lv = (ListView) findViewById(R.id.listView);
lv.setAdapter(simpleAdpt);
}
Basically when you call setContentView(layoutId) new view will be inflated from the layout and you need to do all the UI lookup, initialization again.

I dont think loading xml files repeatedly in same activity is a good one. Try to use two activities instead of loading different xml files in same activity.
MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv = (ListView) findviewById(R.id.list);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<?> parentAdapter, View view, int position,
long id)
{
Intent n = new Intent(getApplicationContext(),SettingsActivity.class);
startActivity(n);
}
}
SettingsActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Buttoon btn = (Button) findviewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent n = new Intent(getApplicationContext(),MainActivity.class);
startActivity(n);
}
});

Try out as below:
#Override
public void onResume()
{
super.onResume();
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, BoundService.class);
bindService(intent, myConnection, Context.BIND_AUTO_CREATE);
//homeOnOff = (ToggleButton) findViewById(R.id.toggleButton);
name = (EditText) findViewById(R.id.etName);
email = (EditText) findViewById(R.id.etEmail);
mMessage = (EditText) findViewById(R.id.etAdd);
subject = (EditText) findViewById(R.id.txtSubject);
Button startBtn = (Button) findViewById(R.id.send);
backB1 = (Button)findViewById(R.id.button1);
backB2 = (Button)findViewById(R.id.button2);
backB3 = (Button)findViewById(R.id.button3);
//Initialize GUI elements
setSpeakButton();
//Initialize the speech recognizer
createRecognizer(getApplicationContext());
//Initialize text to speech
myTts = TTS.getInstance(this);
//Create bot
bot = new Bot(this, BOTID, myTts, "assistant");
initList();
// We get the ListView component from the layout
ListView lv = (ListView) findViewById(R.id.listView);
// This is a simple adapter that accepts as parameter
// Context
// Data list
// The row layout that is used during the row creation
// The keys used to retrieve the data
// The View id used to show the data. The key number and the view id must match
simpleAdpt = new SimpleAdapter(this, planetsList, android.R.layout.simple_list_item_1, new String[] {"page"}, new int[] {android.R.id.text1});
lv.setAdapter(simpleAdpt);
}