Develop Reference

Trouble with Spinner: Attempted to finish an input event but the input event receiver has already been disposed

As the title says, I get this error while interacting with a Spinner. I've noticed that there are many post about this argument, but every one is different from each other (answers too). Unfortunately, I didn't find a solution, so I'm asking here.
Here is a screenshot of the Spinner:
As you can see, the first Spinner is ok, but the second has two problems:
First one, it doesn't show values
Second one, when I tap the spinner, nothing happen. If I tap again the spinner, I get the error "Attempted to finish an input event but the input event receiver has already been disposed."
Maybe the two things are connected somehow...
Here is the code:
public class Settings extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
Integer[] radiusArray = new Integer[]{500,700,1000,1500,2000,2500,3000,4000,5000};
Integer[] geofenceRadius = new Integer[]{100,200,300,400,500};
try {
final Spinner spinnerRA = (Spinner) findViewById(R.id.search_radius);
final Spinner spinnerGR = (Spinner) findViewById(R.id.geofence_radius);
ArrayAdapter<Integer> adapterRA = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, radiusArray);
spinnerRA.setAdapter(adapterRA);
ArrayAdapter<Integer> adapterGR = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, geofenceRadius);
spinnerRA.setAdapter(adapterGR);
//Getting from preference files, saved settings, if any
//1000 and 100 are default settings
final SharedPreferences sharedPref = getSharedPreferences("Settings",Context.MODE_PRIVATE);
String temp = getResources().getString(R.string.search_radius);
int savedRadius = sharedPref.getInt(temp, 1000);
temp = getResources().getString(R.string.geofence_radius);
int savedGeofence = sharedPref.getInt(temp, 100);
//Show selected value for spinner, or default value
int i;
for(i=0; i<radiusArray.length; i++){
if(radiusArray[i].equals(savedRadius)){
break;
}
}
spinnerRA.setSelection(i);
for(i=0; i<geofenceRadius.length; i++){
if(geofenceRadius[i].equals(savedGeofence)){
break;
}
}
spinnerGR.setSelection(i);
Button Save = (Button) findViewById(R.id.save_settings_button);
Save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Integer searchRadius = (Integer)spinnerRA.getSelectedItem();
Integer geofenceRadius = (Integer)spinnerGR.getSelectedItem();
//Saving new value of search_radius
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.search_radius),searchRadius);
editor.putInt(getString(R.string.geofence_radius),geofenceRadius);
editor.putBoolean(getString(R.string.initialized),true);
editor.commit();
CharSequence text = "Changes saved succesfully!";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(getApplicationContext(), text, duration);
toast.show();
}
});
}catch (Exception e){
e.printStackTrace();
}
}
}
And here is the xml file:
<?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">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Settings"
android:textSize="14pt"
android:layout_marginTop="8pt"
android:gravity="center"/>
<View android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="5pt"
android:id="#+id/second_gray_line"
android:background="#android:color/darker_gray"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="10pt">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Initial search radius (in meters):"
android:textColor="#FF8500"
android:layout_marginLeft="10pt"
android:layout_marginTop="15pt"
android:textSize="11pt"/>
<Spinner
android:layout_width="60pt"
android:layout_height="wrap_content"
android:id="#+id/search_radius"
android:layout_marginTop="5pt"
android:layout_marginLeft="5pt">
</Spinner>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="10pt">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Location radius (in meters):"
android:textColor="#FF8500"
android:layout_marginLeft="10pt"
android:layout_marginTop="15pt"
android:textSize="11pt"/>
<Spinner
android:layout_width="60pt"
android:layout_height="wrap_content"
android:id="#+id/geofence_radius"
android:layout_marginTop="5pt"
android:layout_marginLeft="5pt">
</Spinner>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/save_settings_button"
android:text="Save Settings"
android:textSize="10pt"
android:layout_gravity="center"
android:layout_marginTop="50pt"/>
</LinearLayout>
I think it's a really stupid error, but I can't figure out what causes it. Could you help me? Thank you!

I solved and, as I said, the error was really stupid... I made a mistake here, in the second adapter:
ArrayAdapter<Integer> adapterGR = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, geofenceRadius);
spinnerRA.setAdapter(adapterGR);
This must be changed in:
ArrayAdapter<Integer> adapterGR = new ArrayAdapter<Integer>(this,android.R.layout.simple_spinner_item, geofenceRadius);
spinnerGR.setAdapter(adapterGR);
It was just an oversight. I was setting the second adapter using spinnerRA instead of spinnerGR. Now it works!

Android Login/Registration using sharedPreference

I'm trying to make a Login/Registration activity by using sharedpreference. The app will only hold one login/password information.
So on original start up the app will check if the user has already made an account. This will be kept under a boolean called Registered. If that is true then it will enable the login button and disable the register button. If it is false then it will enable the register button and disable the login button.
When the types in his wanted username and password they can then hit the register button which will set the username and password into strings while changing the boolean to true and then put them in the sharedpreferences. Then the activity will refresh itself.
Currently i cannot get the buttons to change. I think i may be doing sharedpreferences wrong as this is my first time working with them. (Im new to android development.)
Here is my current code.
I have updated the code to include editor.apply()
I have added a few bits and pieces, mainly getting the value at start.
FINAL UPDATE: I have fixed the problem. It seemed to lie within the .setenabled i was using for the buttons. Once i switched them to .setvisibility, they switched perfectly. Thank you all for your help!
public class MainActivity extends AppCompatActivity {
EditText Username_input, Password_input;
String Username, Password;
//if false then no, if true then yes
boolean Registered;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
Registered = sharedPref.getBoolean("Registered", false);
Button RegisterButton = (Button) findViewById(R.id.Register_btn);
Button Loginbutton = (Button) findViewById(R.id.Login_btn);
// If the user is registered.
if (Registered == false) {
Loginbutton.setEnabled(false);
RegisterButton.setEnabled(true);
// If the user is registered already.
} else {
Loginbutton.setEnabled(true);
RegisterButton.setEnabled(false);
}
RegisterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Username_input = (EditText) findViewById(R.id.Username_input);
Password_input = (EditText) findViewById(R.id.Password_input);
Username = Username_input.getText().toString();
Password = Password_input.getText().toString();
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("Registered", true);
editor.putString("Username", Username);
editor.putString("Password", Password);
editor.apply();
finish();
startActivity(getIntent());
}
});
}
}
XML Code
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="#string/Username_txtview"
android:id="#+id/Username_txtview"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="32dp"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:editable="false" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/Username_input"
android:enabled="true"
android:layout_marginLeft="32dp"
android:layout_marginRight="32dp"
android:layout_below="#+id/Username_txtview"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="#string/Password_txtview"
android:id="#+id/Password_txtview"
android:layout_below="#+id/Username_input"
android:layout_alignLeft="#+id/Username_input"
android:layout_alignStart="#+id/Username_input" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/Password_input"
android:enabled="true"
android:layout_marginLeft="32dp"
android:layout_marginRight="32dp"
android:layout_below="#+id/Password_txtview"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:text="#string/Login_btn"
android:id="#+id/Login_btn"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/Register_btn"
android:id="#+id/Register_btn"
android:layout_below="#+id/Login_btn"
android:layout_marginLeft="80dp"
android:layout_marginRight="80dp"
android:layout_marginTop="26dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
/>
</RelativeLayout>

final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
Registered = sharedPref.getBoolean("Registered", false);
if (!Registered) {
Loginbutton.setVisibility(View.GONE);
RegisterButton.setVisibility(View.VISIBLE);
// If the user is registered already.
} else{
Loginbutton.setVisibility(View.VISIBLE);
RegisterButton.setVisibility(View.GONE);
}
RegisterButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Username_input = (EditText) findViewById(R.id.Username_input);
Password_input = (EditText) findViewById(R.id.Password_input);
Username = Username_input.getText().toString();
Password = Password_input.getText().toString();
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("Registered", true);
editor.putString("Username", Username);
editor.putString("Password", Password);
editor.apply();
finish();
startActivity(getIntent());
}
});

add editor.commit() after you put the value into preferences.
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean("Registered", Registered);
editor.putString("Username", Username);
editor.putString("Password", Password);
editor.commit();

You are making two mistakes :
not fetching the registered value from shared preferences before checking it's value initially.
not doing editor.apply () or editor.commit() after putting new values.

try this (no need of taking shared pref as final)
SharedPreferences sharedPref = getContext().getSharedPreferences("hello", getContext().MODE_PRIVATE);
Boolean register = sharedPref.getBoolean("key",true);
and inside register.onClick
SharedPreferences sharedPref = getContext().getSharedPreferences("hello", getContext().MODE_PRIVATE);
SharedPreferences.Editor editor= sharedPref.edit();
//your rest of the code to put string values into shared pref here.
editor.putBoolean("key",false);
editor.apply();

saving toggle button and textView state

I'm new on android. I want to change the color of a text when a toggle button is checked and then save the state of both toggle button and text color even when the app is killed. can somebody give me some tips of how to do that. thanks.

here is simple example of toggle button and text view with Preferences(for save state).
create layout file below way
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dip"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ToggleButton
android:id="#+id/toggleButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New ToggleButton" />
</LinearLayout>
in your activity
public class MainActivity extends AppCompatActivity {
TextView textItem;
SharedPreferences sPref;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
// init Preferences
sPref = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
// init view
textItem = (TextView) findViewById(R.id.textView);
ToggleButton syncSwitch = (ToggleButton) findViewById(R.id.toggleButton1);
// toggle button event
syncSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set text color method
setTextColor(isChecked);
// save Toggle button state in Preference
SharedPreferences.Editor ed = sPref.edit();
ed.putBoolean("ToggleButton_CHECK", isChecked);
ed.commit();
}
});
// set default color if TextView called when activity started only for first time
boolean saveState = sPref.getBoolean("ToggleButton_CHECK", false);
setTextColor(saveState);
syncSwitch.setChecked(saveState);
}
public void setTextColor(boolean isChecked) {
if (isChecked) {
// button is on
textItem.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.agro_purple));
} else {
// button is off
textItem.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.colorAccent));
}
}
}
Hope it help!

Android: Change background colour of specific activity using SharedPreferences

I am trying to change the background colour of a activity where the user can change the colour using 3 radio buttons in an android app. I am doing this using sharedPreferences.
So I have the activity page where the colour is chosen with the radio group and the code to use sharedPrefernces looks like this (i know the switch statement works aswell as I have a toast message apperring when the colour is supposed to change):
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_preferences);
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radiogroup);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
SharedPreferences prefs = getSharedPreferences("bgColour", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
String colourSelected = "";
switch (checkedId) {
case R.id.radioButton1 :
colourSelected = "YELLOW";
editor.putString("colour", colourSelected);
editor.commit();
break;
case R.id.radioButton2 :
colourSelected = "YELLOW";
editor.putString("colour", colourSelected);
editor.commit();
break;
case R.id.radioButton3 :
colourSelected = "BLUE";
editor.putString("colour", colourSelected);
editor.commit();
break;
}
}
});
}
The XML looks like this
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.practical3_10327751_donnacha_holmes.Preferences" >
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/radiogroup"
>
<RadioButton
android:id="#+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Green" />
<RadioButton
android:id="#+id/radioButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Yellow" />
<RadioButton
android:id="#+id/radioButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Blue" />
</RadioGroup>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Back" />
Then there is the activity that changes the background colour, which looks like this when trying to change the colour:
public class Activity2 extends ActionBarActivity {
RelativeLayout rl;
String colour;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity2);
SharedPreferences prefs = getSharedPreferences("bgColour", MODE_PRIVATE);
colour = prefs.getString("Colour", "WHITE");
rl = (RelativeLayout)findViewById(R.id.RelativeLayout);
if(colour=="GREEN"){
rl.setBackgroundColor(Color.GREEN);
}
else if(colour=="YELLOW"){
rl.setBackgroundColor(Color.YELLOW);
}
else if(colour=="BLUE"){
rl.setBackgroundColor(Color.BLUE);
}
else{
rl.setBackgroundColor(Color.RED);
}
I know that the background colour is being changed because it is being set to red every time I go to this page.
Thanks for any help!

The == operator checks to see if the two strings are exactly the same object.
The .equals() method will check if the two strings have the same value.
Therefore to compare Strings use .equals(),i.e. rewrite your comparison as
if(colour.equals("GREEN")){
rl.setBackgroundColor(Color.GREEN);
}
else if(colour.equals("YELLOW")){
rl.setBackgroundColor(Color.YELLOW);
}
else if(colour.equals("BLUE")){
rl.setBackgroundColor(Color.BLUE);
}
else{
rl.setBackgroundColor(Color.RED);
}
and you are saving value as colour and try to retrieving as Colour,so change
colour = prefs.getString("Colour", "WHITE");
to
colour = prefs.getString("colour", "WHITE");

Custom Radio button

i'm working on custom radio button. it works fine(as it is defined in options.xml) but when i switch from options.xml to main.xml, it turns default, means it is no more highlighted. it should work like until i press it it should not turn to default.. here is radiobutton_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/radio_down" android:state_checked="true"/>
<item android:drawable="#drawable/radio" android:state_checked="false"/>
</selector>
i'm using these in options.xml to call radio button settings.
<RadioGroup
android:id="#+id/sound"
android:layout_width="150dp"
android:layout_height="100dp"
android:layout_gravity="right"
android:layout_marginRight="0dp"
android:layout_marginTop="50dp"
android:orientation="vertical"
android:padding="0dp" >
<RadioButton
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:button="#drawable/radiobutton_selector"
android:id="#+id/on"
/>
<RadioButton
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:button="#drawable/radiobutton_selector"
android:id="#+id/off"
/>
</RadioGroup>
Please help me to figure out the issue. Thanks in advance !!!!!

You can do like this for your RadioGroup.
you need to save which radio Button you have selected ,for that you can use one variable like below.
int check_radio=-1;
public static final int RADIO_BUTTON_ON=1;
public static final int RADIO_BUTTON_OFF=2;
mRadioGroup
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup group,
int checkedId) {
switch(checkedId){
case R.id.on:
//Radio Button on is True
check_radio=RADIO_BUTTON_ON;
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("RadioButton", RADIO_BUTTON_ON);
// Commit the edits!
editor.commit();
break;
case R.id.off:
//Radio Button off is True
check_radio=RADIO_BUTTON_OFF;
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("RadioButton", RADIO_BUTTON_OFF);
// Commit the edits!
editor.commit();
break;
}
});
Now whey your Activity 's Resume you can check one condition like below.
Get Value from SharedPrefrence Like below code;
//If you have save your value in SharedPrefrence it will return your stored int value.
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
check_radio = settings.getInt("RadioButton", -1);
if(check_radio==RADIO_BUTTON_ON){
mRadioOn.setChecked(true);
}else if(check_radio==RADIO_BUTTON_OFF){
mRadioOff.setChecked(true);
}
you can use SharedPreferences by below step
public static final String PREFS_NAME = "MyPrefsFile";
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);