Develop Reference

setBackgroundColor is crashing the android application

I recently made a small app that should change the background color & text of the application when a certain amount of money is generated (here 100000). However, whenever I go past 10000, the application crashes. I am not sure why and can not get around it. I saw that this problem is with background color only because it is otherwise displaying text correctly.
Here is the XML for activity_main
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/Trial"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#EC5353"
tools:context=".MainActivity">
<TextView
android:id="#+id/Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="92dp"
android:gravity="center"
android:text="#string/Title"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/money"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="72dp"
android:text="#string/moneyPresent"
android:textSize="22sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/Title" />
<Button
android:id="#+id/moneyGenerator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="72dp"
android:background="#FFFFFF"
android:backgroundTint="#732424"
android:backgroundTintMode="multiply"
android:text="#string/generateMoneyButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/money" />
<TextView
android:id="#+id/richTag"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:text="#string/grind_boi"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/moneyGenerator" />
</androidx.constraintlayout.widget.ConstraintLayout>
Here is my Java Code (Omitted the packages as it would take a lot of space. Do tell me if anyone wants to read it.)
public class MainActivity extends AppCompatActivity {
private Button makeMoney;
private int totalMoney=0;
private TextView moneyText;
private TextView richAlert;
private ConstraintLayout background;
NumberFormat currency=NumberFormat.getCurrencyInstance(new Locale("en","in"));
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
makeMoney = findViewById(R.id.moneyGenerator);
moneyText=findViewById(R.id.money);
richAlert=findViewById(R.id.richTag);
makeMoney.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
totalMoney+=1000;
moneyText.setText(currency.format(totalMoney));
Log.d("MoneyTag", "Money Made: "+totalMoney);
Toast.makeText(getApplicationContext(),"Total Money= \u20B9"+totalMoney,Toast.LENGTH_LONG)
.show();
if(totalMoney>=10000) {
richAlert.setText("Welcome to moneyland bro 😁");
background.setBackgroundColor(16776960);
}
}
});
}
}

makeMoney = findViewById(R.id.moneyGenerator);
moneyText=findViewById(R.id.money);
richAlert=findViewById(R.id.richTag);
You're finding all the views, except background(ConstraintLayout), that's why it is throwing NullPointerException (Most likely, because you haven't attached logs).
You need to find the layout first
background = findViewById(R.id.Trial);
in onCreate.

you haven't defined "background" view in the above.
to use .setBackgroundColor you need to use it with some view
try making object of layout view then change the color of that layout
mConstraintLayout =
(ConstraintLayout)findViewById(R.id.Trial);
makeMoney = findViewById(R.id.moneyGenerator);
moneyText=findViewById(R.id.money);
richAlert=findViewById(R.id.richTag);
if(totalMoney>=10000) {
richAlert.setText("Welcome to moneyland bro 😁");
mConstraintLayout.setBackgroundColor(ContextCompat.getColor(this, R.color.yellow));

background = findViewById(R.id.Trial);
just find layout and null pointer excpetion will removed

pushed off by the recycler view button and notifyItemRemoved

So my problem is: when I add many items to the Recycler View, the button below which has to add more items, dissapear because he is pusshed off from the screen by the recycler. before add and after. There is no button :/
here is the xml code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
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=".AddActivityFormEvent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="date"
android:ems="14"
android:id="#+id/dateField"
android:singleLine="true"
android:hint="#string/data"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:drawableLeft="#drawable/ic_today"
android:onClick="showDatePickerDialog"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="time"
android:singleLine="true"
android:hint="#string/czas"
android:id="#+id/timeField"
android:layout_alignTop="#+id/dateField"
android:layout_toRightOf="#+id/dateField"
android:layout_toEndOf="#+id/dateField"
android:drawableLeft="#drawable/ic_time"
android:onClick="showTimePickerDialog"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/relativeLayout"
android:layout_below="#+id/dateField">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linearLayout"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/activityRecyclerView"
android:elevation="15dp"
android:layout_below="#+id/relativeLayout"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/addActivityEvent"
android:text="Dodaj aktywność"
android:layout_gravity="bottom"
android:layout_below="#+id/linearLayout"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/testButton"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
By the way, how to get actual position of the view holder? I ask because when I delete item first time, it return correct index, but each next time it is one more, for example when I delete first item(index 0) it returns 1
here is an adapter with view holder:
public class ActivityFormEventAdapter extends RecyclerView.Adapter<ActivityFormEventAdapter.ActivityFormEventViewHolder>{
ArrayList<ActivityFormEvent> adapter_list = new ArrayList<>();
AddActivityFormEvent addActivityFormEvent;
private static Button button;
Context ctx;
public ActivityFormEventAdapter(ArrayList<ActivityFormEvent> adapter_list,Context ctx){
this.adapter_list=adapter_list;
this.ctx=ctx;
addActivityFormEvent= (AddActivityFormEvent) ctx;
button= (Button) addActivityFormEvent.findViewById(R.id.testButton);
}
public ActivityFormEventViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_form_event_card,parent,false);
ActivityFormEventViewHolder activityFormEventViewHolder = new ActivityFormEventViewHolder(view,addActivityFormEvent);
return activityFormEventViewHolder;
}
#Override
public void onBindViewHolder(ActivityFormEventViewHolder holder, final int position) {
holder.activityName.setText(adapter_list.get(position).getActivityForm().getName());
holder.duration.setText(adapter_list.get(position).getTime());
holder.burnedKcalPerHour.setText(adapter_list.get(position).getActivityForm().getBurnedKcalPerHour());
holder.burnedKcal.setText(adapter_list.get(position).getBuriedKcal());
holder.deleteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
adapter_list.remove(position);
notifyItemRemoved(position);
}
});
}
#Override
public int getItemCount() {
return adapter_list.size();
}
public static class ActivityFormEventViewHolder extends RecyclerView.ViewHolder{
AddActivityFormEvent addActivityFormEvent;
EditText activityName;
EditText duration;
EditText burnedKcalPerHour;
EditText burnedKcal;
ImageButton deleteButton;
public ActivityFormEventViewHolder(View itemView,AddActivityFormEvent addActivityFormEvent) {
super(itemView);
activityName = (EditText) itemView.findViewById(R.id.activityName);
duration = (EditText) itemView.findViewById(R.id.duration);
burnedKcalPerHour = (EditText) itemView.findViewById(R.id.burnedKcalPerHour);
burnedKcal = (EditText) itemView.findViewById(R.id.kcalExercise);
deleteButton = (ImageButton) itemView.findViewById(R.id.deleteButton);
this.addActivityFormEvent = addActivityFormEvent;
}
}
}

Okay try this, here bottom view must have minimum height = height of Buttom that attached and it's height must be programmatically set to height of all view - recyclerview content height. Try to change height of bottom view to see the difference in preview.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/relativeLayout"
android:layout_below="#+id/dateField">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:id="#+id/linearLayout"
android:layout_above="#+id/bottom_space_holder"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/activityRecyclerView"
android:elevation="15dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/addActivityEvent"
android:text="Dodaj aktywność"
android:layout_alignParentLeft="true"
android:layout_below="#+id/linearLayout"
android:layout_alignParentStart="true" />
<View
android:layout_width="match_parent"
android:layout_height="48dp"
android:id="#+id/bottom_space_holder"
android:text="Dodaj aktywność"
android:layout_alignParentBottom="true"/>
</RelativeLayout>

This happens because you place the Button below the RecyclerView using layout_below and the RecyclerView's height is set to wrap_content. This means that once the RecyclerView's content exceeds the screens height, the Button will fall off the screen, because it is placed below the RecyclerView.
To fix this issue, you should align your Button to the parent's bottom (using layout_alignParentBottom) and layout your RecyclerView above the button (using layout_above and layout_alignParentTop), this way the Button will always be placed and visible at the bottom of your screen.

Programmatically adding a TextView onto an existing XML file

My main screen displays info from user input.
Now everything on this screen is added using XML apart from "Kool" TextView on the top left corner. Now I want a way to get info from a user and add it underneath the first row of information.
I've sorted out the screen that gets user input the problem is actually getting the layout perfect. Now I added "Kool" TextView programmatically but the layout is wrong.
How can I make it so it so the "Kool" TextView is underneath the date "20/08/15". Every time I use the setHeight method it makes the TextView invisible.
Code:
public class AnalysisPage extends Activity {
Button savebutton,cancelbutton;
EditText dateinput,weightinput,repsinput;
int dd,mm,yy;
private TextView texty = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dumbbellpress);
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_activity_actions,menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.addinfo:
Dialog dialog = new Dialog(AnalysisPage.this);
dialog.setTitle(" Enter your STATS brah");
dialog.setContentView(R.layout.datainput);
dateinput = (EditText)dialog.findViewById(R.id.editDate);
final Calendar c = Calendar.getInstance();
dd = c.get(Calendar.DAY_OF_MONTH);
mm = c.get(Calendar.MONTH);
yy = c.get(Calendar.YEAR);
dateinput.setText(new StringBuilder().append(dd).append("/").append(mm+1).append("/").append(yy));
dialog.show();
weightinput = (EditText)dialog.findViewById(R.id.editWeight);
repsinput = (EditText)dialog.findViewById(R.id.editReps);
savebutton = (Button)dialog.findViewById(R.id.btnSave);
cancelbutton = (Button)dialog.findViewById(R.id.btnCancel);
savebutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
RelativeLayout views = (RelativeLayout)findViewById(R.id.xxx);
texty = new TextView(AnalysisPage.this);
texty.setTextSize(28);
texty.setText("Kool");
views.addView(texty);
}
});
cancelbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
dialog.cancel();
}
});
return true;
default:
return super.onOptionsItemSelected(item);
}
}
XML code:
<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:id="#+id/statslayout">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="#+id/xxx">
<TableRow
android:layout_width="fill_parent"
android:layout_height="100dp" android:id="#+id/tableRow3" android:layout_alignParentTop="true"
android:layout_alignParentStart="true" android:layout_marginStart="72dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Dumbbell Press Stats!"
android:id="#+id/textView"/>
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="100dp" android:id="#+id/tableRow"
android:layout_alignParentTop="true" android:layout_alignEnd="#+id/tableRow3"
android:layout_marginTop="49dp" android:layout_alignBottom="#+id/tableRow3">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Date"
android:layout_weight="0.22"
android:id="#+id/btnDate"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text=" Weight"
android:layout_weight="0.22"
android:id="#+id/txtWeight"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text=" Reps"
android:layout_weight="0.22"
android:id="#+id/btnReps"
/>
</TableRow>
<TableRow
android:layout_width="wrap_content"
android:layout_height="200dp"
android:layout_below="#+id/tableRow" android:layout_alignParentStart="true" android:id="#+id/tableRow4">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="20/08/15"
android:id="#+id/textView2" android:layout_below="#+id/tableRow"
android:layout_alignStart="#+id/tableRow3"/>
</TableRow>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text=" 8"
android:id="#+id/textView7"
android:layout_marginEnd="82dp" android:layout_below="#+id/tableRow"
android:layout_alignEnd="#+id/tableRow3"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="50kg"
android:id="#+id/textView6"
android:layout_marginStart="43dp"
android:layout_below="#+id/tableRow3" android:layout_toEndOf="#+id/tableRow4"/>
</RelativeLayout>
My end (dream) goal for this is by using Java I making complete perfectly formatted rows which contains the Date, Weight and Reps in their respected columns. And multiple rows of this or perfectly formatted using Java.
Image (this is in XML not in Java)

Rather than add TextView(s) programmatically, use a ListView. This will solve your problems entirely. You would use a custom adapter setAdapter() that your ListView would set as it's adapter (that provides the List it's data), and add new row elements each time you click your button that adds the new items. This would mean replacing your TableRow bit, and using a ListView in the RelativeLayout instead. Also, you could add a custom header view to the ListView to replace that header you already use (source: addHeaderView() )
Looking at your rows, it appears that they have the fields: "Date", "weight" and "reps". This would mean create a custom Java object that has those three fields, and make the the object type of your ListView adapter's elements. I can provide starter code if you REALLY need it, but it would help you best to use the documentation I provided to teach your self how to use the ListView.
Tutorial: ListView tutorial
Edit: Another bonus: ListView handles allowing the user to scroll as more, and more rows are added to this List of yours. More reason to just opt to a ListView :)

Trouble identifying the type of widget to expand/collapse an area

Consider the widget hello:
When clicked, it opens the area at the bottom with additional widgets (text, buttons, etcetera):
What is this kind of expand/collapse widget called?

One way to do this is to build your whole layout with the text and the buttons, but hide them initially by setting their visibility to gone or invisible. Then in code in the onClick listener of the "hello_text" text view, you can change their visibility to visible.
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/hello_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello_text" />
<TextView
android:id="#+id/the_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/my_text"
android:visibility="invisible" />
<LinearLayout android:id="#+id/btn_holder"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="invisible">
<Button android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_text1" />
<Button android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_text2" />
</LinearLayout>
</LinearLayout>
Now in your activity or fragment you can do:
TextView the_text_view = (TextView) v.findViewById(R.id.the_text);
LinearLayout ll_btn_holder = (LinearLayout) v.findViewById(R.id.btn_holder);
TextView hello_text_view = (TextView) v.findViewById(R.id.hello_text);
hello_text_view.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
the_text_view.setVisibility(View.VISIBLE);
ll_btn_holder.setVisibility(View.VISIBLE);
}
});

EditText resizing for no reason

Observing rather strange behavior in relative layout.
This is the initial state:
Defined as:
<EditText
android:id="#+id/bleedCount"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="#+id/abrMult"
android:layout_below="#+id/textView4"
android:layout_marginRight="10dp"
android:ems="10"
android:inputType="number"
>
<requestFocus />
</EditText>
<TextView
android:id="#+id/abrMult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/abrSubmit"
android:layout_alignBaseline="#+id/abrSubmit"
android:layout_marginRight="10dp"
android:text="x12" />
<Button
android:id="#+id/abrSubmit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView4"
android:layout_alignParentRight="true"
android:text="Calculate" />
On onItemSelected from the dropdown it is being changed like this:
abrSubmit.setText(pos == 1 ? "Calculate" : "Submit");
abrMult.setVisibility(pos == 1 ? View.VISIBLE : View.GONE);
bleedCount.setHint(pos == 1 ? "# of Meow/month" : "# of Meow/year");
and turns into this:
Notice how EditText bleedCount is way taller on the second picture. The value of bleedCount.getHeight() is changing from 72 to 95, and I can't understand what is causing it.

It's connected with android:ems="10"
When EditText changed it's width, after showing up of view with x12, it must have been splited into two lines.
ems has size of one letter for given font.
I think you don't need ems.
Set EditText as single lined: android:singleLine="true"

The bleedCount EditText resizing is due to your hint text becoming longer than a single line when (pos == 1).
If you comment out the following line in your code, the resizing will stop happening:
// bleedCount.setHint(pos == 1 ? "# of Meow/month" : "# of Meow/year");
Maybe you can make it shorter/smaller to prevent the resizing?

Okay, since I don't have your entire code base I put something simple together to replicate what you are doing. Just FYI, I am using ICS 4.1. I didn't have any of the problems you are having, so perhaps this is an API issue. Perhaps you can look at my code base and see where there are differences between it and your own. Therein may lie the solution.
XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_rl"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Top TextView" />
<Spinner
android:layout_below="#+id/textView4"
android:id="#+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_below="#+id/spinner1"
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Above EditText" />
<EditText
android:id="#+id/bleedCount"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView5"
android:layout_marginRight="10dp"
android:layout_toLeftOf="#+id/abrMult"
android:ems="10"
android:inputType="number" >
</EditText>
<TextView
android:id="#+id/abrMult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView5"
android:layout_alignBaseline="#+id/abrSubmit"
android:layout_marginRight="10dp"
android:layout_toLeftOf="#+id/abrSubmit"
android:text="x12"
android:visibility="gone" />
<Button
android:id="#+id/abrSubmit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView5"
android:text="Submit" />
</RelativeLayout>
Code:
public class ExampleActivity extends Activity implements OnItemSelectedListener {
private Button submitButton;
private TextView tv;
private Spinner spinner;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_example);
submitButton = (Button) findViewById(R.id.abrSubmit);
tv = (TextView) findViewById(R.id.abrMult);
spinner = (Spinner) findViewById(R.id.spinner1);
// create the data array for the spinner
String[] strings = { "This", "That", "The Other" };
// create the spinner adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, strings);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// set the adapter on the spinner
spinner.setAdapter(adapter);
// set the event listener for the spinner
spinner.setOnItemSelectedListener(this);
}
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
if (submitButton.getText().equals("Calculate")) {
submitButton.setText("Submit");
tv.setVisibility(View.GONE);
} else {
submitButton.setText("Calculate");
tv.setVisibility(View.VISIBLE);
}
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
Hope it helps...