Develop Reference

Android Spinner Not Working

I'm trying to implement an Android spinner in my app but am running into some problems with the java file associated with the Activity its placed in.
The errors I am getting are as follows:
1. setContentView(R.layout.activity_display_asleep_at);
- cannot be resolved or is not a field
2. cycles_array (where ArrayAdapter<CharSequence> is...)
- cannot be resolved or is not a field
3. spinner (where "android.widget.Spinner spinner" is...)
- cannot be resolved or is not a field
The code I have is as follows:
import android.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import android.widget.Spinner;
public class DisplayAsleepAt extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_asleep_at);
getActionBar().setDisplayHomeAsUpEnabled(true);
android.widget.Spinner spinner = (android.widget.Spinner) findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.cycles_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
Here is the xml file I am using:
<Spinner
android:id="#+id/AA_spinner_prompt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/AA_spinner_promptTXT"
android:layout_alignParentRight="true" />
And here is the strings.xml file I have the array in:
<string-array name="cycles_array">
<item>1</item>
<item>2</item>
<item>3</item>
<item>4</item>
<item>5</item>
<item>6</item>
<item>7</item>
</string-array>
If anyone has any ideas as to what might have gone wrong, it would be greatly appreciated. I can always post more if you need. Thanks all.
EDIT:
Here is the entire xml file I am using. I've been looking through it for a while and can't seem to find anything wrong with it...maybe I'm just tired at this point...
<RelativeLayout 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:paddingRight="5dp"
android:paddingLeft="5dp"
android:paddingTop="5dp"
android:paddingBottom="5dp" >
<TextView
android:id="#+id/AA_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/AA_titleTXT"
android:layout_alignParentTop="true"
android:layout_marginBottom="10dp"
android:textSize="35dp"
android:textStyle="italic"
tools:context=".DisplayAsleepAt" />
<TextView
android:id="#+id/AA_intro"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/AA_introTXT"
android:textSize="15dp"
android:layout_below="#id/AA_title" />
<Button
android:id="#+id/AA_button_pick"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:text="#string/AA_button_pickTXT"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
android:layout_centerHorizontal="true"
android:onClick="showTimePickerFragment" />
<TextView
android:id="#+id/AA_rem_cycles"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/AA_rem_cyclesTXT"
android:textSize="15dp"
android:layout_marginBottom="20dp"
android:layout_below="#id/AA_button_pick" />
<Spinner
android:id="#+id/AA_spinner_prompt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/AA_spinner_promptTXT" />
<TextView
android:id="#+id/AA_final_time"
android:layout_width="75dp"
android:layout_height="wrap_content"
android:text="#string/AA_final_timeTXT"
android:textSize="15dp" />
<Button
android:id="#+id/AA_create_alarm_button"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:text="#string/AA_create_alarm_buttonTXT"
android:layout_centerHorizontal="true" />
</RelativeLayout>

The error means there's something syntactically wrong with your XML layouts and R cannot be auto-generated. Try looking at your xml code and if you still have problem then post your xml code.
Change this code
android.widget.Spinner spinner = (android.widget.Spinner) findViewById(R.id.spinner);
To
android.widget.Spinner spinner = (android.widget.Spinner) findViewById(R.id.AA_spinner_prompt);
Hope it helps

Remove this line from your code :
import android.R;
and then Clean & Rebuild your project.

The spinner menu shows very long text, but not the triangle image

When I make the spinner with very long text, the spinner button (not drop down menu), which usually shows the selected text and the triangle image(▼), doesn't show the triangle image.
I tested with normal (android.R.layout.simple_spinner_item) layout and multiline layout.
But neither did.
The right side of spinner button is the outside of the window.
(Sorry, I can't attach the image because I'm a new user.)
The sources are following;
SpinnerTestActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class SpinnerTestActivity extends Activity {
String[] mStrings = {"verrrrrrrrrry looooooooooooooong",
"abc loooooooooooooooooooooooooong",
"xyz"
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner)findViewById(R.id.spinner1);
// ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, mStrings);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.multiline_spinner_item, mStrings);
spinner.setAdapter(adapter);
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/TableLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<Spinner
android:id="#+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</TableRow>
</TableLayout>
multiline_spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/text1"
style="?android:attr/spinnerItemStyle"
android:singleLine="false"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee" />

Thank you for your observations on my question.
I found the answer.
add
spinner.getLayoutParams().width = spinner.getWidth();
after
spinner.setAdapter(adapter);

Have you defined the android:prompt attribute in your Android Spinner controller?
It will help you. Please see the following code:
<Spinner
android:id="#+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/planet_prompt"
/>
You can refer to the following link: Can an Android AsyncTask doInBackground be synchronized to serialize the task execution?

Using custom title bar on select activitys within an app

Ok i will try to be as detailed as i can here. I have an app with multiple activities in it. Some of the activities I want to have a custom title bar on with an Image, then text, then image button navigating back to the home(aka main activity). Most of the pages i want the custom title bar on are list view pages. I have successively been able to load the custom title bar but it doesn't load any text field or images just the title bar with nothing in it. here is the code that i've used.
window_title.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:gravity="center_vertical"
android:paddingLeft="5dip"
android:background="#660000">
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/icon72" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.39"
android:gravity="right|center_vertical"
android:paddingRight="5dip" >
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:text="#string/app_name"
android:textColor="#FFFFFF"
android:paddingRight="5dip" />
<ImageButton
android:id="#+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#660000"
android:src="#drawable/home" />
<ImageView
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
custom_style.xml
<resources>
<style name="CustomWindowTitleBackground">
<item name="android:background">#660000</item>
</style>
<style name="CustomTheme" parent="android:Theme">
<item name="android:windowTitleSize">50dip</item>
<item name="android:windowTitleBackgroundStyle">#style/CustomWindowTitleBackground</item>
</style>
Classes.Java
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Classes extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);
setListAdapter( new ArrayAdapter<String>(this, R.layout.ministries, list));
ListView list = getListView();
list.setTextFilterEnabled(true);
list.setOnItemClickListener(new OnItemClickListener(){
I'm not sure what i'm doing wrong or where i need to make changes but I would like to be able to have this custom title bar on some of the activities and load the name of that activity in the title bar. I've looked at several tutorials and these two have helped but i'm kinda stuck a bit. http://staticallytyped.wordpress.com/2011/03/18/android-dynamic-and-custom-title-bars/
and this one has helped the most and what i basicly followed
http://www.londatiga.net/it/how-to-create-custom-window-title-in-android/
Thank you for any help you can give. I would have posted pics but haven't gotten that far on here yet so thank you again for any help
edit
the top image is what i want the title bar to look like and the bottom is what it looks like in app

YOu can use include tag of android to add your window_title.xml....
Refer :
android include tag - invalid layout reference
http://developer.android.com/resources/articles/layout-tricks-merge.html

Android XML Layout Problems

I was trying to create a row layout where each of my list item will have a template to follow. Currently I have this, which allows me to display a single line text in each list.
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="20sp"
android:padding="100dp" >
</TextView>
However, when I try to change it to allow me to add more items such as image buttons and more text field, it always doesn't allow me to compile.
I tried taking a piece of xml from a tutorial on developer.android's website,
<?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="wrap_content"
android:orientation="vertical">
<TextView android:id="#+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/text2"
android:textSize="16sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
But it throws me an error stating - The processing instruction target matching "[xX][mM][lL]" is not
allowed.
- error: Error parsing XML: XML or text declaration not at start of entity
Can someone help me with this? I am not too sure what this error means.
UPDATE:
what i am trying to do is to have a fragment like a side bar on the right which shows a list of items, with the first xml that i posted, i'm able to get the results i want, but i couldn't make any changes to it.
package com.project.test;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class TestListFragment extends ListFragment {
String [] Items = {"Item A", "Item B", "Item C"};
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.listtemplate, Items));
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
}
}

You would not believe the solution to this... I had the same issue and the answer was "remove all the white spaces before start the xml first line"

Might be because you are missing the starting tag of the LinearLayout?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView android:id="#+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/text2"
android:textSize="16sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Android dynamically change checkbox problem

I'm trying to change my checkbox dynamically.
for some reason the app throw my an exception.
what am I doing wrong?
this is my java code:
package com.school.commtest;
import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.TableLayout;
import android.widget.TableRow;
public class OtherPlacesMenu extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CheckBox c1 = (CheckBox)this.findViewById(R.id.schools);
c1.setChecked(true);
setContentView(R.layout.otherplacesmenu);
}
}
and this is the xml:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/table">
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow1">
<CheckBox android:text="School" android:id="#+id/schools" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow2">
<CheckBox android:text="Supermaker" android:layout_height="wrap_content" android:id="#+id/supermarkets" android:layout_width="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow3">
<CheckBox android:text="Gardens" android:layout_height="wrap_content" android:id="#+id/gardens" android:layout_width="wrap_content"></CheckBox>
</TableRow>
</TableLayout>
I'm sure its a simple question, but I cannot find the answer anywhere.
p.s.
I can't set the value of the checkbox to be true at the xml because I would later want to change the checkbox from the user setting.
10x!

Usually you should post the exception message when asking a question like this, but it looks like your problem is that you're trying to findViewById before you setContentView. Your view doesn't exist to be found when you look for it.