Does anybody know how to programmatically set the text of a button?
thing is i'm not calling this from the main layout(setContentView) i'm calling it in a view thats inflated after an asynctask
heres what i have tried but this is giving a null pointer exception on the 2nd line
Button mButton=(Button)findViewById(R.id.contact);
mButton.setText("number");
heres my layout where i am calling the button
<Button
android:id="#+id/contact"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/address"
android:layout_toLeftOf="#+id/badge"
android:background="#drawable/ic_btn_call"
android:textSize="10dp"
android:textStyle="bold"
android:textColor="#color/white"/>
here my view i'm inflating
ClubInfo = LayoutInflater.from(getBaseContext()).inflate(R.layout.clubinfocell,
null);
TextView TeamNameText = (TextView) ClubInfo.findViewById(R.id.TeamName);
TeamNameText.setText(teamName);
TextView AddressText = (TextView) ClubInfo.findViewById(R.id.address);
AddressText.setText(address1);
Button mButton=(Button)ClubInfo.findViewById(R.id.contact);
mButton.setText(telephone);
Then use your view's object to initialize it:
Button mButton = (Button)your_view_object.findViewById(R.id.contact);
mButton.setText("number");
When you try to identify a view other than your Activity's layout, you have to pass the reference of that view like this. If not Android will keep looking for this element from the layout which you provided in the setContentView().
For example, consider you have inflated a view like this:
View View = mInflater.inflate(R.layout.gridelement, null);
Then use this View's object for the Button present in that inflated layout:
Button mButton = (Button)View.findViewById(R.id.contact);
change your code as:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);//set layout here in which u have add contact in xml
Button mButton=(Button)findViewById(R.id.contact);
mButton.setText("number");
EDIT:
Your \res\layout\main.xml look like as:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/contact"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/address"
android:layout_toLeftOf="#+id/badge"
android:background="#drawable/ic_btn_call"
android:textSize="10dp"
android:textStyle="bold"
android:textColor="#color/white"/>
</LinearLayout>
your mButton is null.so NPE.are you refrenced xml resources after setContentView
onCreate(){
...
setContentView(R.layout.yourlayout);
Button mButton=(Button)findViewById(R.id.contact);
mButton.setText("number");
}
check R.java files import statement
are you sure that you have import it of the project you use ..
and just format your layout (.xml ) file save it and again type the same statement
Related
Just wondering if any of you guys could help me to access an element from an 'include' layout file which is inside not an activity but a fragment?
Most posts tell me to do something like that:
How to access Button inside "include" layout but as I am not on an activity the listener for the image won't work.
Ps: The listener works (opens the nav drawer) when I call an element which is not in the include file but on the fragment layout.
That's what I have inside the onCreateView method for my fragment:
View myLayout = view.findViewById(R.id.layout_top_bar);
image = (ImageView) myLayout.findViewById(R.id.image_left_top_bar);
image.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MainActivity mainActivity = (MainActivity)getActivity();
mainActivity.openMenuDrawer();
}
});
That's my include layout file:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_top_bar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp">
<ImageView
android:id="#+id/image_left_top_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/hamburger_icon" />
And that's how I'm including it within the fragment layout file:
<include layout="#layout/top_bar" />
Thanks very much for any help on that! :)
You can access it directly with the root layout of your fragment like this.
image = view.findViewById(R.id.image_left_top_bar);
In case we are adding the layout dynamically by inflating it, we use the approach you mentioned above but that's not needed here.
Put a id to the Layout and later access to the elemento.
View myLayout = findViewById( R.id.layout );
View myView = myLayout.findViewById( R.id.item );
Change:
getLayoutPosition()
For
getAdapterPosition()
I have got an idea to get rid of some coding when we do initializion of views.
When we create an xml layout in android. At that movement same name class is created with UpperCase Letters with a dialogue with permission. And as i created views with ids. It should create Views and initialize them automatically.
for e.g
close.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/closeBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/close_img" />
<TextView
android:id="#+id/closeText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Testing Text" />
</LinearLayout>
And automatically generated java code should be.
public class Close extends Activity
{
TextView CloseText;
Button CloseBtn;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CloseText = (TextView)findViewById(R.id.closeText);
CloseBtn = (Button)findViewById(R.id.closeBtn);
}
}
I can read xml and do the other stuff as I explained. But how could i add this module to eclipse and How could i create a service which work in Background all the time in eclipse.
Suggest me how to add this module(Plugin) to eclipse and i am going to use JAXB to generate Java Objects from XML document. Is there any better option.
Here in this website i find that just paste the xml and you will get your java code ready for activity class.
i had attached the link
I have a activity in Android TextView followed ListView again TextView. The content of first TextView fills the whole screen and in order to see the ListView and second TextView the user has to scrolldown. Now I wish to show the second TextView when activity start instead of first TextView.
Instead I want TextView2 to be visible when activity starts.
EDITED
Sample code as per advice of #Urban
public class FocusTestActivity extends Activity {
private static final String TAG = "FocusTestActivity";
ScrollView scroll;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView text1 = (TextView) findViewById(R.id.text1);
TextView text2 = (TextView) findViewById(R.id.text2);
TextView text3 = (TextView) findViewById(R.id.text3);
String hello = "We provide services to K-12 education sector."
+ "Our services include Feasibility report, Marketing, Curriculum design"
+ "Teachers planning, Design and Technology, Parents expectation"
+ "management, Transport planning, Day-to-day operations and Statutory"
+ "compliances. Please find a brief introduction attached with mail. Also visit"
+ "www.wissenways.com We can help you with overall process of setting-up school. We have"
+ "experience include establishing International, pre-school and CBSE"
+ "schools from scratch. Please feel free to contact if you need some help in your school venture."
+ "Best of Luck!<br/><br/>";
text1.setText(Html.fromHtml(hello));
text2.setText(Html.fromHtml(hello));
text3.setText(Html.fromHtml(hello));
ScrollView scroll = (ScrollView) findViewById(R.id.scrollcontainer);
}
public void onStart() {
super.onStart();
Log.d(TAG,"Inside onStart");
scroll.post(new Runnable() {
#Override
public void run() {
scroll.fullScroll(ScrollView.FOCUS_DOWN);
}
});
}
}
XML Code
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scrollcontainer"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="#+id/text1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
android:textSize="17sp"/>
<TextView
android:id="#+id/text2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
android:textSize="17sp"/>
<TextView
android:id="#+id/text3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
android:textSize="17sp"/>
</LinearLayout>
</ScrollView>
LOGCAT output:
getScrollView().post(new Runnable() {
#Override
public void run() {
getScrollView().fullScroll(ScrollView.FOCUS_DOWN);
}
});
Using this code in the onCreate should start the scrollview (in which your list and two text views are) at the bottom position. I dont know why you would want to do that, and im guessing there could be a better way to do what you want rather than forcing the scroll position to the bottom, but anyways...
This is the question from where the above code is taken from, you couldve searched for it.
Hope this helped.
Here are 3 simple options i can give you:
Change there places
Make another activity with the second textview and launch that activity first then show you current one
Show a Toast with the text in the second textview at the start of your activity (problem with this one is the user closes it and you want to show it again or user wants to see it again you need to launch a new toast)
I don't fully understand your difficulty with this problem
EDIT:
when must the first textview display at the top? if never just do the first option :\ if under some event, have a empty textview at the top and at the bottom and by code change it's text to what you want at the moment you want
You could also use in your xml file a RealtiveLayout
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
<TextView
android:id="#+id/txtview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ListView
android:id="#id/android:list"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_below="#id/textview2/>
<TextView
android:id="#+id/txtview1"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_below="#id/android:list"/>
</RelativeLayout>
I've created a countdown timer that counts Days:Hrs:Mins:Sec. using regular text view and updating it using my handler works fine for me.
however I want to create a cool animation for the changing digits:
1st Q:
I have 2 options as I see it to draw the numbers:
1. using a home made font applied with a style
2. using a textview/btn with no text on them and applying a backrgound image using setBackgroundResource()
--what should I choose?
2nd Q:
I've created a wrapper for ViewFlipper(not extending it)
public class transitionair extends Activity {
SpecialFlipperWrapper m_thousand;
SpecialFlipperWrapper m_hundred;
SpecialFlipperWrapper m_tens;
SpecialFlipperWrapper m_ones;
#Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
ViewFlipper flipper_Tsnds=(ViewFlipper)findViewById(R.id.yearThousand);
m_thousand = new SpecialFlipperWrapper(flipper_Tsnds, this, 9);
ViewFlipper flipper_Hndrds=(ViewFlipper)findViewById(R.id.yearHundread);
m_hundred = new SpecialFlipperWrapper(flipper_Hndrds, this, 9);
ViewFlipper flipper_Tns=(ViewFlipper)findViewById(R.id.yearTens);
m_tens = new SpecialFlipperWrapper(flipper_Tns, this, 9);
ViewFlipper flipper_Ons=(ViewFlipper)findViewById(R.id.yearOnes);
m_ones = new SpecialFlipperWrapper(flipper_Ons, this, 9);
m_thousand.startFlipping();
m_hundred.startFlipping();
m_tens.startFlipping();
m_ones.startFlipping();
}
}
however trying to fetch one of the latter views that come after the yearThousand id are retrieving null
XML I'm Using is:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<ViewFlipper
android:id="#+id/yearThousand"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ViewFlipper
android:id="#+id/yearHundread"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ViewFlipper
android:id="#+id/yearTens"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ViewFlipper
android:id="#+id/yearOnes"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
ps xml's for the animation itself are working so I left them out
Main questions is: can I make it better?
second question is: how?
third question is why is my layout returning null on the second call to it and how can I avoid it?
10XX
I have a bug with my activity.
I have three view stubs in my linear layout like so -
<ViewStub
android:id="#+id/index_1"
android:layout="#layout/index_edittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ViewStub
android:id="#+id/index_2"
android:layout="#layout/index_edittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ViewStub
android:id="#+id/index_3"
android:layout="#layout/index_edittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
my onCreate conditionally checks what to inflate:
for (int i = 0; i < 3; i++) {
int id = convertIndexToId(i); //will turn i into R.id.index_1
ViewStub stub = findViewById(id);
if (bShouldBeSpinner) {
stub.setLayoutResource(R.layout.index_spinner);
View root = stub.inflate();
Spinner spin = (Spinner)root.findViewById(R.id.my_spinner);
spinner.setAdapter(adapter);
spinner.setSelection(0);
}
else {
stub.setLayoutResource(R.layout.index_edittext);
View root = stub.inflate();
EditText et = (EditText)root.findViewById(R.id.my_edittext);
//et.phoneHome(); just kidding
et.setText(String.valueOf(System.currentTimeMillis()));
}
}
I force bShouldBeSpinner to false. The output of the edittext's is as follows:
1300373517172
1300373517192
1300373517221
However, when I rotate the screen and onCreate is called a second time the output is this:
1300373517221
1300373517221
1300373517221
Initially that made me think you should only inflate the view once, and the heirarchy is kept inbetween onCreate's... however when i only run it the first time the second time no views are shown for the stubs.
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Spinner style="#style/SearchInput" android:id="#+id/my_spinner" />
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<EditText style="#style/SearchInput" android:id="#+id/my_edittext" />
</LinearLayout>
I feel the documentation is assuming something that I did not notice or am missing. Does anyone see what I am doing wrong?
EDIT
I added to the view stubs android:inflatedId="index_1_root"... etc
it is the strangest thing, when I add these lines after the for loop:
EditText v = indexRoot1.findViewById(R.id.index_edit_text);
Log.d(TAG, "EditTExt: " + v);
EditText v2 = indexRoot2.findViewById(R.id.index_edit_text);
Log.d(TAG, "EditTExt: " + v2);
the output says (I believe) they are references to different EditTexts.
EditTExt: android.widget.EditText#47210fe8
EditTExt: android.widget.EditText#47212ba8
So they are getting inflated again, but the text is set to what the last edittext was set to on the first pass.
There may be some issues when recreating views of different types with the same id.
ViewStub is replaced by inflated view.
I suggest using
setInflatedId(int inflatedId)
to distinguish inflated views.
Hope that help.
Instead of using ViewStubs, I added an id to the root of those stubs (android:id="index_roots") and used
view.addView( (isSpinner) ?
new Spinner(this) : new EditText(this) );
to fix this problem, I will however not accept this answer right away, I'll allow others to answer using the method I was going for.