Android :: Loading Layout From XML Inside Of Derived Class

Mar 4, 2010

Right now I have a class that extends LinearLayout and builds the view inside of the constructor using a series of addViews. I wanted to move this into an XML file, so I have the same view defined there. My problem is that I can't figure out how to load the XML file in the constructor of the derived class. I looked up the LayoutInflater stuff, but I wasn't entirely sure how to use it in that context. Do I need to call addView() with the result of the LayoutInflater? Is this even possible? The other issue is that the context object that is passed in doesn't have the LayoutInflater methods. I'm not sure if I need an instance of Activity to do that.

Android :: Loading Layout from XML inside of Derived class


Android :: Using Class Derived From Text / View

Jun 19, 2010

CoreStartHere.java
public class CoreStartHere extends TabActivity {
t = getTabHost();
t.newTabSpec("tTask");
t.setIndicator(...);
t.setContent(new Intent().setClass(this, T1Task.class);
} t1Task.java
T1Task extends Activity {
onCreate(Bundle ...) {
:
myListview = (ListView) findViewById(R.id.hdListView);
myEditText = (EditText) findViewById(R.id.hdEditText);
hdItems = newArrayList <String>();
aa = new ArrayAdapter <String>(this, R.layout.hditemview, hdItems);
:
setOnKeyListener (new OnKeyListener() {
onKey(...) {
:
hdItems.add(0, myEditText.getText().toString());
aa.notifyDatasetChanged();
:
} } } }
hditemview.xml
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
class="com.a1.hd.hdRecordTaskListItemView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:scrollbars="vertical"
android:textColor="@color/HD_Text"
android:fadingEdge="vertical"
/>hdRecordTaskListItemView.java
hdRecordTaskListItemView extends TextView {
// has 3 constructors
// onDraw
}
None of the constructor in hdRecordTaskListItemView get invoked and not surprisingly onDraw does not get called either. The text appears with the default style. The onDraw is supposed to draw on the "canvas".

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Android :: Class Derived From Intent Service Must Have Default Constructor

May 8, 2009

I'm posting this to share the lessons I learned while working with IntentService. IntentService has a single constructor that takes a string argument "name". The documentation has no description of what name is used for. In looking at the sources, I found that its only use is in naming the worker thread for the IntentService. This thread is named IntentService [name].

I initially implemented the constructor of the derived class to also take a String argument and passed it along to the derived class. This is wrong. This will cause the startService() call to generated a java.lang.InstantiationException in the application containing the service i.e. you don't get the exception in the application calling startService(). A clue to the actual problem is a little further up in the logs:"newInstance failed: no <init>()"

The derived class must have a Default constructor and that constructor must call super() passing a string for the name component of the worker thread name.
public class MyIntentService extends IntentService {
public MyIntentService() { super("MyIntentService");
} @Override
protected void onHandleIntent(Intent intent) {
// Handle events on worker thread here }

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Android :: Multiple Custom View (Derived From Relative Layout) In One Line

Sep 15, 2010

I have created a custom view by extending Relative Layout and it looks like this: The layout for the view:

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content" android:gravity="center_horizontal">
<ImageView android:id="@+id/type_picture_preview"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:src="@drawable/type_picture_noimage" android:layout_alignParentRight="true"
android:paddingTop="15dip" android:paddingRight="15dip" />
<ImageView android:id="@+id/type_picture_delete"
android:src="@drawable/type_picture_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true" />
</RelativeLayout>
</merge>

I am struggling to get two or more layouts on a single line.

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Android :: How To Dynamically Remove Widgets From Layout Inside A Layout

Sep 6, 2010

I have LinearLayout. Inside to that i have added one more Linearyout ( checkbox & text ).

(LinearLayout) one textView, (LinearLayout) Checkbox,textview , one textview

Now whenever clicks the checkbox, i need to dynamically display EditBox after the checkbox.

code:..........

On the click of checkbox listener i added a code like below.

code:.........

I want to the layout which was added earlier.

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Android :: Android - Nesting Relative Layout Inside Linear Layout

Oct 15, 2010

I have the following code in my layout.xml.

code:............

In the eclipse Plugin layout creator, the EditText and button are shown properly. (see the below screenshot)

But on the device and emulator, the button is not hidden. (see the below screenshot)

why the button is getting hidden in the device?

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Android :: How To Play With Webview In Dialog / Loading It Inside?

Aug 5, 2010

I want to open twitter auth in my webview rather then opening in browser, any good tutorial how to play with webview in dialog and loading it inside dialog?

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Android :: Embed A Class Inside Textview Of Another Xml?

Nov 19, 2010

This is my layout...

This xml is the main.xml with main.java. How can i embed intro.xml with intro.java into the <Textview>?

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Android :: Sending A String Created Inside A Method To Another Class

Sep 12, 2010

I have code which has one activity which passes information to a second activity.
I can use this information to pass to a third activity with additional information from the result of the second activity.

I want to use gestures as a method of going back to a previous activity, but if I go back from the third to the second activity I need the information initially passed from the first to the second activity to still be present.

i.e.

First Acticity

what is Y?

answer y = 5

Second activity

User said Y = 5

what is X?

Third Activity

User said Y = 5
X = 6

Go back to Second activity but maintain the input of

User said Y = 5.

To do this I have used a bundle to pass the information between activities, but I can only access the info in the bundle from within a method within the class started by the intent.

The gesture controls are within another class, so I cannot access the bundle information from within this class as the getIntent command produces a not defined error.

What I need to do is to be able to pass the information from the bundle from the first activity to the gesture class so that I can pass it back when I go back using the gestures.

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Android :: Check For Internet Connection Inside An Anonymous Class?

Dec 30, 2009

I was trying to make an anonymous class to upload a file to a server.

I wanted to make that easily reusable much like some kind of component.

Everything works fine but as a final touch i wanted to add a function to check if internet connection is available.

Problem is, the call to the connectivity manager needs the Context :

ConnectivityManager connec = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE);

Since i'm in an anonymous class and I've read that it's not a good idea to pass the whole context to classes, I wondered about two things :

1 - Is there another way to check internet connection without the Context ? 2 - Why in Android internals make it necessary to have the context just to check if the device is connected to internet ?

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Android :: Add TextView Programmatically Inside A View-based Class?

Jan 11, 2010

I have been trying to find a solution for this for the last 3 days but i just failed hit a final answer!

I am creating a View-based class where i show a ball bouncing of the sides. I use a Timer to control the animation.

I want to add a TextView programmatically in my view class. I am trying to instantiate an object of TextView with reference to the context as follows code...

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Android :: ViewFlipper Not Working Inside A Class Which Extends LinearLayout / Reason Of It?

Apr 22, 2010

When I tried to create a ViewFlipper inside a class which extends LinearLayout, its throwing an exception

"java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()".

I am creating the ViewFlipper using,

ViewFlipper flipper = new ViewFlipper(ctContext);

But when I create the ViewFlipper in a class which extends Activity, its working normally. What may the reason?

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Android :: Loading 3D Models - OBJ File Into My Own Model Class

Mar 11, 2009

How are people here loading in their models? I'm just manually parsing a OBJ file into my own model class and drawing that.

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Android :: Inside Service Class / Executing Method For Toast From Scheduled TimerTask

Apr 30, 2010

I am trying to execute a {public void} method in Service, from scheduled TimerTask which is periodically executing.This TimerTask periodically checks a condition. If it's true, it calls method via {className}.{methodName};However, as Java requires, the method needs to be {pubic static} method, if I want to use {className} with {.dot}.The problem is this method is for notification using Toast(Android pop-up notification) and Status Bar.But for this to work, the method must not have {static} modifier and resides in Service class.So, basically, I want background Service to evaluate condition from scheduled TimerTask, and execute a method in Service class.Can anyone help me what's the right way to use Service, invoking a method when certain condition is satisfied while looping evaluation?

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Android :: Loading String Values From File Instead Of List In Class

Nov 1, 2010

I think I have a pretty easy problem to solve, but I have been beating my head against the wall for hours trying to get past it! I have an adapter that loads a list of URLS:
adapter=new MyAdapter(this, lStrings);
list.setAdapter(adapter);

The list of URLS looks like this:
private String[] lStrings={
"http://www.domain.com/file1.jpg",
"http://www.domain.com/file2.jpg",
"http://www.domain.com/file3.jpg",
};

What I want instead is to load these values from a text file that lies on the SD card. For that matter, I would be okay with loading the values from a text file into a String, and then load the String into the list as I imagine that would be the "cleaner approach". However, all attempts to do this have failed. For instance, I replaced the above snippet with this:

private String[] lStrings=
{ MainActivity.this.getString(R.string.myurllist) };
but then I get a Forced Close on loading.

I'm a bit new to Java, Android, and development in general.

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Android :: Dynamic Class Loading To Target Multiple Versions

Aug 20, 2010

I would like to make a single Android app for multiple Android versions (possibly every one of them)
My problem is that I want to check what is the version of Android the app is currently running on, and dynamically load a class which is version dependent. This part should be ok.

I just wonder how I can achieve that without compilation errors in my Eclipse project. I mean, the project is configured for a particular target (1.5, 2.1 ...), so if a class in my project is not compatible wich the selected target, it will result in errors.

Is there a way to export this classes even if they are not fit for the platform (I thought about a separated lib, but then again : how to compile theses classes into a lib without compilation pbs?) ? This should be ok since they won't be loaded until I ask them to after having checked Android version.

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Android :: Display An Application Inside A Layout?

Mar 1, 2010

I would like to know if it's possible to display an activity inside a layout of my activity. For example I would like to display the Phone application inside a layout of my activity.

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Android :: GridView Inside Linear Layout Displayed In Tab

Aug 13, 2009

I am trying to display a bunch of image icons in a grid view, with some basic inductive text on the top. This layout is inside a tab pane. For some reason my application just Fore closes without any stack trace when I do this. Here is my lay out file and the corresponding code that uses it in a tab.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/ android" android:id="@+id/welcomeLayout" android:orientation="vertical"> <TextView android:id="@+id/txtWelcome" text="@string/app_name" > </TextView> <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dp" android:id="@+id/welcomeGrid" android:horizontalSpacing="10dp" android:numColumns="auto_fit" android:stretchMode="columnWidth" android:gravity="center" android:columnWidth="120dp" android:verticalSpacing="15dp"/>
</LinearLayout>......

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Android :: Start An Activity Inside Any Layout In Droid?

Sep 24, 2010

I have created a an activity named Example which have 3 LinearLayouts . I want to start an activity. So I used the following lines of code...

Test is another activity. As a result of the above code a new activity is called in new page. But I want to get the same resule or start the activity inside 2nd layout of Example class.

How to achieve this.

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Android :: Setup OpenGL View Inside A Layout?

Nov 8, 2010

How do I set up an xml layout where an OpenGL view is part of it? As I do now is set the OpenGL view as the only view with setContentView(). But I would like to create an xml layout that includes the OpenGL view. Lets say I want to have the OpenGL view mainly and a small TextView at the bottom.

Is this even possible? Or can an OpenGL view only be the one and only view?

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Android :: Create UI - Put Five Buttons Inside A Linear Layout

Aug 10, 2010

In my app I want to create something like this: I thought to put five buttons inside a linear layout, but the problem is how to show the inner items at run time. Every time i click on a button i want to show the proper items and hide the others.

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Android :: Changing Values Inside Layout Included With Include

Oct 28, 2010

I have in many of my screens that re mostly constructed of LinearLayouts a FrameLayout that should take up the bottom leftovers of the screen (using layout_height="0dp" layout_weight="1") inside it there's a FrameLayout with gradients background and in it's middle with some padding lies a button with some text, naturally i need the text and onClicked properties to me different from screen to screen. I considered using <include > tag for the above compound in my layouts, but as far as i can see i can't really change (at least not in xml) the button text and callback, is that really so?

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Android :: Find Row / Column Of A View Inside Table Layout?

Feb 12, 2010

Suppose I have a view inside TableLayout, like this:

TableLayout tableLayout;
View view = (View)tableLayout.findViewById(R.id.control);


How can I find out the view's row/column within the TableLayout?

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Android :: Using ScrollView Inside Layout Xml File For A Widget - Got Error

Nov 22, 2010

I'm able to successfully use a ScrollView inside the layout xml file for an application. However, when I tried using a ScrollView inside the layout xml file for a widget, I get a "Problem Loading Widget" error as soon as I drop the widget in the emulator. If I comment out the ScrollView, then the widget shows up in the emulator. I've pasted my layout xml file below. Any thoughts on how to get past this error would be much appreciated.

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingBottom="3dip">

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingLeft="6dip"
android:paddingRight="6dip"
android:paddingBottom="3dip">

<Button
android:id="@+id/ok_widget"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="@string/button_ok" />
</LinearLayout>

<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:layout_marginBottom="50dip">

<LinearLayout
android:id="@+id/linear_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="3dip">

</LinearLayout>

</ScrollView>

<RelativeLayout
android:layout_marginTop="-50dip"
android:gravity="bottom"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingLeft="6dip"
android:paddingRight="6dip"
android:paddingBottom="3dip">
<Button
android:id="@+id/ok_widget"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="@string/button_ok" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>

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Android :: Class Initialization Issues Loading Java.util.logging.LogManager In Dalvik VM

Mar 18, 2010

I've done changes in an Android native library and installed a new system.img file but am now getting an unrelated Error on startup. I can get past it by swallowing the error but I wanted to know if anyone can explain what the issue is.

The Android implementation of Logger.java claims that it is Forcing the LogManager to be initialized since its class init code performs necessary one-time setup. But this forced initialization results in a NoClassDefFoundError. I'm thinking that it has something to do with the class not having been preloaded by Zygote yet but am not that familiar with the whole class loaders and VM business.

code:....................

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Android :: Systematic Distribution Of Views .xml Files Inside Layout Folder

Oct 14, 2010

I have multiple view. But for systematic distribution of views (.xml files inside layout folder). I would like to have different packages (/folders) inside Layout. Is It possible. @Attached : Screen shot. IF that is possible, is the following statement correct ?. If Not whats the solution?

setContentView(R.layout.payBill.payMyBill);............

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Android :: Access Views Inside Layout When I Reuse It Multiple Times?

Aug 6, 2010

I have read the Android UI trick 2 on Android developers, which tells people how to include a layout in another layout file multiple times, and give these included layouts different id. However, the sample here is overwriting the layout id, not the id of the views IN this layout. For example, if the workspace_screen.xml looks like this: And I include it three times in another layout file. Do I end up with three TextViews with id firstText, and another three with secondText? Isn't there an id collision? And how do I find the secondText TextView in the third included layout with findViewById? What should I input in the findViewById method?

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Android :: Loading More Than One Layout File For An Activity

Apr 29, 2010

How can we use more than one layout file. I have implemented a cutom dialog.That means i have created an layout file for dialog. And one layout file for my activity. But whatever the UI items in dialog layout ile if iam using them by findViewById it is giving me null

I will explain in details here @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); applicationContext=getApplicationContext();

Dialog folder=new Dialog(this); folder.setTitle("Creating folder"); folder.setContentView(R.layout.create_folder); TextView tv=findViewById(R.id.folder_text); //Here folder_text is in my second layoutfile ie in create_folder.xml //In the above statemet i got the null to tv variable. folder.show();

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Android :: Scroll View Inside Linear Layout Forces Buttons Offscreen

Nov 4, 2010

I'm trying to build an activity that has a checkbox on top, a button at the bottom, and a bunch of other widgets scrolling in between. Conceptually that'sWhen it renders I get the checkbox at the top, the stuff scrolling nicely underneath, but the Button drawn offscreen (I assume) below the ScrollView. The only way I can get the Button to be visible is to hard-code the height of the ScrollView, which of course only works on one screen-size. I've tried all combinations of gravity and layout_weight I can think of to no avail. Am I using the right combination of Views? Anybody managed to get this working?

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Android : Layout - Change The Text Color Of The Textview Inside The Listview Dynamically

Oct 17, 2010

Can I modify android.R.layout.simple_list_item_1? For eg., I want to change the text color of the textview inside the listview dynamically. For this, I need to get to the textview and change its color.. How can I do that?

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