Android :: GenerateId - Method For Dynamically Generated Views
Aug 30, 2010
Is there (or should there be), a generateId() method for dynamically generated Views? Take the RadioGroup example in APIDemos|App|Views. Radio buttons are added dynamically. For each button, you have to call setId(). To be notified when a radio button is selected, you register a onCheckedChange listener on RadioGroup and the callback method is oncheckedChange(RadioGroup, int checkedId). Since we are notified only the id of the checked view, shouldn't there be a way to uniquely generate the id? Say, a View.generateId() method... In the example, the ids are statically defined in ids.xml. However this limits the number of radio buttons. I have a real world example too: a Radiogroup with each choice representing a Wifi hotspot. So one cannot know in advance the number of hotspots.
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Mar 18, 2010
I have a button that launches the google maps app on my device via an intent. I want to be able to pass it a php page that generates a KML file.
I have done this on a website before using the googlemaps api in JS - but it doesn't seem to work on Android.
My php file is as follows;
CODE:..............
Launching with:
CODE:.................
It launches maps, finds the file - but won't display it 'because it contains errors'.
Is this just not possible, or are there other ways to construct the intent that might work?
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Jun 18, 2010
I'm trying to learn how to build apps for Android. The first simple app, which will become a component of a bigger app I hope to build, is to have a button on the screen where, when tapped, it adds something new to the view. For instance: Imagine a layout that only has a button:
[Create!]
When that button is pressed, the view gets a new row added to it:
[Create!]
A Something!..............
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Dec 13, 2009
In my main.xml layout file, I define a FrameLayout. Then in another layout file (say overlay.xml), I define another layout.
At runtime (onCreate) I want to create a new View object, set it's layout with overlay.xml, and add it to the frame dynamically. I need access to the elements of the overlay, to change text etc.
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Nov 19, 2010
I use a LinearLayout and first I have a MapView and below the map I have a TableLayout with informations fields.
Now I would like to add additional information fields (e.g. a new TableLayout) when the user select a specific menu item on the Options Menu. I would like to have these fields either between the MapView and the TableLayout, or on top of the bottom area of the MapView.
How can I add this TableLayout with additional information fields dynamically after the user has selected a menu item? How can I show it below the MapView or on top of the bottom area of the MapView?
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Mar 10, 2010
Dynamically i am creating the linear layout and adding the views to linear layout every 5 sec i need to update data to linear layout from db when i check logger output it is adding to linear layout but gui it is not updating for every 5 sec updation i am using scheduleatfixed timer task.
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May 25, 2009
I have a remove assistant app, which allows customers to perform a subset of functions of a desktop application, untethered. Results are communicated back & forth via messages left at a license server. In order to have a single source for the logic of the assistant, yet run on multiple platforms (Swing, MIDP, & Android), I write a driver composed of Database, Network, & Display pieces.
The Android driver is nearly complete, but I run into a brick wall when it comes to Tabs. All views are instanced calling code, not XML defined. I already have the view before I try to add it.
I tried sub- classing TabHost:
CODE:.................
As is shown in the code, it errors in setup. Looking further down in setup() I will also get this exception too: Your TabHost must have a FrameLayout whose id attribute is 'android.R.id.tabcontent
Is there a way to trick setup() into instancing me mTabWidget & mTabContent members?
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Jul 8, 2009
I am trying to load textView and CheckBox view dynamically to a LinearLayout. i am getting some Orientation problem while doing the same.I want these two view in a single row but i its coming as in different raw.
Below is may code:
CODE:..............
layoutxml is
CODE:..................
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Mar 8, 2010
To use as an example: lets say that I have 2 EditTexts and one Button that I'm using as a login form. I want the EditTexts to be the same size, one after the other, with the login Button half their widths. Something like this:
The only way that I've been able to find to make the button 1/2 the width (but still maintain it's dynamic sizing) is to use a TableLayout with an empty view as the first field. Something like this:
CODE:.............
That feels like a god-awful hack and there has GOT to be a better way. Do you know of one?
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Oct 15, 2010
I am trying to dynamically create a interface using a relative layout. I would like to align different views with each other and am finding the need to know the id of a previously created view so that I can use them in subsequent layout params.
Is there a preferred or best way to generate or create ids for views that are created dynamically?
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Aug 13, 2010
I'd like to dynamically apply styles to my views at runtime.
Is there any method like View.setStyle(int style)?
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Oct 27, 2010
I have a ViewGroup that gets inflated dynamically. I have set Id's to all the inflated views. I am still not able to retain the inflated ViewGroup whenever the orientation is changed. Any particular check that i am missing here ?
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Nov 18, 2010
As I say in the topic, I want my WebView to prevent from reloading the webpage when another activity comes to the foreground or just when the orientation is changed. The reason why is because the WebView content is generated by Javascript/AJAX almost completely. After searching on a couple of forums, I found out many people suggested to use "saveState" and "restoreState" methods, but when I look the documentation, it says:Please note that this method no longer restores the display data for this WebView. See savePicture(Bundle, File) and restorePicture(Bundle, File) for saving and restoring the display data.So, here I was using that savePicture and restorePicture as it follows:protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); some other lines
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.webview);
if (savedInstanceState == null){
loadInicialWebUi();
}else{ mWebView.restoreState(savedInstanceState);
boolean restoredPic = mWebView.restorePicture(savedInstanceState, new File("savedDisplayWebView.temp"));
Log.d(TAG, "restored Picture:" + restoredPic);
@Override protected void onSaveInstanceState(Bundle savedInstanceState) {
mWebView.saveState(savedInstanceState);
boolean savedPic = mWebView.savePicture(savedInstanceState, "savedDisplayWebView.temp");
Log.d(TAG, "saved Picture:" + savedPic);
super.onSaveInstanceState(savedInstanceState);
}And well, those logs were revealing that it saves the picture, but it couldn't restore it. I suspect there might be something about the File references, but I couldn't think of a better way of getting the reference of the File I created when saving the state.Anyone thrilled?
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Mar 7, 2010
Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.
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Sep 7, 2010
I'm trying to override the onBackPressed() method of the ActivityGroup class:
public class MyClass extends ActivityGroup {
@Override
public void onBackPressed() {
// do something
return;
}
but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method. I'm relatively new to Java, I've seen here that people do it and it works for them Why I'm getting this error? I'm writing an app for android 1.5, could the problem be here?
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Nov 22, 2010
In Eclipse, when I mouse hover over a built-in method, it displays a method definition including stuff like what the method does, input objects, return objects etc. If I have a yellow line (warning) under the method I'm trying to use, I can't get the mouse-over to show the definition. If I try hitting F3, I get a "The Jar of this class file belongs to container "Android 1.6" How do I show the definition of the method I am using when there is a warning?
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May 12, 2010
I am trying to use annotation - method.getAnnotation( ) or method.isAnnotationPresent( ) and it is not working. I am using eclipse emulator for 2.1 OS version with JDK 1.6. Following is information about what I did..................
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Aug 11, 2010
The automatic generation of the R class does not work anymore. I have tried Project -> Clean.A warning on all xml files has also showed up: No grammar constraints (DTD or XML schema) detected for the document." Maybe that is why the code generation have stopped. Any idea how to get the R class generated again?
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Jul 23, 2009
I've been working on a project for several weeks now, and just tonight I started having a problem. The R.java file is no longer being generated. I've attempted to clean the project (the first time I do this it removes the R.java file but doesn't regenerate it) and have tried uninstalling and reinstalling the SDK. I've also tried resetting adb to no avail.
This problem does not occur in my other Android projects. They clean just fine and regenerate the R.java file like nothing is wrong. This particular project is the only one suffering from this problem.
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Aug 12, 2010
I downgraded to Eclipse 3.5, and the following still doesn't happen when I build a project in Eclipse:
1. .aidl files don't get processed (at all).
2. R.java isn't generated.
Used to work. What the heck?
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Apr 15, 2010
Building our Android app from Ant fails with this error:
[apply]
[apply] UNEXPECTED TOP-LEVEL ERROR:
[apply] java.lang.OutOfMemoryError: Java heap space
[apply] at java.util.HashMap.<init>(HashMap.java:209)
[apply] at java.util.HashSet.<init>(HashSet.java:86)
[apply] at com.android.dx.ssa.Dominators.compress(Dominators.java:96)
[apply] at com.android.dx.ssa.Dominators.eval(Dominators.java:132)
[apply] at com.android.dx.ssa.Dominators.run(Dominators.java:213)
[apply] at com.android.dx.ssa.DomFront.run(DomFront.java:84)
[apply] at com.android.dx.ssa.SsaConverter.placePhiFunctions(SsaConverter.java:265)
[apply] at com.android.dx.ssa.SsaConverter.convertToSsaMethod(SsaConverter.java:51)
[apply] at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:100)
[apply] at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:74)
[apply] at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:269)
[apply] at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:131)
[apply] at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:85)
[apply] at com.android.dx.command.dexer.Main.processClass(Main.java:297)
[apply] at com.android.dx.command.dexer.Main.processFileBytes(Main.java:276)
[apply] at com.android.dx.command.dexer.Main.access$100(Main.java:56)
[apply] at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:228)
[apply] at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
[apply] at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
[apply] at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
[apply] at com.android.dx.command.dexer.Main.processOne(Main.java:245)
[apply] at com.android.dx.command.dexer.Main.processAllFiles(Main.java:183)
[apply] at com.android.dx.command.dexer.Main.run(Main.java:139)
[apply] at com.android.dx.command.dexer.Main.main(Main.java:120)
[apply] at com.android.dx.command.Main.main(Main.java:87)
BUILD FAILED
Ive tried giving Ant more memory by setting ANT_OPTS="-Xms256m -Xmx512m". (This build machine has 1Gb RAM). Do I just need more memory or is there anything else I can try?
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Nov 3, 2010
I am doing the Notepad tutorial, exercise 2. I started by creating a new Android project and chose Create from source to import the downloaded source files for the excercise. But now I get many errors in Eclipse, and the problem is that there is no generated R.java class. How can I solve this? The folder gen / is empty. I have errors on Notepadv2.java and in res/layout/note_edit.xml and both seems to be related to the fact that the generated R.java is missing. Here is my import statements in Notepadv2.java:
import android.R;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
They are created by the Eclipse command Ctrl+Shift+O.
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Dec 21, 2009
I am currently working on a project which requires me to use an XML document to render a form on an Android device. The form must be fetched and displayed at run-time. I am wondering if there is a way to tag the form XML, transform it using XSLT into an Android layout XML, and then have the device render it.
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Jan 24, 2009
Apt while generating the resources, is it possible to provide a different package name for the generated R.java class. Currently it seems to use the same package name as the one in manfifest defination of AndroidManifest.xml <manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.tejasoft.dialer.mobile.android"> Also, is there a way to give custom class name instead of default R name say Resources.
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