Android : Create FindViewById Parm Dynamically Or Programmatically At Runtime
Sep 27, 2010
I have an xml layout that will display a grid made up of textviews within tablerows. The textview names are cell00, cell01, etc. At runtime, my program will determine which cell needs to be changed.
Is there a way get format a name so that it can be passed to the findViewById method at runtime? For example, if cell00 is needed, how can I generate the parm in this code?
TextView currcell = (TextView) findViewById(R.id.cell00)
Something like "cell"+00 doesn't compile because the findViewById method doesn't accept a String type. I don't want have every textview name in the grid hardcoded in the program - there must be a better way.
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Mar 18, 2009
I am storing the required test.jar file in the /sdcard. I want to load it dynamically at runtime and want to execute a function xyz() resides in that. For this purpose I had written following code:
But got ClassCastException : dalvik.system.PathClassLoader
Following is my code ,
import java.io.File; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.net.URL; import java.net.URLClassLoader;
import android.app.Activity; import android.os.Bundle; import android.util.Log;
public class Collabera extends Activity {
/** Called when the activity is first created. */
private static final Class[] parameters = new Class[] { URL.class };
public static void loadURLClass(String classPathURL) throws IOException {
File f = new File(classPathURL);
URL url = f.toURL();
URLClassLoader systemLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
Class systemLoaderClass = URLClassLoader.class;
try { Method method = systemLoaderClass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(systemLoader, new Object[] { url });
} catch (Throwable t) { t.printStackTrace();
throw new IOException( "Error, could not add URL to system classloader");
} }
@Override
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i("See","**************Before Loading Class Path**************");
try { Class.forName("test.Test1");
} catch (ClassNotFoundException e) { System.out.println(" Test Class Not Found ....");
} Log.i("See","**************After Loading Class Path**************");
try { loadURLClass("//sdcard//test.jar");
Class c = Class.forName("test.Test1");
Log.i("See"," Test Class Found ....");
Method method = c.getMethod("xyz", null);
Object o = c.newInstance();
String s = (String) method.invoke(o);
Log.i("See","Got method: " + s);
} catch (ClassNotFoundException e) { System.out.println(" Test Class Not Found ....");
} catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace();
} } }
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Nov 20, 2010
My application requires 2 screens and for this I have created two different XML layout files using RelativeLayout. One layout file loads whenever I run my Activity. Now I want to load the second layout on to the same Activity , when user click on a button in OptionsMenu and also when user press Back button the first screen loads instead of exiting the application. So that i don't need to create another Intent in my application.
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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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Jul 29, 2013
I am using and android 2.2 phone for testing and getting an error.
07-27 01:24:55.692: W/System.err(14319): java.lang.ClassNotFoundException: com.shoaib.AndroidCCL.MyClass in loader dalvik.system.DexClassLoader@43abbc20
First I wrote the following class:
Code:
package org.shoaib.androidccl;
import android.util.Log;
public class MyClass {
public MyClass() {
Log.d(MyClass.class.getName(), "MyClass: constructor called.");
}
public void doSomething() {
Log.d(MyClass.class.getName(), "MyClass: doSomething() called.");
}
}
And I packaged it in a DEX file that I saved on my device's SD card as `/sdcard/testdex.jar`.
Then I wrote the program below, after having removed `MyClass` from my Eclipse project and cleaned it:
Code:
public class Main extends Activity {
[MENTION=1299008]supp[/MENTION]ressWarnings("unchecked")
[MENTION=439709]override[/MENTION]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
[code]....
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Mar 13, 2014
is there a way to programmatically configure orientation in android application at runtime ?
(I want to allow portrait in phones and portrait/landscape in tablets)
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Jan 20, 2009
I am trying to create small simple application on emulator. I want to create button and display with some click event. I am not able to use findViewById method with R.id.abc. It always gives error as R.id cannot be resolved.
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Jul 16, 2010
first of all: yes, I read all the other threads on this topic. And not only those from this site... (you see, i'm a little frustrated) Most of them come with the advice to use "android:id" instead of just "id" in the xml file. I did. From others, i learned, that View.findViewById works different than Activity.findViewById. I handled that, too.
in my location_layout.xml i use
<FrameLayout .... >
<some.package.MyCustomView ... />
<LinearLayout ... >
<TextView ...
android:id="@+id/txtLat" />.................
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Oct 15, 2010
I want to create n number of rows at runtime after clicking button and 2 number of columns for each rows. I had tried but can't succeed. Anybody knows how to do this?
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Apr 5, 2010
I am having image large size image, at run time i want read image from storage and scale it so that its weight and size will be reduce and i can use it as thumbnail when user click on thumbnail i will display full size image.
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Jul 22, 2009
I have been searching forever and have not found a way to create a horizontal progress bar at runtime (I don't want to use XML). How can I set this XML attribute, as seen in this post http://groups.google.com/group/android-beginners/browse_thread/thread..., programmatically?
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Nov 8, 2010
I am a new developer in android, and I see some examples about activity, but I don't know How can I create the widget dynamically?
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Jan 11, 2010
How can you dynamically create a CheckedTextView in android [without creating a new implementation]?
It seems CheckedTextView is abstract ... (which does not make any sense at all) because I keep getting the compile time error: "Cannot instantiate the type CheckedTextView"
Using Android 1.5
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Oct 15, 2012
I plan to create a runtime for hosting (inner) JavaScript apps using Cordova.
1. There should be a host app acting as the runtime. In this Host-App, it should able to load JS/Html Apps dynamically. Same goes for removing.
2. Also, the inner JS/Html Apps should be able to communicate with each other.
Important is
- that the loaded JS/Html should call native functions like contact list (thats why Cordova should be used)
- and the JS/Html is not necessarily on the device when the apk is created. Hence, it should be able to download the sources and show them in the native app.
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Mar 12, 2010
Kindly somebody tell how to create rows dynamically via code in TableLayout.
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Oct 4, 2012
i have to create expandablelistview is dynamically.how can i do.
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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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Nov 1, 2010
I'm trying to create table row and place 3 elements: EditText - EditText - ImageButton as following:................
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Aug 10, 2009
I want to create an XML file to Store my Application Settings into. ( I can't use SharedPrefs because i want that Settings file later to be accessed by Some other Code.)
I can easily create an XML with java's code and store it in File too. but in Android I can create xml with the same java code but can't save it into the file coz they have removed the package javax.xml.transform from SDK.
I am Attaching the Java code here...
CODE:....................
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Sep 15, 2010
I am new in Android. whats the wrong with the following code:
CODE:.................
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Jul 28, 2010
I want to launch an Activity with a webView as its content from current Activity. This new activity needs to be transparent and webview should be in the center. I looked around the web but only solutions I found were using style xmls. I want to do it using pure code i.e. no xml declarations. if anybody has come across this then please shed some light.
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Nov 22, 2010
I know how to create Open/WEP/PSK/PSK2 configuration programmatically.
CODE:...........
But how do I create one for '802.1x EAP'?
Looking into the source code at:
CODE:..............
Seems to do the work but 'config.eap' is not accessable from my application.
Is there a way to configure EAP types or is it not possible?
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Mar 5, 2010
Is it possible to programmatically create and/or destroy AppWidgets?
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Jul 17, 2010
Is there a way i can create a view and add some textviews into it ? programmatically ? any sample code?
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Apr 17, 2010
I need some help with the following scenario, as I am so used to make all of my layouts with XML, but now I have a situation where that won't work.
I am working on the second version of my app that delivers news, in the comments section I used to use a listview to display user comments, but it doesn't work that great for comments that could be anywhere from 5 to 500+ characters long. So I want to create a whole bunch of TextViews in a scrollview and stack them below each other.
My best guess was this, although it is definitely wrong because it only shows one comment. I assume I have to use some kind of LayoutParams and so I've looked into it but am still not sure how exactly to use them.
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May 6, 2010
I'm all new to Android and I'm trying to create a spinner programmatically and feeding it with data from an array, but Eclipse gives me a warning that I can't handle.
Here's what I got:
This ArrayList holds the elements that should be in the spinner (gets filled from a file later on):
ArrayList<String> spinnerArray = new ArrayList<String>();
This is code ...
Now the second line (ArrayAdapter...) gives me a warning in Eclipse saying "ArrayAdapter is a raw type... References to generic type ArrayAdapter<T> should be parameterized", I have no idea how to fix this (or what that means in the first place :) ).
It's just a warning and the App seems to run alright, but I'd still like to understand what's wrong and fix it.
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Oct 28, 2010
How to create a folder in main screen programmatically?
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Jul 21, 2009
In ApiDemo, there is a progressBar demo. It creates a horizontal progress bar with a xml.
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Mar 2, 2010
Does Android have a "best practices" guideline on creating & populating the db/tables programmatically vs. deploying a .db file in assets?
What are the pros/cons of both approaches?
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Oct 7, 2011
public class SamActivity extends Activity
{
private Paint mPaint;
private MaskFilter mEmboss;
private MaskFilter mBlur;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
[code].....
This is my code.In this i draw a line over the image.Now i want to know how to create button programatically?
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