Android :: Provide Context To Call Necessary Functions In Own Utility Class?

Nov 11, 2010

Sometimes I need to provide a Context object to call specific functions, such as

Intent intent = new Intent(context, MyClass.class);

in order to start a service

context.startService(intent);

Or, provide a Context object to do a query

Cursor cursor = context.managedQuery(uri, projection, null, null, null);

If this is done in a UI class which extends Activity, that's fine.
However, If I want to create my own utility class (a singleton) that doesn't extend anything and call these functions, I don't have necessary Context object. Now my workaround is to pass an activity reference while initializing the utility class and have that reference to call those functions. I'm wondering what's the correct way to do that. It should not be reasonable to have every class to extends Context so that it can call those functions.

Android :: Provide Context to call necessary functions in own utility class?


Android :: Utility Class For Database Query

Sep 23, 2009

Can anybody suggest what functionality to provide in a query utility class/classes? The idea is to provide a database utility package for android developers. I just wanna do it for android community and of course for my learning.:-)

View 5 Replies View Related

Android :: Context To Use In A Activity Class?

Mar 3, 2010

I have a class defined as

public class viewGroups extends ListActivity

Somewhere in the class I have

objItem = new clsContactGroups(context);

I am wondering what is advised to be used here? Which context?
I know four choices, but maybe there are others...

this
this.getApplicationContext()
this.getBaseContext()
this.getParent()

I use this Context to show a Toast. So I would like to show on the front-most view visible.

View 1 Replies View Related

Android :: Start An Activity From A Non-context Class?

May 4, 2010

For example, I have an activity that uses a utility class. I would like to be able to start an activity from the utility class and have the activity result sent back to the utility class.

The only way I could think of starting the activity was to pass the original activity to the utility class, so that the utility class could use the original activity to start the activity. The problem with this is that the activity is sent to the original activity, rather than the utility class.

I also thought of actually making the utility class an activity itself, but that would make using the utility class much more complicated.

View 10 Replies View Related

Android : Access Context Of A Class Which Is Not An Activity?

Jan 28, 2009

Can anyone tell me how to access context of a class which is not an activity?

View 10 Replies View Related

Android :: Access Drawable Resources From A Not Context Class?

Nov 7, 2010

So I'm defining a class that sets a Drawable attribute in an object. The problem is that I can't access the getResource().getDrawable(int resourceId) method unless I have some Context.
So what I did was to send to that class an activity instance (let's call it "act") and then I did:

act.getResources().getDrawable(R.drawable.whellchair)

but, when executing that line it throws a NullPointerException.

When idea how to accomplish this?

View 2 Replies View Related

Android :: Call Activity Class From Other Java Class?

Oct 8, 2010

I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.

public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{

}
}

and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.

View 1 Replies View Related

Android :: Change Context For FindViewById To Super From Inline Class

Mar 12, 2010

I am trying to get the value of a EditText in a dialog box. A the "*"'ed line in the following code, the safeNameEditText is null; i am assuming because the 'findVeiwById' is searching on the context of the 'AlertDialog.OnClickListener';

How can I get/change the context of that 'findViewById' call?

CODE:.................

View 2 Replies View Related

Android :: What Is The Significance Of Context In Various Constructor Of Intent Class When Starting An Activity

Mar 4, 2010

I had come across a code snippet which calls for an activity without referring to any context. Before, i was considering that context is used to tell about the calling component. But as i came see that another component can be called without any reference to context, it makes me wonder what purpose it might be serving. please put some light on it.

Here is the code which calls for an activity without referring to 'context'

CODE:............................

View 1 Replies View Related

Android :: Know What Functions To Call When Programming Droid Features?

Jul 31, 2010

Basically, I don't know what functions & XML attributes to provide when programming a specific Android feature; eg, Android Search Widget with Edittext in the middle, magnifier glass on the right, and a custom icon on the left.

From where I can find out what methods, parameters & XML attributes to call when doing a specific Android task?

Fron what sources can we find out how to program specific Android feature? Are there some overall programming pictures to reference?

View 1 Replies View Related

HTC EVO 4G :: Wired Earbud , Lost All Call Functions With Droid 2.2 / Get Back?

Aug 16, 2010

Using a Wired Earbud, it has a button to end the call. When starting a call you click the earbud button and you can say "call, Joe Smith". With the upgrade to Android 2.2 it only turns on & off the music and I lost all call functions. How can I get the call functions back?

View 2 Replies View Related

Android :: How Can I Pass A Context Object To A Thread On Call?

May 12, 2010

I have this code fragment: Code...

View 3 Replies View Related

Android :: Why Doesn't Context.bindService() Call OnStartCommand()?

Oct 22, 2010

Here is what the SDK doc says about the bindService():

"Clients can also use Context.bindService() to obtain a persistent connection to a service. This likewise creates the service if it is not already running (calling onCreate() while doing so), but does not call onStartCommand()."

This means that the Service creation lifecyle events are different depending on whether or not the service is created out of startService() or bindService(). Why such difference?

View 6 Replies View Related

Android :: Call Java Class Methods To Other Java Class File On Android

Nov 3, 2010

i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class

package org.me.intent_testing;
import android.app.Activity; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;

/** * * @author pavankumar */

public class FirstActivity extends Activity {................

View 1 Replies View Related

Android :: Way To Call Another Class Method?

Aug 28, 2009

You need a reference to the class that contains the method you want to call. To access the method homepage() inside the eSkyGuide from the class Weather, you need an instance of the eSkyGuide class inside the instance of the Weather class.

View 4 Replies View Related

Android :: Call An Object Of Another Class?

Aug 2, 2010

I have a main class which has edittext box. And i have another class in the same source folder. Now i want to use the text typed in main class accessible to the another class.

View 1 Replies View Related

Android :: Call TextToSpeech In Your Class - Not In Activity

Aug 16, 2010

I wrote successfully TTS with some references in Activity.

However, I want to call this TTS in my own class as below.

CODE:............

View 3 Replies View Related

Android :: Way To Call A Method Of Class Kept Under Other Package?

Oct 5, 2010

I am a beginner in Android Developing. Can any1 please guide me how to call a Method of a class kept under other package. Like class A in Package 1 calls a method in Class B of Package 2 which returns An array or object. Do i have to create an Intent for that? actually i have to gather all information in 1 class from different classes kept under different packages.

View 2 Replies View Related

Android :: Call One Activity From Dialog Class?

Mar 12, 2010

How to can call one activity from Dialog.

View 3 Replies View Related

Android :: Call A Value Entered In A UI To Your Java Class?

Jan 23, 2010

Making a simple app for my android.

in my xml interface there is a text box in which the user will input a number (for example: 10). the id of this text box is "input1"

how do I call the value of input1 in Java and then perform a calculation on it?

For example...

suppose input1 = x

x + 5 or x*2

and for that matter, how do I have the resulting value appear as constantly updated text output in a specified place on the UI?

View 2 Replies View Related

Android : How Would You Call A Method From All Instances Of A Class?

Sep 18, 2010

I am writing a basic game engine and have an abstract class that represents any object that can be drawn in the 3D world, however inside this class is an abstract method Render() which I would like called automatically by the engine on each draw phase.

How could I implement this so that every class extending from my abstract class will automatically have Render() called? I am using java, android sdk 2.2, and opengl es

View 4 Replies View Related

Android : How Can I Call A Bitmap Defined In A Method Of Another Class?

Nov 19, 2010

I want to call a bitmap from a method in my main class and am unsure how to do it - I have a method: Code...

So basically, how can I place the bitmap in my detectFaces method in my main class and pass it as a bitmap on my imageview in my false class?

View 2 Replies View Related

Android :: Call Non Static Method (Located In Main Class) From Different One

Oct 18, 2010

I've been trying to call a non-static method, located in my main application Class, from the Preferences Class. Because the method I call is not static, I instantiate the main class and then try to call the specific method I want but it's force closing.

Preferences.class (from where I call the method):
Preference sorted = (Preference) findPreference("sortPref");
sorted.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
Object d = new Dmarks();
((Dmarks) d).queryBookmarks();
return true;
}});
the Dmarks.class method I call:
public void queryBookmarks() {
Toast.makeText(context, Toast.LENGTH_LONG).show();
//context is not null and the Toast is working if I call it from Dmarks.class }

The Logcat:
E/AndroidRuntime(11718): FATAL EXCEPTION: main
E/AndroidRuntime(11718): java.lang.NullPointerException
E/AndroidRuntime(11718):
at android.content.ContextWrapper.getContentReso
lver(ContextWrapper.java:90)
E/AndroidRuntime(11718):
at android.app.Activity.managedQuery(Activity.ja
va:1520)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Dmarks.queryBookmarks(
Dmarks.java:101)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Preferences$2.onPrefer
enceChange(Preferences.java:47)
E/AndroidRuntime(11718):
at android.preference.Preference.callChangeListe
ner(Preference.java:756)
E/AndroidRuntime(11718):
at android.preference.ListPreference.onDialogClo
sed(ListPreference.java:219)
E/AndroidRuntime(11718):
at android.preference.DialogPreference.onDismiss
(DialogPreference.java:384)
E/AndroidRuntime(11718):
at android.app.Dialog$ListenersHandler.handleMes
sage(Dialog.java:1047)
E/AndroidRuntime(11718):
at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime(11718):
at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(11718):
at android.app.ActivityThread.main(ActivityThrea
d.java:4627)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invoke(Method.java:5
21)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:626)
E/AndroidRuntime(11718):
at dalvik.system.NativeStart.main(Native Method)
D/dalvikvm(11718): GC_FOR_MALLOC freed 4248 objects / 282248 bytes in 40ms
W/ActivityManager( 244): Force finishing activity com.droidil.droidmarks/.Preferences

View 5 Replies View Related

Android :: Service Unable To Call Java Class Methods / Way To Fix?

Jun 22, 2010

Hi, custom classes which are part of a framework, so nothing graphical. One of those (singleton) classes is a Logging class which send logs to my server. I noticed that even though I can call the classes methods in my service it actually won't be logging anything... In my specific example it's osmething like : Logger.getInstance().log("Whatever I want to Log"); Obviously the getInstance is a static method so it can be accessed from anywhere within my project right away.. I was wondering though why this method for example isn't getting called ? Also how do I debug a Service ? Btw I am using of IPC from one of my Activities which gets bound to the service and can start/stop the music for example...

View 9 Replies View Related

Android :: Call AsyncTask Methods From Another Class - Service - Callbacks?

Jun 1, 2010

I was wondering if it's possible to call specific methods defined within the AsynTask class from another class and/or service ?

In my specific case I have a Service playing some sounds, but the sound is selected from a List with available sounds...

When a sounds is selected it is downloaded from my home server, this takes some time (not much, let's say around the 3-4 seconds, the sounds/effects aren't big in size)...

So my problem at the moment is that I have a service to play those sounds, and when I select one I wanted to show a progressdialog... The way (if I understood correctly) is to use an AsyncTask, but the only thing the AsyncTask will do is telling my Service to play a specific sound from my server... So there is no "callback" from the service to the Asynctask...

How can I call a running AsyncTask, which sits in another class, and tell him all work is done and thus he can stop showing the ProgressDialog ? Or am I over-engineering it and there are other ways ?

View 2 Replies View Related

Android : Program Crashes When I Call A Class From Another Java File

Oct 26, 2010

I am new at android development and java programming, but I have decided to program a drinking game app in android. This app basically simulates a deck a cards, a player clicks a button to draw a card then based on the card thats drawn the player plays a drinking game (ie takes 1 drink, takes 2 drinks ect).

I have the main program in one java file, and the code that shuffles the card deck and puts the card sequence in an array in other java file. My problem is that whenever a class from the other java file (classicMode.java) is called from the main program (fubar.java), my android program crashes and gives the error : "The application Drinking Game - FUBAR (process com.games.dg) has stopped unexpectedly. Please try again". Code...

View 1 Replies View Related

Android :: Call Method In Main Activity From Custom View Class

Aug 8, 2010

I am using the following method in a new application I'm developing. There is a main activity, which instantiates different classes that extends RelativeLayout and I'm using setContentView to switch between the different modules of the application. I wonder if this is a good approach or necessarily I have to use different activities to the several screens the app haves.

View 1 Replies View Related

Android :: Java Reflection To Call Higher API Level Function / Abstract Class

Jul 6, 2010

My point is to be able to call a 2.1 API if it exists, while the application should be able to run in 1.5
Specifically, I am making a GPS application which would like to call android.location.LocationManager.addNmeaListener if available. My problem is that this call takes as parameter an abstract class (GpsStatus.NmeaListener) which I cannot pass directly to Class.GetMethod (or my application won't work in 1.5). What I am currently trying is a) to create a wrapper class for GpsStatus.NmeaListener:......................

View 2 Replies View Related

Call SetSearch Function From UrlBuilder Class?

Apr 26, 2014

I am trying to call the setSearch function from UrlBuilder Class, but for some reason I get an error asking me to set my class as static. That's not what I want to do with this class.

[HIGH]package com.KarneeKarnay.gamefinder;

import android.os.Bundle;
import android.app.Activity;
import android.view.KeyEvent;[code]....

View 3 Replies View Related

App Crash Every Time Try To Call Constructor Code From Map Class

Oct 10, 2013

I'm developing an app that uses google maps, but for some reason it crashed every time I try to call the constructor code from the map class.

main
[HIGH]import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {

[Code] ......

View 2 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved