how do i declare URL variables
i tried this, but the "URL"s are marked as errors
Code:
URL url = new URL("URL.goes.here.com");
URL cannot be resolved to a type, is what eclipse tells me
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I have a preferences.xml that looks like this:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference android:name="Sample" android:enabled="true"
android:persistent="true" android:summary="Sample" android:defaultValue="3.0"
android:title="Sample" android:key="sample" /> </PreferenceScreen>
When I do sp.getString("sample", "3.0"), it works fine and returns a string, but it shouldn't be a string, it should be a float. Running sp.getFloat("sample", 3.0f) throws a ClassCastException because it is a string. What should I put in the XML so that the preference is stored as a float?
I have a doubt
For using Phone contact we have to set permission in manifest file
<uses-permission android:name="android.permission.READ_CONTACTS" /> <uses-permission android:name="android.permission.WRITE_CONTACTS" />
My doubt is where(in which file) it is written in Contact Application that you have to set these permissions. because i want to make a sample application and i want if anyone want to get data from my application, have to get some permission.
Please let me know that where we plan which permission has to get by other application to get data from a application.
I have a little doubt, I spend data from Activity A to B with a bundle in the intent.Where I should declare the keys? In Activity A or B? Only to avoid confusion, I'm talking about the string that defines the data that will be set in the Bundle.Ex: public static final String KEY = "MyKey";
I declare always in the Activity A, but I think that if I could let all the keys in a file would be better, like keys.java or something like that.Obviously, this is nothing that is generating errors, just a doubt about convention, a thing that I consider very important in software development.
How is declare global variable in android...some link send me...am searched various post..but am not clear about dis concept...send me valuable link..
View 3 Replies View RelatedI was wondering if anyone could give me hints on this one (i am re-posting an older version of a question i once had): i created a new attrs.xml that adds some functionality to the soft keyboard sample code.. code...
View 2 Replies View RelatedIn my thread I create an inner activity 'B' at one point in order to launch another activity for result. I need to declare this in my Android manifest file but can not work out what the name of it is as the standard ".B" does not work as it says that activity does not exist. How can I declare this activity?
View 1 Replies View RelatedI am trying to implement search in my application.
My application contain 4 activities and I want to add the search dialog only on 3 of them while only one of them (ProductsActivity) will be the default context.
unfortunately while I activate the search I keep getting the following error:
"Key android.app.default_searchable expected String but value was a java.lang.Integer. The default value was returned." code...
How do I declare an Android UI element using XML?
View 1 Replies View RelatedA few days ago I was struggling to find a way to use custom intents for my alarms. Although I got clear answer that I have to customize the Intents based on some unique ID eg. setAction() still have some problems.This can happen more than once for a contact. And when the second message is generated, the notification is raised well (message is fine there) but the intent when the user actions the notification it uses old data, so previous message is passed and not the brand new message.So someway the intent is caching and reusing previous extras. How can I make it unique per contact and per action?
View 3 Replies View RelatedCan anyone hep me with how to make a (boolean) variable global in Android?
View 2 Replies View RelatedI split my inner View class from my Main class into its own file. In my main class, I have the view set as an onTouchListener which records user movement into a matrix so it can translate and scale the view. After separating it everything works but im unsure how to pass the matrix to the View for onDraw to update. Any suggestions?
View 1 Replies View RelatedIn android, are using static variables a recommended practice?
E.g, implementing a Singleton pattern in Java, I usually do...
Also, when does this get cleaned up by the Android JVM?
Before I delve into it, I'm very new to Android and I have just started learning Java last month. I've hit bumps while trying to develop my first simple app. Most of these hurdles were jumped thanks to random tutorials online. MY CODE IS VERY MESSY. Any tips are appreciated.
The question above is quite broad, but this is what I want to do: It's a essentially a blood alcohol content calculator / drink keeper-tracker. Basic layout: http://i.imgur.com/JGuh7.jpg
The buttons along the bottom are just regular buttons, not ImageButtons (had problems with that) Here's some example code ..
It outputs the following to the text view: "Your BAC is -0.017". This is the Bac value for if StandardDrinks was still 0, so obviously there is some problem communicating between the classes.
The other elements of the formula (weight, time spent drinking, and the alcohol %'s and such) are variables because I will ultimately allow the user to change those values in the settings.
I've heard around the water cooler that global variables are not good programming style, but this is the closest I've come to getting it to work..
how can I pass variables from service to activity and vice versa?
View 1 Replies View RelatedI'm trying to encrypt a text with DES algorithm using Bouncy Castle library. I have written the following code:
Code:
try{
KeyGenerator kg=KeyGenerator.getInstance("DES");
SecretKey key=kg.generateKey();
[Code]....
Then depending on the user selection, inputText is encrypted or encText is decrypted in the switch statement. Both encryption and decryption blocks share the same "keySpec" and "Cipher" variables generated in the above code snippet. However, the compiler says that keySpec and Cipher cannot be resolved which I understand is that the keySpec and Cipher generated cannot be seen by the statements inside the switch blocks. How can I make it work?
I just ran into a situation where it looks like a static variable reference is persisted across activity sessions. I didn't expect that because I thought that when an activity exits, it's de-referenced and garbage collected. I am wondering if anyone can shed some (more) light on when the VM eliminates object references for Activities and Services and in particular when static variables get reset to default values?
View 7 Replies View RelatedHow can I make a variable or object available to multiple activities or restarts of the same one.
View 1 Replies View RelatedI am using static Arrays and HashMaps to store some values in my AppWidgetProvider class. But they are becoming null when the process dies, so the widget does not work anymore. Are there any alternatives to using static members to store data for an AppWidgetProvider in Android?
View 5 Replies View RelatedIn android: I'm trying to take data from one activity/screen to another.
Let's say I'm adding two numbers. I layout my first screen (xml) with 2 EditText views, a couple labels, and an 'OK' button. Now, I want to add the numbers that I've input into the EditText views. Let's say I input 2 and 2 (2 + 2 = 4).
Now, when I hit the 'OK' button, I want a new screen/activity to appear and simply show me the answer (4). Do I use global vars to do this?
I am starting to develop an Android App and have noticed the following behaviour in my test code (not yet designed the real app):
A thread that loops around doing Bluetooth IO accesses an instance variable that is declared in the enclosing class. That instance variable gets set to null by the GUI thread in the onBackPressed() method which also closes the Bluetooth socket which causes an exception in the IO thread (which is what I want).
The odd thing is that if I set the instance variable to null before I close the socket, the IO thread sees the null value, but if I close the socket first and then set the variable to null, the IO thread doesn't see the null value.
The instance variable is being used in a loop in the IO thread and it appears as if that variable is being cached while within the loop. So any changes to that variable by another thread are not visible. Is that possible? If so, is there a workaround to guarantee that the VM will read the value of the instance variable?
I would like to use self defined Environment variables in my source code.
I use System.getenv() to do this and the code line looks like this. Log.d("MyTest","== MyEnv " + System.getenv("AP") + " ANDROID_ASSETS:" + System.getenv("ANDROID_ASSETS"));
Before I execute my code I define my AP variable with export: export AP="12345" and the this is my output of set command
ANDROID_ASSETS=/system/app
ANDROID_BOOTLOGO=1
ANDROID_DATA=/data
ANDROID_PROPERTY_WORKSPACE=9,32768
ANDROID_ROOT=/system
AP=12345
Then I execute my code and I get this line from logcat
D/MyTest( 5363): == MyEnv null ANDROID_ASSETS:/system/app
The value for my defined Environment variable is null. Any suggestions on why it didn't work?
I'm building an Android application and would like to maintain a few environment variables that I can tweak depending on whether I'm in development mode or release mode. For example, I need to invoke a web service and the URL will be slightly different in either mode. I'd like to externalize this and other settings so I can change them easily based on my target deployment. Distinguishing development mode and release mode environment settings on Android. Are there any best practices or anything in the SDK to assist with this need?
View 3 Replies View RelatedI have been facing problems to manage statics variables used in my android application. If we exit the application against a particular event (touch or key event -which is must for my app), all the statics variables are retaining the values when I am launching it again. I am invoking Activity.finish() method for termination . I know there is a collection type class available called Bundle and we can use it to save the states of all the statics and get those back when again creating the same activity during relaunch, but it would be a hard task if we want to port some j2me applications to Android because of having thousands of statics variables. Is there any way to kill the application completely including all the statics variable used there?
I tried with System.exit(0) and it works well for Android G1 and G2 (tested in firmware 1.6). But in Android Robyn (prototype) the same causes a major defect ("Activity not responding" popup apears just after exit) and I came to know from android dev forum that calling System.exit(0) is not recommended for termination of an activity.
I have an application that is driven by a configuration XML: various app properties are loaded at the app start-time by parsing the XML and initializing static variables of some class. The data read from this XML drives different Activities of the application. Presently, I have called the "parsing and the properties-initialization" from the onCreate() of my Main Activity. I have a few questions as regards this case/approach: Should I invoke the app initialization method from the Application Object or is the current approach correct?
What advantages/disadvantages do/would we get/have if I choose to invoke it from the Application object? Do we really need a static class to store app properties? Or can we have all the properties as a static Collection variable in the application object? Parsing a XML(~200 nodes) at app load time might take some time (not sure how long tho); How can I avoid the dreaded ANRs? I am using a Pull Parser.
Is there any reason not to use the Application class to share variables across Activities? For instance a handle to the DB or a single HttpClient.
View 2 Replies View RelatedI want to know if there is a way to pass environment variables to the running process in Android. If yes, how should one set those environment variables.
View 4 Replies View RelatedI'm kinda noob to android so please bear with me. I'm currently developing app which uses tabs. My question now is: how to store values of variables so I can access them on the other tabs? I want to create something similar to sessions in PHP where I can save variables on one page and access on the other.
View 4 Replies View RelatedI have installed ADB and the whole Android SDK to root my asus transformer infinity (tf700t). I have taken all the steps every forum on the web describes: installing everything trough the manager, adjusting the path in the System Variables, and finally it getting it to work together with my tablet. However, when I try to flash/copy/install files from my folder (yes these files are in the same folder as adb.exe and fastboot.exe, which is the folder I used in the System Variables) It can't either find these files or it cannot open these files. When i put in the command 'path' however. I does give me the path where the files can be found.
View 1 Replies View RelatedI'm sharing some variables accross activities by using a class like this :
CODE:..........
Then I'm using these variables anywhere across my multiple activites with ...if (Globals.hint2_stockview_valuation == false) {....}
Pretty basic and it was working fine untill ...
I introduced some webview stuff like this:
CODE:...........
And here's the News_Webview.class:
CODE:............
The problem now is that, when it "comes back" from this Activity, it looks like my Globals variables have disappeared ?
if (Globals.hint2_stockview_valuation == false) {
fires an error :
06-23 12:14:03.443:
ERROR/AndroidRuntime(2611): Caused by:
java.lang.NullPointerException
2 Questions then:
Should I use something else than this "Global" class to share variables across activities ? Is it just bad practice to do this ?? I know that I can use the preferences but I thought it was quicker to do it this way (no need to "read" the preferences everytime I start a new activity ...Should I "get back" my savedInstanceState in some way when my activity returns from the News_Webview.class ?