Android :: Cannot Make Static Reference To Anon-static Method

Feb 7, 2010

I'm having some issues with the old "Cannot make a static reference to a non-static method" error in my Android program. I am creating a sand falling game (similar to the Powder Game) and I created a class called Control to create a Control Bar at the bottom of the screen with a slider for brush size (that works fine) and a button to pop up a Dialog to allow users to pick the selected element. However, when I call DemoActivity.showDialog(2) from my code, it gives the static reference to non-static error (DemoActivity is the main activity of my application). I also tried changing it to just Activity.showDialog(2), but I got exactly the same error!

Here's my code:

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

I fixed it by adding the following to my Control.java code:

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

And then calling control.setActivity(this); from my onResume section of DemoActivity.java!

Android :: Cannot make static reference to anon-static method


Android :: Call Non Static Method In Static SQLiteDatabase Class

Mar 30, 2010

i want to display a msg to the user (msg box or Toast) when exception happend in a static SQLite Database class that i use. the problem is that i cant call a non static method in a static class , how can i handle this. this is the class

private static SQLiteDatabase getDatabase(Context aContext) {

and i want to add something like this in the class when exception happen but context generates the problem of reference to non static in static class.

Context context = getApplicationContext();
CharSequence text = "Hello toast!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();

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Android :: Non-static Method Cannot Be Referenced From A Static Context

May 26, 2010

I am modifying the source code here: http://thinkandroid.wordpress.com/2009/12/30/getting-response-body-of-httpresponse/

I get this error:

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

This error is line 13 on the second box.

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Android :: Static Method In Java Accept Only Final Or Non Final Variables Within Its Method - But Not Static

Sep 15, 2010

Why should a static method in java accept only final or non final variables within its method, but not static?

For example I have the following method:

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

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Android :: Get Shared Preferences / Static Reference To A Context Object

Oct 19, 2010

In my Android application, I have to call the getSharedPreferences in non-activity classes. In order to avoid passing a Context object to each constructor of these classes (and because many of them are classes with only static methods which don't have a constructor), I have implemented these steps : The main activity of my application (which is launched at startup) is called Dispatcher. In the onCreate method of this class, I keep a reference to the created Dispatcher object in a static public variable of the Dispatcher class which can be accessed from any class in the project.

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Replace Single Row View In Custom STATIC ListView - STATIC Data

Mar 18, 2013

I have Eclipse Juno and I'm working on an app with that.

The main activity will have a scrollable menu that takes you to all the other activities.

So the general structure/outline right now:[HIGH]Relative Layout ImageView (header logo type thing) ListView (the actual scrollable menu)[/HIGH]Here's the problem though... I can't find any simple list tutorials. I can easily make a single line list work but I need to make a two line list and one that is static, not dynamic and no examples are out there for that. It's like if you want to make a 2 line list, you can only learn how to do it in the most code-heavy ridiculous way possible.

Essentially what I am looking for with the list is this: Item one: Centred, bold, non selectable title (Resources)

- Item two-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.

- Item ??: Centred, bold, non selectable title (Tools)

- Item ??-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.

Nothing dynamic that is ever going to change, no super complex wonkey calculations, just to simply have the data set in stone (preferably via XML) and to call it into the list.

I experimented with some of the other list views and no matter what I did, I could get, via editing the resources and NOT using Java, more that one item on a single line but it wouldn't format it properly according to the layout I guess because I haven't got the ID correct or whatever I don't know.

I mean, all the examples I've seen for a 2 line list are extraordinarily over-coded and just bloated. I mean I have a website I am still working on in C#/ASP.net that has far more complex things in it with half the code that I've seen for the examples of the two line lists.

I tried on my own to figure it out (I am decent with C# and vaguely familiar with Java, self taught, and programming for some other systems like Python, again all self-taught), but like ALL coding references, they're organised by the actual code you implement (that you don't know) instead of by what you want it to do (so you have to search the whole code base to find something that you don't know what it's called but know what it does). >:C

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Android :: Use Static CreateBitmap Method?

Jun 23, 2009

My application crashes after I try to use the static Bitmap createBitmap method to get a mutable bitmap in order to fill it later with data.

If I only create one 1024x1024 the application works just fine, but when I try to load the same image more than once (first making my object null in each round) my application crashes on my third or fourth try.

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

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Android :: Get An Application Context Into A Static Method

May 7, 2010

I'm working on an Android application that has several Activities. In it I have a class with several static methods. I would like to be able to call these methods from the different Activities. I'm using the static methods to load data from an xml file via a XmlResourceParser. To create a XmlResourceParser requires a call on the Application Context. So my question is, what is the best way to get a reference to the Application Context into the static methods? Have each Activity get it and pass it in? Store it somehow in a global variable?

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Android :: How To Access Preferences In Static Method

Aug 21, 2010

I have a broadcast receiver that needs to notify a service that it has received a text message. The only way to do this (as far as I know) is a static method. But the method that is notified need access to the application's preferences.

Every method I have tried says that it cannot be accessed from a static method. So how do I access preferences from a static method?

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Android :: Calling A Non-static Java Method From C

Dec 22, 2009

In my Android app, I need to call a non static java method from C/C++. But i get a blunt crash when i do it using GetMethodID/CallVoidMethod()1 methods.

I have done like this:

1. Register the method using GetMethodID() as follows (mine is a cpp file): jmethodID xyz = (env)->GetMethodID( cls, "showxyz", "()V");

2. And I call this method as follows: env->CallVoidMethod(cls, xyz);

3. In java, my showxyz() is defined this way(this basically enables a button which was disabled) void showxyz() {findViewById(R.id.btnPass).setEnabled(true);}

And this crashes.

But I have been using this method of calling Java funcs from C using a set of GetStaticMethodID/CallStaticVoidMethod()(for nonstatic methods) and that works always.

But in this case, I have to call a non-static method and i get a crash.

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Android :: GetString(R.string In Static Method

Sep 29, 2010

When programming for Android sometimes you have to use static methods. But when you try to acces you resources in a static method with getString(R.string.text) you'll get an error. Making it static doesn't works. Does anyone knows a good way around this because the resource files in Android are very helpfull for creating things in different languages or making changes to a text.

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Android :: Every Second HttpsUrlConnection Request Of My Static Method Fails

Nov 24, 2010

I'm having a big issue with a static HTTPS connection method. Every second request fails and HttpsUrlConnection.getResponseCode() returns -1. So every second call works well, returning data as expected.

It's the method of a static class I'm using in different corners of my application. I would guess there is anything I don't clean up correctly when the method returns the first time and that whatever causes a problem might get destroyed through a second call of the method. But I'm having a hard time finding any clues.

I'm currently using this class to talk to hosts with invalid SSL certificates. Not going to use this in the final version of the app, but right now I need to save money. ;)

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

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Android :: Static Vs Non-static Inner Classes

Mar 9, 2009

I have been finding it convenient to extend Handler in many of my activities to handle messages specific to the activity. The handler sublass is an inner class of the activity and needs to access its state. I am wondering if there is any performance difference between making the handler subclass static and passing in the activity explicitly in its constructor or making the subclass an "instance class" and letting the vm worry about my accessing members of the containing activity.

The static approach:

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

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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

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Android :: Why Should A Variable In Static Method Be Declared As Final In Java

Sep 15, 2010

I am having a static method .In the method when I decalare a variable , it was showing an error in eclipse saying that the variable should be decalared as final.

Can I know the reason for this , y should a variable in a static method be declared as final? I am writng an Android application where I should pass as an argument current Context of that application. So, when I pass the current context to the method and trying to copy it in a local variable , I am getting this error saying that the variable should be declared as final.

My method is like this:

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

Error is showing at line where Context myctx=ctx; is declared and asking me to declare it as final.

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Android :: Static Method Calls To Derived Types Over Virtual Implementations?

Jul 8, 2010

I have class A, with methods foo and bar, that are implemented by A1 and A2. The functionality in both A1 and A2 is the same. In other words:
public class A {
public int foo() { return 0; };
public int bar() { return 1; };
} class A1 extends A {
public int AnotherFooFunction() { return foo();
} public int AnotherBarFunction() { return bar();
} } class A2 extends A {
public int AnotherFooFunction() { return foo();
} public int AnotherBarFunction() { return bar();
} }

Is it better to keep the code in this fashion, or to swap out those virtual methods as static methods? (In Java, everything non-final/non-private is considered virtual, right?) According to the Designing for Performance section in the Android Developer Docs, I should swap out these virtual methods for static ones. So the above becomes:
public class A {
public int foo() { return 0; };
public int bar() { return 1; };
} class A1 extends A {
public int AnotherFooFunction() { return A.foo();
} public int AnotherBarFunction() { return A.bar();
} class A2 extends A {
public int AnotherFooFunction() { return A.foo();
} public int AnotherBarFunction() { return A.bar();
} }

Is this how it "ought" to be? I fully realize that I may be misinterpreting this paragraph in the docs.

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Android :: BackupManager DataChanged() Not Static , Need Reference To BackupManager?

Sep 12, 2010

From: http://developer.android.com/guide/topics/data/backup.html

To inform the BackupManager that the data has changed, you are supposed to call dataChanged(). However, that method is not static, so you need a reference to the BackupManager. How do you get a reference to the BackupManager?

I can get around this by calling the dataChanged(packageName) method which is static, like this: BackupManager.dataChanged(getBaseContext().getPackageName()); which works great. I'm just wondering if I've missed something?

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Android :: How Would I Make A Web Viewer With A Static Image?

Aug 8, 2010

I am interested in making an application that does various things, but I am having trouble getting a static image, such as an avatar off of a web page.

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Android :: Android - Safe To Create Static Method To Return Application Instance?

Sep 3, 2010

I am thinking to create a static method to return a reference to the application instance. I am not sure if it is safe to assume there is only one instance of the Application in one application. Apparently, the Application class in Android SDK doesn't provide such method to return the instance reference. So I suspect there must be a reason?

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Android :: Make Droid Library For Static Linking That Includes Resources?

Mar 7, 2010

I am successfully linking some of my code stored in a .jar-based library to my Android app. The .jar code references Android library content just fine.

The problem is I need to include 'res' resources in the library but can't work out how to do this. Any suggestions?

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Android :: Static Way To Get Context

Jan 4, 2010

Is there a way to get the current Context instance by using a static method? I'm looking for that way because i hate saving the context instance each time it changes.

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Android :: Static Compilation

Sep 11, 2009

I was working on Freescale iMX31 board, I ported android and it was working fine , but when it came to integration of WiFi & Bluetooth, android forum recommended me to do static compilation for porting over android !

Can I know why some drivers have to be statically compiled before it is ported over android? It was not the case with other drivers which when integrated with android, they worked perfectly well like serial port, usb etc..

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Android :: Is The Static Safe ?

Jul 29, 2009

I use a single static class in my code that defines a static field which I'm reusing between Activity onStop/onStart invocations. Here's a scenario:

User clicks on "Authorize" button (static data is initialized) Activity is stopped and web browser is called
Browser executes callback and Activity is restored (static data is reused)

At least one of my users reports the failure at step 3 which I cannot reproduce but which looks like reset of static data.

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Android :: App Static Storage ?

Sep 30, 2010

I am creating an Android application which will have some embedded music inside of it ( ~ 80 MB ). I was planning on putting it in the res/raw folder.

Since android stores that all in it's internal memory, is this way too large? What are my options? I have come up with the following:

Copy resources out of internal storage and onto the SD card when application first starts. Afterwards remove from internal storage (is this possible?)
Download music from the web when the application first starts.

I would really prefer not to have to go with option 2 since I want the app to be entirely offline and the static music is not going to change (except between releases).

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Android :: Mic Audio Capture Too Static

Jun 3, 2009

As a first step toward a speech recognition project, we wrote a simple voice recording application based on the information in this thread:
http://groups.google.com/group/android-developers/browse_thread/threa...

It is working; however, the audio is extremely poor too static for our needs. As a comparison, we did a similar audio file captured with audacity on a PC and it was much better. Has anyone been able to record high quality audio with the android dev phone? According to the documentation of MediaRecorder, there is only one audio encoder "AMR (Narrowband) audio codec" and three output formats--3gpp, mpeg, and raw AMR:
http://developer.android.com/reference/android/media/MediaRecorder.html

According to wikipedia, AMR encoding is only 8hz. Is there a better option available perhaps a lower-level API compared to MediaRecorder? We are testing on Windows XP, with a Logitec USB microphone, eclipse ganymede, and we are using all the defaults for an android 1.5 app (no emulator command-line options. We defined the SD card in AVD manager).

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Android :: The Life Cycle Of Static

Mar 7, 2010

When starting a new Activity, I want to pass a complex object and do so by using this approach:

MyActivity.COMPLEX_OBJ = myComplexObj; // which is definitely NOT NULL! Intent intent = new Intent(); intent.setClass(this, MyActivity.class); startActivity(intent);

and then in MyActivity:

@Override public void onCreate(Bundle bundle) { if (COMPLEX_OBJ == null) { // report to Flurry ... } ...

}

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Android :: Static Variable Instantiation

Apr 1, 2009

I have noticed in my application(s) that after a call to Activity.finish() that the static variables that I declared in my classes still hold the values that they were changed to during the activity's life cycle. Upon the re-launch of the activity, the program does not re-instantiate the variables as declared or set them to the default java behavior. Is there something that I can do to cause this to happen, other than re-setting every static variable in my application?

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Android :: Static Layout For Whole App That Must In All Activity

Nov 17, 2010

Static Layout for whole app that must be in all Activity

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Android :: Use Of Static Finals In Activity

Sep 8, 2010

Why is the use of static final variables encouraged to declare constants over just final variables? The use of static sounds logical when there will be many instances of a class but is this argument correct when used for a Android activity. In fact, since the Class instance will be around even after the activity finishes and is eventually garbage collected, it seems like all these constants will still be in memory until the class loader is around. Also, does the compiler inline non-static final variables(ints and String) just like it does for static final variables?

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Android :: Static Context Access

Feb 15, 2010

I'm trying to handle exceptions at a global level. My understanding is that the only way to do this is with an UncaughtExceptionHandler. However, this reduces one to the primitive java file and network i/o packages. I'd like to be able to broadcast an intent or bind to a service. Is there some way to interact with the android packages to retrieve a context in a static manner? I could probably do some hack workaround with a thread local, weak-referenced context set at the time of the exception handler, but I'd rather avoid that nastiness.

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