Android :: Arrays To Be Accessed By Both JAVA & JNI In Android App
Oct 23, 2009
I am facing a problem in my Android app which is calling native functions through JNI. So thought somebody in this group can help me to resolve this. The current code :
1. Create an array in JNI layer ( by NewIntArray()) which can be used by both Java & C.
2.we can name that array as type jintArray array.
3.We call GetIntArrayElements() on this array to get its elements i.e, int * elementsX.
4. This elements would be used by a native call which will set it to some value.(project specific* : may not need interest for this issue)
5. We now get the updated value of elements. And copy it back to array using ReleaseIntArrayElements()
6.We use array in bitmap/canvas class of Java layer to display on screen. The whole procedure is followed for (480x640) times. And so there is a redundant creation of the array for every frame display. Is there any way to avoid this creation of array for each frame. Any better solution to achieve the above? I am not getting a way out of this & the performance of my app has gotten very low too Any JNI code snippets to modify steps (1 to 3 & 5) would be of great help to me.
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May 5, 2010
How to create arrays of class instances in JAVA. code...
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Dec 13, 2009
Does anybody know of a work around for the android xml file string array inability to process string <item>'s that are not legal java variable names If not, is this not a major bug? Why does an item in an array need to generate a reference id anyway? Isn't this redundant?
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Jul 28, 2009
Im currently developing a system where the user will end up having large arrays( using android). However the JVM memory is at risk of running out, so in order to prevent this I was thinking of creating a temporary database and store the data in there. However, one of the concerns that comes to me is the SDcard limited by read and write. Also another problem that comes to mind is the overhead of such an operation. Can anyone clear up my concerns, as well as also suggest a possibly good alternative to handling large arrays ( in the end these arrays will be uploaded to a website by writing a csv file and uploading it).
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Oct 28, 2009
I want to get an array of strings reading from arrays.xml file we add in android values/ folder. Could any one kindly give a solution for this. Otherwise I will have to input each these entries in strings.xml and take them to java code using getResources()getString()
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Nov 18, 2010
I have a variable on my "SharedPreferences", that is accessed by two different threads, one in a service, and one in a activity.
There is a easy way to protect this variable to be accessed by two threads at once?code...
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Dec 3, 2009
Reading values like integers, strings, colors, etc. from resources (xml files) is easy and well defined at http://developer.android.com/guide/topics/resources/available-resourc.... But what about a float value, like 0.1 or 1.4? How can such float value be defined in resource file and accessed from code? Is it possible at all?
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Sep 7, 2010
Can an Android APK archive be imported into another Android project and accessed the same way as a JAR archive can?
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Jun 10, 2010
Hey Can anyone tel me how to use arrays in Android.I need to add the numbers given by the user
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Sep 29, 2010
I am trying to create a information based application, I have 92 subjects, for these subjects I have 92 map locations and maybe as much as 400 url links. Currently I have created a class for each map location and a class for each url link, but this would mean I would have in excess of 500 classes, so what I want to do is split the subjects in four catergories ie. listview of about 23 in four tabs which I have done and create a class that gets the url based on the selection the use makes and do the same for the map locations.Do I need to put these in a xml using the id method and how do you call individual entries, i.e. would I need 500 Android:id is there an easier way?
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Mar 16, 2010
I am just trying to display a list from an array that I have in my arrays.xml. When I try to run it in the emulator, I get a force close message. If I define the array in the java file (String[] testArray = "one","two","three","etc";) it works, but when I use "String[] testArray = getResources().getStringArray (R.array.testArray); " it doesnt work.Here is my Java file:package com.xtensivearts.episode.seven;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;public class Episode7 extends ListActivity { String[] testArray = getResources().getStringArray(R.array.testArray); /** Called when the activity is first created. */
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Jul 22, 2009
Arrays.copyOfRange() is unavailable in Android, so I'm wondering what the preferred method of copying arrays is. Manually over a loop, or System.arraycopy()? Also, what was the reason behind the decision to not include Arrays.* ?
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May 12, 2010
I've had my Desire for about a month and a half now, but have been having problems with my SD Card, which seem to be getting worse. Intermittently I get a message saying something along the lines of 'the backup can't complete as the SD card cannot be accessed'. I also sometimes experience the problem trying to snap a photo, only to be told that there is no SD card (which of course is really annoying). When this happens I can still see the card using the ES File Explorer, including seeing the contents, but if I try to open a file (e.g. a photo) I can't view it.
I have searched the forums/the Internet and the general recommendation seems to be to reformat the card which helps for some people. Someone also suggested the SDMount widget to remount the card when it happens. I've tried using two different cards (the included 4GB card + a 16GB Sandisk card), reformatted both several times, but I still get the problem. I ran a memory card test tool on the 16GB card and couldn't find a problem. The only way I've found to get access back is to unmount the card and then restart the phone. Does this mean my phone is faulty, or could it be some software causing the problem?
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Oct 10, 2010
I have the superuser installed on my phone and the droid 2 method one click said i was successfully rooted, however when i go to use a root access required app it wont let me, any ideas why and how to fix it?
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Jan 1, 2010
I would like to create a list objects called Product (Listproducts).In the application I first have to create the list List products from XML file and then display the products on the map. One product can be located at several locations.Does anyone know what is the most appropriate way to create the structure (a list or linked list) which is the easiest to iterate through and enables to link the lists? The logic should work the following way:
1. Read each point from the list
2. Check which product belongs to the point
3. Display the product informations on the map
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Sep 6, 2010
My app has large vertex arrays that are pre-computed before I even build the app for distribution. I'd like to store these in assets (recognizing the size limits of asset files) and read them in with minimal computation. Can I store them in binary, and just read them into an NIO buffer, and then wrap it for GL, or do I have to go through the whole compute intensive (?) process of reading it in, making a byte array, and converting that to an integer (in this case) array?
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Oct 10, 2010
I recently created a program that gets medi-large amounts of xml data and converts it into arrays of Strings, then displays the data.The program works great, but it freezes when it is making the arrays (for around 16 seconds depending on the size).Is there any way I can optimize my program (Alternatives to string arrays etc.)
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Nov 14, 2010
With the stock pic on the eris is there a way to have pics that are sent to you in a saved location that can only be accessed by a code etc?
Basically, the degrading pics your bros send you. Wife, rightfully so, gets upset when she sees them in my phone and does occasionally look at my phone to cure her bouts of insecurity
I want to have it so if you look at pics you see certain ones but have to go extra steps to see the others.
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Jul 26, 2010
I am using a simple expandable list that is populated by two arrays ( group array for the groups and a multi dimensional children array for the child). The arrays are built dynamically in the program and some group items have more children than others. So I end up defining the highest number as the array size for the multidimensional child array. After populating the child array, some positions are left null, as there are no values for those group items (explained above). When I associate this with the expandable list adapter, the getChildView method throws a nullpointer exception when it comes across a position in child array that does noto have value. I have two questions:
1. Can I make the base adapter skip the shildview method if the value in that child is null? The current implementation of getchildView method has to return a view and even if I suppress the nullpointer exception, it adds a blank element in the child position in the list.
2. Is there a better way of associated multidimensional arrays that are populated at run time? The current set of examples only use hardcoded string array values. Even the cursor adapters examples use very basic setup.
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Apr 4, 2010
I simply need to add floatArray1 to floatArray2 storing the result in floatArray2.. no third array. all arrays are one dimensional but are very large. probibly as large as the os will let me get away with. Max i would need is two float arrays with 40,000 floats each. but i could get away with 1/10th that i suppose minimum.Would love to do this in 1/30th or 1/60th of a second but that does not seem possible? Also if the code is JNI,NDK or OpenGL ES thats fine. does android have an assembly language or like machine code i could use somehow?
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May 24, 2010
I am a newb to Android and Java and want to write a funtion that will display a list based on a varable that I pass to the function. The function is below and the code below creates an array out of a string called type, but what I want to do is pass it a variable string and have it build a list based on that string. So if I wanted the type list I would say list_it("type")But if I try something like getResources().getStringArray (R.array.thelist); it doesn't work.Can someone point me in the right direction? public void list_it(String thelist){String[] types = getResources().getStringArray(R.array.type); ArrayAdapter<String> mAdapter = new ArrayAdapter<String>(this, R.layout.list_item1, types);
setListAdapter(mAdapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
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Dec 11, 2009
I'm trying to write an array of objects that implement Parcelable into a Parcel using writeParcelableArray.The objects I'm trying to write are defined (as you'd expect) as:public class Arrival implements Parcelable {All the right stuff in here this class compiles and acts fine And I'm trying to write them into a `Parcel' with: @Override public void writeToParcel(Parcel dest, int flags) I completely don't understand this error message. Parcelable is an interface (not a class) so you can't extend it. Anyone have any ideas? UPDATE: I'm having basically the same problem when putting an ArrayList of Parcelables into an Intent:Intent i = new Intent();i.putParcelableArrayListExtra("locations", (ArrayList< Location> ) locations);Yields: The method putParcelableArrayListExtra(String, ArrayList< ? extends Parcelable >) in the type Intent is not applicable for the arguments (String, ArrayList< Location >)This may be because Location was the class I was working on above (that wraps the Arrivals), but I don't think so.
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Feb 7, 2013
In terms of efficiency, is it better to use arrays programmatically or through calls to xml files.
I'd prefer to use xmls for organisational reasons, but is there much of a performance hit.
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Oct 16, 2010
I have a ListView that displays every item in an array called, "Facts_Array". What I would like to do is display the count of the item clicked on.When an item is clicked in the listview, it displays it using Toast. What I would like to change is what the toast displays. I would like it to find the number in which the item comes. If I click on the second item in the list, I want it to display number 2.
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May 19, 2010
i have two files
App.java
Gallery.java
App. java contains frontend buttons and functionalities Gallery.java lists the imagesin the sd card. i want to call Gallery.java in click event in app.java
App.java
package gallery.display;
import android.app.Activity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........
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Mar 16, 2009
I'm trying to call a java method from javascript using addJavascriptInterface(); but seems does not work, it always display "failure"; java code...
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Aug 8, 2009
Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?
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Feb 11, 2009
I'm having some problems porting a Java application to work in Android platform. I detected an incompatibility problem between java sun and Adroid sdk in java.lang.Class. I oberved that: public Field[] getFields() Returns an array containing Field objects describing all fields which are defined. That's array is sorted as attributes are declared in the main Class in sun jdk. For example, next Class is defined as: public class Example { public boolean stop; public int atr1; public String name; ....
}
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Aug 16, 2010
I do an import of the full package name / java file, and if I do a <classname>.<method>, SOMETIMES I can get it to access - other times I get a lot of can't use a static in a non static bunch of talk. I'll admit I'm new to Java, so what do I need to do? Call a class instance first, then call my methods? I'm rather confused by this, as I want to put all of my 'functions' into a FunctionsList.java file, and all of my main Activity (UI) into a MyActivity.java file.
For example:
<MyActivity.java>
import com.example.FunctionsList;
private class MyActivity extends Activity {
FunctionsList.function();
}
9/10 times I get that static/non-static error. If I put all of my functions into MyActivity.java, I have zero problems!
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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..
package org.me.intent_testing;
import android.app.Activity;
import android.os.Bundle;
import android.widget.;
import android.view.;
import android.content.Intent;...........
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