JNI Development in Linux(Ubuntu) command line

for JNI (Java Native Interface)  development we need two languages

1)Java
2)C or C++

Step 1:Open terminal(Ctrl+Alt+T) first next create java file

Prompt@vamsi:~$vi VamsiJni.java

public class VamsiJni{

             static{
                           System.loadLibrary("sum");
                      }
             public native int sum(int  a, int b);
             public static void main(String[] args){
            
           
                    VamsiJni vjni= new VamsiJni();
            System.out.println("sum of two numbers is ...."+vjni.sum(10,45));

}//main is closed 

}//class is closed

Save program

Step 2: Compile java program

Prompt@vamsi:~$javac VamsiJni.java

Now our directory having VamsiJni.class file (This is called Byte file)

Step 3: For generating header file

Prompt@vamsi:~$javah -jni VamsiJni

Now our directory having VamsiJni.h file (This is C Header file for communicating jni syntax)

Step 4: now create c source file

Before creation source file once open header file copy prototype function name

Prompt@vamsi:~$vi sum.c


#include<stdio.h>
#include"VamsiJni.h"
#include<jni.h>

JNIEXPORT jint JNICALL Java_VamsiJni_sum
  (JNIEnv * env, jobject object, jint a, jint b){

        printf("This is sum function inside C");
        return a+b;

}

first save C program

Step 5:now our job is creation shared library using C source code

Prompt@vamsi:~$gcc -I /usr/lib/jvm/java-1.6.0-openjdk/include/ -shared -o libsum.so  sum.c

Now our directory having sum.so

Step 6: now executing java program

Prompt@vamsi:~$java -Djava.library.path=. VamsiJni

Now our output is:

sum of two numbers is ....55
This is sum function inside C

Find out cell tower Location using Android API

How to find out cell tower Location in Android pragmatically?

The following code will show the your cell tower location showing

        LocationManager locationmanager;

        String context=Context.LOCATION_SERVICE;

        locationmanager=(LocationManager) getSystemService(context);

        String provider=LocationManager.NETWORK_PROVIDER;

        Location location= locationmanager.getLastKnownLocation(provider);

        String latitude=location.getLatitude();

        String longitude=location.getLongitude()

CUSTOMIZED TOAST MESSAGE

Toast toast=new Toast(this);
ImageView view =new ImageView(this);
view.setImageResources(R.drawable.icon);
toast.setview(view);
toast.show();

copy following icon in drawable folder with name warn.jpg format[project/res/drawable]

Now it will show following screen but it not showing animations.