Eclipse reset/enable workspace preference on startup

Hi all,

Today, I have come across a situation where I want to choose the one of the workspaces i have worked before.

In general, eclipse will prompt for workspace location on startup
But, if you have checked "Consider this as default workspace and don't ask again" option, then next time when you start eclipse, you won't get the prompt for workspace selection.

Re-enable/Reset workspace preference on eclipse startup

1. Click on eclipse "Window->Preferences"
2. Go to "General->Startup/Shutdown->Workspaces"
3. Check "Prompt for workspace on startup" or use keyboard shortcut "Alt+w" 
4. 
5. Now, exit the eclipse
6. Start the eclipse

You should be able to see the workspace selection on eclipse startup screen.

Happy coding!!

Please send your comments and feedback to psrdotcom@gmail.com

PhoneGap Installation and running Sample Application on Windows

Pre-requisites

Softwares

1.       Node.js

2.       Ant (Zip)

3.       Java SDK 1.7

4.       Android SDK

5.       Eclipse (Zip)

6.       Cordova (Zip)

Setup Environment Variables

1.       NODEJS_HOME

2.       ANT_HOME

3.       JAVA_HOME

4.       ANDROID_SDK

5.       CORDOVA_ANDROID

PATH Environment Variable Update

Add NODEJS\bin;ANT_HOME\bin;JAVA_HOME\bin;ANDROID_SDK\tools;ANDROID_SDK\platform-tools

Install phonegap

If you are behind a proxy please set the proxy to npm (Node.js) command

Syntax:-

(HTTP) C:\> npm config set proxy http://proxy.company.com:port

(HTTPS) C:\> npm config set https-proxy http://proxy.company.com:port

Run the install command

C:\> npm install –g phonegap
C:\> npm install –g cordova

Note: If you get any ”shasum (Checksum)” error, then please

i)                    clear the npm and npm-cache directories from %User%/AppData/Roaming folder

ii)                  Install the latest npm version

Currently it is 1.3.21

npm install https://registry.npmjs.org/npm/-/npm-1.3.21.tgz
npm install -g phonegap

Create Project

Syntax: phonegap create

Ex: phonegap create FirstPhnGpPrj com.pg.firstphngpprj PhoneGapPrj1

·         Now it will create some folders and corresponding files (HTML, CSS, JS)

·         Change the directory to your project directory

o   Ex:- C:\> cd FirstPhnGpPrj

Add Platform

Syntax: cordova platform add

Ex:- C:\FirstPhnGpPrj> cordova platform add android

Tip:

If it’s not working then you need to install the cordova (npm install –g cordova)

Copy the cordova-android\bin from your downloaded&extracted zip file to %User%\.cordova\bin

Run Phonegap for Individual Platform

Syntax: phonegap run

Ex:- C:\FirstPhnGpPrj> phonegap run android

1.       By now, you will be getting your Android project hierarchy in your project_folder\platforms\android\

2.       Import the existing android code from your Eclipse

3.       Create\manage AVD

4.       Run the project

Adding Plugins to your project

Pre-requisites

·         Install Git

Tip: If you are behind a proxy then please add it your configuration

Syntax: git config –global http.proxy http://proxyusername:proxypassword@server.company:port

Ex: git config –global http.proxy http://abc:123@xyz.com:8081

·         Add git\bin to your PATH environment variable

·         You need to download the git files from https://git-wip-us.apache.org. So make sure that the above specified URL is not blocked by your firewall

·         Navigate to your project directory in command prompt by changing the directory

cd

Install Plugin

Syntax: phonegap local plugin add

Ex:- phonegap local plugin add https://git-wip-us.apache.org/repos/asf/cordova-plugin-device.git

Tip: If this doesn’t run then try with cordova

Syntax: cordova plugin add

Ex:- cordova plugin add https://git-wip-us.apache.org/repos/asf/cordova-plugin-device.git

Remove Plugin

Syntax: phonegap local plugin remove

Ex:- phonegap local plugin remove https://git-wip-us.apache.org/repos/asf/cordova-plugin-device.git

Tip: If this doesn’t run then try with cordova

Syntax: cordova plugin remove

Ex:- cordova plugin remove https://git-wip-us.apache.org/repos/asf/cordova-plugin-device.git

Alternative

You can install “plugman” to plug and play with plugins by following this link

Using Plugman to Manage Plugins

References

http://phonegap.com/install/

http://jjasonclark.com/how-to-setup-node-behind-web-proxy

http://teusink.blogspot.nl/2013/07/guide-phonegap-3-android-windows.html

http://docs.phonegap.com/en/3.2.0/plugin_ref_plugman.md.html#Using%20Plugman%20to%20Manage%20Plugins

http://docs.phonegap.com/en/3.2.0/cordova_accelerometer_accelerometer.md.html#Accelerometer

Manage/Edit your Runtime Environment in Eclipse EE Version

Hi all,

When you want to change your runtime environment in Eclipse EE version, simply follow these steps

1. Click on “Window” Menu
2. Select “Preferences” option
3. It will open “Preferences” window
4. On the left hand side of the window, you can find different options.
5. Select “Server” and choose “Runtime Environments”
6. Now you can find different runtime environments (if exists)
7. You can add, edit and remove runtime environments

While creating the project you can choose your own customized environment as well.

Happy coding :)

Please send your feedback and queries to psrdotcom@gmail.com

Solved the problem of import project in eclipse

Hi users,

I had been facing this issue for sometime. I didn't concentrate much on this issue. Today finally it got solved.

Problem:
Unable to import projects into eclipse

Solution:

• Remove any projects from the workspace with the same name (Cut and Paste in some folder as backup)
• Check whether you have android-8 (min) in your project properties target platform

Note: You can view the existing projects (closed projects also) in your eclipse by clicking on package explorer

Remove the unused projects, name conflict projects.
Please restart the eclipse (File->Restart)
Now, you will be able to import your projects into eclipse.

Note: Please write your comments (or) mail to psrdotcom@gmail.com

Creating basic Graphical User Interface (GUI) application in java with Screenshots

Hi all,

One of my friend asked me, how to create a basic java GUI application which can run on desktop?

A small java gui desktop application, which is having a button and when user click on it, it will show the status of the application.

Source code:

import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JOptionPane;

public class PSRSampleGUI
public static void main(String[] args) {
       
        // Creating a frame
        JFrame frame_name = new JFrame("PSR");
      
        //Setting the layout to view the content
        frame_name.setLayout(new FlowLayout());
      
        // Sample lable option
        JLabel label_name = new JLabel("Click Start button");
      
        // Creating a button
        JButton button_name = new JButton("Start");
      
        // Adding button to frame
        frame_name.add(label_name);
        frame_name.add(button_name);
      
        // Adding button functionality
        button_name.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent ae)
            {
                JOptionPane.showMessageDialog(null, "Started", "App Status", JOptionPane.INFORMATION_MESSAGE);
                // Call the method here ( the implemented method)
            }
        });
      
        // Displaying the frame in the center of the screen window
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension windowSize = frame_name.getSize();
        int windowX = Math.max(0, (screenSize.width  - windowSize.width ) / 2);
        int windowY = Math.max(0, (screenSize.height - windowSize.height) / 2);
        frame_name.setLocation(windowX,windowY);
      
        // Displaying the Frame with packing all the contents properly
        frame_name.setVisible(true);
        frame_name.pack();
    } // main method ends here
} // class ends here

Screenshots:

• By Running the application, you will get the following window in the center of your screen.

• After clicking on "Start" button, you will get the following window

If you have any queries, please mail to psrdotcom@gmail.com

Android NDK JNI Windows xp/7 with 32/64 bit Installation Problems with Solutions in Eclipse without C/C++ CDT Plugin

Hi all,

I spent 2 days on configuring this. I read lot of blogs and instrutction steps from various sites. I would like share my experience on installing Android NDK and Working with Eclipse.

Objective:
Using JNI Technology in Eclipse with Android NDK r6/r7 on Windows xp/7 Professional

Pre-requirements:

1. Java SE SDK -- Java Development Kit
2. Eclipse Helios/Indigo -- IDE to work with Java, Android, C/C++ etc.
3. Android SDK -- Android Applications Development Kit
4. Android ADT Plugin for Eclipse -- Download the latest Android SDK Platform Tools
5. C/C++ Plugin for Eclipse (Optional) -- Make sure that .c, .cpp, .h files opening from Eclipse
6. Android NDK (r6/r7) -- Native development i.e. Running c libraries in Android
7. Cygwin 1.7.x or above -- Makefile creation, Library file creation tools, Compiling C files

Installation:

1. Install the Java Development Kit
   
2. Install the Android SDK and ADT Plugin with Eclipse
3. [Optional] Install CDT plugin for Eclipse
4. Download and extract the Android NDK
5. Install Cygwin 1.7.x or above

Note: Don't extract in a folder where folder name is having spaces in between words.
Example:
"Program Files" -- Don't Use
"ProgramFiles" -- Use

Configuration:
Please make sure that you have set the environment variables like

• JAVA_HOME -- Java Home Directory
• NDK_HOME -- Android NDK Home Directory
• Update Path Variable with JDK Bin folder

Creating Android Application

• In Eclipse, Select File->New->Android Project

• Enter the Project Name and Click on "Next" button

• Select the "Build Target", I opted for Android 2.2, SDK 8 Version and Click on "Next" button

• In Application Info dialog, enter the "Package Name" and Select "Finish" button

• Now, you can see the newly created SampleNDK project in the eclipse project explorer window

Example:

• Eclipse Workspace Folder: D:\Workspace
• Android Application Name: SampleNDK
• Android Application Working Folder: D:\Workspace\SampleNDK
• Package Name: com.samplendk
• Android Application Source Folder: D:\Workspace\SampleNDK\src

Source of AndroidNDKActivity.java

package com.samplendk;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;

public class SampleNDKActivity extends Activity {
   
    //Declare the native method
    private native String invokeNativeFunction();
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //Call the native methods
        String hello = invokeNativeFunction();
        new AlertDialog.Builder(this).setMessage(hello).show();
    }
   
}

• Create a folder named "jni" in the project

• Right click on the "SampleNDK" project-> Select "New"-> Select "Folder"->Type "jni"

• Create files "Android.mk" and "native.c" in Jni folder

• Right click on the "jni" folder-> Select "New"-> Select "File"->Type "Android.mk"
• Right click on the "jni" folder-> Select "New"-> Select "File"->Type "native.c"

• After Creating those folder and files, the project explorer window look like this

• Do some continuous steps.

• Build, Refresh, and Clean project

• Right Click on the "SampleNDK" project and Select the "Build Project"

• Select "Sample NDK" project and Click "F5" button on keyboard

• Select "Project" menu and Select "Clean" option

• Create header file of the java file

• In windows command prompt, change to project source directory

• Syntax:

• cmd>

• cmd> cd ProjectDir/src

• Example:

• cmd> D:

• D:\> cd SampleNDK/src

• Run the Javah command to create header file

• Syntax:

• cmd> javah -jni .javafile_without_.java_extension // JDK 1.7

• cmd> javah -classpath ..\bin\classes .javafile_without_.java_extension //JDK1.6

• Example:

• D:\SampleNDK\src> javah -jni com.samplendk.SampleNDKActivity //JDK1.7

• D:\SampleNDK\src> javah -classpath ..\bin\classes com.samplendk.SampleNDKActivity //JDK1.6

• Note:

• Don't include the .java at the end of javah command

• Copy the created java header file to jni folder

• D:\SampleNDK\src> copy com_samplendk_SampleNDKActivity.h ..\jni

• Go to Eclipse and Refresh the project by pressing "F5" on keyboard.

• Open the header file from jni folder

• Copy the function created by javah as shown below

• Paste the code in native.c and change the code similar to this

Source of native.c

#include <string.h>
#include "com_samplendk_SampleNDKActivity.h"

jstring JNICALL Java_com_samplendk_SampleNDKActivity_invokeNativeFunction
  (JNIEnv *env, jobject obj)
{
    return (*env)->NewStringUTF(env, "Hello from native function !!");
}

Source of Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Here we give our module name and source file(s)
LOCAL_MODULE := SampleNDK
LOCAL_SRC_FILES := native.c

include $(BUILD_SHARED_LIBRARY)

• Run Cygwin.bat file in the Cygwin installed directory

• It will open the cygwin command prompt

• Change the directory to SampleNDK project directory

• Note: All the drives in your systems are mounted to some directory in the cygwin.

• To see your drive mount points type mount

• # mount

• # cd /cygdrive/d/SampleNDK/

• Run the ndk-build command from the android ndk directory

• # /cygdrive/d/android-ndk-r7/ndk-build

• Error(Only in Android-ndk-r7):

• You may get some error like the following

• /awk.exe: can't open file check-awk.awk

• Andoid NDK: Host 'awk' tool is outdated. Please define

• HOST-Awk to Point to Gawk or Nawk !

• Resolution:

• Goto the android-ndk/prebuilt/windows/bin/

• Change the awk.exe to awk_.exe

• Now you may see the following output after successful execution

• After successful creating libSampleNDK.so file, refresh your Eclipse project

• You can see the updated "Project Explorer" with "libs" folder in the tree hierarchy

• Update the java source code now by adding this library to it

Source code of SampleNDKActivity.java

package com.samplendk;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;

public class SampleNDKActivity extends Activity {
   
    static
    {
        System.loadLibrary("SampleNDK");
    }
   
    //Declare the native method
    private native String invokeNativeFunction();
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //Call the native methods
        String hello = invokeNativeFunction();
        new AlertDialog.Builder(this).setMessage(hello).show();
    }
   
}

• Clean the project by Selecting "Project"->"Clean"

• Run the application as "Android Application"

• Note:

• Error:

• java.lang.unsatisfiedLinkError Library -- not found

• Resolution:

• Please see if you have added the "lib" in java source before adding the library in System.loadLibrary() method
• Please find the screenshot of above running program in emulator

If you have queries, please mail to psrdotcom@gmail.com

Eclipse C C++ CDT Plugin Download and Installation with Link or Location Problem Solution

Hi all,

If you are using Eclipse with Java or any other platform and you are planning to install the C/C++(CDT) Plugin then please follow the steps.

Installation Steps:

• In Eclipse, Click the Help->"Install New Software"
• You will get a Install named window
• Click "Add" button
• Enter the name as "CDT Plugin" [Without Double quotes " "]
• Location as "http://download.eclipse.org/tools/cdt/releases/(Your Eclipse Version)" [Without Double quotes " "] 
• Example: http://download.eclipse.org/tools/cdt/releases/indigo 
• You can find your suitable Eclipse link from this http://www.eclipse.org/cdt/downloads.php 
• Common Error: While copying from the CDT Download page, we usually copies the entire path from the webpage including the dot(.) which they provided. 
• http://download.eclipse.org/tools/cdt/releases/indigo. -- Incorrect Location 
• http://download.eclipse.org/tools/cdt/releases/indigo -- Correct Location
• Please remove the dot(.) at the end while adding the CDT Plugin location from the link.
• In "Install" Window, "Work with" textbox, please type the CDT and you will prompted with different options, Select the desired option and click/hit "Enter/Return" button.
• It will show the similar kind of screen as shown below

• You can select the all/desired tools to download
• Please "Restart Eclipse" to complete the CDT Plugin installation for Eclipse
• Now you can develop your C/C++ applications with Eclipse

Happy Coding ..


For further queries, please mail to psrdotcom@gmail.com