Namaste Android

Faster Android Emulator Configuration

Android Emulator Configuration

Android Emulator Output

Android API

API Reference:
http://developer.android.com/reference/android/app/Activity.html

Different approaches for setting up Android Development Environment

There are several options to prepare Android Development environment in Eclipse.

A) First Approach:
i) Install Eclipse and add ADT (Android Development Tool) plugin to it.
ii) Install Android SDK and configure it in Eclipse
Please Refere to : Installation of Android Development Tools (ADT)

B) Second Approach:
i) Download ADT Bundle (Android SDK + Eclipse) from below URL,
http://developer.android.com/sdk/installing/index.html

ii) Unzip the bundle and start Eclipse
[n this approach ADT is already available and not need to install any ADT plugin like (A) above]

How to import existing Android Project into the Eclipse

1) From Eclipse menu select (File/Import)

2) Select an import source to (Android/Existing Android Code Into Workspace)

3) Select project to be imported by select the top level project directory

What is adb (Android Debug Bridge) ?

Android Debug Bridge (adb) is a command line tool that allows to communicate with emulator instance or real connected handset.

# Using GridView in Android Application

Add GridView on the activity layout which will automatically adds XML GridView object in the related xml layout as shown below

Create Activity layout : layout/results.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="#FF234499"

android:orientation="vertical" >

<GridView

android:id="@+id/resultsGrid"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:numColumns="5"

android:background="#FF234499">

</GridView>

</LinearLayout>

Create Adapter which is responsible for creating cells on the GUI

public class TextAdapter extends BaseAdapter{

private Context c;

private String[] list;

public TextAdapter(Context ctx) {

this.c = ctx;

list = new String[50];

for (int i = 0; i < list.length; i++) {

list[i] = "Cell #" + i;

}

public int getCount() {

return list.length;

}

public Object getItem(int arg0) {

return null;

}

public long getItemId(int arg0) {

return 0;

}

public View getView(int position, View convertView, ViewGroup parent) {

final int p = position;

TextView txtView = new TextView(c);

if (position % 2 == 0) {

txtView.setBackgroundColor(Color.BLACK);

} else {

txtView.setBackgroundColor(Color.WHITE);

}

//onclick enablement

txtView.setOnClickListener(new View.OnClickListener() {

public void onClick(View arg0) {

System.out.println("Postion clicked : " + p);

}

});

txtView.setText(list[position]);

return txtView;

}

Create linkage between GridView and application code by adding below code

public class ResultsActivity extends Activity implements View.OnClickListener {

@Override

protected void onCreate(Bundle savedInstanceState) {

//grid view

GridView resultsGrid = (GridView) findViewById(R.id.resultsGrid);

resultsGrid.setAdapter(new TextAdapter(this));

}

#P2 Capital quiz on Android platform

Project Background

Develop a Quiz application to Display Country name and four capital options (out of one is correct). User could tap on any of the four options to select correct capital. Next question will be displayed once user selects correct answer.

Output

Project Structure in the Eclipse

Source code

package com.myapps.model;

/**

* Model to hold information about each question and related four answer options,

* out of which one is correct.

* @author Santosh Lawoo

* @version 1.2

*/

public class Question {

           private int index;

           private String description;

           private String answer;

           private String[] options;





           public int getIndex() {

                      return index;

           }

           public void setIndex(int index) {

                      this.index = index;

           }

           public String getDescription() {

                      return description;

           }

           public void setDescription(String description) {

                      this.description = description;

           }

           public String getAnswer() {

                      return answer;

           }

           public void setAnswer(String answer) {

                      this.answer = answer;

           }

           public String[] getOptions() {

                      return options;

           }

           public void setOptions(String[] options) {

                      this.options = options;

           }

}

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