/*
Program to reverse a word or sentence ending with . using recursion
*/
import java.io.*;
class reverseWord
{
static BufferedReader br = new BufferedReader(new
InputStreamReader(System.in));
public static void main(String args[]) throws IOException
{
reverseWord call = new reverseWord();
System.out.print("Enter characters & . to end : ");
call.print();
}
void print() throws IOException
{
char c = (char)br.read();
if(c!=.)
{
print();
System.out.print(c);
}
}
}


/**
* ALGORITHM :
* ---------
* 1. Start
* 2. Accept a sentence from user with full-stop(.) at the end.
* 3. Using recursion, print the sentence in reverse order.
* 4. End
*/

/*
OUTPUT :
------
Enter characters & . to end : stressed.
desserts
*/

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Simple echo application for how to use android AudioTrack and AudioRecord classes
Download Source
Step 1
    Create MainActivity class for audio record and play

package com.javaorigin.audio;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
 AudioManager am = null;
 AudioRecord record =null;
 AudioTrack track =null;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  setVolumeControlStream(AudioManager.MODE_IN_COMMUNICATION);
  init();
  (new Thread() {
   @Override
   public void run() {
    recordAndPlay();
   }
  }).start();
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 private void init() {
  int min = AudioRecord.getMinBufferSize(8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
  record = new AudioRecord(MediaRecorder.AudioSource.VOICE_COMMUNICATION, 8000, AudioFormat.CHANNEL_IN_MONO,
    AudioFormat.ENCODING_PCM_16BIT, min);

  int maxJitter = AudioTrack.getMinBufferSize(8000, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);
  track = new AudioTrack(AudioManager.MODE_IN_COMMUNICATION, 8000, AudioFormat.CHANNEL_OUT_MONO,
    AudioFormat.ENCODING_PCM_16BIT, maxJitter, AudioTrack.MODE_STREAM);
 }

 private void recordAndPlay() {
  short[] lin = new short[1024];
  int num = 0;
  am = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
  am.setMode(AudioManager.MODE_IN_COMMUNICATION);
  record.startRecording();
  track.play();
  while (true) {
   num = record.read(lin, 0, 1024);
   track.write(lin, 0, num);
  }
 }
 
 boolean isSpeaker = false;

 public void modeChange(View view) {
  Button modeBtn=(Button) findViewById(R.id.modeBtn);
  if (isSpeaker == true) {   
   am.setSpeakerphoneOn(false);
   isSpeaker = false;
   modeBtn.setText("Call Mode");
  } else {   
   am.setSpeakerphoneOn(true);
   isSpeaker = true;
   modeBtn.setText("Speaker Mode");
  }
 }
    
 boolean isPlaying=true;
 public void play(View view){
  Button playBtn=(Button) findViewById(R.id.playBtn);
  if(isPlaying){
   record.stop();
   track.pause();
   isPlaying=false;
   playBtn.setText("Play");
  }else{
   record.startRecording();
   track.play();
   isPlaying=true;
   playBtn.setText("Pause");
  }
 }
 
}

Step 2
        Add Button for Play/Pause and Call mode/ Speaker mode

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >



    <Button
        android:id="@+id/modeBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="24dp"
        android:text="Call Mode" 
        android:onClick="modeChange"/>

    <Button
        android:id="@+id/playBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/modeBtn"
        android:layout_alignBottom="@+id/modeBtn"
        android:layout_marginLeft="30dp"
        android:layout_toRightOf="@+id/modeBtn"
        android:onClick="play"
        android:text="Pause" />

</RelativeLayout>

Step 3
    Add audio related permission to Android.xml

    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"></uses-permission>
    <uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>

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The C++ code for a circular permutation.   The code was compiled with CodeBlocks and above is the code and the output.

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Raspberry Pi: The Unofficial Tutorial, By Christian Cawley, http://www.makeuseof.com

Get to know the world’s favorite $25 computer: the Raspberry Pi. You’ll find tips, tricks and more in this unofficial Raspberry Pi tutorial from MakeUseOf. Whether you’re a current Pi owner who wants to learn more or a potential owner of this credit-card size device, this isn’t a guide you want to miss.

Table Of Contents

• §1 – The Raspberry Pi
• §2 – What’s Inside the Raspberry Pi?
• §3 – What You Will Need for Your Raspberry Pi
• §4 – Setting Up the Raspberry Pi
• §5 – Getting to Grips with the GUI
• §6 – Programming on the Pi
• §7 – Configuring the Raspberry Pi as a Media Centre
• §8 – Fascinating Uses for the Raspberry Pi
• §9 – Raspberry Pi: A Versatile Mini Computer
• §10 – The Cream on Your Raspberry Pi

Download Link: http://www.makeuseof.com/pages/great-things-small-package-your-unofficial-raspberry-pi-manual

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The previous exercise "Blur bitmap using Convolution". By changing the matrix of Convolution class, we can use it to sharpen bitmap.

 class Convolution {

  // matrix to sharpen image
  int[][] matrix = { { 0, -1, 0 }, { -1, 5, -1 }, { 0, -1, 0 } };
  ...

---

more: Something about processing images in Android

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Description:

This example shows you can use your own typeface font and use into your application.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it TypefaceExample.
2.) Write following code into res/layout.main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">
    <TextView

       android:id="@+id/CustomFontText"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:textSize="30sp"
       android:text="Typeface Activity!!!! This is font Typeface example">
        </TextView>
</LinearLayout>

3.) Create a fonts folder into assets directory and put your font file i.e. “.otf” file there.

4.) Run for output.

Steps:

1.) Create a project named TypefaceExample and set the information as stated in the image.

Build Target: Android 2.1
Application Name: TypefaceExample
Package Name: com.org.typefaceexample
Activity Name: TypefacActivity
Min SDK Version: 7

2.) Open TypefaceActivity.java file and write following code there:

package com.org.typefaceexample;
import org.pack.R;
import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.widget.TextView;

public class TypefaceActivity extends Activity {
        @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Typeface tf = Typeface.createFromAsset(getAssets(),
                "fonts/File.otf");
        TextView tv = (TextView) findViewById(R.id.CustomFontText);
        tv.setTypeface(tf);
    }
}

3.) Compile and build the project.

Output

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