AndroidVoiceMessageView.java

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package org.ros.android.androidVoiceMessage;

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.Paint.Style;
import android.view.SurfaceHolder;
import android.view.SurfaceView;


public class AndroidVoiceMessageView extends SurfaceView implements
                SurfaceHolder.Callback, Runnable {

        private SurfaceHolder holder;
        private Thread thread;
        private Paint paint;
        private Canvas canvas;
        private int width;
        private float originalY;
        private float scale;

        private ArrayList<Float> volumeArray;

        public AndroidVoiceMessageView(Context context) {
                super(context);
                // initialize
                volumeArray = new ArrayList<Float>();
                width = getWidth();
                originalY = getHeight();
                scale = 3;

                paint = new Paint();
                paint.setStyle(Style.FILL);
                paint.setTextSize(32);
                paint.setTypeface(Typeface.create(Typeface.SERIF, Typeface.BOLD_ITALIC));

        }
        
        public void setView(SurfaceView surfaceView){
                holder = surfaceView.getHolder();
                holder.addCallback(this);
                holder.setFixedSize(480, 262);
        }

        public void surfaceCreated(SurfaceHolder holder) {
                thread = new Thread(this);
                thread.start();
        }

        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
                width = w;

        }

        public void surfaceDestroyed(SurfaceHolder holder) {
                thread = null;
        }

        public void run() {
                while (true) {
                        try {
                                int size = volumeArray.size();
                                canvas = holder.lockCanvas();
                                canvas.drawColor(Color.BLACK);
                                paint.setColor(Color.GRAY);
                                        canvas.drawLine(0, originalY, width, originalY, paint);
                                
                                paint.setColor(Color.WHITE);
                                        for (int i = 0; i < size - 2; i++) {
                                                canvas.drawLine(i*3, volumeArray.get(i)*scale + originalY, (i + 1)*3,
                                                                volumeArray.get(i + 1)*scale + originalY, paint);
                                        }
                        
                                holder.unlockCanvasAndPost(canvas);

                        } catch (Exception e) {

                        }
                }
        }

        public void addValues(float value) {
                volumeArray.add(value);
                if (volumeArray.size() > width/3+1) {
                        volumeArray.remove(0);
                }
        }

}