Develop Reference

find the brightest pixel in the camera preview

need a help to fix these line of code to find brightest pixel and its coordinates (x,y) and draw a bitmap over it.
i have android preview live camera and want to scan the screen my process code is within onPreviewFframe by doing for loop and comparing preset float brightestValue to every value of pixels[]. my canvas staticaly draw circle in top left of the screen.
i expect dinamic change of circle position on the camera surfaceview while change the direction of the camera. sorry if my english is bad grammatically
thank you
public class CameraDemo extends Activity {
private static final String TAG = "CameraDemo";
Preview preview;
int brightestX = 0; // X-coordinate of the brightest video pixel
int brightestY = 0; // Y-coordinate of the brightest video pixel
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Paint p = new Paint ();
p.setColor(Color.WHITE);
Bitmap bg = Bitmap.createBitmap(480,800,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bg);
canvas.drawCircle(brightestX,brightestY,20,p);
preview = new Preview(this);
preview.setBackground(new BitmapDrawable(bg));
((FrameLayout) findViewById(R.id.preview)).addView(preview);
}
class Preview extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback {
SurfaceHolder mHolder;
Camera mCamera;
private Camera.Parameters parameters;
private Camera.Size previewSize;
private int[] pixels;
Preview(Context context) {
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.startPreview();
mCamera.setPreviewDisplay(holder);
mCamera.setDisplayOrientation(90);
mCamera.setPreviewCallbackWithBuffer(this);
parameters = mCamera.getParameters();
previewSize = parameters.getPreviewSize();
} catch (IOException exception) {
mCamera.release();
mCamera = null;
// TODO: add more exception handling logic here
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.release();
mCamera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
parameters.setPreviewSize(w, h);
//set the camera's settings
mCamera.setParameters(parameters);
mCamera.startPreview();
}
#Override
public void onPreviewFrame(byte[] data, Camera camera) {
//transforms NV21 pixel data into RGB pixels
decodeYUV420SP(pixels, data, previewSize.width, previewSize.height);
float brightestValue = 0; // Brightness of the brightest video pixel
for (int y = 0; y < previewSize.height ; y++) {
for (int x = 0; x < previewSize.width; x++) {
// Get the color stored in the pixel
float pixelBrightness = pixels[previewSize.width*previewSize.height];
// If that value is brighter than any previous, then store the
// brightness of that pixel, as well as its (x,y) location
if (pixelBrightness > brightestValue) {
brightestValue = pixelBrightness;
brightestY = y;
brightestX = x;
}
}
}
}
}
//Method from Ketai project! Not mine! See below...
void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) { int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0)
y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143)
r = 262143;
if (g < 0) g = 0; else if (g > 262143)
g = 262143;
if (b < 0) b = 0; else if (b > 262143)
b = 262143;
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
}
}
}
}

You need to call canvas.drawCircle(brightestX,brightestY,20,p); after updating the position in the onPreviewFrame method, so the code looks like this:
if (pixelBrightness > brightestValue) {
brightestValue = pixelBrightness;
brightestY = y;
brightestX = x;
drawCircleOnNewPosition() // method that calls canvas.drawCircle
}

How to Apply Color LUT to bitmap images for filter effects in android?

here i have a question on LUTs in android.
my question is, i have 4X4 LUTs, Using these LUTs apply filter effect for bitmap image in android. Below is my sample LUT file link.
Lut link sample
Is it Possible in android? if possible please help me how to apply.
Thanks in advance.

I'm working on a LUT applier library which eases the use of LUT images in Android. It uses the algorythm below, but I'd like to enhance it in the future for optimising memory usage. Now it also guesses the color axes of the LUT:
https://github.com/dntks/easyLUT/wiki
Your LUT image has the red-green-blue color dimension in an other order than what I've been used to, so I had to change the order of when getting the lutIndex (at getLutIndex()).
Please check my edited answer:
final static int X_DEPTH = 16;
final static int Y_DEPTH = 16; //One little square has 16x16 pixels in it
final static int ROW_DEPTH = 4;
final static int COLUMN_DEPTH = 4; // the image consists of 4x4 little squares
final static int COLOR_DISTORTION = 16; // 256*256*256 => 256 no distortion, 64*64*64 => 256 dividied by 4 = 64, 16x16x16 => 256 dividied by 16 = 16
private Bitmap applyLutToBitmap(Bitmap src, Bitmap lutBitmap) {
int lutWidth = lutBitmap.getWidth();
int lutColors[] = new int[lutWidth * lutBitmap.getHeight()];
lutBitmap.getPixels(lutColors, 0, lutWidth, 0, 0, lutWidth, lutBitmap.getHeight());
int mWidth = src.getWidth();
int mHeight = src.getHeight();
int[] pix = new int[mWidth * mHeight];
src.getPixels(pix, 0, mWidth, 0, 0, mWidth, mHeight);
int R, G, B;
for (int y = 0; y < mHeight; y++)
for (int x = 0; x < mWidth; x++) {
int index = y * mWidth + x;
int r = ((pix[index] >> 16) & 0xff) / COLOR_DISTORTION;
int g = ((pix[index] >> 8) & 0xff) / COLOR_DISTORTION;
int b = (pix[index] & 0xff) / COLOR_DISTORTION;
int lutIndex = getLutIndex(lutWidth, r, g, b);
R = ((lutColors[lutIndex] >> 16) & 0xff);
G = ((lutColors[lutIndex] >> 8) & 0xff);
B = ((lutColors[lutIndex]) & 0xff);
pix[index] = 0xff000000 | (R << 16) | (G << 8) | B;
}
Bitmap filteredBitmap = Bitmap.createBitmap(mWidth, mHeight, src.getConfig());
filteredBitmap.setPixels(pix, 0, mWidth, 0, 0, mWidth, mHeight);
return filteredBitmap;
}
//the magic happens here
private int getLutIndex(int lutWidth, int redDepth, int greenDepth, int blueDepth) {
int lutX = (greenDepth % ROW_DEPTH) * X_DEPTH + blueDepth;
int lutY = (greenDepth / COLUMN_DEPTH) * Y_DEPTH + redDepth;
return lutY * lutWidth + lutX;
}

This is how you would process an image with RenderScript's ScriptIntrinsic3DLUT
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsic3DLUT;
import android.renderscript.Type;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
ImageView imageView1;
RenderScript mRs;
Bitmap mBitmap;
Bitmap mLutBitmap;
ScriptIntrinsic3DLUT mScriptlut;
Bitmap mOutputBitmap;
Allocation mAllocIn;
Allocation mAllocOut;
Allocation mAllocCube;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView1 = (ImageView) findViewById(R.id.imageView);
mRs = RenderScript.create(this);
Background background = new Background();
background.execute();
}
class Background extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
if (mRs == null) {
mRs = RenderScript.create(MainActivity.this);
}
if (mBitmap == null) {
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.bugs);
mOutputBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), mBitmap.getConfig());
mAllocIn = Allocation.createFromBitmap(mRs, mBitmap);
mAllocOut = Allocation.createFromBitmap(mRs, mOutputBitmap);
}
if (mLutBitmap == null) {
mLutBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.dawizfe);
int w = mLutBitmap.getWidth();
int h = mLutBitmap.getHeight();
int redDim = w / 4;
int greenDim = h / 4;
int blueDim = 16;
android.renderscript.Type.Builder tb = new Type.Builder(mRs, Element.U8_4(mRs));
tb.setX(redDim);
tb.setY(greenDim);
tb.setZ(blueDim);
Type t = tb.create();
mAllocCube = Allocation.createTyped(mRs, t);
int[] pixels = new int[w * h];
int[] lut = new int[w * h];
mLutBitmap.getPixels(pixels, 0, w, 0, 0, w, h);
int i = 0;
for (int r = 0; r < redDim; r++) {
for (int g = 0; g < greenDim; g++) {
for (int b = 0; b < blueDim; b++) {
int gdown = g / 4;
int gright = g % 4;
lut[i] = pixels[b + r * w + gdown * w * redDim + gright * blueDim];
i++;
}
}
}
// This is an identity 3D LUT
// i = 0;
// for (int r = 0; r < redDim; r++) {
// for (int g = 0; g < greenDim; g++) {
// for (int b = 0; b < blueDim; b++) {
// int bcol = (b * 255) / blueDim;
// int gcol = (g * 255) / greenDim;
// int rcol = (r * 255) / redDim;
// lut[i] = bcol | (gcol << 8) | (rcol << 16);
// i++;
// }
// }
// }
mAllocCube.copyFromUnchecked(lut);
}
if (mScriptlut == null) {
mScriptlut = ScriptIntrinsic3DLUT.create(mRs, Element.U8_4(mRs));
}
mScriptlut.setLUT(mAllocCube);
mScriptlut.forEach(mAllocIn, mAllocOut);
mAllocOut.copyTo(mOutputBitmap);
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
imageView1.setImageBitmap(mOutputBitmap);
}
}
}

u can go through this, hope it will help you to get the right process.
photo is the main bitmap here.
mLut3D is the array of LUT images stored in drawable
RenderScript mRs;
Bitmap mLutBitmap, mBitmap;
ScriptIntrinsic3DLUT mScriptlut;
Bitmap mOutputBitmap;
Allocation mAllocIn;
Allocation mAllocOut;
Allocation mAllocCube;
int mFilter = 0;
mRs = RenderScript.create(yourActivity.this);
public Bitmap filterapply() {
int redDim, greenDim, blueDim;
int w, h;
int[] lut;
if (mScriptlut == null) {
mScriptlut = ScriptIntrinsic3DLUT.create(mRs, Element.U8_4(mRs));
}
if (mBitmap == null) {
mBitmap = photo;
}
mOutputBitmap = Bitmap.createBitmap(mBitmap.getWidth(),
mBitmap.getHeight(), mBitmap.getConfig());
mAllocIn = Allocation.createFromBitmap(mRs, mBitmap);
mAllocOut = Allocation.createFromBitmap(mRs, mOutputBitmap);
// }
mLutBitmap = BitmapFactory.decodeResource(getResources(),
mLut3D[mFilter]);
w = mLutBitmap.getWidth();
h = mLutBitmap.getHeight();
redDim = w / h;
greenDim = redDim;
blueDim = redDim;
int[] pixels = new int[w * h];
lut = new int[w * h];
mLutBitmap.getPixels(pixels, 0, w, 0, 0, w, h);
int i = 0;
for (int r = 0; r < redDim; r++) {
for (int g = 0; g < greenDim; g++) {
int p = r + g * w;
for (int b = 0; b < blueDim; b++) {
lut[i++] = pixels[p + b * h];
}
}
}
Type.Builder tb = new Type.Builder(mRs, Element.U8_4(mRs));
tb.setX(redDim).setY(greenDim).setZ(blueDim);
Type t = tb.create();
mAllocCube = Allocation.createTyped(mRs, t);
mAllocCube.copyFromUnchecked(lut);
mScriptlut.setLUT(mAllocCube);
mScriptlut.forEach(mAllocIn, mAllocOut);
mAllocOut.copyTo(mOutputBitmap);
return mOutputBitmap;
}
you increase the mFilter value to get different filter effect with different LUT images, you have, check it out.
you can go through the this link on github for more help, i got the answer from here:-
https://github.com/RenderScript/RsLutDemo
hope it will help

Preserving red part on Android Camera Preview and other part on screen is Grayscale

I am writing a android app about camera.
The function I want to implement is let preview preserving red color on screen,
the other part on screen be grayscale.
Like this picture
I use the particular scalar multiply R, G and B component to attach grayscale
and preserve red part of preview after changeing raw data format to RGB.
but after I override onDraw(Canvas canvas) method in my custom View,
the result is like blue filter effect
Can anybody give some hint to let me know which step I am wrong.
THANK YOU.
The code of my custom View is below
package com.example.macampreviewdemo;
public class CamPreviewDemoActivity extends Activity {
/** Called when the activity is first created. */
int h, w;
public String tag = "tag";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(tag, "onCreate");
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
h = metrics.heightPixels;
w = metrics.widthPixels;
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
Display display = ((WindowManager)
getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
setContentView(R.layout.main);
setRequestedOrientation(0);
ViewToDraw dtw = (ViewToDraw) findViewById(R.id.vtd);
CameraView cameraView = new CameraView(this, dtw, w, h);
((FrameLayout) findViewById(R.id.preview)).addView(cameraView);
}
}
And this:
package com.example.macampreviewdemo;
public class ViewToDraw extends View{
public String tag = "tag";
public byte[] image;
public boolean isCameraSet = false;
public int imgWidth, imgHeight;
Bitmap overlayBitmap;
Matrix matrix;
public ViewToDraw(Context context, AttributeSet attrs) {
super(context, attrs);
matrix = new Matrix();
}
public void cameraSet(){
isCameraSet = true;
}
public void putImage(byte[] img){
image = img;
}
#Override
protected void onDraw(Canvas canvas){
Log.i(tag, "onDraw() ");
int size = imgWidth * imgHeight;
int[] rgb = new int[imgWidth * imgHeight];
if(isCameraSet){
rgb = convertYUV420_NV21toARGB8888(image, imgWidth, imgHeight);
for (int k = 0; k < size; k++) {
if(Color.red(rgb[k]) == 255 &&
Color.green(rgb[k]) == 0 &&
Color.blue(rgb[k]) == 50){}
else{
rgb[k] = (int) (
(0.2126 * Color.red(rgb[k])) +
(0.7152 * Color.green(rgb[k])) +
(0.0722 * Color.blue(rgb[k]))
);
}
}
Log.i("tag", "rgb length = " + rgb.length);
overlayBitmap =
Bitmap.createBitmap(rgb, 0, imgWidth,
imgWidth, imgHeight,
Bitmap.Config.RGB_565);
canvas.drawBitmap(overlayBitmap, matrix, null);
overlayBitmap.recycle();
}
}
static public void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
int rtmp, gtmp, btmp;
for (int j = 0, yp = 0; j < height; j++) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0)y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0)r = 0;
else if (r > 262143)r = 262143;
if (g < 0)g = 0;
else if (g > 262143)g = 262143;
if (b < 0)b = 0;
else if (b > 262143)b = 262143;
rtmp = ((r << 6) & 0xff0000);
gtmp = ((g >> 2) & 0xff00);
btmp = ((b >> 10) & 0xff);
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00)
| ((b >> 10) & 0xff);
}
}
}
int[] yuv420ToGrayScale(byte[] yuv420, int width, int height){
int size = width * height;
int y1, y2, y3, y4;
int[] pixel = new int[size];
for (int i = 0; i < size; i+=2) {
y1 = yuv420[i]&0xff;;
y2 = yuv420[i + 1]&0xff;;
y3 = yuv420[i + width]&0xff;;
y4 = yuv420[i + width +1]&0xff;;
pixel[i] = yuv420[i];
pixel[i + 1] = yuv420[i +1];
pixel[i + width ] = yuv420[width + i];
pixel[i + width + 1] = yuv420[i + width + 1];
if (i!=0 && (i+2)%width==0)
i+=width;
}
return pixel;
}
/**
* Converts YUV420 NV21 to ARGB8888
*
* #param data byte array on YUV420 NV21 format.
* #param width pixels width
* #param height pixels height
* #return a ARGB8888 pixels int array. Where each int is a pixels ARGB.
*/
public static int[] convertYUV420_NV21toARGB8888(byte [] data, int width, int height) {
int size = width*height;
int offset = size;
int[] pixels = new int[size];
int u, v, y1, y2, y3, y4;
// i along Y and the final pixels
// k along pixels U and V
for(int i=0, k=0; i < size; i+=2, k+=1) {
y1 = data[i ]&0xff;
y2 = data[i+1]&0xff;
y3 = data[width+i ]&0xff;
y4 = data[width+i+1]&0xff;
v = data[offset+k ]&0xff;
u = data[offset+k+1]&0xff;
v = v-128;
u = u-128;
pixels[i ] = convertYUVtoARGB(y1, u, v);
pixels[i+1] = convertYUVtoARGB(y2, u, v);
pixels[width+i ] = convertYUVtoARGB(y3, u, v);
pixels[width+i+1] = convertYUVtoARGB(y4, u, v);
if (i!=0 && (i+2)%width==0)
i+=width;
}
return pixels;
}
private static int convertYUVtoARGB(int y, int u, int v) {
int r,g,b;
r = y + (int)(1.402f*u);
g = y - (int)(0.344f*v + 0.714f*u);
b = y + (int)(1.772f*v);
r = r>255? 255 : r<0 ? 0 : r;
g = g>255? 255 : g<0 ? 0 : g;
b = b>255? 255 : b<0 ? 0 : b;
return 0xff000000 | (r<<16) | (g<<8) | b;
}
public static void myNV21ToRGB(int width, int height){
int yy, u, v;
int frame_size = width * height;
}
}
And this:
package com.example.macampreviewdemo;
public class CameraView extends SurfaceView implements SurfaceHolder.Callback{
public Camera mycamera;
List<Camera.Size> cameraSize;
private SurfaceHolder mHolder;
public ViewToDraw vtd;
int pickedH, pickedW;
int defaultH, defaultW;
public String tag = "tag";
public CameraView(Context context, ViewToDraw _vtd, int width, int height) {
super(context);
// TODO Auto-generated constructor stub
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
vtd = _vtd;
defaultH = height;
defaultW = width;
}
#Override
public void surfaceCreated(SurfaceHolder holder) {
Log.i("tag"," surfaceCreated");
int i;
mycamera = Camera.open();
cameraSize = mycamera.getParameters().getSupportedPreviewSizes();
if(cameraSize != null){
// pick resolution
pickedH = defaultH;
pickedW = defaultW;
for(i=0;i<cameraSize.size();i++){
if(cameraSize.get(i).width < defaultW){
break;
}else{
pickedH = cameraSize.get(i).height;
pickedW = cameraSize.get(i).width;
}
}
}else{
Log.e("tag","null");
};
try {
mycamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.i("tag","surfaceChanged");
Camera.Parameters parameters = mycamera.getParameters();
parameters.setPreviewSize(pickedW, pickedH);
mycamera.setParameters(parameters);
//create buffer
PixelFormat p = new PixelFormat();
PixelFormat.getPixelFormatInfo(parameters.getPreviewFormat(),p);
int bufSize = (pickedW*pickedH*p.bitsPerPixel)/8;
//add buffers
byte[] buffer = new byte[bufSize];
mycamera.addCallbackBuffer(buffer);
buffer = new byte[bufSize];
mycamera.addCallbackBuffer(buffer);
buffer = new byte[bufSize];
mycamera.addCallbackBuffer(buffer);
mycamera.setPreviewCallbackWithBuffer(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
Log.i("tag", "onPreviewFrame");
Log.i("tag", "pickedH = " + pickedH);
Log.i("tag", "pickedW = " + pickedW);
vtd.putImage(data);
vtd.cameraSet();
vtd.imgHeight = pickedH;
vtd.imgWidth = pickedW;
vtd.invalidate();
mycamera.addCallbackBuffer(data);
}
});
mycamera.startPreview();
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i("tag", "surfaceDestroyed");
mycamera.setPreviewCallback(null);
mycamera.release();
mycamera = null;
}
}
And this:
<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=".CamPreviewDemoActivity" >
<FrameLayout android:id="#+id/FrameLayout01"
android:layout_height="fill_parent" android:layout_width="fill_parent">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/preview">
</FrameLayout>
<com.example.macampreviewdemo.ViewToDraw
android:id="#+id/vtd"
android:layout_height="fill_parent"
android:layout_width="fill_parent"/>
</FrameLayout>
</RelativeLayout>

How to print image with text from android phone to Bluetooth printer.?

I want to print some text with image which is reside on my android phone to Bluetooth printer but text is successfully printed and image is not printed on paper.
I using following code:
public class SendingdataActivity extends Activity {
/** Called when the activity is first created. */
private BluetoothAdapter mBluetoothAdapter = null;
static final UUID MY_UUID =
UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
static String address = "50:C3:00:00:00:00";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(this,
"Bluetooth is not available.",
Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mBluetoothAdapter.isEnabled()) {
Toast.makeText(this,
"Please enable your BT and re-run this program.",
Toast.LENGTH_LONG).show();
finish();
return;
}
final SendData sendData = new SendData();
Button sendButton = (Button) findViewById(R.id.send);
sendButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
sendData.sendMessage();
}
});
}
class SendData extends Thread {
private BluetoothDevice device = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
public SendData(){
device = mBluetoothAdapter.getRemoteDevice(address);
try
{
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
}
catch (Exception e) {
// TODO: handle exception
}
mBluetoothAdapter.cancelDiscovery();
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
}
}
Toast.makeText(getBaseContext(), "Connected to " + device.getName(),
Toast.LENGTH_SHORT).show();
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
}
}
public void sendMessage()
{
try {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.white);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100,baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
Toast.makeText(getBaseContext(), String.valueOf(b.length), Toast.LENGTH_SHORT).show();
outStream.write(b);
outStream.flush();
} catch (IOException e) {
}
}
}
}
This code works and print only text on paper.
Thanks.

After long time I am created an app to print image on bluetooth printer by using following steps:
1. Connect your Bluetooth device with Android phone
2. Call senddatatodevice() method when you want to send data on printer
3. code executed within senddatatodevice() is like bellow.
private static void senddatatodevice() {
// TODO Auto-generated method stub
try {
//base64 image string
String sig="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byte[] imageAsBytes = android.util.Base64
.decode(sig, android.util.Base64.DEFAULT);
btMap = BitmapFactory.decodeByteArray(imageAsBytes, 0,
imageAsBytes.length);
Bitmap bitmapOrg = resizeImage(btMap, 384,
150);// Bit
byte[] sendbuf = StartBmpToPrintCode(bitmapOrg, 0);
/*byte[] a=t2.getBytes();
byte[] combined = new byte[a.length + sendbuf.length];
System.arraycopy(a,0,combined,0 ,a.length);
System.arraycopy(sendbuf,0,combined,a.length,sendbuf.length);*/
mbtOutputStream = mbtSocket.getOutputStream();
mbtOutputStream.write(sendbuf);
mbtOutputStream.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Bitmap resizeImage(Bitmap bitmap, int w, int h) {
Bitmap BitmapOrg = bitmap;
int width = BitmapOrg.getWidth();
int height = BitmapOrg.getHeight();
int newWidth = w;
int newHeight = h;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleWidth);
Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 10,10, width,
height, matrix, true);
return resizedBitmap;
}
private static byte[] StartBmpToPrintCode(Bitmap bitmap, int t) {
byte temp = 0;
int j = 7;
int start = 0;
if (bitmap != null) {
int mWidth = bitmap.getWidth();
int mHeight = bitmap.getHeight();
int[] mIntArray = new int[mWidth * mHeight];
byte[] data = new byte[mWidth * mHeight];
bitmap.getPixels(mIntArray, 0, mWidth, 0, 0, mWidth, mHeight);
encodeYUV420SP(data, mIntArray, mWidth, mHeight, t);
byte[] result = new byte[mWidth * mHeight / 8];
for (int i = 0; i < mWidth * mHeight; i++) {
temp = (byte) ((byte) (data[i] << j) + temp);
j--;
if (j < 0) {
j = 7;
}
if (i % 8 == 7) {
result[start++] = temp;
temp = 0;
}
}
if (j != 7) {
result[start++] = temp;
}
int aHeight = 24 - mHeight % 24;
byte[] add = new byte[aHeight * 48];
byte[] nresult = new byte[mWidth * mHeight / 8 + aHeight * 48];
System.arraycopy(result, 0, nresult, 0, result.length);
System.arraycopy(add, 0, nresult, result.length, add.length);
byte[] byteContent = new byte[(mWidth / 8 + 4)
* (mHeight + aHeight)];// ´òÓ¡Êý×é
byte[] bytehead = new byte[4];// ÿÐдòÓ¡Í·
bytehead[0] = (byte) 0x1f;
bytehead[1] = (byte) 0x10;
bytehead[2] = (byte) (mWidth / 8);
bytehead[3] = (byte) 0x00;
for (int index = 0; index < mHeight + aHeight; index++) {
System.arraycopy(bytehead, 0, byteContent, index * 52, 4);
System.arraycopy(nresult, index * 48, byteContent,
index * 52 + 4, 48);
}
return byteContent;
}
return null;
}
public static void encodeYUV420SP(byte[] yuv420sp, int[] rgba, int width,
int height, int t) {
final int frameSize = width * height;
int[] U, V;
U = new int[frameSize];
V = new int[frameSize];
final int uvwidth = width / 2;
int r, g, b, y, u, v;
int bits = 8;
int index = 0;
int f = 0;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
r = (rgba[index] & 0xff000000) >> 24;
g = (rgba[index] & 0xff0000) >> 16;
b = (rgba[index] & 0xff00) >> 8;
// rgb to yuv
y = ((66 * r + 129 * g + 25 * b + 128) >> 8) + 16;
u = ((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128;
v = ((112 * r - 94 * g - 18 * b + 128) >> 8) + 128;
// clip y
// yuv420sp[index++] = (byte) ((y < 0) ? 0 : ((y > 255) ? 255 :
// y));
byte temp = (byte) ((y < 0) ? 0 : ((y > 255) ? 255 : y));
if (t == 0) {
yuv420sp[index++] = temp > 0 ? (byte) 1 : (byte) 0;
} else {
yuv420sp[index++] = temp > 0 ? (byte) 0 : (byte) 1;
}
// {
// if (f == 0) {
// yuv420sp[index++] = 0;
// f = 1;
// } else {
// yuv420sp[index++] = 1;
// f = 0;
// }
// }
}
}
f = 0;
}

How to generate Image Histogram in Android?

I tried to generate histogram of Image using following code,
package com.example.viewfinderee368;
import java.nio.ByteBuffer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
#SuppressLint("DrawAllocation")
public class HistogramDemo extends Activity {
Bitmap mainImage;
Bitmap histroImage;
ImageView mainImageView;
LinearLayout histroImageView;
private DrawOnTop mDrawOnTop;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.histrogram);
mainImageView = (ImageView) findViewById(R.id.img);
histroImageView = (LinearLayout) findViewById(R.id.histroImg);
mainImage = ((BitmapDrawable) mainImageView.getDrawable()).getBitmap();
histroImage = Bitmap.createBitmap(mainImage);
mDrawOnTop = new DrawOnTop(this);
mDrawOnTop.mImageWidth = mainImage.getWidth();
mDrawOnTop.mImageHeight = mainImage.getHeight();
mDrawOnTop.mBitmap = Bitmap.createBitmap(mDrawOnTop.mImageWidth,
mDrawOnTop.mImageHeight, Bitmap.Config.RGB_565);
mDrawOnTop.mRGBData = new int[mDrawOnTop.mImageWidth * mDrawOnTop.mImageHeight];
int bytes = mainImage.getByteCount();
//or we can calculate bytes this way. Use a different value than 4 if you don't use 32bit images.
//int bytes = b.getWidth()*b.getHeight()*4;
ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
mainImage.copyPixelsToBuffer(buffer); //Move the byte data to the buffer
byte[] array = buffer.array();
mDrawOnTop.mYUVData =array;
System.arraycopy(array, 0, mDrawOnTop.mYUVData, 0, array.length);
// mDrawOnTop.invalidate();
histroImageView.addView(mDrawOnTop);
}
class DrawOnTop extends View {
Bitmap mBitmap;
Paint mPaintBlack;
Paint mPaintYellow;
Paint mPaintRed;
Paint mPaintGreen;
Paint mPaintBlue;
Paint mPaintGray;
byte[] mYUVData;
int[] mRGBData;
int mImageWidth, mImageHeight;
int[] mRedHistogram;
int[] mGreenHistogram;
int[] mBlueHistogram;
double[] mBinSquared;
private DrawOnTop(Context context) {
super(context);
mPaintBlack = new Paint();
mPaintBlack.setStyle(Paint.Style.FILL);
mPaintBlack.setColor(Color.BLACK);
mPaintBlack.setTextSize(25);
mPaintYellow = new Paint();
mPaintYellow.setStyle(Paint.Style.FILL);
mPaintYellow.setColor(Color.YELLOW);
mPaintYellow.setTextSize(25);
mPaintRed = new Paint();
mPaintRed.setStyle(Paint.Style.FILL);
mPaintRed.setColor(Color.RED);
mPaintRed.setTextSize(25);
mPaintGreen = new Paint();
mPaintGreen.setStyle(Paint.Style.FILL);
mPaintGreen.setColor(Color.GREEN);
mPaintGreen.setTextSize(25);
mPaintBlue = new Paint();
mPaintBlue.setStyle(Paint.Style.FILL);
mPaintBlue.setColor(Color.BLUE);
mPaintBlue.setTextSize(25);
mPaintGray = new Paint();
mPaintGray.setStyle(Paint.Style.FILL);
mPaintGray.setColor(Color.GRAY);
mPaintGray.setTextSize(25);
mBitmap = null;
mYUVData = null;
mRGBData = null;
mRedHistogram = new int[256];
mGreenHistogram = new int[256];
mBlueHistogram = new int[256];
mBinSquared = new double[256];
for (int bin = 0; bin < 256; bin++)
{
mBinSquared[bin] = ((double)bin) * bin;
} // bin
}
#Override
protected void onDraw(Canvas canvas) {
if (mBitmap != null)
{
canvas.drawColor(Color.WHITE);
int canvasWidth = 255;
int canvasHeight =255;
int newImageWidth = canvasWidth;
int newImageHeight = canvasHeight;
int marginWidth = (canvasWidth - newImageWidth)/2;
// Convert from YUV to RGB
decodeYUV420SP(mRGBData, mYUVData, mImageWidth, mImageHeight);
// Draw bitmap
mBitmap.setPixels(mRGBData, 0, mImageWidth, 0, 0,
mImageWidth, mImageHeight);
// Draw black borders
canvas.drawRect(0, 0, marginWidth, canvasHeight, mPaintBlack);
canvas.drawRect(canvasWidth - marginWidth, 0,
canvasWidth, canvasHeight, mPaintBlack);
// Calculate histogram
calculateIntensityHistogram(mRGBData, mRedHistogram,
mImageWidth, mImageHeight, 0);
calculateIntensityHistogram(mRGBData, mGreenHistogram,
mImageWidth, mImageHeight, 1);
calculateIntensityHistogram(mRGBData, mBlueHistogram,
mImageWidth, mImageHeight, 2);
// Calculate mean
double imageRedMean = 0, imageGreenMean = 0, imageBlueMean = 0;
double redHistogramSum = 0, greenHistogramSum = 0, blueHistogramSum = 0;
for (int bin = 0; bin < 256; bin++)
{
imageRedMean += mRedHistogram[bin] * bin;
redHistogramSum += mRedHistogram[bin];
imageGreenMean += mGreenHistogram[bin] * bin;
greenHistogramSum += mGreenHistogram[bin];
imageBlueMean += mBlueHistogram[bin] * bin;
blueHistogramSum += mBlueHistogram[bin];
} // bin
imageRedMean /= redHistogramSum;
imageGreenMean /= greenHistogramSum;
imageBlueMean /= blueHistogramSum;
// Draw red intensity histogram
float barMaxHeight = 5000;
float barWidth = ((float)newImageWidth) / 256;
float barMarginHeight = 2;
RectF barRect = new RectF();
barRect.bottom = canvasHeight -50 ;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 255; bin++)
{
float prob = (float)mRedHistogram[bin] / (float)redHistogramSum;
barRect.top = barRect.bottom -
Math.min(100,prob*barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintGray);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
// Draw green intensity histogram
barRect.bottom = canvasHeight -50 ;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 255; bin++)
{
barRect.top = barRect.bottom - Math.min(100, ((float)mGreenHistogram[bin])/((float)greenHistogramSum) * barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintGray);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
// Draw blue intensity histogram
barRect.bottom = canvasHeight -50 ;
barRect.left = marginWidth;
barRect.right = barRect.left + barWidth;
for (int bin = 0; bin < 255; bin++)
{
barRect.top = barRect.bottom - Math.min(100, ((float)mBlueHistogram[bin])/((float)blueHistogramSum) * barMaxHeight) - barMarginHeight;
canvas.drawRect(barRect, mPaintBlack);
barRect.top += barMarginHeight;
canvas.drawRect(barRect, mPaintGray);
barRect.left += barWidth;
barRect.right += barWidth;
} // bin
} // end if statement
super.onDraw(canvas);
}
private void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0) y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143) r = 262143;
if (g < 0) g = 0; else if (g > 262143) g = 262143;
if (b < 0) b = 0; else if (b > 262143) b = 262143;
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
}
}
}
private void calculateIntensityHistogram(int[] rgb, int[] histogram, int width, int height, int component)
{
for (int bin = 0; bin < 256; bin++)
{
histogram[bin] = 0;
} // bin
if (component == 0) // red
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = (rgb[pix] >> 16) & 0xff;
histogram[ pixVal ]++;
} // pix
}
else if (component == 1) // green
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = (rgb[pix] >> 8) & 0xff;
histogram[ pixVal ]++;
} // pix
}
else // blue
{
for (int pix = 0; pix < width*height; pix += 3)
{
int pixVal = rgb[pix] & 0xff;
histogram[ pixVal ]++;
} // pix
}
}
}
}
But its not generating reliable histogram, I need to generate same histogram as in Adobe Photoshop. In ios its generating same histogram as in Adobe Photoshop using following code.
-(void)readImage:(UIImage*)image
{
CGImageRef imageRef = [image CGImage];
NSUInteger width = CGImageGetWidth(imageRef);
NSUInteger height = CGImageGetHeight(imageRef);
// NSLog(#"histogram width:- %d",width);
// NSLog(#"histogram height:- %d",height);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
unsigned char *rawData = (unsigned char*) calloc(height * width * 4, sizeof(unsigned char));
NSUInteger bytesPerPixel = 4;
NSUInteger bytesPerRow = bytesPerPixel * width;
NSUInteger bitsPerComponent = 8;
CGContextRef context = CGBitmapContextCreate(rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGContextRelease(context);
for (int yy=0;yy<height; yy++)
{
for (int xx=0; xx<width; xx++)
{
// Now your rawData contains the image data in the RGBA8888 pixel format.
int byteIndex = (bytesPerRow * yy) + xx * bytesPerPixel;
for (int ii = 0 ; ii < 1 ; ++ii)
{
CGFloat red = (rawData[byteIndex] * 1.0) ;
CGFloat green = (rawData[byteIndex + 1] * 1.0) ;
CGFloat blue = (rawData[byteIndex + 2] * 1.0) ;
// CGFloat alpha = (rawData[byteIndex + 3] * 1.0) / 255.0;
byteIndex += 4;
// TYPE CASTING ABOVE FLOAT VALUES TO THAT THEY CAN BE MATCHED WITH ARRAY'S INDEX.
int redValue = (int)red;
int greenValue = (int)green;
int blueValue = (int)blue;
// THESE COUNTERS COUNT " TOTAL NUMBER OF PIXELS " FOR THAT Red , Green or Blue Value IN ENTIRE IMAGE.
fltR[redValue]++;
fltG[greenValue]++;
fltB[blueValue]++;
}
}
}
[self makeArrays];
// for (int yy=0;yy<height; yy++)
// {
// for (int xx=0; xx<width; xx++)
// {
// int byteIndex = (bytesPerRow * yy) + xx * bytesPerPixel;
// rawData [byteIndex] = nil;
// }
// }
// rawData = 0;
// rawData = nil;
static unsigned updateCounter = 0;
memset(rawData, updateCounter & 0xff, width*height*4);
free(rawData);
rawData = NULL;
for(int i=0;i<=255;i++){
fltR[i]=0;
fltG[i]=0;
fltB[i]=0;
}
colorSpace = nil;
}
-(void)makeArrays
{
float max=0;
int maxR=0;
int maxG=0;
int maxB=0;
// PERFORMING SUMMESION OF ALL RED , GREEN AND BLUE VLAUES GRADUALLY TO TAKE AVERAGE OF THEM
// NSLog(#"makeArray :- ,fltR[i] = %f ,fltG[i] = %f ,fltB[i] = %f",fltR[i],fltG[i],fltB[i])
for (int i=0; i<=255; i++)
{
// NSLog(#"makeArray :- ,fltR[i] = %f ,fltG[i] = %f ,fltB[i] = %f",fltR[i],fltG[i],fltB[i]);
maxR += fltR[i];
maxG += fltG[i];
maxB += fltB[i];
}
// CALCULATING AVERAGE OF ALL red, green and blue values.
maxR = maxR/255;
maxG = maxG/255;
maxB = maxB/255;
// As I AM GENERATING 3 GRAPHS , ITS COMPULSARY TO KEEP THEM ON SCREEN SO TAKING THEIR AVERAGE.
max = (maxR+maxG+maxB)/3;
// DEVIDED BY 8 TO GET GRAPH OF THE SAME SIZE AS ITS IN PREVIEW
max = max*2.5;
arrAllPoints = [[NSMutableArray alloc] init];
for (int i=0; i<=255; i++)
{
ClsDrawPoint *objPoint = [[ClsDrawPoint alloc] init];
objPoint.x = i;
objPoint.y = fltR[i]*scale/max;
[arrAllPoints addObject:objPoint];
}
redGraphView.arrRedPoints = arrAllPoints;
// redGraphView.graphColor = [UIColor redColor];
redGraphView.graphColor = [UIColor whiteColor];
[redGraphView drawGraphForArray:arrAllPoints]; /* redGraphView is an object of ClsDraw (custom class of UIView) and this call drws graph from the points of arrAllPoints */
arrAllPoints = [[NSMutableArray alloc] init];
for (int i=0; i<=255; i++)
{
ClsDrawPoint *objPoint = [[ClsDrawPoint alloc] init];
objPoint.x = i;
objPoint.y = fltG[i]*scale/max;
[arrAllPoints addObject:objPoint];
}
greenGraphView.arrRedPoints = arrAllPoints;
// greenGraphView.graphColor = [UIColor greenColor];
greenGraphView.graphColor = [UIColor whiteColor];
[greenGraphView drawGraphForArray:arrAllPoints]; /* greenGraphView is an object of ClsDraw (custom class of UIView) and this call drws graph from the points of arrAllPoints */
arrAllPoints = [[NSMutableArray alloc] init];
for (int i=0; i<=255; i++)
{
ClsDrawPoint *objPoint = [[ClsDrawPoint alloc] init];
objPoint.x = i;
objPoint.y = fltB[i]*scale/max;
[arrAllPoints addObject:objPoint];
}
blueGraphView.arrRedPoints = arrAllPoints;
// blueGraphView.graphColor = [UIColor blueColor];
blueGraphView.graphColor = [UIColor whiteColor];
[blueGraphView drawGraphForArray:arrAllPoints]; /* blueGraphView is an object of ClsDraw (custom class of UIView) and this call drws graph from the points of arrAllPoints */
// THE COORDINATE SYSTEM OF IOS IS TOTALLY OPPOSITE TO THAT OF THE MAC'S SO ROTATED IT WITH REFERENCE TO X - axis.
blueGraphView.layer.transform = CATransform3DMakeRotation(M_PI, 1.0,0.0, 0.0);
redGraphView.layer.transform = CATransform3DMakeRotation(M_PI, 1.0,0.0, 0.0);
greenGraphView.layer.transform = CATransform3DMakeRotation(M_PI, 1.0,0.0, 0.0);
}
I tried to find Adobe Photoshop android api for it but i didn't find. Is there other api to develop histogram app?
Thanks,

Finally i got the solution & i created colored histogram with following code,
EDIT :
I have put my complete code,
DangiAndroidHistogram.java
import java.io.IOException;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.example.myandroidhistogram.R;
public class DangiAndroidHistogram extends Activity {
Bitmap bi = null;
boolean isColored;
LinearLayout view;
LinearLayout view_color;
boolean flag;
private int SIZE = 256;
// Red, Green, Blue
private int NUMBER_OF_COLOURS = 3;
public final int RED = 0;
public final int GREEN = 1;
public final int BLUE = 2;
private int[][] colourBins;
private volatile boolean loaded = false;
private int maxY;
private static final int LDPI = 0;
private static final int MDPI = 1;
private static final int TVDPI = 2;
private static final int HDPI = 3;
private static final int XHDPI = 4;
float offset = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.activity_main);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
if(metrics.densityDpi==metrics.DENSITY_LOW)
offset = 0.75f;
else if(metrics.densityDpi==metrics.DENSITY_MEDIUM)
offset = 1f;
else if(metrics.densityDpi==metrics.DENSITY_TV)
offset = 1.33f;
else if(metrics.densityDpi==metrics.DENSITY_HIGH)
offset = 1.5f;
else if(metrics.densityDpi==metrics.DENSITY_XHIGH)
offset = 2f;
Log.e("NIRAV",""+offset);
colourBins = new int[NUMBER_OF_COLOURS][];
for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
colourBins[i] = new int[SIZE];
}
loaded = false;
Button upload = (Button) findViewById(R.id.upload);
upload.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (flag) {
view_color.removeAllViews();
view.removeAllViews();
}
Intent it = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(it, 101);
flag = true;
/*
* LinearLayout view = (LinearLayout) findViewById(R.id.lyt);
* view.addView(new MyHistogram(getApplicationContext()));
*/
}
});
Button histogram = (Button) findViewById(R.id.hst_btn);
histogram.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (bi != null) {
isColored = false;
view = (LinearLayout) findViewById(R.id.lyt);
view.addView(new MyHistogram(getApplicationContext(), bi));
}
}
});
Button histogram_color = (Button) findViewById(R.id.hst_color_btn);
histogram_color.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (bi != null) {
isColored = true;
view_color = (LinearLayout) findViewById(R.id.lyt_color);
view_color.addView(new MyHistogram(getApplicationContext(),
bi));
}
}
});
}
protected void onActivityResult(int requestCode, int resultCode,
Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch (requestCode) {
case 101:
if (resultCode == RESULT_OK) {
Uri selectedImage = imageReturnedIntent.getData();
String filename = getRealPathFromURI(selectedImage);
bi = BitmapFactory.decodeFile(filename);
/*
ByteArrayOutputStream out = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPEG,10,out);
bi = BitmapFactory.decodeStream(new ByteArrayInputStream(out.toByteArray()));*/
if(bi!=null)
{
try {
new MyAsync().execute();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
public String getRealPathFromURI(Uri contentUri) {
Log.e("TEST", "GetRealPath : " + contentUri);
try {
if (contentUri.toString().contains("video")) {
String[] proj = { MediaStore.Video.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} else {
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
class MyAsync extends AsyncTask
{
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
showDialog(0);
}
#Override
protected Object doInBackground(Object... params) {
// TODO Auto-generated method stub
try {
load(bi);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Object result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
ImageView img = (ImageView) findViewById(R.id.img);
img.setImageBitmap(bi);
((Button) findViewById(R.id.hst_btn)).setVisibility(View.VISIBLE);
((Button) findViewById(R.id.hst_color_btn)).setVisibility(View.VISIBLE);
dismissDialog(0);
}
}
public void load(Bitmap bi) throws IOException {
if (bi != null) {
// Reset all the bins
for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
for (int j = 0; j < SIZE; j++) {
colourBins[i][j] = 0;
}
}
for (int x = 0; x < bi.getWidth(); x++) {
for (int y = 0; y < bi.getHeight(); y++) {
int pixel = bi.getPixel(x, y);
colourBins[RED][Color.red(pixel)]++;
colourBins[GREEN][Color.green(pixel)]++;
colourBins[BLUE][Color.blue(pixel)]++;
}
}
maxY = 0;
for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
for (int j = 0; j < SIZE; j++) {
if (maxY < colourBins[i][j]) {
maxY = colourBins[i][j];
}
}
}
loaded = true;
} else {
loaded = false;
}
}
class MyHistogram extends View {
public MyHistogram(Context context, Bitmap bi) {
super(context);
}
#Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
if (loaded) {
canvas.drawColor(Color.GRAY);
Log.e("NIRAV", "Height : " + getHeight() + ", Width : "
+ getWidth());
int xInterval = (int) ((double) getWidth() / ((double) SIZE + 1));
for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
Paint wallpaint;
wallpaint = new Paint();
if (isColored) {
if (i == RED) {
wallpaint.setColor(Color.RED);
} else if (i == GREEN) {
wallpaint.setColor(Color.GREEN);
} else if (i == BLUE) {
wallpaint.setColor(Color.BLUE);
}
} else {
wallpaint.setColor(Color.WHITE);
}
wallpaint.setStyle(Style.FILL);
Path wallpath = new Path();
wallpath.reset();
wallpath.moveTo(0, getHeight());
for (int j = 0; j < SIZE - 1; j++) {
int value = (int) (((double) colourBins[i][j] / (double) maxY) * (getHeight()+100));
//if(j==0) {
// wallpath.moveTo(j * xInterval* offset, getHeight() - value);
//}
// else {
wallpath.lineTo(j * xInterval * offset, getHeight() - value);
// }
}
wallpath.lineTo(SIZE * offset, getHeight());
canvas.drawPath(wallpath, wallpaint);
}
}
}
}
#Override
protected Dialog onCreateDialog(int id) {
ProgressDialog dataLoadProgress = new ProgressDialog(this);
dataLoadProgress.setMessage("Loading...");
dataLoadProgress.setIndeterminate(true);
dataLoadProgress.setCancelable(false);
dataLoadProgress.setProgressStyle(android.R.attr.progressBarStyleLarge);
return dataLoadProgress;
}
}
activity_main.xml
<LinearLayout 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:orientation="horizontal"
android:background="#android:color/black">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical"
android:background="#android:color/white">
<LinearLayout
android:id="#+id/lyt"
android:layout_width="257dp"
android:layout_height="140dp"
android:orientation="vertical" >
</LinearLayout>
<Button
android:id="#+id/hst_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Histogram"
android:visibility="invisible"/>
<Button
android:id="#+id/hst_color_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Color Histogram"
android:visibility="invisible"/>
<LinearLayout
android:id="#+id/lyt_color"
android:layout_width="257dp"
android:layout_height="140dp"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/img"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"
android:src="#drawable/ic_launcher" />
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select Image"
android:id="#+id/upload"
android:layout_margin="20dp"
android:background="#android:color/white"
android:textColor="#android:color/black"/>
</RelativeLayout>
</LinearLayout>
I hope this example will help others also..!