Working with Images in Android

AndroidPaint.java

package com.exercise.AndroidPaint;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.View;

public class AndroidPaint extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      //setContentView(R.layout.main);
      setContentView(new myView(this));
  }

  private class myView extends View{

 public myView(Context context) {
  super(context);
  // TODO Auto-generated constructor stub
 }

 @Override
 protected void onDraw(Canvas canvas) {
  // TODO Auto-generated method stub
  Bitmap myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.googlelogo320x480);
          canvas.drawBitmap(myBitmap, 0, 0, null);
 }
  }
}

Event handling.java

public boolean onKeyDown(int keyCode, KeyEvent event) {
   if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {

      // Perform the tinting operation
      TintThePicture(20);

      // Display a short message on screen
      nm.notifyWithText(56789, "Picture was tinted",
         NotificationManager.LENGTH_SHORT, null);

      // Save the result
      SaveThePicture();

      return (true);
      }

   return super.onKeyDown(keyCode, event);
}

ImgStretchFillScreen.java

public class Banner extends View {
  private final Drawable logo;

  public Banner(Context context) {
    super(context);
    logo = context.getResources().getDrawable(R.drawable.banner);
    setBackgroundDrawable(logo);
  }

  public Banner(Context context, AttributeSet attrs) {
    super(context, attrs);
    logo = context.getResources().getDrawable(R.drawable.banner);
    setBackgroundDrawable(logo);
  }

  public Banner(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    logo = context.getResources().getDrawable(R.drawable.banner);
    setBackgroundDrawable(logo);
  }

  @Override protected void onMeasure(int widthMeasureSpec,
      int heightMeasureSpec) {
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = width * logo.getIntrinsicHeight() / logo.getIntrinsicWidth();
    setMeasuredDimension(width, height);
  }
}

Manipulating Image Pixels.java

private void TintThePicture(int deg) {
   int[] pix = new int[picw * pich];
   mBitmap.getPixels(pix, 0, picw, 0, 0, picw, pich);

   int RY, GY, BY, RYY, GYY, BYY, R, G, B, Y;
   double angle = (3.14159d * (double)deg) / 180.0d;
   int S = (int)(256.0d * Math.sin(angle));
   int C = (int)(256.0d * Math.cos(angle));

   for (int y = 0; y < pich; y++)
   for (int x = 0; x < picw; x++)
      {
      int index = y * picw + x;
      int r = (pix[index] >> 16) & 0xff;
      int g = (pix[index] >> 8) & 0xff;
      int b = pix[index] & 0xff;
      RY = ( 70 * r - 59 * g - 11 * b) / 100;
      GY = (-30 * r + 41 * g - 11 * b) / 100;
      BY = (-30 * r - 59 * g + 89 * b) / 100;
      Y  = ( 30 * r + 59 * g + 11 * b) / 100;
      RYY = (S * BY + C * RY) / 256;
      BYY = (C * BY - S * RY) / 256;
      GYY = (-51 * RYY - 19 * BYY) / 100;
      R = Y + RYY;
      R = (R < 0) ? 0 : ((R > 255) ? 255 : R);
      G = Y + GYY;
      G = (G < 0) ? 0 : ((G > 255) ? 255 : G);
      B = Y + BYY;
      B = (B < 0) ? 0 : ((B > 255) ? 255 : B);
      pix[index] = 0xff000000 | (R << 16) | (G << 8) | B;
      }

   Bitmap bm = Bitmap.createBitmap(picw, pich, false);
   bm.setPixels(pix, 0, picw, 0, 0, picw, pich);

   // Put the updated bitmap into the main view
   mIV.setImageBitmap(bm);
   mIV.invalidate();

   mBitmap = bm;
   pix = null;
}

Setup.java

READ
----
Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),
   R.drawable.pic1);
int pic_width  = mBitmap.width();
int pic_height = mBitmap.height();
*****

WRITE
-----
try {
   FileOutputStream fos = super.openFileOutput("output.jpg",
      MODE_WORLD_READABLE);

   mBitmap.compress(CompressFormat.JPEG, 75, fos);

   fos.flush();
   fos.close();
   } catch (Exception e) {
   Log.e("MyLog", e.toString());
}
*****

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"
   >
<ImageView id="@+id/picview"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />
</LinearLayout>