Wednesday, March 9, 2011

Get Current Screen Orientation in ANDROID

AIM:  Get Current Screen Orientation in ANDROID
The following method does the required functionality.

public int getScreenOrientation() {

// Query what the orientation currently really is.
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT)                {
   // The following message is only displayed once.
    return 1; // Portrait Mode

}else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
   // The following message is only displayed once.
    return 2;   // Landscape mode
return 0;

This is simple and effective.

Please let me know if any.

Images with Coverflow like animation in ANDROID

AIM:  To show an array of images in CoverFlow like animation in ANDROID Gallery.
We need to create one custom gallery extends Gallery.

File 1: 
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;

public class CoverFlow extends Gallery {

     * Graphics Camera used for transforming the matrix of ImageViews
    private Camera mCamera = new Camera();

     * The maximum angle the Child ImageView will be rotated by
    private int mMaxRotationAngle = 60;
     * The maximum zoom on the centre Child
    private int mMaxZoom = -120;
     * The Centre of the Coverflow
    private int mCoveflowCenter;
 public CoverFlow(Context context) {

 public CoverFlow(Context context, AttributeSet attrs) {
  super(context, attrs);

  public CoverFlow(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
     * Get the max rotational angle of the image
  * @return the mMaxRotationAngle
 public int getMaxRotationAngle() {
  return mMaxRotationAngle;

  * Set the max rotational angle of each image
  * @param maxRotationAngle the mMaxRotationAngle to set
 public void setMaxRotationAngle(int maxRotationAngle) {
  mMaxRotationAngle = maxRotationAngle;

  * Get the Max zoom of the centre image
  * @return the mMaxZoom
 public int getMaxZoom() {
  return mMaxZoom;

  * Set the max zoom of the centre image
  * @param maxZoom the mMaxZoom to set
 public void setMaxZoom(int maxZoom) {
  mMaxZoom = maxZoom;

     * Get the Centre of the Coverflow
     * @return The centre of this Coverflow.
    private int getCenterOfCoverflow() {
        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft();
     * Get the Centre of the View
     * @return The centre of the given view.
    private static int getCenterOfView(View view) {
        return view.getLeft() + view.getWidth() / 2;
  * {@inheritDoc}
  * @see #setStaticTransformationsEnabled(boolean)
    protected boolean getChildStaticTransformation(View child, Transformation t) {
  final int childCenter = getCenterOfView(child);
  final int childWidth = child.getWidth() ;
  int rotationAngle = 0;
        if (childCenter == mCoveflowCenter) {
            transformImageBitmap((ImageView) child, t, 0);
        } else {    
            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter)/ childWidth) *  mMaxRotationAngle);
            if (Math.abs(rotationAngle) > mMaxRotationAngle) {
             rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;  
            transformImageBitmap((ImageView) child, t, rotationAngle);        
  return true;

  * This is called during layout when the size of this view has changed. If
  * you were just added to the view hierarchy, you're called with the old
  * values of 0.
  * @param w Current width of this view.
  * @param h Current height of this view.
  * @param oldw Old width of this view.
  * @param oldh Old height of this view.
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
      mCoveflowCenter = getCenterOfCoverflow();
      super.onSizeChanged(w, h, oldw, oldh);
      * Transform the Image Bitmap by the Angle passed
      * @param imageView ImageView the ImageView whose bitmap we want to rotate
      * @param t transformation
      * @param rotationAngle the Angle by which to rotate the Bitmap
     private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) {       ;
      final Matrix imageMatrix = t.getMatrix();;
      final int imageHeight = child.getLayoutParams().height;;
      final int imageWidth = child.getLayoutParams().width;
      final int rotation = Math.abs(rotationAngle);
      mCamera.translate(0.0f, 0.0f, 100.0f);
      //As the angle of the view gets less, zoom in    
      if ( rotation < mMaxRotationAngle ) {
       float zoomAmount = (float) (mMaxZoom +  (rotation * 1.5));
       mCamera.translate(0.0f, 0.0f, zoomAmount);        
      imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2));
      imageMatrix.postTranslate((imageWidth/2), (imageHeight/2));
File 2:
Activity Class ,where you need to show the Coverflow of Images

public class CoverFlowExample extends Activity {
    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
     CoverFlow coverFlow;
     coverFlow = new CoverFlow(this);
     coverFlow.setAdapter(new ImageAdapter(this));

     ImageAdapter coverImageAdapter =  new ImageAdapter(this);
     coverFlow.setSelection(4, true);

 public class ImageAdapter extends BaseAdapter {
     int mGalleryItemBackground;
     private Context mContext;

     private FileInputStream fis;
     private Integer[] mImageIds = {

     private ImageView[] mImages;
     public ImageAdapter(Context c) {
      mContext = c;
      mImages = new ImageView[mImageIds.length];
  public boolean createReflectedImages() {
          //The gap we want between the reflection and the original image
          final int reflectionGap = 4;
          int index = 0;
          for (int imageId : mImageIds) {
        Bitmap originalImage = BitmapFactory.decodeResource(getResources(), 
           int width = originalImage.getWidth();
           int height = originalImage.getHeight();
           //This will not scale but will flip on the Y axis
           Matrix matrix = new Matrix();
           matrix.preScale(1, -1);
           //Create a Bitmap with the flip matrix applied to it.
           //We only want the bottom half of the image
           Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);
           //Create a new bitmap with same width but taller to fit reflection
           Bitmap bitmapWithReflection = Bitmap.createBitmap(width 
             , (height + height/2), Config.ARGB_8888);
          //Create a new Canvas with the bitmap that's big enough for
          //the image plus gap plus reflection
          Canvas canvas = new Canvas(bitmapWithReflection);
          //Draw in the original image
          canvas.drawBitmap(originalImage, 0, 0, null);
          //Draw in the gap
          Paint deafaultPaint = new Paint();
          canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
          //Draw in the reflection
          canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
          //Create a shader that is a linear gradient that covers the reflection
          Paint paint = new Paint(); 
          LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, 
            bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, 
          //Set the paint to use this shader (linear gradient)
          //Set the Transfer mode to be porter duff and destination in
          paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); 
          //Draw a rectangle using the paint with our linear gradient
          canvas.drawRect(0, height, width, 
            bitmapWithReflection.getHeight() + reflectionGap, paint); 
          ImageView imageView = new ImageView(mContext);
          android.widget.Gallery.LayoutParams imgLayout = new CoverFlow.LayoutParams(320, 480);
          imageView.setPadding(30, 100, 20, 20);
          mImages[index++] = imageView;
       return true;

     public int getCount() {
         return mImageIds.length;

     public Object getItem(int position) {
         return position;

     public long getItemId(int position) {
         return position;

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

      //Use this code if you want to load from resources
         ImageView i = new ImageView(mContext);
         i.setLayoutParams(new CoverFlow.LayoutParams(380, 450));
         //Make sure we set anti-aliasing otherwise we get jaggies
         BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
         return i;
      //return mImages[position];
   /** Returns the size (0.0f to 1.0f) of the views 
      * depending on the 'offset' to the center. */ 
      public float getScale(boolean focused, int offset) { 
        /* Formula: 1 / (2 ^ offset) */ 
          return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset))); 

The output will be as follows ( in GAlaXY TABlet) 

Please let me know if any.

Access LOGCAT DATA in your ANDROID application Progrmatically.

To read the LOGCAT data in your application which is very helpful  for bugreport purposes and for trobleshooting the device issues from remote location.


You can check LOGCAT API documentation at  developer site.

Writing program to use that API and to print your logcat data in a Scrollable TextView.

     public class ReadLogCat extends Activity {
      public void onCreate(Bundle savedInstanceState) {
        try {
          Process process = Runtime.getRuntime().exec("logcat -v");// Verbose filter
/*  Check diffrent filters available at , Options section */

          BufferedReader bufferedReader = new BufferedReader(
          new InputStreamReader(process.getInputStream()));
          StringBuilder logString=new StringBuilder();
          String line;
          while ((line = bufferedReader.readLine()) != null) {
          TextView tv = (TextView)findViewById(;
        } catch (IOException e) {

2) To perform this operation we need to set Permissions in AndroidManifest.xml file as 

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

3) The following is the LOGCAT window in ECLIPSE IDE.

Logcat window in ECLIPSE
 Post your comments if any .

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