Wednesday, March 9, 2011

Get Current Screen Orientation in ANDROID

AIM:  Get Current Screen Orientation in ANDROID
Solution: 
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.
Solution:
We need to create one custom gallery extends Gallery.


File 1: 
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
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) {
  super(context);
  this.setStaticTransformationsEnabled(true);
 }

 public CoverFlow(Context context, AttributeSet attrs) {
  super(context, attrs);
        this.setStaticTransformationsEnabled(true);
 }

  public CoverFlow(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
   this.setStaticTransformationsEnabled(true);  
  }
 
    /**
     * 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;
 
  t.clear();
  t.setTransformationType(Transformation.TYPE_MATRIX);
 
        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) {          
      mCamera.save();
      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);        
      }
    
      mCamera.rotateY(rotationAngle);
      mCamera.getMatrix(imageMatrix);              
      imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2));
      imageMatrix.postTranslate((imageWidth/2), (imageHeight/2));
      mCamera.restore();
 }
}
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. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     
     CoverFlow coverFlow;
     coverFlow = new CoverFlow(this);
     
     coverFlow.setAdapter(new ImageAdapter(this));

     ImageAdapter coverImageAdapter =  new ImageAdapter(this);
     
      coverFlow.setAdapter(coverImageAdapter);
     
     coverFlow.setSpacing(-25);
     coverFlow.setSelection(4, true);
     coverFlow.setAnimationDuration(1000);
         
     setContentView(coverFlow);
    }

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

     private FileInputStream fis;
        
     private Integer[] mImageIds = {
     R.drawable.yadi,
             R.drawable.yadi_1,
             R.drawable.yadi_2,
             R.drawable.yadi_3,
             R.drawable.yadi_4,
             R.drawable.yadi_5,
             R.drawable.yadi_6,
             R.drawable.yadi_7,
             R.drawable.yadi_8
             
     };

     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(), 
          imageId);
           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, 
            TileMode.CLAMP); 
          //Set the paint to use this shader (linear gradient)
          paint.setShader(shader); 
          //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);
          imageView.setImageBitmap(bitmapWithReflection);
          android.widget.Gallery.LayoutParams imgLayout = new CoverFlow.LayoutParams(320, 480);
          imageView.setLayoutParams(imgLayout);
          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.setImageResource(mImageIds[position]);
         i.setLayoutParams(new CoverFlow.LayoutParams(380, 450));
         i.setScaleType(ImageView.ScaleType.CENTER_INSIDE); 
         
         //Make sure we set anti-aliasing otherwise we get jaggies
         BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
         drawable.setAntiAlias(true);
         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.

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


Solution:

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.

1)
     public class ReadLogCat extends Activity {
      @Override
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        try {
          Process process = Runtime.getRuntime().exec("logcat -v");// Verbose filter
/*  Check diffrent filters available at http://developer.android.com/guide/developing/tools/logcat.html , Options section */

          BufferedReader bufferedReader = new BufferedReader(
          new InputStreamReader(process.getInputStream()));
                          
          StringBuilder logString=new StringBuilder();
          String line;
          while ((line = bufferedReader.readLine()) != null) {
            logString.append(line);
          }
          TextView tv = (TextView)findViewById(R.id.logTextView);
          tv.setText(logString.toString());
        } 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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