Android Open Source - MultiTouchImageView Stretched Image View

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License

The source code is released under:

MIT License

Java Source Code

package com.taig.widget;
//w ww.j av  a  2 s  .c  o  m
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class StretchedImageView extends ImageView
{
  public StretchedImageView( Context context )
  {
    this( context, null, 0 );
  }

  public StretchedImageView( Context context, AttributeSet attributes )
  {
    this( context, attributes, 0 );
  }

  public StretchedImageView( Context context, AttributeSet attributes, int defStyle )
  {
    super( context, attributes, defStyle );

    setImageMatrix( new Matrix() );
    setScaleType( ScaleType.MATRIX );
  }

  @Override
  protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec )
  {
    Drawable drawable = getDrawable();

    if( drawable != null )
    {
      // Scale image to match parent.
      float scale = getInitialScale( MeasureSpec.getSize( widthMeasureSpec ),
                       drawable.getIntrinsicWidth(),
                       MeasureSpec.getSize( heightMeasureSpec ),
                       drawable.getIntrinsicHeight() );

      getImageMatrix().setScale( scale, scale );

      int width = (int) ( drawable.getIntrinsicWidth() * scale );
      int height = (int) ( drawable.getIntrinsicHeight() * scale );

      setMeasuredDimension( width, height );
    }
    else
    {
      super.onMeasure( widthMeasureSpec, heightMeasureSpec );
    }
  }

  /**
   * Get the initial scale factor to match the parent's width or height.
   *
   * @param viewWidth
   * @param imageWidth
   * @param viewHeight
   * @param imageHeight
   * @return
   */
  protected float getInitialScale( int viewWidth, int imageWidth, int viewHeight, int imageHeight )
  {
    float widthScale = viewWidth / (float) imageWidth;
    float heightScale = viewHeight / (float) imageHeight;

    if( widthScale > 0 && heightScale > 0 )
    {
      return Math.min( widthScale, heightScale );
    }
    else if( widthScale > 0 && heightScale == 0 )
    {
      return widthScale;
    }
    else if( widthScale == 0 && heightScale > 0 )
    {
      return heightScale;
    }
    else
    {
      return 0;
    }
  }
}

Java Source Code List

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