Android Open Source - TheCompressYourFiles Touch Image View

• Back to Development/file  ↑

From Project

Back to project page TheCompressYourFiles.

License

The source code is released under:

Apache License

Java Source Code

package th.watsize.imageviewer;
// w ww.j  av a 2  s .c  o m
import java.io.File;

import th.watsize.filebrowser.FileUtils;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;

public class TouchImageView extends ImageView {

  private static final String TAG = "Touch";
  private static final int MAX_PIXELS = 1000*8*32; // Megabytes to pixels
  // These matrices will be used to move and zoom image
  private Matrix matrix = new Matrix();
  private Matrix savedMatrix = new Matrix();
  private Bitmap image;
  private File imageFile;

  // We can be in one of these 3 states
  static final int NONE = 0;
  static final int DRAG = 1;
  static final int ZOOM = 2;
  int mode = NONE;

  // Remember some things for zooming
  private PointF start = new PointF();
  private PointF mid = new PointF();
  private float oldDist = 1f;
  
  private Context context;
  
  public TouchImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    super.setClickable(true);
    this.context = context;
    
    matrix.setTranslate(1f, 1f);
    setImageMatrix(matrix);
    setScaleType(ScaleType.MATRIX);
    
    setOnTouchListener(new OnTouchListener() {

      public boolean onTouch(View v, MotionEvent rawEvent) {
        WrapMotionEvent event = WrapMotionEvent.wrap(rawEvent);

        // Dump touch event to log
        if (FileUtils.isDebug){
          dumpEvent(event);
        }

        // Handle touch events here...
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
          savedMatrix.set(matrix);
          start.set(event.getX(), event.getY());
          Log.d(TAG, "mode=DRAG");
          mode = DRAG;
          break;
        case MotionEvent.ACTION_POINTER_DOWN:
          oldDist = spacing(event);
          Log.d(TAG, "oldDist=" + oldDist);
          if (oldDist > 10f) {
            savedMatrix.set(matrix);
            midPoint(mid, event);
            mode = ZOOM;
            Log.d(TAG, "mode=ZOOM");
          }
          break;
        case MotionEvent.ACTION_UP:
          int xDiff = (int) Math.abs(event.getX() - start.x);
          int yDiff = (int) Math.abs(event.getY() - start.y);
          if (xDiff < 15 && yDiff < 15){
            performClick();
          }
        case MotionEvent.ACTION_POINTER_UP:
          mode = NONE;
          Log.d(TAG, "mode=NONE");
          break;
        case MotionEvent.ACTION_MOVE:
          if (mode == DRAG) {

            matrix.set(savedMatrix);
            matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
          } else if (mode == ZOOM) {
            float newDist = spacing(event);
            Log.d(TAG, "newDist=" + newDist);
            if (newDist > 10f) {
              matrix.set(savedMatrix);
              float scale = newDist / oldDist;
              matrix.postScale(scale, scale, mid.x, mid.y);
            }
          }
          break;
        }

        setImageMatrix(matrix);
        return true; // indicate event was handled
      }

    });
  }
  
  
   public void setImage(Bitmap img, int displayWidth, int displayHeight) { 
    super.setImageBitmap(img);
    image = img;
    centerImage();
   }
   
   public File getFile(){
     return imageFile;
   }
   
   @Override
   public void onSizeChanged(int displayWidth, int displayHeight,int s, int d){
     centerImage();
   }
   
   private void centerImage(){
     int width = super.getWidth();
     int height = super.getHeight();
       FileUtils.printDebug("Centered and resized image");
      float scale;
      if ((height / image.getHeight()) >= (width / image.getWidth())){
        scale =  (float)width / (float)image.getWidth();
      } else {
        scale = (float)height / (float)image.getHeight();
      }
      
      matrix.reset();
      savedMatrix.reset();
      setImageMatrix(matrix);
      
      matrix.postScale(scale, scale, mid.x, mid.y);
      setImageMatrix(matrix);
      
      float redundantYSpace = (float)height - (scale * (float)image.getHeight()) ;
      float redundantXSpace = (float)width - (scale * (float)image.getWidth());
      
      redundantYSpace /= (float)2;
      redundantXSpace /= (float)2;

      savedMatrix.set(matrix);
      matrix.postTranslate(redundantXSpace, redundantYSpace);
      
      setImageMatrix(matrix);
   }
  
   
  /** Show an event in the LogCat view, for debugging */
   private void dumpEvent(WrapMotionEvent event) {
    // ...
    String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
        "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
    StringBuilder sb = new StringBuilder();
    int action = event.getAction();
    int actionCode = action & MotionEvent.ACTION_MASK;
    sb.append("event ACTION_").append(names[actionCode]);
    if (actionCode == MotionEvent.ACTION_POINTER_DOWN
        || actionCode == MotionEvent.ACTION_POINTER_UP) {
      sb.append("(pid ").append(
          action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
      sb.append(")");
    }
    sb.append("[");
    for (int i = 0; i < event.getPointerCount(); i++) {
      sb.append("#").append(i);
      sb.append("(pid ").append(event.getPointerId(i));
      sb.append(")=").append((int) event.getX(i));
      sb.append(",").append((int) event.getY(i));
      if (i + 1 < event.getPointerCount())
        sb.append(";");
    }
    sb.append("]");
    Log.d(TAG, sb.toString());
  }

  /** Determine the space between the first two fingers */
  private float spacing(WrapMotionEvent event) {
    // ...
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.sqrt(x * x + y * y);
  }

  /** Calculate the mid point of the first two fingers */
  private void midPoint(PointF point, WrapMotionEvent event) {
    // ...
    float x = event.getX(0) + event.getX(1);
    float y = event.getY(0) + event.getY(1);
    point.set(x / 2, y / 2);
  }
}

Java Source Code List

• Back to Development/file  ↑