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POAndroid Pinch and Zoom Image in Activity
 

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    <p>I have a ListView with set of images. On clicking any of them, the clicked image will appear on a new activity and at the center of the activity in ImageView, also it is Zoomable. The Problem is when i zoom the image it gains Zoom but also moves like drag and drop. I should eliminate that movement of the image and should only be zoomable from the center of the activity.</p> <p><strong>ZoomInZoomOutActivity.java</strong></p> <pre><code>public class ZoomInZoomOutActivity extends Activity implements OnTouchListener { private static final String TAG = "Touch"; @SuppressWarnings("unused") private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f; Matrix matrix = new Matrix(); Matrix savedMatrix = new Matrix(); static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; PointF start = new PointF(); PointF mid = new PointF(); float oldDist = 1f; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.imagedisp); Bundle extras = getIntent().getExtras(); long id =extras.getLong("ID"); String s=String.valueOf(id); ImageView view; view = (ImageView) findViewById(R.id.imageView1); view.setOnTouchListener(this); if (s.equals("0")) { view.setImageResource(R.drawable.img1); } else if (s.equals("1")) { view.setImageResource(R.drawable.img2); } else if (s.equals("2")) { view.setImageResource(R.drawable.img3); } else { view.setImageResource(R.drawable.img4); } } public boolean onTouch(View v, MotionEvent event) { ImageView view = (ImageView) v; view.setScaleType(ImageView.ScaleType.MATRIX); float scale; switch (event.getAction() &amp; 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_UP: case MotionEvent.ACTION_POINTER_UP: mode = NONE; Log.d(TAG, "mode=NONE"); break; case MotionEvent.ACTION_POINTER_DOWN: oldDist = spacing(event); Log.d(TAG, "oldDist=" + oldDist); if (oldDist &gt; 5f) { savedMatrix.set(matrix); midPoint(mid, event); mode = ZOOM; Log.d(TAG, "mode=ZOOM"); } 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 &gt; 5f) { matrix.set(savedMatrix); scale = newDist / oldDist; matrix.postScale(scale, scale, mid.x, mid.y); } } break; } view.setImageMatrix(matrix); return true; } private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } private void midPoint(PointF point, MotionEvent event) { float x = event.getX(0) + event.getX(1); float y = event.getY(0) + event.getY(1); point.set(x / 2, y / 2); } } </code></pre> <p><strong>imagedisp.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center"&gt; &lt;ImageView android:layout_width="fill_parent" android:id="@+id/imageView1" android:src="@drawable/img1" android:layout_height="fill_parent" android:scaleType="centerInside"&gt; &lt;/ImageView&gt; &lt;/LinearLayout&gt; </code></pre>
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