I am trying to add a zoom option for the images, that I had bought to an image view. Actually, the image view is working fine and code is running without any errors or issues. ut during zoom on my image view, it is not zooming. My code is as follows.
ZoomInZoomOut.java
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class ZoomInZoomOut extends Activity implements OnTouchListener
{
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f;
// These matrices will be used to scale points of the image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// The 3 states (events) which the user is trying to perform
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen_image);
ImageView view = (ImageView) findViewById(R.id.imgFullscreen);
view.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN: // first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG"); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 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); // create the transformation in the matrix of points
}
else if (mode == ZOOM)
{
// pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f)
{
matrix.set(savedMatrix);
scale = newDist / oldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix); // display the transformation on screen
return true; // indicate event was handled
}
/*
* --------------------------------------------------------------------------
* Method: spacing Parameters: MotionEvent Returns: float Description:
* checks the spacing between the two fingers on touch
* ----------------------------------------------------
*/
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);
}
/*
* --------------------------------------------------------------------------
* Method: midPoint Parameters: PointF object, MotionEvent Returns: void
* Description: calculates the midpoint between the two fingers
* ------------------------------------------------------------
*/
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);
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent 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("Touch Events ---------", sb.toString());
}
Also the activity_fullscreen_image.xml is as follows
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black" >
<ProgressBar
android:id="@+id/pbLoader"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" >
</ProgressBar>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="false"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id"
>
</com.google.android.gms.ads.AdView>
<!-- Scroll view for fullscreen preview -->
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="horizontal" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<ImageView
android:id="@+id/imgFullscreen"
android:layout_width="384dp"
android:layout_height="288dp"
android:layout_gravity="center_vertical" />
<!-- android:scaleType="fitXY" /> -->
</LinearLayout>
</HorizontalScrollView>
<!-- Set as Set wallpaper button -->
<!-- Set as Share button -->
<!-- Download wallpaper button -->
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/frameLayout"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="28dp">
<LinearLayout
android:id="@+id/btShare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:orientation="horizontal"
android:layout_alignWithParentIfMissing="false"
android:baselineAligned="false"
android:layout_alignTop="@+id/llSetWallpaper"
android:layout_alignParentLeft="true"
android:layout_gravity="left|bottom">
<ImageView
android:layout_width="22dp"
android:layout_height="22dp"
android:src="@drawable/common_signin_btn_icon_light" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/Share"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/llSetWallpaper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:orientation="horizontal"
android:layout_alignTop="@+id/llDownloadWallpaper"
android:layout_alignRight="@+id/pbLoader"
android:layout_alignParentBottom="false"
android:layout_centerVertical="true"
android:layout_gravity="center_horizontal|bottom">
<ImageView
android:layout_width="21dp"
android:layout_height="21dp"
android:src="@drawable/ico_apply" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/set_wallpaper"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
</FrameLayout>
<LinearLayout
android:id="@+id/llDownloadWallpaper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:gravity="center_vertical"
android:orientation="horizontal"
android:layout_gravity="right|bottom"
android:layout_alignBottom="@+id/frameLayout"
android:layout_alignParentRight="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/download_wallpaper"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
</RelativeLayout>
Any Suggestions?
