1 files changed, 135 insertions, 0 deletions
diff --git a/src/plugins/android.codeutils/templates/activity_samples/multitouch_event/multitouch_event_activity.java b/src/plugins/android.codeutils/templates/activity_samples/multitouch_event/multitouch_event_activity.java
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--- /dev/null
+++ b/src/plugins/android.codeutils/templates/activity_samples/multitouch_event/multitouch_event_activity.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package #package_name#;
+
+import android.app.Activity;
+import android.graphics.Matrix;
+import android.graphics.PointF;
+import android.os.Bundle;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+import android.widget.ImageView;
+
+import #ManifestPackageName#.R;
+
+public class #class_name# extends Activity {
+	private ImageView imgView;
+
+	//available operations
+	private final int MOVE = 1;
+	private final int ZOOM = 2;
+	private int action = 0;
+
+	PointF startPoint = new PointF();
+	PointF centerPoint = new PointF();
+	
+	//holds previous state information
+	private double prevDist = 0;
+	private Matrix curMatrix = new Matrix();
+	private Matrix auxMatrix = new Matrix();
+
+	//Minimum distance between fingers 
+	private Double MIN_DISTANCE; 
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.#layout_name#multitouch_event/multitouchlayout.xml#);
+		
+		// convert dip measurements to pixels. Screen independent value.
+		final float scale = getResources().getDisplayMetrics().density;
+		MIN_DISTANCE = (double) ( 15.0f * scale + 0.5f );
+		
+		//loads image view
+		imgView = (ImageView) findViewById(R.id.img01);
+		imgView.setImageMatrix(curMatrix);
+		imgView.setImageResource(R.drawable.#drawable_name#multitouch_event/multitouch.jpg#);
+		imgView.setVisibility(View.VISIBLE);
+		imgView.setOnTouchListener(new OnTouchListener(){
+
+			public boolean onTouch(View v, MotionEvent event) {
+				ImageView view = (ImageView)v;
+
+				//get the 8 bits that represents the action itself 
+				int eventType = event.getAction() & MotionEvent.ACTION_MASK;
+				
+				switch (eventType) {
+				//first touch
+				case MotionEvent.ACTION_DOWN:
+					action = MOVE;
+					auxMatrix.set(curMatrix);
+					startPoint.set(event.getX(), event.getY());
+					break;
+				//second touch
+				case MotionEvent.ACTION_POINTER_DOWN:
+					prevDist = distance(event);
+					if (prevDist > MIN_DISTANCE) {
+						action = ZOOM;
+						auxMatrix.set(curMatrix);
+						//used to center the image
+						centerPoint = mean(event);
+					}
+					break;
+				//movement event
+				case MotionEvent.ACTION_MOVE:
+					//using one finger we drag the image
+					if (action == MOVE) {
+						curMatrix.set(auxMatrix);
+						//moves the image
+						curMatrix.postTranslate(event.getX() - startPoint.x,
+								event.getY() - startPoint.y);
+					}
+					//using two fingers, zoom in or out and rotate the image
+					else if (action == ZOOM) 
+					{
+						double curDist = distance(event);
+						if (curDist > MIN_DISTANCE) {
+							curMatrix.set(auxMatrix);
+							//relation between fingers distance
+							Double scale = curDist / prevDist;
+							//resize image keeping its center position
+							curMatrix.postScale(scale.floatValue(), scale.floatValue(), 
+									centerPoint.x, centerPoint.y);
+						}
+					}
+					break;
+				}
+				//apply changes
+				view.setImageMatrix(curMatrix);
+				return true; 
+			}});
+	}
+
+	/*distance between the two fingers of dual touch event*/
+	private double distance(MotionEvent event) {
+		float dy = event.getY(1) - event.getY(0);
+		float dx = event.getX(1) - event.getX(0);
+		dx *= dx;
+		dy *= dy;
+		return Math.sqrt(dx + dy);
+	}
+	
+	/*evaluates the center point*/
+	private PointF mean(MotionEvent event) {
+		PointF point = new PointF();
+		float dy = event.getY(1) + event.getY(0);
+		float dx = event.getX(1) + event.getX(0);
+		point.set(dx / 2, dy / 2);
+		return point;
+	}
+}
+\ No newline at end of file