Check in Gesture example.

Chapter8/GestureThrowaway/AndroidManifest.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk android:minSdkVersion="14" />
+
+    <application
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name" >
+        <activity
+            android:label="@string/app_name"
+            android:name=".GestureExampleActivity" >
+            <intent-filter >
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

Chapter8/GestureThrowaway/proguard.cfg

@@ -0,0 +1,40 @@
+-optimizationpasses 5
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-dontpreverify
+-verbose
+-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
+
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Application
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.app.backup.BackupAgentHelper
+-keep public class * extends android.preference.Preference
+-keep public class com.android.vending.licensing.ILicensingService
+
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+-keepclassmembers class * extends android.app.Activity {
+   public void *(android.view.View);
+}
+
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keep class * implements android.os.Parcelable {
+  public static final android.os.Parcelable$Creator *;
+}

Chapter8/GestureThrowaway/project.properties

@@ -0,0 +1,11 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-14

Chapter8/GestureThrowaway/res/drawable/circle.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval" >
+    <solid android:color="#80FF00FF"/>
+
+    <size
+        android:height="100dp"
+        android:width="100dp" />
+
+</shape>

Chapter8/GestureThrowaway/res/layout/main.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/layout"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:orientation="vertical" />
+

Chapter8/GestureThrowaway/res/layout/row.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <TextView 
+        android:id="@+id/text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>

Chapter8/GestureThrowaway/res/values/strings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="hello">Hello World, GestureExampleActivity!</string>
+    <string name="app_name">GestureExample</string>
+
+</resources>

Chapter8/GestureThrowaway/src/com/example/GestureExampleActivity.java

@@ -0,0 +1,15 @@
+package com.example;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class GestureExampleActivity extends Activity  {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        TouchExample view = new TouchExample(this);
+        setContentView(view);
+    }
+}

Chapter8/GestureThrowaway/src/com/example/TouchExample.java

@@ -0,0 +1,113 @@
+package com.example;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.ScaleGestureDetector;
+import android.view.View;
+
+public class TouchExample extends View {
+    private static final int MAX_POINTERS = 5;
+    private float mScale = 1f;
+    private GestureDetector mGestureDetector;
+    private ScaleGestureDetector mScaleGestureDetector;
+
+    private Pointer[] mPointers = new Pointer[MAX_POINTERS];
+    private Paint mPaint;
+    private float mFontSize;
+
+    class Pointer {
+        float x = 0;
+        float y = 0;
+        int index = -1;
+        int id = -1;
+    }
+
+    public TouchExample(Context context) {
+        super(context);
+        for (int i = 0; i<MAX_POINTERS; i++) {
+            mPointers[i] = new Pointer();
+        }
+
+        mFontSize = 16 * getResources().getDisplayMetrics().density;
+        mPaint = new Paint();
+        mPaint.setColor(Color.WHITE);
+        mPaint.setTextSize(mFontSize);
+
+        mGestureDetector = new GestureDetector(context, new ZoomGesture());
+        mScaleGestureDetector = new ScaleGestureDetector(context, new ScaleGesture());
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        for (Pointer p : mPointers) {
+            if (p.index != -1) {
+                String text = "Index: " + p.index + " ID: " + p.id;
+                canvas.drawText(text, p.x, p.y, mPaint);
+            }
+        }
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        mGestureDetector.onTouchEvent(event);
+        mScaleGestureDetector.onTouchEvent(event);
+
+        int pointerCount = Math.min(event.getPointerCount(), MAX_POINTERS);
+        switch (event.getAction() & MotionEvent.ACTION_MASK) {
+        case MotionEvent.ACTION_DOWN:
+        case MotionEvent.ACTION_POINTER_DOWN:
+        case MotionEvent.ACTION_MOVE:
+            // clear previous pointers
+            for (int id = 0; id<MAX_POINTERS; id++)
+                mPointers[id].index = -1;
+
+            // Now fill in the current pointers
+            for (int i = 0; i<pointerCount; i++) {
+                int id = event.getPointerId(i);
+                Pointer pointer = mPointers[id];
+                pointer.index = i;
+                pointer.id = id;
+                pointer.x = event.getX(i);
+                pointer.y = event.getY(i);
+            }
+            invalidate();
+            break;
+        case MotionEvent.ACTION_CANCEL:
+            for (int i = 0; i<pointerCount; i++) {
+                int id = event.getPointerId(i);
+                mPointers[id].index = -1;
+            }
+            invalidate();
+            break;
+        }
+        return true;
+    }
+
+    public class ZoomGesture extends GestureDetector.SimpleOnGestureListener {
+        private boolean normal = true;
+
+        @Override
+        public boolean onDoubleTap(MotionEvent e) {
+            mScale = normal ? 3f : 1f;
+            mPaint.setTextSize(mScale*mFontSize);
+            normal = !normal;
+            invalidate();
+            return true;
+        }
+    }
+
+    public class ScaleGesture extends ScaleGestureDetector.SimpleOnScaleGestureListener {
+        @Override
+        public boolean onScale(ScaleGestureDetector detector) {
+            mScale *= detector.getScaleFactor();
+            mPaint.setTextSize(mScale*mFontSize);
+            invalidate();
+            return true;
+        }
+    }
+}