Make ExtendedBitmapDrawable extend BasicBitmapDrawable.

Modify sample app to use ExtendedBitmapDrawable with the following features:
Parallax,
Placholder and progress,
Decode aggregator.

Change-Id: Ia9e0fe6e6fdab018077a465ddf2a40109efbddf7

3 files changed, 67 insertions, 6 deletions

diff --git a/sample/src/com/example/bitmapsample/BitmapRequestKeyImpl.java b/sample/src/com/example/bitmapsample/BitmapRequestKeyImpl.java
index 6c375f1..eeec78f 100644
--- a/sample/src/com/example/bitmapsample/BitmapRequestKeyImpl.java
+++ b/sample/src/com/example/bitmapsample/BitmapRequestKeyImpl.java
@@ -27,6 +27,8 @@ public class BitmapRequestKeyImpl implements RequestKey {
     public final String mUriString;
     public final URL mUrl;
 
+    private boolean mSlept;
+
     public BitmapRequestKeyImpl(String uriString) {
         mUriString = uriString;
         URL url = null;
@@ -36,6 +38,7 @@ public class BitmapRequestKeyImpl implements RequestKey {
             e.printStackTrace();
         }
         mUrl = url;
+        mSlept = false;
     }
 
     @Override
@@ -70,6 +73,20 @@ public class BitmapRequestKeyImpl implements RequestKey {
 
     @Override
     public InputStream createInputStream() throws IOException {
+        // Artificially sleep for (deterministically) random amount of time.
+        if (!mSlept) {
+            // Character difference between shortest and longest uri.
+            final long spread = 26;
+            // Maximum amount of time to sleep.
+            final long max = 2;
+            final long duration = (long) ((float) (mUriString.length() % spread) / spread * max
+                    * 1000);
+            try {
+                Thread.sleep(duration);
+            } catch (InterruptedException ignored) {
+            }
+            mSlept = true;
+        }
         return mUrl.openStream();
     }
 
diff --git a/sample/src/com/example/bitmapsample/BitmapView.java b/sample/src/com/example/bitmapsample/BitmapView.java
index f192963..0613168 100644
--- a/sample/src/com/example/bitmapsample/BitmapView.java
+++ b/sample/src/com/example/bitmapsample/BitmapView.java
@@ -17,13 +17,19 @@
 package com.example.bitmapsample;
 
 import android.content.Context;
+import android.graphics.Canvas;
 import android.util.AttributeSet;
+import android.widget.ListView;
 
 import com.android.bitmap.drawable.BasicBitmapDrawable;
+import com.android.bitmap.drawable.ExtendedBitmapDrawable;
 import com.android.bitmap.view.BitmapDrawableImageView;
 
 public class BitmapView extends BitmapDrawableImageView {
-    private float mDensity;
+    private final float mDensity;
+
+    private ListView mListView;
+    private float mParallaxSpeedMultiplier;
 
     public BitmapView(Context c) {
         this(c, null);
@@ -41,6 +47,24 @@ public class BitmapView extends BitmapDrawableImageView {
 
     @Override
     protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
-        getBasicBitmapDrawable().setDecodeDimensions(w, h);
+        ExtendedBitmapDrawable drawable = (ExtendedBitmapDrawable) getBasicBitmapDrawable();
+        drawable.setDecodeDimensions(w, (int) (h * mParallaxSpeedMultiplier));
+    }
+
+    public void setListView(final ListView listView) {
+        mListView = listView;
+    }
+
+    @Override
+    protected void onDraw(final Canvas canvas) {
+        ExtendedBitmapDrawable drawable = (ExtendedBitmapDrawable) getBasicBitmapDrawable();
+        float fraction = (float) getBottom() / (mListView.getHeight() + getHeight());
+        drawable.setParallaxFraction(fraction);
+
+        super.onDraw(canvas);
+    }
+
+    public void setParallaxSpeedMultiplier(final float parallaxSpeedMultiplier) {
+        mParallaxSpeedMultiplier = parallaxSpeedMultiplier;
     }
 }
\ No newline at end of file
diff --git a/sample/src/com/example/bitmapsample/MainActivity.java b/sample/src/com/example/bitmapsample/MainActivity.java
index 4ad18e5..96e99ec 100644
--- a/sample/src/com/example/bitmapsample/MainActivity.java
+++ b/sample/src/com/example/bitmapsample/MainActivity.java
@@ -17,6 +17,8 @@
 package com.example.bitmapsample;
 
 import android.app.Activity;
+import android.content.res.Resources;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
@@ -24,19 +26,33 @@ import android.widget.BaseAdapter;
 import android.widget.ListView;
 
 import com.android.bitmap.BitmapCache;
+import com.android.bitmap.DecodeAggregator;
 import com.android.bitmap.UnrefedBitmapCache;
-import com.android.bitmap.drawable.BasicBitmapDrawable;
+import com.android.bitmap.drawable.ExtendedBitmapDrawable;
 
 public class MainActivity extends Activity {
+
     private ListView mListView;
+    private final BitmapCache mCache = new UnrefedBitmapCache(TARGET_CACHE_SIZE_BYTES, 0.1f, 0);
+    private final DecodeAggregator mDecodeAggregator = new DecodeAggregator();
 
+    private static Drawable PLACEHOLDER;
+    private static Drawable PROGRESS;
+
+    private static final float NORMAL_PARALLAX_MULTIPLIER = 1.5f;
     private static final int TARGET_CACHE_SIZE_BYTES = 5 * 1024 * 1024;
-    private final BitmapCache mCache = new UnrefedBitmapCache(TARGET_CACHE_SIZE_BYTES, 0.1f, 0);
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        if (PLACEHOLDER == null) {
+            Resources res = getResources();
+            PLACEHOLDER = res.getDrawable(R.drawable.ic_placeholder);
+            PROGRESS = res.getDrawable(R.drawable.progress);
+        }
+
         mListView = (ListView) findViewById(R.id.list);
         mListView.setAdapter(new MyAdapter());
     }
@@ -91,9 +107,13 @@ public class MainActivity extends Activity {
                 v = (BitmapView) convertView;
             } else {
                 v = new BitmapView(MainActivity.this);
-                final BasicBitmapDrawable drawable = new BasicBitmapDrawable(getResources(), mCache,
-                        true /* limit density */);
+                final ExtendedBitmapDrawable drawable = new ExtendedBitmapDrawable(getResources(),
+                        mCache, true /* limit density */, mDecodeAggregator, PLACEHOLDER, PROGRESS);
+                drawable.setParallaxSpeedMultiplier(NORMAL_PARALLAX_MULTIPLIER);
+
                 v.setBasicBitmapDrawable(drawable);
+                v.setListView(mListView);
+                v.setParallaxSpeedMultiplier(NORMAL_PARALLAX_MULTIPLIER);
             }
             v.getBasicBitmapDrawable().bind(new BitmapRequestKeyImpl(mItems[position]));
             return v;