Introduce resize mode for AspectRatioFrameLayout.

https://github.com/google/ExoPlayer/issues/1827

Three different modes available: fit (default), fixed_width, fixed_height
Developers need to use wrap_content for the dimension which is not fixed:

app:resize_mode="fixed_width"
android:layout_width="320dp"
android:layout_height="wrap_content"

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135264861

library/src/main/java/com/google/android/exoplayer2/ui/AspectRatioFrameLayout.java

@@ -16,14 +16,30 @@
 package com.google.android.exoplayer2.ui;
 
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.util.AttributeSet;
 import android.widget.FrameLayout;
 
+import com.google.android.exoplayer2.R;
+
 /**
  * A {@link FrameLayout} that resizes itself to match a specified aspect ratio.
  */
 public final class AspectRatioFrameLayout extends FrameLayout {
 
+  /**
+   * Either the width or height is decreased to obtain the desired aspect ratio.
+   */
+  public static final int RESIZE_MODE_FIT = 0;
+  /**
+   * The width is fixed and the height is increased or decreased to obtain the desired aspect ratio.
+   */
+  public static final int RESIZE_MODE_FIXED_WIDTH = 1;
+  /**
+   * The height is fixed and the width is increased or decreased to obtain the desired aspect ratio.
+   */
+  public static final int RESIZE_MODE_FIXED_HEIGHT = 2;
+
   /**
    * The {@link FrameLayout} will not resize itself if the fractional difference between its natural
    * aspect ratio and the requested aspect ratio falls below this threshold.
@@ -36,13 +52,24 @@ public final class AspectRatioFrameLayout extends FrameLayout {
   private static final float MAX_ASPECT_RATIO_DEFORMATION_FRACTION = 0.01f;
 
   private float videoAspectRatio;
+  private int resizeMode;
 
   public AspectRatioFrameLayout(Context context) {
-    super(context);
+    this(context, null);
   }
 
   public AspectRatioFrameLayout(Context context, AttributeSet attrs) {
     super(context, attrs);
+    resizeMode = RESIZE_MODE_FIT;
+    if (attrs != null) {
+      TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
+          R.styleable.AspectRatioFrameLayout, 0, 0);
+      try {
+        resizeMode = a.getInt(R.styleable.AspectRatioFrameLayout_resize_mode, RESIZE_MODE_FIT);
+      } finally {
+        a.recycle();
+      }
+    }
   }
 
   /**
@@ -57,6 +84,19 @@ public final class AspectRatioFrameLayout extends FrameLayout {
     }
   }
 
+  /**
+   * Sets the resize mode which can be of value {@link #RESIZE_MODE_FIT},
+   * {@link #RESIZE_MODE_FIXED_HEIGHT} or {@link #RESIZE_MODE_FIXED_WIDTH}.
+   *
+   * @param resizeMode The resize mode.
+   */
+  public void setResizeMode(int resizeMode) {
+    if (this.resizeMode != resizeMode) {
+      this.resizeMode = resizeMode;
+      requestLayout();
+    }
+  }
+
   @Override
   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
@@ -74,10 +114,20 @@ public final class AspectRatioFrameLayout extends FrameLayout {
       return;
     }
 
-    if (aspectDeformation > 0) {
-      height = (int) (width / videoAspectRatio);
-    } else {
-      width = (int) (height * videoAspectRatio);
+    switch (resizeMode) {
+      case RESIZE_MODE_FIXED_WIDTH:
+        height = (int) (width / videoAspectRatio);
+        break;
+      case RESIZE_MODE_FIXED_HEIGHT:
+        width = (int) (height * videoAspectRatio);
+        break;
+      default:
+        if (aspectDeformation > 0) {
+          height = (int) (width / videoAspectRatio);
+        } else {
+          width = (int) (height * videoAspectRatio);
+        }
+        break;
     }
     super.onMeasure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
         MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));

library/src/main/java/com/google/android/exoplayer2/ui/SimpleExoPlayerView.java

@@ -63,6 +63,7 @@ public final class SimpleExoPlayerView extends FrameLayout {
     super(context, attrs, defStyleAttr);
 
     boolean useTextureView = false;
+    int resizeMode = AspectRatioFrameLayout.RESIZE_MODE_FIT;
     if (attrs != null) {
       TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
           R.styleable.SimpleExoPlayerView, 0, 0);
@@ -70,6 +71,8 @@ public final class SimpleExoPlayerView extends FrameLayout {
         useController = a.getBoolean(R.styleable.SimpleExoPlayerView_use_controller, useController);
         useTextureView = a.getBoolean(R.styleable.SimpleExoPlayerView_use_texture_view,
             useTextureView);
+        resizeMode = a.getInt(R.styleable.SimpleExoPlayerView_resize_mode,
+            AspectRatioFrameLayout.RESIZE_MODE_FIT);
       } finally {
         a.recycle();
       }
@@ -78,6 +81,7 @@ public final class SimpleExoPlayerView extends FrameLayout {
     LayoutInflater.from(context).inflate(R.layout.exo_simple_player_view, this);
     componentListener = new ComponentListener();
     layout = (AspectRatioFrameLayout) findViewById(R.id.video_frame);
+    layout.setResizeMode(resizeMode);
     controller = (PlaybackControlView) findViewById(R.id.control);
     shutterView = findViewById(R.id.shutter);
     subtitleLayout = (SubtitleView) findViewById(R.id.subtitles);
@@ -147,6 +151,17 @@ public final class SimpleExoPlayerView extends FrameLayout {
     }
   }
 
+  /**
+   * Sets the resize mode which can be of value {@link AspectRatioFrameLayout#RESIZE_MODE_FIT},
+   * {@link AspectRatioFrameLayout#RESIZE_MODE_FIXED_HEIGHT} or
+   * {@link AspectRatioFrameLayout#RESIZE_MODE_FIXED_WIDTH}.
+   *
+   * @param resizeMode The resize mode.
+   */
+  public void setResizeMode(int resizeMode) {
+    layout.setResizeMode(resizeMode);
+  }
+
   /**
    * Set the {@link PlaybackControlView.VisibilityListener}.
    *

library/src/main/res/values/attrs.xml

@@ -14,8 +14,21 @@
      limitations under the License.
 -->
 <resources>
+
+  <attr name="resize_mode" format="enum">
+    <enum name="fit" value="0"/>
+    <enum name="fixed_width" value="1"/>
+    <enum name="fixed_height" value="2"/>
+  </attr>
+
   <declare-styleable name="SimpleExoPlayerView">
     <attr name="use_controller" format="boolean"/>
     <attr name="use_texture_view" format="boolean"/>
+    <attr name="resize_mode"/>
   </declare-styleable>
+
+  <declare-styleable name="AspectRatioFrameLayout">
+    <attr name="resize_mode"/>
+  </declare-styleable>
+
 </resources>