Fixed overlapping captions.

library/src/main/java/com/google/android/exoplayer/text/CuePainter.java

@@ -51,12 +51,6 @@ import android.util.Log;
    */
   private static final float LINE_HEIGHT_FRACTION = 0.0533f;
 
-  /**
-   * The default bottom padding to apply when {@link Cue#line} is {@link Cue#UNSET_VALUE}, as a
-   * fraction of the viewport height.
-   */
-  private static final float DEFAULT_BOTTOM_PADDING_FRACTION = 0.08f;
-
   /**
    * Temporary rectangle used for computing line bounds.
    */
@@ -82,6 +76,8 @@ import android.util.Log;
   private int windowColor;
   private int edgeColor;
   private int edgeType;
+  private float fontScale;
+  private float bottomPaddingFraction;
   private int parentLeft;
   private int parentTop;
   private int parentRight;
@@ -127,14 +123,16 @@ import android.util.Log;
    * @param cue The cue to draw.
    * @param style The style to use when drawing the cue text.
    * @param fontScale The font scale.
+   * @param bottomPaddingFraction The bottom padding fraction to apply when {@link Cue#line} is
+   *     {@link Cue#UNSET_VALUE}, as a fraction of the viewport height
    * @param canvas The canvas into which to draw.
    * @param cueBoxLeft The left position of the enclosing cue box.
    * @param cueBoxTop The top position of the enclosing cue box.
    * @param cueBoxRight The right position of the enclosing cue box.
    * @param cueBoxBottom The bottom position of the enclosing cue box.
    */
-  public void draw(Cue cue, CaptionStyleCompat style, float fontScale, Canvas canvas,
+  public void draw(Cue cue, CaptionStyleCompat style, float fontScale, float bottomPaddingFraction,
-      int cueBoxLeft, int cueBoxTop, int cueBoxRight, int cueBoxBottom) {
+      Canvas canvas, int cueBoxLeft, int cueBoxTop, int cueBoxRight, int cueBoxBottom) {
     if (TextUtils.isEmpty(cue.text)) {
       // Nothing to draw.
       return;
@@ -149,6 +147,8 @@ import android.util.Log;
         && edgeType == style.edgeType
         && edgeColor == style.edgeColor
         && Util.areEqual(textPaint.getTypeface(), style.typeface)
+        && this.fontScale == fontScale
+        && this.bottomPaddingFraction == bottomPaddingFraction
         && parentLeft == cueBoxLeft
         && parentTop == cueBoxTop
         && parentRight == cueBoxRight
@@ -167,6 +167,8 @@ import android.util.Log;
     edgeType = style.edgeType;
     edgeColor = style.edgeColor;
     textPaint.setTypeface(style.typeface);
+    this.fontScale = fontScale;
+    this.bottomPaddingFraction = bottomPaddingFraction;
     parentLeft = cueBoxLeft;
     parentTop = cueBoxTop;
     parentRight = cueBoxRight;
@@ -199,7 +201,7 @@ import android.util.Log;
     int textLeft = (parentWidth - textWidth) / 2;
     int textRight = textLeft + textWidth;
     int textTop = parentBottom - textHeight
-        - (int) (parentHeight * DEFAULT_BOTTOM_PADDING_FRACTION);
+        - (int) (parentHeight * bottomPaddingFraction);
     int textBottom = textTop + textHeight;
 
     if (cue.position != Cue.UNSET_VALUE) {

library/src/main/java/com/google/android/exoplayer/text/SubtitleLayout.java

@@ -28,11 +28,18 @@ import java.util.List;
  */
 public final class SubtitleLayout extends View {
 
+  /**
+   * The default bottom padding to apply when {@link Cue#line} is {@link Cue#UNSET_VALUE}, as a
+   * fraction of the viewport height.
+   */
+  public static final float DEFAULT_BOTTOM_PADDING_FRACTION = 0.08f;
+
   private final List<CuePainter> painters;
 
   private List<Cue> cues;
   private float fontScale;
   private CaptionStyleCompat style;
+  private float bottomPaddingFraction;
 
   public SubtitleLayout(Context context) {
     this(context, null);
@@ -43,6 +50,7 @@ public final class SubtitleLayout extends View {
     painters = new ArrayList<>();
     fontScale = 1;
     style = CaptionStyleCompat.DEFAULT;
+    bottomPaddingFraction = DEFAULT_BOTTOM_PADDING_FRACTION;
   }
 
   /**
@@ -92,12 +100,27 @@ public final class SubtitleLayout extends View {
     invalidate();
   }
 
+  /**
+   * Sets the bottom padding fraction to apply when {@link Cue#line} is {@link Cue#UNSET_VALUE},
+   * as a fraction of the viewport height.
+   *
+   * @param bottomPaddingFraction The bottom padding fraction.
+   */
+  public void setBottomPaddingFraction(float bottomPaddingFraction) {
+    if (this.bottomPaddingFraction == bottomPaddingFraction) {
+      return;
+    }
+    this.bottomPaddingFraction = bottomPaddingFraction;
+    // Invalidate to trigger drawing.
+    invalidate();
+  }
+
   @Override
   public void dispatchDraw(Canvas canvas) {
     int cueCount = (cues == null) ? 0 : cues.size();
     for (int i = 0; i < cueCount; i++) {
-      painters.get(i).draw(cues.get(i), style, fontScale, canvas, getLeft(), getTop(), getRight(),
+      painters.get(i).draw(cues.get(i), style, fontScale, bottomPaddingFraction, canvas, getLeft(),
-          getBottom());
+          getTop(), getRight(), getBottom());
     }
   }