Move chunk trigger constants into Chunk.

library/src/main/java/com/google/android/exoplayer/chunk/Chunk.java

@@ -35,6 +35,27 @@ import java.io.IOException;
 public abstract class Chunk implements Loadable {
 
   /**
+   * Value of {@link #trigger} for a load whose reason is unspecified.
+   */
+  public static final int TRIGGER_UNSPECIFIED = 0;
+  /**
+   * Value of {@link #trigger} for a load triggered by an initial format selection.
+   */
+  public static final int TRIGGER_INITIAL = 1;
+  /**
+   * Value of {@link #trigger} for a load triggered by a user initiated format selection.
+   */
+  public static final int TRIGGER_MANUAL = 2;
+  /**
+   * Value of {@link #trigger} for a load triggered by an adaptive format selection.
+   */
+  public static final int TRIGGER_ADAPTIVE = 3;
+  /**
+   * Implementations may define custom {@link #trigger} codes greater than or equal to this value.
+   */
+  public static final int TRIGGER_CUSTOM_BASE = 10000;
+
+  /**
    * The format associated with the data being loaded.
    */
   // TODO: Consider removing this and pushing it down into MediaChunk instead.

library/src/main/java/com/google/android/exoplayer/chunk/FormatEvaluator.java

@@ -26,23 +26,6 @@ import java.util.Random;
 public interface FormatEvaluator {
 
   /**
-   * The trigger for the initial format selection.
-   */
-  static final int TRIGGER_INITIAL = 0;
-  /**
-   * The trigger for a format selection that was triggered by the user.
-   */
-  static final int TRIGGER_MANUAL = 1;
-  /**
-   * The trigger for an adaptive format selection.
-   */
-  static final int TRIGGER_ADAPTIVE = 2;
-  /**
-   * Implementations may define custom trigger codes greater than or equal to this value.
-   */
-  static final int TRIGGER_CUSTOM_BASE = 10000;
-
-  /**
    * Enables the evaluator.
    */
   void enable();
@@ -93,7 +76,7 @@ public interface FormatEvaluator {
     public Format format;
 
     public Evaluation() {
-      trigger = TRIGGER_INITIAL;
+      trigger = Chunk.TRIGGER_INITIAL;
     }
 
   }
@@ -147,7 +130,7 @@ public interface FormatEvaluator {
         Format[] formats, Evaluation evaluation) {
       Format newFormat = formats[random.nextInt(formats.length)];
       if (evaluation.format != null && !evaluation.format.id.equals(newFormat.id)) {
-        evaluation.trigger = TRIGGER_ADAPTIVE;
+        evaluation.trigger = Chunk.TRIGGER_ADAPTIVE;
       }
       evaluation.format = newFormat;
     }
@@ -268,7 +251,7 @@ public interface FormatEvaluator {
         ideal = current;
       }
       if (current != null && ideal != current) {
-        evaluation.trigger = FormatEvaluator.TRIGGER_ADAPTIVE;
+        evaluation.trigger = Chunk.TRIGGER_ADAPTIVE;
       }
       evaluation.format = ideal;
     }