add more stubs to make exoplayer not crash

src/api-impl/android/media/AudioAttributes.java

@@ -1,4 +1,19 @@
 package android.media;
 
 public class AudioAttributes {
+
+	public int getFlags() {return 0;}
+
+	public int getUsage() {return 0;}
+
+	public class Builder {
+
+		public Builder setUsage(int usage) {
+			return this;
+		}
+
+		public AudioAttributes build() {
+			return new AudioAttributes();
+		}
+	}
 }