Allow launching of ExoPlayer demo app via adb shell.

For example:
adb shell am start -a com.google.android.exoplayer.demo.action.VIEW -d http://...

demo/src/main/AndroidManifest.xml

@@ -41,9 +41,20 @@
     </activity>
 
     <activity android:name="com.google.android.exoplayer.demo.PlayerActivity"
-        android:configChanges="keyboardHidden|orientation|screenSize"
+        android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
+        android:launchMode="singleInstance"
         android:label="@string/application_name"
-        android:theme="@style/PlayerTheme"/>
+        android:theme="@style/PlayerTheme">
+      <intent-filter>
+        <action android:name="com.google.android.exoplayer.demo.action.VIEW"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <data android:scheme="http"/>
+        <data android:scheme="https"/>
+        <data android:scheme="content"/>
+        <data android:scheme="asset"/>
+        <data android:scheme="file"/>
+      </intent-filter>
+    </activity>
 
   </application>
 

demo/src/main/java/com/google/android/exoplayer/demo/PlayerActivity.java

@@ -78,13 +78,19 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
     DemoPlayer.Listener, DemoPlayer.CaptionListener, DemoPlayer.Id3MetadataListener,
     AudioCapabilitiesReceiver.Listener {
 
+  // For use within demo app code.
+  public static final String CONTENT_ID_EXTRA = "content_id";
+  public static final String CONTENT_TYPE_EXTRA = "content_type";
   public static final int TYPE_DASH = 0;
   public static final int TYPE_SS = 1;
   public static final int TYPE_HLS = 2;
   public static final int TYPE_OTHER = 3;
 
-  public static final String CONTENT_TYPE_EXTRA = "content_type";
-  public static final String CONTENT_ID_EXTRA = "content_id";
+  // For use when launching the demo app using adb.
+  private static final String CONTENT_EXT_EXTRA = "type";
+  private static final String EXT_DASH = ".mpd";
+  private static final String EXT_SS = ".ism";
+  private static final String EXT_HLS = ".m3u8";
 
   private static final String TAG = "PlayerActivity";
   private static final int MENU_GROUP_TRACKS = 1;
@@ -129,11 +135,6 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
 
-    Intent intent = getIntent();
-    contentUri = intent.getData();
-    contentType = intent.getIntExtra(CONTENT_TYPE_EXTRA, -1);
-    contentId = intent.getStringExtra(CONTENT_ID_EXTRA);
-
     setContentView(R.layout.player_activity);
     View root = findViewById(R.id.root);
     root.setOnTouchListener(new OnTouchListener() {
@@ -186,8 +187,20 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
   }
 
   @Override
+  public void onNewIntent(Intent intent) {
+    releasePlayer();
+    playerPosition = 0;
+    setIntent(intent);
+  }
+
+  @Override
   public void onResume() {
     super.onResume();
+    Intent intent = getIntent();
+    contentUri = intent.getData();
+    contentType = intent.getIntExtra(CONTENT_TYPE_EXTRA,
+        inferContentType(contentUri, intent.getStringExtra(CONTENT_EXT_EXTRA)));
+    contentId = intent.getStringExtra(CONTENT_ID_EXTRA);
     configureSubtitleView();
     if (player == null) {
       preparePlayer(true);
@@ -597,4 +610,28 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
     return CaptionStyleCompat.createFromCaptionStyle(captioningManager.getUserStyle());
   }
 
+  /**
+   * Makes a best guess to infer the type from a media {@link Uri} and an optional overriding file
+   * extension.
+   *
+   * @param uri The {@link Uri} of the media.
+   * @param fileExtension An overriding file extension.
+   * @return The inferred type.
+   */
+  private static int inferContentType(Uri uri, String fileExtension) {
+    String lastPathSegment = !TextUtils.isEmpty(fileExtension) ? "." + fileExtension
+        : uri.getLastPathSegment();
+    if (lastPathSegment == null) {
+      return TYPE_OTHER;
+    } else if (lastPathSegment.endsWith(EXT_DASH)) {
+      return TYPE_DASH;
+    } else if (lastPathSegment.endsWith(EXT_SS)) {
+      return TYPE_SS;
+    } else if (lastPathSegment.endsWith(EXT_HLS)) {
+      return TYPE_HLS;
+    } else {
+      return TYPE_OTHER;
+    }
+  }
+
 }