Add arrow icon callback on MyTagsActivity

app/src/main/java/com/hippo/ehviewer/ui/MyTagsActivity.java

@@ -20,6 +20,7 @@ import android.annotation.SuppressLint;
 import android.graphics.Bitmap;
 import android.os.Build;
 import android.os.Bundle;
+import android.view.MenuItem;
 import android.view.View;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
@@ -77,6 +78,17 @@ public class MyTagsActivity extends ToolbarActivity {
     progress = findViewById(R.id.progress);
   }
 
+  @Override
+  public boolean onOptionsItemSelected(MenuItem item) {
+    switch (item.getItemId()) {
+      case android.R.id.home:
+        finish();
+        return true;
+      default:
+        return super.onOptionsItemSelected(item);
+    }
+  }
+
   private class MyTagsWebViewClient extends WebViewClient {
     @Override
     public boolean shouldOverrideUrlLoading(WebView view, String url) {