refine the drawer indicator

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -495,10 +495,16 @@ class Shadowsocks
     menuAdapter.setListener(this)
     listView.setAdapter(menuAdapter)
     drawer.setMenuView(listView)
-    // The drawable that replaces the up indicator in the action bar
-    drawer.setSlideDrawable(R.drawable.ic_drawer)
-    // Whether the previous drawable should be shown
-    drawer.setDrawerIndicatorEnabled(true)
+
+    if (Utils.isLollipopOrAbove) {
+      drawer.setDrawerIndicatorEnabled(false)
+    } else {
+      // The drawable that replaces the up indicator in the action bar
+      drawer.setSlideDrawable(R.drawable.ic_drawer)
+      // Whether the previous drawable should be shown
+      drawer.setDrawerIndicatorEnabled(true)
+    }
+
     if (!isSinglePane) {
       drawer.openMenu(false)
     }
@@ -518,7 +524,7 @@ class Shadowsocks
       getWindow.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
       getWindow.setStatusBarColor(getResources().getColor(R.color.grey3));
       getActionBar.setDisplayHomeAsUpEnabled(true)
-      getActionBar.setDisplayShowHomeEnabled(false)
+      getActionBar.setHomeAsUpIndicator(R.drawable.ic_drawer)
     } else {
       getActionBar.setIcon(R.drawable.ic_stat_shadowsocks)
     }
@@ -916,13 +922,13 @@ class Shadowsocks
 
   private def showQrCode() {
     val image = new ImageView(this)
+    image.setPadding(0, dp2px(20), 0, dp2px(20))
     image.setLayoutParams(new LinearLayout.LayoutParams(-1, -1))
     val qrcode = QRCode.from(Parser.generate(currentProfile))
       .withSize(dp2px(250), dp2px(250)).asInstanceOf[QRCode]
     image.setImageBitmap(qrcode.bitmap())
 
     new AlertDialog.Builder(this)
-      .setTitle(getString(R.string.qrcode))
       .setCancelable(true)
       .setNegativeButton(getString(R.string.close), new DialogInterface.OnClickListener() {
       override def onClick(dialog: DialogInterface, id: Int) {