Improving content margin on tablets and using support library dimensions for everything possible.

Ref #404.

src/main/java/com/nutomic/syncthingandroid/fragments/FolderFragment.java

@@ -4,13 +4,6 @@ import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
-import android.graphics.Color;
-import android.graphics.PorterDuff;
-import android.graphics.drawable.BitmapDrawable;
-import android.graphics.drawable.Drawable;
-import android.graphics.drawable.DrawableContainer.DrawableContainerState;
-import android.graphics.drawable.StateListDrawable;
-import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
@@ -18,7 +11,6 @@ import android.support.v7.widget.SwitchCompat;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.Log;
-import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -44,7 +36,6 @@ import com.nutomic.syncthingandroid.syncthing.SyncthingService;
 import java.util.ArrayList;
 import java.util.List;
 
-import static android.os.Build.VERSION_CODES.LOLLIPOP;
 import static android.support.v4.view.MarginLayoutParamsCompat.setMarginEnd;
 import static android.support.v4.view.MarginLayoutParamsCompat.setMarginStart;
 import static android.view.Gravity.CENTER_VERTICAL;
@@ -366,8 +357,11 @@ public class FolderFragment extends Fragment
         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(WRAP_CONTENT, dp(48, getActivity()));
         // 72dp margin to align with dividers
         // 4dp additional margin to align with the rest of the items
-        setMarginStart(params, dp(72 + 4, getActivity()));
+        int dividerInset = getResources().getDimensionPixelOffset(R.dimen.material_divider_inset);
-        setMarginEnd(params, dp(16 + 4, getActivity()));
+        int contentInset = getResources().getDimensionPixelOffset(R.dimen.abc_action_bar_content_inset_material);
+        int textPadding = dp(4, getActivity());
+        setMarginStart(params, dividerInset + textPadding);
+        setMarginEnd(params, contentInset + textPadding);
         TextView emptyView = new TextView(mDevicesContainer.getContext());
         emptyView.setGravity(CENTER_VERTICAL);
         emptyView.setText(R.string.devices_list_empty);

src/main/res/drawable/list_divider_inset.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <inset xmlns:android="http://schemas.android.com/apk/res/android"
-    android:insetLeft="72dp">
+    android:insetLeft="@dimen/material_divider_inset">
     <shape>
         <solid android:color="@color/divider" />
         <size android:height="1px" />

src/main/res/layout/fragment_folder.xml

@@ -80,9 +80,8 @@
                 android:id="@+id/versioningKeep"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_marginEnd="16dp"
+                android:layout_marginEnd="@dimen/abc_action_bar_content_inset_material"
-                android:layout_marginRight="16dp"
+                android:layout_marginRight="@dimen/abc_action_bar_content_inset_material"
-                android:text="0"
                 android:textAppearance="@style/TextAppearance.AppCompat.Caption"
                 tools:ignore="HardcodedText" />
         </LinearLayout>

src/main/res/layout/item_device_form.xml

@@ -4,7 +4,7 @@
     style="@style/Widget.Syncthing.TextView.Label.DeviceList"
     android:layout_width="match_parent"
     android:layout_height="48dp"
-    android:layout_marginLeft="72dp"
+    android:layout_marginLeft="@dimen/material_divider_inset"
-    android:layout_marginStart="72dp"
+    android:layout_marginStart="@dimen/material_divider_inset"
     android:textAppearance="@style/TextAppearance.AppCompat.Caption"
     tools:ignore="RtlHardcoded,RtlSymmetry" />

src/main/res/layout/item_device_list.xml

@@ -4,8 +4,8 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:paddingBottom="8dp"
-    android:paddingLeft="16dp"
+    android:paddingLeft="@dimen/abc_action_bar_content_inset_material"
-    android:paddingRight="16dp"
+    android:paddingRight="@dimen/abc_action_bar_content_inset_material"
     android:paddingTop="8dp">
 
     <TextView

src/main/res/layout/item_folder_list.xml

@@ -4,8 +4,8 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:paddingBottom="8dp"
-    android:paddingLeft="16dp"
+    android:paddingLeft="@dimen/abc_action_bar_content_inset_material"
-    android:paddingRight="16dp"
+    android:paddingRight="@dimen/abc_action_bar_content_inset_material"
     android:paddingTop="8dp">
 
     <TextView

src/main/res/values-sw600dp/dimens.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="material_divider_inset">80dp</dimen>
+</resources>

src/main/res/values/dimens.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="material_divider_inset">72dp</dimen>
+</resources>

src/main/res/values/styles.xml

@@ -22,8 +22,8 @@
         <item name="android:gravity">start|center_vertical</item>
         <item name="android:textAppearance">@style/TextAppearance.AppCompat.Body1</item>
         <item name="android:textColor">?attr/editTextColor</item>
-        <item name="android:paddingLeft">16dp</item>
+        <item name="android:paddingLeft">@dimen/abc_action_bar_content_inset_material</item>
-        <item name="android:paddingRight">16dp</item>
+        <item name="android:paddingRight">@dimen/abc_action_bar_content_inset_material</item>
     </style>
 
     <style name="Widget.Syncthing.TextView.Label.DeviceList">