基本电话接听与拨打功能完成

contacts/src/main/res/layout/activity_settings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:orientation="vertical"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent">
+
+	<androidx.appcompat.widget.Toolbar
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:id="@+id/activitymainToolbar1"/>
+
+	<LinearLayout
+		android:orientation="vertical"
+		android:layout_width="match_parent"
+		android:layout_height="0dp"
+		android:layout_weight="1.0">
+
+		<LinearLayout
+			android:orientation="horizontal"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:gravity="right">
+
+			<Button
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:text="悬浮窗设置"
+				android:id="@+id/activitysettingsButton2"
+				android:onClick="onCanDrawOverlays"/>
+
+			<Button
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:text="默认拨号设置"
+				android:id="@+id/activitysettingsButton1"
+				android:onClick="onDefaultPhone"/>
+
+		</LinearLayout>
+
+	</LinearLayout>
+
+</LinearLayout>
+