ActivityInstrumentation / res / layout /

sample_main.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!--
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  ~ Copyright 2013 The Android Open Source Project
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  ~
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  ~ Licensed under the Apache License, Version 2.0 (the "License");
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  ~ you may not use this file except in compliance with the License.
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  ~ You may obtain a copy of the License at
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  ~
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  ~      http://www.apache.org/licenses/LICENSE-2.0
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  ~
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  ~ Unless required by applicable law or agreed to in writing, software
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  ~ distributed under the License is distributed on an "AS IS" BASIS,
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  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  ~ See the License for the specific language governing permissions and
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  ~ limitations under the License.
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  -->
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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                xmlns:tools="http://schemas.android.com/tools"
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                android:layout_width="match_parent"
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                android:layout_height="match_parent"
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                android:paddingLeft="@dimen/activity_horizontal_margin"
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                android:paddingRight="@dimen/activity_horizontal_margin"
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                android:paddingTop="@dimen/activity_vertical_margin"
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                android:paddingBottom="@dimen/activity_vertical_margin"
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                tools:context=".MainActivity">
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    <TextView
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            android:layout_width="wrap_content"
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            android:layout_height="wrap_content"
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            android:text="@string/instructions"
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            android:id="@+id/instructions"/>
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    <Spinner
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            android:layout_width="wrap_content"
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            android:layout_height="wrap_content"
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            android:id="@+id/spinner"
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            android:layout_below="@+id/instructions"
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            android:layout_centerHorizontal="true"/>
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</RelativeLayout>