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MainActivity
intent -> NumbersActivity, FamilyActivity, ColorsActivity, PhraseActivity

package com.example.android.miwok;

import android.support.v7.app.AppCompactActivity;
import android.os.Bundle;

public class MainActivity extends AppCompactActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
}

<application
	android:allowBackup="true"
	android:icon="@mipmap/ic_launcher"
	android:label="Miwok"
	android:supportsRtl="true"
	android:theme="@style/AppTheme" >
	<activity android:name=".MainActivity" >
		<intent-filter>
			<action android:name="android.intent.action.MAIN" />

			<category android:name="android.intent.category.LAUNCHER" />
		</intent-filter>
	</activity>
	<activity android:name=".NumbersActivity" >
	</activity>
	<activity android:name=".FamilyActivity" >
	</activity>
	<activity android:name=".ColorsActivity" >
	</activity>
	<activity android:name=".PhrasesActivity" >
	</activity>
</application>

Navigate to other activities: intent

Miwok app to start off
app / src / main / res / layout / activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2016 The Android Open Source Project
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
          http://www.apache.org/licenses/LICENSE-2.0
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/tan_background"
    android:orientation="vertical"
    tools:context="com.example.android.miwok.MainActivity">

    <TextView
        android:id="@+id/numbers"
        style="@style/CategoryStyle"
        android:background="@color/category_numbers"
        android:text="@string/category_numbers" />

    <TextView
        android:id="@+id/family"
        style="@style/CategoryStyle"
        android:background="@color/category_family"
        android:text="@string/category_family" />

    <TextView
        android:id="@+id/colors"
        style="@style/CategoryStyle"
        android:background="@color/category_colors"
        android:text="@string/category_colors" />

    <TextView
        android:id="@+id/phrases"
        style="@style/CategoryStyle"
        android:background="@color/category_phrases"
        android:text="@string/category_phrases" />

</LinearLayout>

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.miwok;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set the content of the activity to use the activity_main.xml layout file
        setContentView(R.layout.activity_main);
    }
}