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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_marginTop="16dp"
    android:layout_marginLeft="16dp"
    android:id="@+id/custom_list_item"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:text="lutti"
        android:id="@+id/miwok_text_view"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        tools:text="one"
        android:id="@+id/default_text_view"/>

</LinearLayout>

package com.example.android.miwok;

import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by rober on 12/31/2017.
 */

public class WordAdapter extends ArrayAdapter<Word> {
    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View listItemView = convertView;
        if(listItemView == null){
            listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
        }

        // Get the {@link AndroidWord} object located at this position in the list
        Word currentAndroiWord = getItem(position);

        // Find the TextView in the list_item.xml layout with the ID version_name
        TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
        // Get the version name from the current AndroidWord object and
        // set this text on the name TextView
        miwokTextView.setText(currentAndroiWord.getMiwokTranslation());

        // Find the TextView in the list_item.xml layout with the ID version_number
        TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view);
        // Get the version number from the current AndroidWord object and
        // set this text on the number TextView
        defaultTextView.setText(currentAndroiWord.getDefaultTranslation());


        return listItemView;
        //return super.getView(position, convertView, parent);
    }

    public WordAdapter(Activity context, Word[] words){

        super(context, 0, words);
    }
}

<?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" />

    <TextView
        android:id="@+id/body"
        android:layout_width="match_parent"
        android:layout_height="81dp"
        android:autoText="false"
        android:background="@android:color/darker_gray"
        android:gravity="center_vertical|fill_vertical|center_horizontal"
        android:text="@string/category_body"
        android:textAppearance="@style/TextAppearance.AppCompat.Display1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.android.miwok.BodyActivity">

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toTopOf="@+id/editText"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Name"
        app:layout_constraintBottom_toTopOf="@+id/btn1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/progressBar" />
</android.support.constraint.ConstraintLayout>

<?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.
-->
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/numberView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.android.miwok.NumbersActivity">

</ListView>

/*
 * 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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.lang.reflect.Array;
import java.util.Arrays;

public class NumbersActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // this part is pre-added to set which xml file acts as layout for this activity
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_numbers);

        // just create an array of words
        String[] words = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
                "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty"}; // new String[10];

        // this uses a method to save memory by recycling views and only load the views that are visible, it means, on-demand
        ArrayAdapter<String> itemAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, words);
        ListView listView = (ListView) findViewById(R.id.numberView);
        listView.setAdapter(itemAdapter);

        // this commented code display a list in a linear layout but should only be used if we won't need to scroll to see more items
        /*LinearLayout numberView = (LinearLayout) findViewById(R.id.numberView);

        for (String word: words) {
            TextView text = new TextView(this);
            text.setText(word);
            numberView.addView(text);
        }*/
    }
}

package com.example.android.miwok;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class BodyActivity extends AppCompatActivity {

    private int plus = 0;

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


        // sets a onclick event on a button. Objects are searched by their id usin "R.id.objectId"
        Button btn1 = (Button)findViewById(R.id.btn1);
        btn1.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {

               // callImplicitIntent();
                Log.v("BodyActivity", "current plus value is " + plus);
                ++plus;
            }
        });

    }

    public void callImplicitIntent(){
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_SEND);
        intent.setType("text/plain");

        if(intent.resolveActivity(getPackageManager()) != null){
            startActivity(intent);
        }
    }
}

<?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.
-->
<resources>
    <!-- Primary color of the app (shown in the app bar) -->
    <color name="primary_color">#4A312A</color>

    <!-- Primary dark color of the app (shown in the status bar) -->
    <color name="primary_dark_color">#2F1D1A</color>

    <!-- Background color for app -->
    <color name="tan_background">#fff7da</color>

    <!-- Background color for the numbers category -->
    <color name="category_numbers">#FD8E09</color>

    <!-- Background color for the family members category -->
    <color name="category_family">#379237</color>

    <!-- Background color for the colors category -->
    <color name="category_colors">#8800A0</color>

    <!-- Background color for the phrases category -->
    <color name="category_phrases">#16AFCA</color>
</resources>

<!-- 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.
-->
<resources>
    <!-- Title for the application. [CHAR LIMIT=12] -->
    <string name="app_name">Miwok</string>

    <!-- Category name for phrases [CHAR LIMIT=20] -->
    <string name="category_phrases">Phrases</string>

    <!-- Category name for the vocabulary words for colors [CHAR LIMIT=20] -->
    <string name="category_colors">Colors</string>

    <!-- Category name for the vocabulary words for numbers [CHAR LIMIT=20] -->
    <string name="category_numbers">Numbers</string>

    <!-- Category name for the vocabulary words for family members [CHAR LIMIT=20] -->
    <string name="category_family">Family Members</string>

    <string name="category_body">Body</string>
</resources>

<?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.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.miwok">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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"
            android:label="@string/category_numbers"
            android:parentActivityName=".MainActivity">

            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
        <activity
            android:name=".FamilyActivity"
            android:label="@string/category_family"
            android:parentActivityName=".MainActivity">

            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
        <activity
            android:name=".ColorsActivity"
            android:label="@string/category_colors"
            android:parentActivityName=".MainActivity">

            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
        <activity
            android:name=".PhrasesActivity"
            android:label="@string/category_phrases"
            android:parentActivityName=".MainActivity">

            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
        <activity
            android:name=".BodyActivity"
            android:label="@string/category_body"
            android:parentActivityName=".MainActivity">
            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
    </application>

</manifest>

/*
 * 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.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.TextureView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

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);

        // Find the View that shows the numbers category
        TextView numbers = (TextView) findViewById(R.id.numbers);

        // Set a click listener on that View
        numbers.setOnClickListener(new OnClickListener() {
            // The code in this method will be executed when the numbers category is clicked on.
            @Override
            public void onClick(View view) {
                // Create a new intent to open the {@link NumbersActivity}
                Intent numbersIntent = new Intent(MainActivity.this, NumbersActivity.class);

                // Start the new activity
                startActivity(numbersIntent);
            }
        });

        // Find the View that shows the family category
        TextView family = (TextView) findViewById(R.id.family);

        // Set a click listener on that View
        family.setOnClickListener(new OnClickListener() {
            // The code in this method will be executed when the family category is clicked on.
            @Override
            public void onClick(View view) {
                // Create a new intent to open the {@link FamilyActivity}
                Intent familyIntent = new Intent(MainActivity.this, FamilyActivity.class);

                // Start the new activity
                startActivity(familyIntent);
            }
        });

        // Find the View that shows the colors category
        TextView colors = (TextView) findViewById(R.id.colors);

        // Set a click listener on that View
        colors.setOnClickListener(new OnClickListener() {
            // The code in this method will be executed when the colors category is clicked on.
            @Override
            public void onClick(View view) {
                // Create a new intent to open the {@link ColorsActivity}
                Intent colorsIntent = new Intent(MainActivity.this, ColorsActivity.class);

                // Start the new activity
                startActivity(colorsIntent);
            }
        });

        // Find the View that shows the phrases category
        TextView phrases = (TextView) findViewById(R.id.phrases);

        // Set a click listener on that View
        phrases.setOnClickListener(new OnClickListener() {
            // The code in this method will be executed when the phrases category is clicked on.
            @Override
            public void onClick(View view) {
                // Create a new intent to open the {@link PhrasesActivity}
                Intent phrasesIntent = new Intent(MainActivity.this, PhrasesActivity.class);

                // Start the new activity
                startActivity(phrasesIntent);
            }
        });

        TextView body = (TextView) findViewById(R.id.body);
        body.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent bodyIntent = new Intent(MainActivity.this, BodyActivity.class);

                startActivity(bodyIntent);
            }

        });
    }
}