Question

(Android Studio) (Mobile App Development)

Create a spinner that has drop down function on it (NOT tab view). Place a scroll bar inside the dropdown of the spinner. The categories inside the spinner include: vegetable, fruit, meat, drink. Clicking on each section will pop up a fragment section below. Here, I clicked on the vegetable section, which leads me to a page displaying vegetables and their expiration dates.

Note: Post XML and Java codes for both the main activity and the fragments. You only need to create the vegetable fragment, I code the rest based on the vegetable fragment. Do not screenshot the code, please write out the code.

Choose a category:

Answer 1

activity_main.xml

<?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: layout_width =" match_parent"

android: layout_height ="match_parent"

android:orientation = "vertical"

android:weightSum = "3"

tools:context = ".MainActivity">

<LinearLayout

android:layout_width ="match_ parent"

android:layout_ height = "0dp"

android:layout_weight = "1"

android: orientation = "vertical"

android: weightSum = "2"

>

<TextView

android:layout_width = "match_ parent"

android: layout_height = "wrap_content"

android: layout_weight = "1"

android: text = "Choose Category"

android: gravity = "center"

android:textStyle ="bold" android:textSize= "20sp"

/>

<Spinner

android:id = " @+id/spinner"

android:layout_width = "match_parent"

android:layout_height = "36dp"

android:layout_weight= "1"/>

</LinearLayout>

<FrameLayout>

android: id = "@+id/myFrame"

android: layout_width = "match_parent"

android:layout_height ="0dp"

android:layout_weight = "2">

</FrameLayout>

</LinearLayout>

MainActivity.java

public class MainActivity extends Activity{

String[] categories = {"choose category","vegetables","fruit","meat","drink"};

private Spinner mSpinner;

private String Select;

private FragmentManager mFragManager; private FragmentTransaction mFragTransaction; private VegiFragment mVegfragment;

private DrinkFragment mDrinkFragment; private Fruit fragment mFruitFragment; private MeatFragment mMeatFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mVegFragment = new VegiFragment(); mDrinkFragment = new DrinkFragment(): mMeatFragment = new MeatFragment();

mFruitFragment = new FruitFragment():

mSpinner = (Spinner)findViewById(R.id.spinner);

mFragManager = getFragmentManager();

ArrayAdapter<String> dataAdapter = new ArrayAdapter<>(this,android.R.id.simple_spinner_item, categories);

dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

mSpinner.setAdapter( dataAdapter);

mSpinner.setOnItemSelectedListener(

new AdapterView.OnItemSelectedListner(){

@Override

public void onItmeSelected( AdapterView<?> arg0, View arg1, int arg2, long arg3){

int position = mSpinner.getSelectedItemPosition();

Select = categories [+position];

if( Select == "vegetables"){

if(mFragManager.findFragmentById(R.id.myFrame)== null){

mFragTransaction = mFragManager.beginTransaction();

mFragTransaction.add(R.id.myFrame, mVegFragment);

mFragTransaction.commit();

}

if(mMeatFragment.isResumed()||mDrinkFragment.isResumed()||mFruitFragment.isResumed()){

mFragTransaction = mFragManager.beginTransaction();

mFragTransaction.replace(R.id.myFrame,mmVegFragment);

mFragmentTransaction.commit();}}

if(Select == "meat"){

mFragTransaction = mFragManager.beginTransaction();

if(mVegFragment.isResumed()||mFruitFragment.isResumed()||mDrinkFragment.isResumed()){

mFragTransaction.replace(R.id.myFrame, mMeatFragment);}

mFragmentTransaction.commit();}

// Do same for fruit and drink

}

}

@Override

public void on nothing selected(AdapterView<?> arg0){});

}}