I am trying to make a length converter app and my confusion is how do I get my work done to convert from one unit to another unit using two spinners and a calculate button? The issue I have is that I cannot figure out how to convert the unit in the drop down list from one spinner to another unit in the second spinner. I also need to display the answer after the user enters the number and picks the units from the list.
This is my layout file of my main activity
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
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"
tools:context="com.example.unitconverter.MainActivity">
<Button
android:text="WEIGHT"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:onClick=""
android:layout_below="@+id/lengthButton"
android:layout_alignRight="@+id/lengthButton"
android:layout_alignEnd="@+id/lengthButton"
android:id="@+id/weightButton"
tools:ignore="HardcodedText" />
<Button
android:text="LENGTH"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lengthButton"
android:layout_marginTop="164dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
tools:ignore="HardcodedText" />
<TextView
android:text="Unit Converter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="76dp"
android:id="@+id/textView"
android:textSize="36sp"
android:textColor="@android:color/background_dark"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:text="VOLUME"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/volumeButton"
tools:ignore="HardcodedText"
android:layout_below="@+id/weightButton"
android:layout_alignLeft="@+id/weightButton"
android:layout_alignStart="@+id/weightButton" />
<Button
android:text="TEMPERATURE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/temperatureButton"
tools:ignore="HardcodedText"
android:layout_below="@+id/volumeButton"
android:layout_centerHorizontal="true" />
This is the java portion of my main activity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button lengthbtn = (Button) findViewById(R.id.lengthButton);
lengthbtn.setOnClickListener(new OnClickListener(){
public void onClick(View v){
startActivity(new Intent(MainActivity.this, lengthActivity.class));
}
});
Button weightbtn = (Button) findViewById(R.id.weightButton);
weightbtn.setOnClickListener(new OnClickListener(){
public void onClick(View v){
startActivity(new Intent(MainActivity.this, weightActivity.class));
}
});
Button volumebtn = (Button) findViewById(R.id.volumeButton);
volumebtn.setOnClickListener(new OnClickListener(){
public void onClick(View v){
startActivity(new Intent(MainActivity.this,volumeActivity.class));
}
});
Button temperaturebtn = (Button) findViewById(R.id.temperatureButton);
temperaturebtn.setOnClickListener(new OnClickListener(){
public void onClick(View v){
startActivity(new Intent(MainActivity.this,temperatureActivity.class));
}
});
}
}
This is my length layout file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_length"
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"
tools:context="com.example.unitconverter.lengthActivity">
<Spinner
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:id="@+id/lengthList2"
android:textAlignment="center"
android:layout_marginLeft="11dp"
android:layout_marginStart="11dp"
android:layout_below="@+id/convertToTextView"
android:layout_alignLeft="@+id/convertToTextView"
android:layout_alignStart="@+id/convertToTextView" />
<TextView
android:text="Length Converter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="@style/TextAppearance.AppCompat.Display2"
android:textSize="36sp"
android:textAlignment="inherit"
android:id="@+id/lengthTextView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="25dp"
android:layout_marginStart="25dp" />
<Button
android:text="Calculate"
android:id="@+id/calculateButton"
android:layout_width="100dp"
android:layout_height="45dp"
android:layout_marginTop="53dp"
android:layout_below="@+id/lengthList2"
android:layout_alignRight="@+id/lengthList2"
android:layout_alignEnd="@+id/lengthList2"
android:layout_marginRight="23dp"
android:layout_marginEnd="23dp"
android:textAlignment="center" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/resultTextView"
android:text="Result "
android:textSize="20sp"
android:layout_marginBottom="34dp"
android:layout_alignParentBottom="true"
android:layout_alignLeft="@+id/lengthList2"
android:layout_alignStart="@+id/lengthList2" />
<TextView
android:text="Convert to:"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp"
android:layout_marginTop="114dp"
android:id="@+id/convertToTextView"
android:layout_below="@+id/convertEditText"
android:layout_alignLeft="@+id/convertEditText"
android:layout_alignStart="@+id/convertEditText" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:text="Convert from"
android:ems="10"
android:id="@+id/convertEditText"
android:layout_below="@+id/lengthTextView"
android:layout_alignLeft="@+id/lengthTextView"
android:layout_alignStart="@+id/lengthTextView"
android:layout_marginLeft="11dp"
android:layout_marginStart="11dp"
android:layout_marginTop="52dp" />
<Spinner
android:layout_height="wrap_content"
android:entries="@array/lengthList"
android:id="@+id/lengthList"
android:layout_width="200dp"
android:layout_marginTop="13dp"
android:layout_below="@+id/convertEditText"
android:layout_centerHorizontal="true" />
This is what I have for my main activity length file. Can anyone please help me?
public class lengthActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate (saved Instance State);
setContentView(R.layout.activity_length);
final Spinner group = (Spinner)findViewById(R.id.lengthList);
final Spinner group2 = (Spinner)findViewById(R.id.lengthList2);
Button button = (Button)findViewById(R.id.calculateButton);
button.setOnClickListener(new View.OnClickListener() {
final TextView result = ((TextView)
@Override
public void onClick(View v) {
}
