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POPublic class must be defined in its own file
 

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    <p>I am trying to use two views in one application to come up with the user's planetary weight. After rewriting the java several times, I finally have it working... mostly, but on the public class Planets it tells me "The public type planets must be defined in its own file." I went into the manifest and made an activity for it, but that didn't help anything. Planets is already the name of one of my xml files. How do I make the public type into its own file? </p> <p>activity_main.xml: </p> <pre><code>&lt;RelativeLayout 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" &gt; &lt;TextView android:id="@+id/askwtTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="17dp" android:layout_marginTop="19dp" android:text="@string/askwt" /&gt; &lt;EditText android:id="@+id/inputwtEditText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/askwtTextView" android:layout_below="@+id/askwtTextView" android:layout_marginTop="26dp" android:ems="10" android:inputType="numberDecimal" /&gt; &lt;Button android:id="@+id/enterButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/inputwtEditText" android:layout_below="@+id/inputwtEditText" android:layout_marginTop="38dp" android:onClick="buttonclick" android:text="@string/enter" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Planets.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;TextView android:id="@+id/planetTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/planet" /&gt; &lt;TextView android:id="@+id/textViewform2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" /&gt; &lt;RadioGroup android:id="@+id/radioGroup1" android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;RadioButton android:id="@+id/mercuryRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="@string/mercury" /&gt; &lt;RadioButton android:id="@+id/venusRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/venus" /&gt; &lt;RadioButton android:id="@+id/earthRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/earth" /&gt; &lt;RadioButton android:id="@+id/marsRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="@string/mars" /&gt; &lt;RadioButton android:id="@+id/jupiterRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/jupiter" /&gt; &lt;RadioButton android:id="@+id/saturnRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/saturn" /&gt; &lt;RadioButton android:id="@+id/uranusRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="@string/uranus" /&gt; &lt;RadioButton android:id="@+id/neptuneRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/neptune" /&gt; &lt;RadioButton android:id="@+id/plutoRadio" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/pluto" /&gt; &lt;/RadioGroup&gt; &lt;Button android:id="@+id/selectButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="buttonclick2" android:text="@string/select" /&gt; &lt;TextView android:id="@+id/textViewform2" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;/LinearLayout </code></pre> <p>JAVA: </p> <pre><code>package com.deitel.planetaryweight; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.widget.*; import android.view.View; import android.view.Menu; import android.widget.Button; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.EditText; import android.widget.TextView; import java.text.DecimalFormat; public class MainActivity extends Activity { /* You should get used to declaring everything with the correct visibility. Good practice is to make everything private and use public mutator methods */ //Global variable private double weight; private Button enter; // creates a button // Views private EditText wtEntry; private TextView txtForm2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Start with first screen setContentView(R.layout.activity_main); enter = (Button) findViewById(R.id.enterButton); //creates an editext and assigns the resource id of the xml edittext. wtEntry = (EditText)findViewById(R.id.inputwtEditText); txtForm2 = (TextView)findViewById(R.id.textViewform2); } // Button clicks shouldn't do anything but perform clicky actions. Leave field initialization, view creation, etc to the Activity. //buttonclick for form 1 public void buttonclick(View view){ //Receives the input from the edittext, converts it to a double (number). weight = Double.parseDouble(wtEntry.getText().toString()); TextView t2 = null; //change the value of the textview on screen 2 to the calculation value t2.setText(Double.toString(weight)); // If you want a new layout, it's best to start a new activity. // It looks like you want to get information back, so use startActivityForResult(). // setContentView(R.layout.planets); Intent dataIntent = new Intent(this, Planets.class); dataIntent.putExtra("com.deitel.identifier.DATA_WEIGHT", weight); startActivityForResult(dataIntent, Activity.RESULT_OK); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); // Check that the resultCode is the same as we started the activity with if(resultCode == Activity.RESULT_OK){ // get the double from the Intent, using the same string name (package prefixed) // or a default value if it didn't get set. double resultWeight = data.getDoubleExtra("com.deitel.identifier.RESULT_WEIGHT", 0.0); // Now do something with resultWeight } } } // PlanetChooser.class public class Planets extends Activity { // constants, usually denoted by uppercase and declared static and final public static final double MERCURYFORCE = 0.38; public static final double VENUSFORCE = 0.91; public static final double EARTHFORCE = 1.00; public static final double MARSFORCE = 0.38; public static final double JUPITERFORCE = 2.34; public static final double SATURNFORCE = 1.06; public static final double URANUSFORCE = 0.92; public static final double NEPTUNEFORCE = 1.19; public static final double PLUTOFORCE = 0.06; private RadioButton mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, pluto; // No need to use the Double object as opposed to the primitive unless you have good reason private double mercurypf, venuspf, earthpf, marspf, jupiterpf, saturnpf, uranuspf, neptunepf, plutopf, weight; // One variable will suffice, it seems. private double resultForce; public void onCreate(Bundle s){ super.onCreate(s); setContentView(R.layout.planets); mercury = (RadioButton) findViewById(R.id.mercuryRadio); venus = (RadioButton) findViewById(R.id.venusRadio); earth = (RadioButton) findViewById(R.id.earthRadio); mars = (RadioButton) findViewById(R.id.marsRadio); jupiter = (RadioButton) findViewById(R.id.jupiterRadio); saturn = (RadioButton) findViewById(R.id.saturnRadio); uranus = (RadioButton) findViewById(R.id.uranusRadio); neptune = (RadioButton) findViewById(R.id.neptuneRadio); pluto = (RadioButton) findViewById(R.id.plutoRadio); } public void buttonclick2(View view){ /* It looks to me here you're looking to see which box is checked, and set a value based on that planet. Since instance variables (in this case mercurypf, jupiterpf, etc) are initialized to the default value (0), there's no need to set them manually. */ // Code used to determine which planet RadioButton is checked: if(mercury.isChecked()) { resultForce = MERCURYFORCE * weight; } if(venus.isChecked()){ resultForce = VENUSFORCE * weight; } if(earth.isChecked()){ resultForce = EARTHFORCE * weight; } if(mars.isChecked()){ resultForce = MARSFORCE * weight; } if(jupiter.isChecked()){ resultForce =JUPITERFORCE * weight; } if(saturn.isChecked()){ resultForce = SATURNFORCE * weight; } if(uranus.isChecked()){ resultForce = URANUSFORCE * weight; } if(neptune.isChecked()){ resultForce = NEPTUNEFORCE * weight; } if(pluto.isChecked()){ resultForce = PLUTOFORCE * weight; } // Create a new data Intent to pass back to the calling activity, set the result code, // and manually finish() this activity. Intent dataIntent = new Intent(this, null); dataIntent.getDoubleExtra("com.deitel.identifier.RESULT_DATA", resultForce); setResult(Activity.RESULT_OK, dataIntent); finish(); } } </code></pre> <p>Manifest:</p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.deitel.planetaryweight" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".MainActivity" android:label="@string/title_activity_main" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name="Planets" android:label="@string/title_planets"&gt;&lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre>
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