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ユーザーの惑星重量を計算するために、1 つのアプリケーションで 2 つのビューを使用しようとしています。Javaを数回書き直した後、ようやく機能するようになりました...ほとんどの場合、パブリッククラスの惑星では、「パブリックタイプの惑星は独自のファイルで定義する必要があります」と表示されます。私はマニフェストに入り、そのためのアクティビティを作成しましたが、それは何の助けにもなりませんでした. Planets は、既に私の xml ファイルの 1 つの名前です。public 型を独自のファイルにするにはどうすればよいですか?

activity_main.xml:

<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" >

<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" />

<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" />

<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" />

</RelativeLayout>

Planets.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/planetTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/planet" />

<TextView
    android:id="@+id/textViewform2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="" />

<RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <RadioButton
        android:id="@+id/mercuryRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="@string/mercury" />

    <RadioButton
        android:id="@+id/venusRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/venus" />

    <RadioButton
        android:id="@+id/earthRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/earth" />

    <RadioButton
        android:id="@+id/marsRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="@string/mars" />

    <RadioButton
        android:id="@+id/jupiterRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/jupiter" />

    <RadioButton
        android:id="@+id/saturnRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/saturn" />

    <RadioButton
        android:id="@+id/uranusRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="@string/uranus" />

    <RadioButton
        android:id="@+id/neptuneRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/neptune" />

    <RadioButton
        android:id="@+id/plutoRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/pluto" />
</RadioGroup>


<Button
    android:id="@+id/selectButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="buttonclick2"
    android:text="@string/select" />

<TextView
    android:id="@+id/textViewform2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
     />

</LinearLayout

ジャワ:

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();
}
}

マニフェスト:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.deitel.planetaryweight"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="Planets" android:label="@string/title_planets"></activity>
</application>

</manifest>
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1 に答える 1

8

Java ファイルの名前は MainActivity.java (ファイルが定義するパブリック クラスの名前) です。そこから Planets クラスを削除し、そのクラスを Planets.java ファイルに入れます。これは、Java が望んでいることとほとんど同じです。

于 2012-11-15T20:35:44.537 に答える