Как сделать умножение в android?

-2

В настоящее время я разрабатываю приложение для Android. Сначала у меня не было problelm, но затем, когда я запускаю свой код, страница неожиданно останавливается. во-первых, я запускаю mcpakej1.xml. то после того, как я нажму кнопку «Отправить», не введя значения в текст редактирования, страница перестанет неожиданно. когда я смотрю на ошибку в logcat, ошибка на другой странице. Ниже приведен код.Как сделать умножение в android?

mcpakej1.xml

<?xml version="1.0" encoding="utf-8"?> 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools"> 

<ScrollView 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="150dp" 
     android:layout_height="40dp" 
     android:text="Package A \n" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 

    <TextView 
     android:id="@+id/textView50" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textStyle="bold" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:text="Number of guest(s)"/> 

<EditText 
    android:id="@+id/guest" 
    android:layout_width="fill_parent" 
    android:layout_height="50dp" 
    android:inputType="number" 
    android:textStyle="bold" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:hint="Maximum : 10000" > 

    <requestFocus /> 
</EditText> 

</LinearLayout> 

</ScrollView> 

<ImageButton 
     android:id="@+id/homebtn" 
     android:layout_width="50dp" 
     android:layout_height="50dp" 
     android:layout_alignTop="@+id/homebtn" 
     android:layout_toLeftOf="@+id/homebtn" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
     android:background="@drawable/homebtn" 
     android:onClick="goHome" /> 

<ImageButton 
     android:id="@+id/gobutton" 
     android:layout_width="wrap_content" 
     android:layout_height="50dp" 
     android:layout_alignTop="@+id/homebtn" 
     android:layout_toRightOf="@+id/homebtn" 
    android:layout_alignParentBottom="true" 
     android:background="@drawable/gobutton" 
     android:onClick="goReceipt"/> 

<ImageButton 
     android:id="@+id/backbutton" 
     android:layout_width="50dp" 
     android:layout_height="50dp" 
     android:layout_alignTop="@+id/homebtn" 
    android:layout_alignParentBottom="true" 
     android:layout_toLeftOf="@+id/homebtn" 
     android:background="@drawable/backbutton" 
     android:onClick="goPackage" 
     android:gravity="right"/> 




</RelativeLayout>

это mcpakej1.java

public class mcpakej1 extends Activity 
    { 
private EditText passEditText; 


CheckBox nsPutih,nsBeriyani,nsMinyak,aymKurma,aymLemak,aymKari,aymRendang,aymMerah, 
prtAsam, dggTomato, dggSinggang, dggMerah,kerabuTaugeh, pindangKacang,jelatah,dalcaSayur,papadom, 
kariIkan,ikanMasin, sirapAis, oren,tehTarik,agarAgar, buburKacang,kuih; 

public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mcpakej1); 

    passEditText = (EditText) findViewById(R.id.guest); 


    nsPutih  = (CheckBox) findViewById(R.id.pakejA1); 
    nsBeriyani = (CheckBox) findViewById(R.id.pakejA2); 
    nsMinyak  = (CheckBox) findViewById(R.id.pakejA3); 
    aymKurma  = (CheckBox) findViewById(R.id.pakejA4); 
    aymLemak  = (CheckBox) findViewById(R.id.pakejA5); 
    aymKari  = (CheckBox) findViewById(R.id.pakejA6); 
    aymRendang = (CheckBox) findViewById(R.id.pakejA7); 
    aymMerah  = (CheckBox) findViewById(R.id.pakejA8); 
    prtAsam  = (CheckBox) findViewById(R.id.pakejA9); 
    dggTomato  = (CheckBox) findViewById(R.id.pakejA10); 
    dggSinggang = (CheckBox) findViewById(R.id.pakejA11); 
    dggMerah  = (CheckBox) findViewById(R.id.pakejA12); 
    kerabuTaugeh = (CheckBox) findViewById(R.id.pakejA13); 
    pindangKacang = (CheckBox) findViewById(R.id.pakejA14); 
    jelatah  = (CheckBox) findViewById(R.id.pakejA15); 
    dalcaSayur = (CheckBox) findViewById(R.id.pakejA16); 
    papadom  = (CheckBox) findViewById(R.id.pakejA17); 
    kariIkan  = (CheckBox) findViewById(R.id.pakejA18); 
    ikanMasin  = (CheckBox) findViewById(R.id.pakejA19); 
    sirapAis  = (CheckBox) findViewById(R.id.pakejA20); 
    oren   = (CheckBox) findViewById(R.id.pakejA21); 
    tehTarik  = (CheckBox) findViewById(R.id.pakejA22); 
    agarAgar  = (CheckBox) findViewById(R.id.pakejA23); 
    buburKacang = (CheckBox) findViewById(R.id.pakejA24); 
    kuih   = (CheckBox) findViewById(R.id.pakejA25); 


} 

public void goHome(View v){ 
{ 
    Intent intent = new Intent(v.getContext(), MainActivity.class); 
    startActivityForResult(intent,0);} 
} 

public void goReceipt(View v) 
{ 

    Intent intent = new Intent(v.getContext(), doReceipt.class); 

    intent.putExtra("nsBeriyani", nsBeriyani.isChecked()); 
    intent.putExtra("nsPutih", nsPutih.isChecked()); 
    intent.putExtra("nsMinyak", nsMinyak.isChecked()); 
    intent.putExtra("aymKurma", aymKurma.isChecked()); 
    intent.putExtra("aymKari", aymKari.isChecked()); 
    intent.putExtra("aymRendang", aymRendang.isChecked()); 
    intent.putExtra("aymMerah", aymMerah.isChecked()); 
    intent.putExtra("prtAsam", prtAsam.isChecked()); 
    intent.putExtra("dggTomato", dggTomato.isChecked()); 
    intent.putExtra("dggSinggang", dggSinggang.isChecked()); 
    intent.putExtra("dggMerah", dggMerah.isChecked()); 
    intent.putExtra("kerabuTaugeh", kerabuTaugeh.isChecked()); 
    intent.putExtra("pindangKacang", pindangKacang.isChecked()); 
    intent.putExtra("jelatah", jelatah.isChecked()); 
    intent.putExtra("dalcaSayur", dalcaSayur.isChecked()); 
    intent.putExtra("papadom", papadom.isChecked()); 
    intent.putExtra("kariIkan", kariIkan.isChecked()); 
    intent.putExtra("ikanMasin", ikanMasin.isChecked()); 
    intent.putExtra("sirapAis", sirapAis.isChecked()); 
    intent.putExtra("oren", oren.isChecked()); 
    intent.putExtra("tehTarik", tehTarik.isChecked()); 
    intent.putExtra("agarAgar", agarAgar.isChecked()); 
    intent.putExtra("buburKacang", buburKacang.isChecked()); 
    intent.putExtra("kuih", kuih.isChecked()); 


    findViewById(R.id.gobutton).setOnClickListener(new OnClickListener() 
    { 

     @Override 
     public void onClick(View arg0) 
     { final String pass = passEditText.getText().toString(); 
      if (!isValidPassword(pass)) 
      { 
       passEditText.setError("Invalid Number"); 
      } 
     } 
    }); 
    startActivityForResult(intent,0); 
} 
public void goPackage(View v){ 
    { 
     Intent intent = new Intent(v.getContext(), PackageSelect.class); 
     startActivityForResult(intent,0);} 
    } 

// validating password with retype password 
private boolean isValidPassword(String pass) 
{ 
    if (pass != null && pass.length() <= 10000) { 
     return true; 
    } 
    return false; 
}}

это ошибка, которую я получил в LogCat после щелчка на кнопку отправки.

11-22 10:38:04.434: E/AndroidRuntime(1173):  at dalvik.system.NativeStart.main(Native Method) 
11-22 10:38:04.434: E/AndroidRuntime(1173): Caused by: java.lang.NullPointerException 
11-22 10:38:04.434: E/AndroidRuntime(1173):  at com.example.mobilecatering.doReceipt.onCreate(doReceipt.java:398) 
11-22 10:38:04.434: E/AndroidRuntime(1173):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-22 10:38:04.434: E/AndroidRuntime(1173):  at  android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-22 10:38:04.434: E/AndroidRuntime(1173):  ... 11 more 
11-22 10:38:06.294: I/Process(1173): Sending signal. PID: 1173 SIG: 9

это страница, что состояние ошибки, которая является doReceipt.java

public class doReceipt extends Activity 

{ 
boolean nsPutih, nsBeriyani,nsMinyak,aymKurma,aymLemak,aymKari,aymRendang,aymMerah, 
prtAsam, dggTomato, dggSinggang, dggMerah,kerabuTaugeh, pindangKacang,jelatah,dalcaSayur,papadom, 
kariIkan,ikanMasin, sirapAis, oren,tehTarik,agarAgar, buburKacang,kuih, price; 



TextView tvOutput1,tvOutput2, tvOutput3, tvOutput4, tvOutput5, tvOutput6, tvOutput7, tvOutput8, tvOutput9, tvOutput10, 
tvOutput11, tvOutput12, tvOutput13, tvOutput14, tvOutput15, tvOutput16, tvOutput17, tvOutput18, tvOutput19, tvOutput20, 
tvOutput21, tvOutput22, tvOutput23, tvOutput24, tvOutput25, tvOutput26, tvOutput27, tvOutput28; 

public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.receipt); 

     Bundle extras = getIntent().getExtras(); 
     if (extras == null) { 
      return; 
     } 

     // assign the values to string-arguments 
     String phone = extras.getString("phone"); 

     TextView phoneText = (TextView) findViewById(R.id.textView27);  
     phoneText.setText(phone); 

     tvOutput1 = (TextView) findViewById(R.id.textView1); 
     tvOutput2 = (TextView) findViewById(R.id.textView2); 
     tvOutput3 = (TextView) findViewById(R.id.textView3); 
     tvOutput4 = (TextView) findViewById(R.id.textView4); 
     tvOutput5 = (TextView) findViewById(R.id.textView5); 
     tvOutput6 = (TextView) findViewById(R.id.textView6); 
     tvOutput7 = (TextView) findViewById(R.id.textView7); 
     tvOutput8 = (TextView) findViewById(R.id.textView8); 
     tvOutput9 = (TextView) findViewById(R.id.textView9); 
     tvOutput10 = (TextView) findViewById(R.id.textView10); 
     tvOutput11 = (TextView) findViewById(R.id.textView11); 
     tvOutput12 = (TextView) findViewById(R.id.textView12); 
     tvOutput13 = (TextView) findViewById(R.id.textView13); 
     tvOutput14 = (TextView) findViewById(R.id.textView14); 
     tvOutput15 = (TextView) findViewById(R.id.textView15); 
     tvOutput16 = (TextView) findViewById(R.id.textView16); 
     tvOutput17 = (TextView) findViewById(R.id.textView17); 
     tvOutput18 = (TextView) findViewById(R.id.textView18); 
     tvOutput19 = (TextView) findViewById(R.id.textView19); 
     tvOutput20 = (TextView) findViewById(R.id.textView20); 
     tvOutput21 = (TextView) findViewById(R.id.textView21); 
     tvOutput22 = (TextView) findViewById(R.id.textView22); 
     tvOutput23 = (TextView) findViewById(R.id.textView23); 
     tvOutput24 = (TextView) findViewById(R.id.textView24); 
     tvOutput25 = (TextView) findViewById(R.id.textView25); 
     tvOutput26 = (TextView) findViewById(R.id.textView26); 
     tvOutput27 = (TextView) findViewById(R.id.textView27); 
     tvOutput28 = (TextView) findViewById(R.id.textView28); 


     Bundle data = this.getIntent().getExtras(); 

     nsPutih=data.getBoolean("nsPutih"); 
     nsBeriyani=data.getBoolean("nsBeriyani"); 
     nsMinyak=data.getBoolean("nsMinyak"); 
     aymKurma=data.getBoolean("aymKurma"); 
     aymLemak=data.getBoolean("aymLemak"); 
     aymKari=data.getBoolean("aymKari"); 
     aymRendang=data.getBoolean("aymRendang"); 
     aymMerah=data.getBoolean("aymMerah"); 
     prtAsam=data.getBoolean("prtAsam"); 
     dggTomato=data.getBoolean("dggTomato"); 
     dggSinggang=data.getBoolean("dggSinggang"); 
     dggMerah=data.getBoolean("dggMerah"); 
     kerabuTaugeh=data.getBoolean("kerabuTaugeh"); 
     pindangKacang=data.getBoolean("pindangKacang"); 
     jelatah=data.getBoolean("jelatah"); 
     dalcaSayur=data.getBoolean("dalcaSayur"); 
     papadom=data.getBoolean("papadom"); 
     kariIkan=data.getBoolean("kariIkan"); 
     ikanMasin=data.getBoolean("ikanMasin"); 
     sirapAis=data.getBoolean("sirapAis"); 
     oren=data.getBoolean("oren"); 
     tehTarik=data.getBoolean("tehTarik"); 
     agarAgar=data.getBoolean("agarAgar"); 
     buburKacang=data.getBoolean("buburKacang"); 
     kuih=data.getBoolean("kuih"); 
     price=data.getBoolean("price"); 


     double price = 0; 
    //StringBuffer stringBuffer = new StringBuffer(); 


     if(nsPutih==true) 
     { 

      tvOutput1.setText("Nasi Putih - RM 1.00"); 
      tvOutput1.setVisibility(View.VISIBLE); 
      price+=1; 
     } 
     else 
     { 
      tvOutput1.setVisibility(View.GONE); 
     } 

     if (nsBeriyani==true) 
     { 
      tvOutput2.setText("Nasi Beriyani - RM 2.00"); 
      tvOutput2.setVisibility(View.VISIBLE); 
      price+=2.0; 
     } 
     else 
     { 
      tvOutput2.setVisibility(View.GONE); 
     } 
     if (nsMinyak==true) 
     { 
      tvOutput3.setText("Nasi Minyak - RM 1.50"); 
      tvOutput3.setVisibility(View.VISIBLE); 
      price+=1.5; 
     } 
     else 
     { 
      tvOutput3.setVisibility(View.GONE); 
     } 
     if(aymKurma==true) 
     { 
      tvOutput4.setText("Ayam Masak Kurma - RM 2.00"); 
      tvOutput4.setVisibility(View.VISIBLE); 
      price+=2; 
     } 
     else 
     { 
      tvOutput4.setVisibility(View.GONE); 
     } 
     if (aymLemak==true) 
     { 
      tvOutput5.setText("Ayam Masak Lemak - RM 4.00"); 
      tvOutput5.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput5.setVisibility(View.GONE); 
     } 

     if (aymKari==true) 
     { 
      tvOutput6.setText("Ayam Masak Kari - RM 4.00"); 
      tvOutput6.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput6.setVisibility(View.GONE); 
     } 

     if (aymRendang==true) 
     { 
      tvOutput7.setText("Ayam Masak Rendang - RM 4.00"); 
      tvOutput7.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput7.setVisibility(View.GONE); 
     } 

     if (aymMerah==true) 
     { 
      tvOutput8.setText("Ayam Masak Merah - RM 4.00"); 
      tvOutput8.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput8.setVisibility(View.GONE); 
     } 

     if (prtAsam==true) 
     { 
      tvOutput9.setText("Perut Air Asam - RM 3.00"); 
      tvOutput9.setVisibility(View.VISIBLE); 
      price+=3; 
     } 
     else 
     { 
      tvOutput9.setVisibility(View.GONE); 
     } 

     if (dggTomato==true) 
     { 
      tvOutput10.setText("Daging Masak Tomato - RM 4.00"); 
      tvOutput10.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput10.setVisibility(View.GONE); 
     } 

     if (dggSinggang==true) 
     { 
      tvOutput11.setText("Daging Masak Singgang - RM 4.00"); 
      tvOutput11.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput11.setVisibility(View.GONE); 
     } 

     if (dggMerah==true) 
     { 
      tvOutput12.setText("Daging Masak Merah - RM 4.00"); 
      tvOutput12.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput12.setVisibility(View.GONE); 
     } 

     if (kerabuTaugeh==true) 
     { 
      tvOutput13.setText("Kerabu Taugeh - RM 1.50"); 
      tvOutput13.setVisibility(View.VISIBLE); 
      price+=1.5; 
     } 
     else 
     { 
      tvOutput13.setVisibility(View.GONE); 
     } 

     if (pindangKacang==true) 
     { 
      tvOutput14.setText("Pindang Kacang - RM 1.00"); 
      tvOutput14.setVisibility(View.VISIBLE); 
      price+=1; 
     } 
     else 
     { 
      tvOutput14.setVisibility(View.GONE); 
     } 

     if (jelatah==true) 
     { 
      tvOutput15.setText("Jelatah - RM 2.00"); 
      tvOutput15.setVisibility(View.VISIBLE); 
      price+=2; 
     } 
     else 
     { 
      tvOutput15.setVisibility(View.GONE); 
     } 

     if (dalcaSayur==true) 
     { 
      tvOutput16.setText("Dalca Sayur - RM 1.50"); 
      tvOutput16.setVisibility(View.VISIBLE); 
      price+=1.5; 
     } 
     else 
     { 
      tvOutput16.setVisibility(View.GONE); 
     } 

     if (papadom==true) 
     { 
      tvOutput17.setText("Papadom - RM 0.50"); 
      tvOutput17.setVisibility(View.VISIBLE); 
      price+=0.5; 
     } 
     else 
     { 
      tvOutput17.setVisibility(View.GONE); 
     } 

     if (kariIkan==true) 
     { 
      tvOutput18.setText("Kari Ikan - RM 1.50"); 
      tvOutput18.setVisibility(View.VISIBLE); 
      price+=1.5; 
     } 
     else 
     { 
      tvOutput18.setVisibility(View.GONE); 
     } 

     if (ikanMasin==true) 
     { 
      tvOutput19.setText("Kari Ikan Masin - RM 4.00"); 
      tvOutput19.setVisibility(View.VISIBLE); 
      price+=4; 
     } 
     else 
     { 
      tvOutput19.setVisibility(View.GONE); 
     } 

     if (sirapAis==true) 
     { 
      tvOutput20.setText("Minuman Sejuk - RM 1.50"); 
      tvOutput20.setVisibility(View.VISIBLE); 
      price+=1.5; 
     } 
     else 
     { 
      tvOutput20.setVisibility(View.GONE); 
     } 

     if (oren==true) 
     { 
      tvOutput21.setText("Jus Buah - RM 2.00"); 
      tvOutput21.setVisibility(View.VISIBLE); 
      price+=2; 
     } 
     else 
     { 
      tvOutput21.setVisibility(View.GONE); 
     } 

     if (tehTarik==true) 
     { 
      tvOutput22.setText("Minuman Panas - RM 1.00"); 
      tvOutput22.setVisibility(View.VISIBLE); 
      price+=1.0; 
     } 
     else 
     { 
      tvOutput22.setVisibility(View.GONE); 
     } 

     if (agarAgar==true) 
     { 
      tvOutput23.setText("Agar Agar - RM 1.00"); 
      tvOutput23.setVisibility(View.VISIBLE); 
      price+=1; 
     } 
     else 
     { 
      tvOutput23.setVisibility(View.GONE); 
     } 

     if (buburKacang==true) 
     { 
      tvOutput24.setText("Bubur Kacang - RM 2.50"); 
      tvOutput24.setVisibility(View.VISIBLE); 
      price+=2.5; 
     } 
     else 
     { 
      tvOutput24.setVisibility(View.GONE); 
     } 

     if (kuih==true) 
     { 
      tvOutput25.setText("Kuih Muih - RM 1.00"); 
      tvOutput25.setVisibility(View.VISIBLE); 
      price+=1; 
     } 
     else 
     { 
      tvOutput25.setVisibility(View.GONE); 
     } 

     Log.e("MENU PAKEJ A","Total Price: RM "+ price); 
     String stringdouble = Double.toString(price); 
     tvOutput26.setText("\n\n Price Per Person : RM "+ stringdouble); 


     double e1 = Double.parseDouble(stringdouble.toString()); 
     double e2 = Double.parseDouble(phone.toString()); <!-- the error line --> 

      tvOutput28.setText("Total price for all guest(s) : RM " + String.valueOf(e1*e2)); 

    } 
public void goHome(View v){ 
    { 
     Intent intent = new Intent(v.getContext(), MainActivity.class); 
     startActivityForResult(intent,0);} 
    } 
public void goPackage(View v){ 
    { 
     Intent intent = new Intent(v.getContext(), mcpakej1.class); 
     startActivityForResult(intent,0);} 
    } 
public void goOrder(View v){ 
    { 
     Intent intent = new Intent(v.getContext(), OrderProcess.class); 
     startActivityForResult(intent,0);} 
    } 

}

источник

2014-11-08 Cik Husna

какая ошибка это показывает? – Piyush

Попробуйте что-то вроде этого:

tvOutput4.setText("Multiplication Result is: " +String.valueOf(e1*e2)); 
tvOutput4.setVisibility(View.VISIBLE);

источник

2014-11-08 08:42:13

Надеюсь, это может вам помочь! –

спасибо ... это действительно помогает мне .... :) –

жаль беспокоить вас. может у меня помочь? Я реализовал ваш код и его просто отлично работает. но сейчас я пытался запустить свой код. страница неожиданно останавливается. Я обновил свой вопрос ... пожалуйста, помогите мне. –

Как сделать умножение в android?

ответ

Смежные вопросы