К сожалению, «приложение» остановлено

Question

Я новый кодер Android. В этом проекте нет красных линий, но когда я пытаюсь запустить свое приложение, «к сожалению», приложение «Stopped» появляется на экране. Есть немного желтой и фиолетовой линии справа, хотя. вот мой код:

import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.TextView; 


import android.app.Activity; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Spinner; 
import android.widget.AdapterView.OnItemSelectedListener; 
import android.widget.Button; 

public class Translator extends ActionBarActivity { 

    public ArrayAdapter<?> fromLanguageAdapter, toLanguageAdapter, englishAdapter, 
      chineseAdapter, spanishAdapter; 

    public Spinner fromLanguageSpinner = (Spinner) findViewById(R.id.spinner); 
    public Spinner toLanguageSpinner = (Spinner) findViewById(R.id.spinner2); 
    public Spinner phrases = (Spinner) findViewById(R.id.spinner3); 
    public TextView answer = (TextView)findViewById(R.id.answer); 
    public String[][] allPhrases = new String[][]{{"Hello","thank you","you are welcome","goodbye","i love you"}, 
      {"你好","谢谢","不用客气","再见","我爱你"}, 
      {"hola","gracias","bienvenido","adiós","te amo"}}; 
    public Button button = (Button) findViewById(R.id.button); 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_translator); 

     fromLanguageAdapter = ArrayAdapter.createFromResource(this,R.array.fromLanguage, 
       android.R.layout.simple_spinner_item); 
     fromLanguageAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     fromLanguageSpinner.setAdapter(fromLanguageAdapter); 
     fromLanguageSpinner.setOnItemSelectedListener(new languageListener()); 

     toLanguageAdapter = ArrayAdapter.createFromResource(this,R.array.toLanguage, 
       android.R.layout.simple_spinner_item); 
     toLanguageAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     toLanguageSpinner.setAdapter(toLanguageAdapter); 
     button.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       translate(); 
      } 
     }); 
    } 

    public class languageListener implements OnItemSelectedListener{ 
     @Override 
     public void onItemSelected(AdapterView<?> parent, View v, int pos, 
            long id) { 

      //parent.getItemAtPosition(pos); 

      if (pos==0) 
       chooseEnglish(phrases); 
      else if (pos==1) 
       chooseChinese(phrases); 
      else if (pos==2) 
       chooseSpanish(phrases); 
     } 
     @Override 
     public void onNothingSelected(AdapterView<?> arg0) { 
     } 
    } 


    private void chooseEnglish(Spinner spinner){ 
     englishAdapter = ArrayAdapter.createFromResource(this,R.array.englishPhrases, 
       android.R.layout.simple_spinner_item); 
     englishAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     spinner.setAdapter(englishAdapter); 
    } 

    private void chooseChinese(Spinner spinner){ 
     chineseAdapter = ArrayAdapter.createFromResource(this,R.array.chinesePhrases, 
    android.R.layout.simple_spinner_item); 
     chineseAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    spinner.setAdapter(chineseAdapter); 
} 

    private void chooseSpanish(Spinner spinner){ 
     spanishAdapter = ArrayAdapter.createFromResource(this,R.array.spanishPhrases, 
       android.R.layout.simple_spinner_item); 
     spanishAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     spinner.setAdapter(spanishAdapter); 
    } 

    void translate(){ 
     int toLanguagePosition = toLanguageSpinner.getSelectedItemPosition(); 
     int whichPhrase = phrases.getSelectedItemPosition(); 
     answer.setText(allPhrases[toLanguagePosition][whichPhrase]); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_translator, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

и вот файл 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" android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".Translator"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="From:" 
     android:id="@+id/textView" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <Spinner 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/spinner" 
     android:layout_below="@+id/textView" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:spinnerMode="dropdown" 
     android:entries="@array/fromLanguage" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="To:" 
     android:id="@+id/textView2" 
     android:layout_below="@+id/spinner" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <Spinner 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/spinner2" 
     android:layout_below="@+id/textView2" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:entries="@array/toLanguage" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="Phrases:" 
     android:id="@+id/textView5" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_below="@+id/spinner2" /> 

    <Spinner 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/spinner3" 
     android:layout_below="@+id/textView5" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Translate" 
     android:id="@+id/button" 
     android:clickable="true" 
     android:onClick="buttonOnClick" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentEnd="true" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Large Text" 
     android:id="@+id/answer" 
     android:layout_below="@+id/spinner3" 
     android:layout_toLeftOf="@+id/button" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

</RelativeLayout> 

Answer 1

Ваша ошибка, скорее всего, потому, что вы пытаетесь ссылаться на объекты в макете перед setContentView вызова. Попробуйте изменить его на это:

public Spinner fromLanguageSpinner; 
public Spinner toLanguageSpinner; 
public Spinner phrases; 
public TextView answer; 
public String[][] allPhrases = new String[][]{{"Hello","thank you","you are welcome","goodbye","i love you"}, 
     {"你好","谢谢","不用客气","再见","我爱你"}, 
     {"hola","gracias","bienvenido","adiós","te amo"}}; 
public Button button; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_translator); 

fromLanguageSpinner = (Spinner) findViewById(R.id.spinner); 
toLanguageSpinner = (Spinner) findViewById(R.id.spinner2); 
phrases = (Spinner) findViewById(R.id.spinner3); 
answer = (TextView)findViewById(R.id.answer); 
button = (Button) findViewById(R.id.button); 
....