java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.hometools/com.example.hometools.HometoolsActivity

当我尝试运行我的项目时收到错误消息。这是为了大学的任务，这很简单。我相信XML是可以的。java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.hometools/com.example.hometools.HometoolsActivity

让我知道如果你需要其他东西来帮助我，我只是一个初学者。

package com.example.hometools; 
import com.example.hometools.R; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.CheckBox; 

public class HometoolsActivity extends Activity { 

    //Tela Principal 

    Button button1; 
    Button button2; 
    Button button3; 
    Button button4; 
    Button button5; 

    //tinta 
    EditText editText1t1; 
    EditText editText2t1; 
    EditText editText3t1; 
    EditText editText4t1; 
    Button button1t1; 
    Button button2t1; // voltar 

    //piso 
    EditText editText1t2; 
    EditText editText2t2; 
    EditText editText3t2; 
    Button button1t2; 
    Button button2t2; // voltar 

    //btu 
    EditText editText1t3; 
    EditText editText2t3; 
    EditText editText3t3; 
    EditText editText4t3; 
    CheckBox checkBox1t3; 
    Button button1t3; 
    Button button2t3; // voltar 

    //aquecedor 
    EditText editText1t4; 
    EditText editText2t4; 
    EditText editText3t4; 
    EditText editText4t4; 
    EditText editText5t4; 
    EditText editText6t4; 
    Button button1t4; 
    Button button2t4; // voltar 

    //caixa 
    EditText editText1t5; 
    EditText editText2t5; 
    EditText editText3t5; 
    Button button1t5; 
    Button button2t5; // voltar 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
      controlePrincipal(); 
    } 

    public void controlePrincipal() { 
     setContentView(R.layout.activity_hometools); 
     controleTinta(); //controla tinta 
     controlePiso(); //controla piso 
     controleBtu(); // controla btu 
     controleAquecedor(); // controla aquecedor 
     controleCaixa(); // controla caixa 
    } 

    public void controleTinta(){ 

     button1 = (Button) findViewById(R.id.button1); 
     button1.setOnClickListener (new OnClickListener() { 

     @Override 
     public void onClick(View arg0){ 

     setContentView(R.layout.tinta); 

       editText1t1 = (EditText) findViewById(R.id.editText1t1); 
       editText2t1 = (EditText) findViewById(R.id.editText2t1); 
       editText3t1 = (EditText) findViewById(R.id.editText3t1); 
       editText4t1 = (EditText) findViewById(R.id.editText4t1); 
       button1t1 = (Button) findViewById(R.id.button1t1); 

       button1t1.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 

         double rendimento, quantidade,demao, area, valor_arred; 

         //entrada de dados 
         area=Double.parseDouble(editText1t1.getText().toString()) ; 
         demao=Double.parseDouble(editText2t1.getText().toString()); 
         rendimento=Double.parseDouble(editText3t1.getText().toString()); 



         quantidade = area*demao/rendimento; 

         quantidade = quantidade*1.1; 

         //arredondando o valor para cima 

         valor_arred = Math.ceil(quantidade); 

           //saída de dados 

         editText4t1.setText(String.valueOf(valor_arred)); 
        } 
       }); 
       button2t1.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 
         controlePrincipal(); 
        } 
       }); 

    } 
     }); 
    } 

    public void controlePiso(){ 

     button2 = (Button) findViewById(R.id.button2); 
     button2.setOnClickListener (new OnClickListener() { 

     @Override 
     public void onClick(View arg0){ 

     setContentView(R.layout.piso); 

       editText1t2 = (EditText) findViewById(R.id.editText1t2); 
       editText2t2 = (EditText) findViewById(R.id.editText2t2); 
       editText3t2 = (EditText) findViewById(R.id.editText3t2); 
       button1t2 = (Button) findViewById(R.id.button1t2); 

       button1t2.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 

         double area, tamanho, piso, valor_arred; 

         //entrada de dados 
         area=Double.parseDouble(editText1t2.getText().toString()) ; 
         tamanho=Double.parseDouble(editText2t2.getText().toString()); 



         piso=area/tamanho; 
         piso=piso*1.1; 

         //arredondando o valor para cima. 

         valor_arred = Math.ceil(piso); 
                 //saída de dados 

         editText3t2.setText(String.valueOf(valor_arred)); 
        } 
       }); 
       button2t2.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 
         controlePrincipal(); 
        } 
       }); 
     } 
     }); 

    } 
    public void controleBtu(){ 

     button3 = (Button) findViewById(R.id.button3); 
     button3.setOnClickListener (new OnClickListener() { 

     @Override 
     public void onClick(View arg0){ 

     setContentView(R.layout.btu); 

     editText1t3 = (EditText) findViewById(R.id.editText1t3); 
     editText2t3 = (EditText) findViewById(R.id.editText2t3); 
     editText3t3 = (EditText) findViewById(R.id.editText3t3); 
     editText4t3 = (EditText) findViewById(R.id.editText4t3); 
     button1t3 = (Button) findViewById(R.id.button1t3); 
     checkBox1t3 = (CheckBox) findViewById(R.id.checkBox1t3); 

       button1t3.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 

         double area, valor_arred, BTU; 
         int pessoas, eletronicos; 


         //entrada de dados 
         area=Double.parseDouble(editText1t3.getText().toString()) ; 
         pessoas=Integer.parseInt(editText2t3.getText().toString()); 
         eletronicos=Integer.parseInt(editText3t3.getText().toString()); 


           //saída de dados 
         if (checkBox1t3.isChecked()) { 
         BTU=area*800+pessoas*800+eletronicos*800; 
         } 
         else { 
          BTU=area*600+pessoas*600+eletronicos*600; 
        } 
         valor_arred=Math.ceil(BTU); 

         editText4t3.setText(String.valueOf(valor_arred)); 
        } 
       }); 
       button2t3.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 
         controlePrincipal(); 
        } 
       }); 
     } 
     }); 

    } 

    public void controleAquecedor(){ 

     button4 = (Button) findViewById(R.id.button4); 
     button4.setOnClickListener (new OnClickListener() { 

     @Override 
     public void onClick(View arg0){ 

     setContentView(R.layout.aquecedor); 

     editText1t4 = (EditText) findViewById(R.id.editText1t4); 
     editText2t4 = (EditText) findViewById(R.id.editText2t4); 
     editText3t4 = (EditText) findViewById(R.id.editText3t4); 
     editText4t4 = (EditText) findViewById(R.id.editText4t4); 
     editText5t4 = (EditText) findViewById(R.id.editText5t4); 
     editText6t4 = (EditText) findViewById(R.id.editText6t4); 
     button1t4 = (Button) findViewById(R.id.button1t4); 


       button1t4.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 

         int a,b,c,d; 
         double qnec,vazao,vazaoaq,quant,quantarr; 

         //entrada de dados 

         a=Integer.parseInt(editText1t4.getText().toString()) ; 
         b=Integer.parseInt(editText2t4.getText().toString()) ; 
         c=Integer.parseInt(editText3t4.getText().toString()) ; 
         d=Integer.parseInt(editText4t4.getText().toString()) ; 
         vazaoaq=Double.parseDouble(editText5t4.getText().toString()) ; 




         vazao=12*a+6*b+9*c+15*d; 
         qnec=vazao/2; 
         quant=qnec/vazaoaq; 
         quantarr=Math.ceil(quant); 

          //saída de dados 

         editText6t4.setText(String.valueOf(quantarr)); 
       } 
       }); 
       button2t4.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 
         controlePrincipal(); 
        } 
       }); 
     } 
     }); 

    } 

    public void controleCaixa(){ 

     button1t5 = (Button) findViewById(R.id.button1t5); 
     button1t5.setOnClickListener (new OnClickListener() { 

     @Override 
     public void onClick(View arg0){ 

     setContentView(R.layout.caixa); 

       editText1t5 = (EditText) findViewById(R.id.editText1t5); 
       editText2t5 = (EditText) findViewById(R.id.editText2t5); 
       editText3t5 = (EditText) findViewById(R.id.editText3t5); 
       button1t5 = (Button) findViewById(R.id.button1t5); 

       button1t5.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 

         double minimo, intervalo, valor_arred; 
         int pessoas; 


         //entrada de dados 
         intervalo=Double.parseDouble(editText1t5.getText().toString()) ; 
         pessoas=Integer.parseInt(editText2t5.getText().toString()); 




         minimo=pessoas*intervalo*150; 

         //arredondando o valor para cima. 

         valor_arred = Math.ceil(minimo); 

         //saída de dados 

         editText3t5.setText(String.valueOf(valor_arred)); 
        } 
       }); 
       button2t5.setOnClickListener(new OnClickListener(){ 
        @Override 
        public void onClick(View arg0){ 
         controlePrincipal(); 
        } 
       }); 

    } 
     }); 
    } 
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/RelativeLayout1" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:gravity="center_horizontal" 
tools:context="${relativePackage}.${activityClass}" > 

<TextView 
    android:id="@+id/textView2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
    android:layout_marginRight="16dp" 
    android:text="Hometools por UVA - 2015" /> 

<Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="57dp" 
    android:text="Tinta" /> 

<Button 
    android:id="@+id/button2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignRight="@+id/button1" 
    android:layout_below="@+id/button1" 
    android:layout_marginTop="37dp" 
    android:text="Piso" /> 

<Button 
    android:id="@+id/button3" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" 
    android:text="BTU" /> 

<Button 
    android:id="@+id/button4" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignLeft="@+id/button3" 
    android:layout_below="@+id/button3" 
    android:layout_marginTop="46dp" 
    android:text="Aquecedor" /> 

<Button 
    android:id="@+id/button5" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/textView2" 
    android:layout_centerHorizontal="true" 
    android:layout_marginBottom="32dp" 
    android:text="Caixa d´água" /> 

</RelativeLayout>

这里是我的logcat：

06-20 14:11:27.560: D/AndroidRuntime(824): Shutting down VM 
06-20 14:11:27.560: W/dalvikvm(824): threadid=1: thread exiting with uncaught exception (group=0xb2a68ba8) 
06-20 14:11:27.580: E/AndroidRuntime(824): FATAL EXCEPTION: main 
06-20 14:11:27.580: E/AndroidRuntime(824): Process: com.example.hometools, PID: 824 
06-20 14:11:27.580: E/AndroidRuntime(824): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hometools/com.example.hometools.HometoolsActivity}: java.lang.NullPointerException 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread.access$800(ActivityThread.java:135) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.os.Handler.dispatchMessage(Handler.java:102) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.os.Looper.loop(Looper.java:136) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread.main(ActivityThread.java:5001) 
06-20 14:11:27.580: E/AndroidRuntime(824): at java.lang.reflect.Method.invokeNative(Native Method) 
06-20 14:11:27.580: E/AndroidRuntime(824): at java.lang.reflect.Method.invoke(Method.java:515) 
06-20 14:11:27.580: E/AndroidRuntime(824): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
06-20 14:11:27.580: E/AndroidRuntime(824): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
06-20 14:11:27.580: E/AndroidRuntime(824): at dalvik.system.NativeStart.main(Native Method) 
06-20 14:11:27.580: E/AndroidRuntime(824): Caused by: java.lang.NullPointerException 
06-20 14:11:27.580: E/AndroidRuntime(824): at com.example.hometools.HometoolsActivity.controleCaixa(HometoolsActivity.java:294) 
06-20 14:11:27.580: E/AndroidRuntime(824): at com.example.hometools.HometoolsActivity.controlePrincipal(HometoolsActivity.java:75) 
06-20 14:11:27.580: E/AndroidRuntime(824): at com.example.hometools.HometoolsActivity.onCreate(HometoolsActivity.java:66) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.Activity.performCreate(Activity.java:5231) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
06-20 14:11:27.580: E/AndroidRuntime(824): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
06-20 14:11:27.580: E/AndroidRuntime(824): ... 11 more 
06-20 14:12:37.752: I/Process(824): Sending signal. PID: 824 SIG: 9

来源

2015-06-20 Bruno

请发表您的活动的布局XML。一个或多个'findViewById（）'可以返回null，从而在启动Activity时引发NullPointerException。 – MadEqua

Post full error log not partial – Pankaj

@Clairvoyant编辑 – Bruno

你的错误就在这里，这是一个简单的拼写错误：

public void controleCaixa(){ 

    button1t5 = (Button) findViewById(R.id.button1t5); 
    button1t5.setOnClickListener (new OnClickListener() {...} 
    ... 
}

应该R.id.button5不R.id.button1t5：

public void controleCaixa(){ 

    button5 = (Button) findViewById(R.id.button5); 
    button5.setOnClickListener (new OnClickListener() {...} 
    ... 
}

查看日志，这是明确的：

产生的原因：显示java.lang.NullPointerException 06-20 14：11：27.580： E/AndroidRuntime（824）：在 com。示例.hometools.HometoolsActivity.controleCaixa（HometoolsActivity.java:294） 06-20 14：11：27.580：E/AndroidRuntime（824）：

来源

2015-06-20 20:11:06 MadEqua

java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.hometools/com.example.hometools.HometoolsActivity

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