2014-03-05 49 views
1

我正在計算器,但啓動後,當我按下計算器的任何按鈕(0,1,2等)。我不幸計算器停止工作。在logcat中得到錯誤..我在哪裏缺乏?計算器:錯誤沒有這樣的文件或目錄,跳過幀

CODE:

package com.example.calculator; 

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

public class Calculator extends Activity implements OnClickListener { 

    String initialnum="0"; 
    TextView textview; 
    char operator=' '; 
    int result; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_calculator); 

     TextView textview= (TextView) findViewById(R.id.textView1); 
     textview.setText("0"); 


     ((Button) findViewById(R.id.button00)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button01)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button02)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button03)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button04)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button05)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button06)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button07)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button08)).setOnClickListener(this); 
     ((Button) findViewById(R.id.button09)).setOnClickListener(this);    
     ((Button) findViewById(R.id.buttonc)).setOnClickListener(this); 
     ((Button) findViewById(R.id.buttondivide)).setOnClickListener(this); 
     ((Button) findViewById(R.id.buttonequal)).setOnClickListener(this); 
     ((Button) findViewById(R.id.buttonminus)).setOnClickListener(this); 
     ((Button) findViewById(R.id.buttonmultiply)).setOnClickListener(this); 
     ((Button) findViewById(R.id.buttonplus)).setOnClickListener(this); 

    } 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     switch (v.getId()) { 

     case R.id.button00: 
     case R.id.button01: 
     case R.id.button02: 
     case R.id.button03: 
     case R.id.button04: 
     case R.id.button05: 
     case R.id.button06: 
     case R.id.button07: 
     case R.id.button08: 
     case R.id.button09: 

     String digit= ((Button) v).getText().toString(); 
     if (initialnum.equals("0")) { 
      initialnum= digit;  
     } else { 
      initialnum +=digit; 
     } 
     textview.setText(initialnum); 

     if (operator == '=') { 
      result= 0; 
      operator=' '; 
     } break; 

     case R.id.buttonc: 
      result=0; 
      operator=' '; 

     case R.id.buttondivide: 
      compute(); 
      operator='/'; 
      break; 

     case R.id.buttonminus: 
      compute(); 
      operator='-'; 
      break; 

     case R.id.buttonmultiply: 
      compute(); 
      operator='*'; 
      break; 

     case R.id.buttonplus: 
      compute(); 
      operator='+'; 
      break; 

     case R.id.buttonequal: 
      compute(); 
      operator='='; 
      break; 
     } 

    } 

    private void compute() { 
     int number= Integer.parseInt(initialnum); 
     // TODO Auto-generated method stub 
     if (operator==' ') { 
      result= number; 
     } else if (operator=='+') { 
      result+= number; 
     }else if (operator=='-') { 
      result-= number; 
     }else if (operator=='*') { 
      result*= number; 
     } else if (operator=='/') { 
      result/= number;     
      } 
     textview.setText(result); 
     } 

} 

錯誤日誌:

03-05 13:10:52.539: E/Trace(805): error opening trace file: No such file or directory (2) 
03-05 13:10:53.359: I/Choreographer(805): Skipped 55 frames! The application may be doing too much work on its main thread. 
03-05 13:10:53.399: D/gralloc_goldfish(805): Emulator without GPU emulation detected. 
03-05 13:14:46.659: D/AndroidRuntime(805): Shutting down VM 
03-05 13:14:46.669: W/dalvikvm(805): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 
03-05 13:14:46.699: E/AndroidRuntime(805): FATAL EXCEPTION: main 
03-05 13:14:46.699: E/AndroidRuntime(805): java.lang.NullPointerException 
03-05 13:14:46.699: E/AndroidRuntime(805): at com.example.calculator.Calculator.onClick(Calculator.java:64) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.view.View.performClick(View.java:4084) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.view.View$PerformClick.run(View.java:16966) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.os.Handler.handleCallback(Handler.java:615) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.os.Looper.loop(Looper.java:137) 
03-05 13:14:46.699: E/AndroidRuntime(805): at android.app.ActivityThread.main(ActivityThread.java:4745) 
03-05 13:14:46.699: E/AndroidRuntime(805): at java.lang.reflect.Method.invokeNative(Native Method) 
03-05 13:14:46.699: E/AndroidRuntime(805): at java.lang.reflect.Method.invoke(Method.java:511) 
03-05 13:14:46.699: E/AndroidRuntime(805): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
03-05 13:14:46.699: E/AndroidRuntime(805): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
03-05 13:14:46.699: E/AndroidRuntime(805): at dalvik.system.NativeStart.main(Native Method) 

佈局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/LinearLayout1" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:layout_marginTop="10dp" 
android:gravity="right|top" 
android:orientation="vertical" > 






<TextView 
    android:id="@+id/textView1" 
    android:layout_width="match_parent" 
    android:layout_height="50dp" 
    android:layout_marginTop="10dp" 
    android:background="#cccccc" 
    android:gravity="right" 
    android:paddingTop="10dp" 
    android:text="TextView" 
    android:textSize="25dp" /> 


<TableLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_weight="0.50" 
    android:layout_marginTop="10dp" > 

    <TableRow 
     android:id="@+id/tableRow1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" > 




     <Button 
      android:id="@+id/button07" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="7" /> 




     <Button 
      android:id="@+id/button08" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="8" /> 



     <Button 
      android:id="@+id/button09" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="9" /> 



     <Button 
      android:id="@+id/buttondivide" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="/" /> 

    </TableRow> 

    <TableRow 
     android:id="@+id/tableRow2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" > 




     <Button 
      android:id="@+id/button04" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="4" /> 




     <Button 
      android:id="@+id/button05" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="5" /> 




     <Button 
      android:id="@+id/button06" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="6" /> 



     <Button 
      android:id="@+id/buttonmultiply" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="*" /> 

    </TableRow> 

    <TableRow 
     android:id="@+id/tableRow3" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" > 




     <Button 
      android:id="@+id/button01" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="1" /> 




     <Button 
      android:id="@+id/button02" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="2" /> 




     <Button 
      android:id="@+id/button03" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="3" /> 



     <Button 
      android:id="@+id/buttonminus" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="-" /> 

    </TableRow> 

    <TableRow 
     android:id="@+id/tableRow4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" > 




     <Button 
      android:id="@+id/button00" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="0" /> 




     <Button 
      android:id="@+id/buttonc" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="c" /> 




     <Button 
      android:id="@+id/buttonequal" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="=" /> 



     <Button 
      android:id="@+id/buttonplus" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="+" /> 

    </TableRow> 
</TableLayout> 

+0

把你的佈局文件也請... – rajshree

+0

@rajshree:新增佈局file.but我不認爲錯誤是佈局文件。 – apurva

回答

1

你有NullPointerException異常中的onClick方法,因爲TextView的未初始化。

在變化的onCreate此行

TextView textview= (TextView) findViewById(R.id.textView1); 

這樣:

textview= (TextView) findViewById(R.id.textView1); 
+0

它工作。謝謝。 :) – apurva

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