按下按鈕後，結果沒有顯示出來。用於計算提示的Android應用程序

按下按鈕後應用程序崩潰。按下按鈕後，結果沒有顯示出來。用於計算提示的Android應用程序

下面是堆棧跟蹤：

FATAL EXCEPTION: FATAL EXCEPTION: main 
Process: com.example.btyagi.tipcalculator, PID: 8357 
android.content.res.Resources$NotFoundException: String resource ID #0x0 
    at android.content.res.Resources.getText(Resources.java:312) 
    at android.support.v7.widget.ResourcesWrapper.getText(ResourcesWrapper.java:52) 
    at android.widget.TextView.setText(TextView.java:4417) 
    at com.example.btyagi.tipcalculator.MainActivity$1.onClick(MainActivity.java:54) 
    at android.view.View.performClick(View.java:5198) 
    at android.view.View$PerformClick.run(View.java:21147) 
    at android.os.Handler.handleCallback(Handler.java:739) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.app.ActivityThread.main(ActivityThread.java:5417) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

這是我的Activity類：

public class MainActivity extends AppCompatActivity { 
    EditText totalBill; 
    EditText totalTip; 


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


     final EditText checkAmount = (EditText) findViewById(R.id.editText); 
     final EditText noOfPeople = (EditText) findViewById(R.id.editText2); 
     final EditText tipPercent = (EditText) findViewById(R.id.editText3); 

     totalBill = (EditText) findViewById(R.id.editText4); 
     totalTip = (EditText) findViewById(R.id.editText5); 


     //TextView totalPerPerson = (TextView) findViewById(R.id.textView5); 
     //TextView tipPerPerson = (TextView) findViewById(R.id.textView4); 


     Button calculateButton = (Button) findViewById(R.id.button); 
//  ArrayList<String> list = new ArrayList<String>(); 
//  ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,list); 


     // try { 


     calculateButton.setOnClickListener(new View.OnClickListener() { 


      @Override 
      public void onClick(View v) { 
       try { 
        int amount = Integer.parseInt(checkAmount.getText().toString()); 
        int people = Integer.parseInt(noOfPeople.getText().toString()); 
        int tip = Integer.parseInt(tipPercent.getText().toString()); 
        totalBill.setText(new StringBuilder().append(amount).append(tip/100 * amount).toString()); 
        totalTip.setText(tip/100 * amount); 
        // totalPerPerson.setText(totalBill.get/people); 
       } catch (NumberFormatException ed) { 
        System.out.print("Not a number"); 
       } 
      } 
     }); 
// 


    } 
}

XML文件內容：

<?xml version="1.0" encoding="utf-8"?> 
    <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:paddingBottom="@dimen/activity_vertical_margin" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     tools:context="com.example.btyagi.tipcalculator.MainActivity"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="Check Amount" 
      android:id="@+id/textView" 
      android:layout_alignParentTop="true" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_marginTop="78dp" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="No. of People" 
      android:id="@+id/textView2" 
      android:layout_below="@+id/textView" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_marginTop="30dp" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="Tip %" 
      android:id="@+id/textView3" 
      android:layout_below="@+id/textView2" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_marginTop="29dp" /> 

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

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="numberDecimal" 
      android:ems="10" 
      android:id="@+id/editText" 
      android:layout_above="@+id/textView2" 
      android:layout_toRightOf="@+id/textView" 
      android:layout_toEndOf="@+id/textView" /> 

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editText2" 
      android:layout_above="@+id/textView3" 
      android:layout_toRightOf="@+id/textView2" 
      android:layout_toEndOf="@+id/textView2" /> 

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="numberDecimal" 
      android:ems="10" 
      android:id="@+id/editText3" 
      android:layout_above="@+id/button" 
      android:layout_toRightOf="@+id/textView" 
      android:layout_toEndOf="@+id/textView" /> 

     <EditText 
      android:layout_width="100dp" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editText4" 
      android:layout_below="@+id/button" 
      android:layout_alignRight="@+id/editText2" 
      android:layout_alignEnd="@+id/editText2" /> 

     <EditText 
      android:layout_width="100dp" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editText5" 
      android:layout_below="@+id/editText4" 
      android:layout_alignLeft="@+id/editText4" 
      android:layout_alignStart="@+id/editText4" /> 

     <EditText 
      android:layout_width="100dp" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editText6" 
      android:layout_below="@+id/editText5" 
      android:layout_alignRight="@+id/editText" 
      android:layout_alignEnd="@+id/editText" /> 

     <EditText 
      android:layout_width="100dp" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editText7" 
      android:layout_below="@+id/editText6" 
      android:layout_alignRight="@+id/editText6" 
      android:layout_alignEnd="@+id/editText6" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="TipPerPerson" 
      android:id="@+id/textView4" 
      android:layout_alignBottom="@+id/editText7" 
      android:layout_toRightOf="@+id/textView3" 
      android:layout_toEndOf="@+id/textView3" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="TotalPerPerson" 
      android:id="@+id/textView5" 
      android:layout_alignBottom="@+id/editText6" 
      android:layout_alignLeft="@+id/textView4" 
      android:layout_alignStart

來源

2016-01-23 bhavishya tyagi

爲什麼你永遠不會從你的佈局引用你的EditText視圖？這不是用戶輸入值的地方嗎？ –

[TextView中的整數值]的可能重複（http://stackoverflow.com/questions/3994315/integer-value-in-textview） –

A final變量只能初始化一次。

更改您的totalBill，totalTip和totalPerPersonTextView秒（實際上有EditText在你的XML）類變量，並移動amount，people和tip到點擊收聽。

public class MainActivity extends AppCompatActivity { 


    TextView totalBill; 
    TextView totalTip; 
    TextView totalPerPerson; 

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


     TextView checkAmount = (TextView) findViewById(R.id.textView); 
     TextView noOfPeople = (TextView) findViewById(R.id.textView2); 
     TextView tipPercent = (TextView) findViewById(R.id.textView3); 

     totalBill = (TextView) findViewById(R.id.textView7); 
     totalTip = (TextView) findViewById(R.id.textView6); 
     totalPerPerson = (TextView) findViewById(R.id.textView5); 
     TextView tipPerPerson = (TextView) findViewById(R.id.textView4); 


     Button calculateButton = (Button) findViewById(R.id.button); 

     calculateButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       try { 
        int amount = Integer.parseInt(checkAmount.getText().toString()); 
        int people = Integer.parseInt(noOfPeople.getText().toString()); 
        int tip = Integer.parseInt(tipPercent.getText().toString()); 

        totalBill.setText(new StringBuilder().append(amount).append(tip/100 * amount).toString()); 
        totalTip.setText(String.valueOf(tip/100 * amount)); 
        // totalPerPerson.setText(totalBill.get/people); 
       } catch (NumberFormatException ex) { 
        System.out.print("Not a number"); 
       } 
      } 
     }); 

    } 
}

來源

2016-01-23 23:49:05 Rami

非常感謝！我忘了我後來在XML代碼中更改了這些視圖。我相信你的建議可以解決我的問題。 –

我已經在問題中引入了更改，正如您所建議的，但在點擊計算按鈕後應用程序崩潰。 –

您需要將您的int轉換爲* setText（）*方法中的字符串：* String.valueOf（yourInt）*。我已經更新了我的答案。 – Rami

此行

totalTip.setText(tip/100 * amount);

應該說這不是

totalTip.setText(String.valueOf(tip/100 * amount));

原因是在於setText(int resId)是錯誤的方法，將拋出一個Resources$NotFoundException，你得到。

來源

2016-01-24 01:07:33

你明白了！謝謝您的幫助！ –

歡迎。如果此答案解決了您的問題，那麼您可以通過答案左側箭頭下方的複選標記接受此問題。 –

按下按鈕後，結果沒有顯示出來。用於計算提示的Android應用程序

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