无法解析MainActivityBinding并绑定相关问题

我想制作一个科学计算器。无法解析MainActivityBinding并绑定相关问题

我发现本网站上的一些有用的代码：http://www.androidauthority.com/build-a-calculator-app-721910/

然后我修改为我的目的。在此代码我发现采用装订方法，所以我提出在我的IDE以下变化按照本网站上的操作的指令：https://developer.android.com/topic/libraries/data-binding/index.html

我提出在的build.gradle（模块的应用程序）的变化和所做的更改我MainActivity.java代码也是。

但出现以下错误：

MainActivity.java

package com.example.anant.scientificcalculator; 

import android.databinding.DataBindingUtil; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import static java.lang.Math.*; 
import java.text.DecimalFormat; 
//import com.example.anant.scientificcalculator.databinding.MainActivityBinding; 
//import android.content.DialogInterface; 
//import android.text.TextUtils; 
//import android.view.View; 
//import android.widget.Button; 
//import android.widget.EditText; 
//import android.widget.TextView; 


public class MainActivity extends AppCompatActivity { 

private MainActivityBinding binding; //error in this line cannot resolve MainActivityBinding. 

private static final char FACT = '!'; 
private static final char POWER = '^'; 
private static final String SQRT = "SQRT"; 

private static final String SIN = "SIN"; 
private static final String COS = "COS"; 
private static final String TAN = "TAN"; 
private static final String LOG = "LOG"; 

private static final char LEFTC = '('; 
private static final char RIGHTC = ')'; 
private static final String EXP = "EXP"; 
private static final String PIE = "PIE"; 

private static final char ADD = '+'; 
private static final char SUBTRACT = '-'; 
private static final char MULTIPlY = '*'; 
private static final char DIVIDE = '/'; 

private char CURRENT_ACTION; 
private String ADVANCE_ACTION; 

private double valueOne = Double.NaN; 
private double valueTwo; 

private DecimalFormat decimalFormat; 

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

    decimalFormat = new DecimalFormat("#.##########"); 

    MainActivityBinding binding = DataBindingUtil.setContentView(this, R.layout.main_activity); 

    //error in all the lines below saying cannot resolve button-----(where ---- denotes the specific terms of the button) 

    binding.buttonDot.setOnClickListener(new View.OnClickListener(){ 
     @Override 
       public void onClick(View view){ 
        binding.editText.setText(binding.editText.getText() + "."); 
     } 
    }); 

    binding.buttonZero.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
      public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "0"); 
     } 
    }); 

    binding.buttonOne.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "1"); 
     } 
    }); 

    binding.buttonTwo.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "2"); 
     } 
    }); 

    binding.buttonThree.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "3"); 
     } 
    }); 

    binding.buttonFour.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "4"); 
     } 
    }); 

    binding.buttonFive.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "5"); 
     } 
    }); 

    binding.buttonSix.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "6"); 
     } 
    }); 

    binding.buttonSeven.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "7"); 
     } 
    }); 

    binding.buttonEight.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "8"); 
     } 
    }); 

    binding.buttonNine.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "9"); 
     } 
    }); 

    binding.buttonLeftC.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + "("); 
     } 
    }); 

    binding.buttonRightC.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      binding.editText.setText(binding.editText.getText() + ")"); 
     } 
    }); 

    binding.buttonExp.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      computeCalculation(); 
      ADVANCE_ACTION = EXP; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "EXP"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonPie.setOnCLickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View view){ 
      computeCalculation(); 
      ADVANCE_ACTION = PIE; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "PIE"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonAdd.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = ADD; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "+"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonSubtract.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = SUBTRACT; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "-"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonMultiply.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = MULTIPlY; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "*"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonDivide.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = DIVIDE; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "/"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonFact.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = FACT; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "!"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonPow.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      CURRENT_ACTION = POWER; 
      binding.infoTextView.setText(decimalFormat.format(valueOne) + "^"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonSqrt.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      ADVANCE_ACTION = SQRT; 
      binding.infoTextView.setText("SQRT(" + decimalFormat.format(valueOne) + ")"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonSine.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      ADVANCE_ACTION = SIN; 
      binding.infoTextView.setText("SIN(" + decimalFormat.format(valueOne) + ")"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonCosine.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      ADVANCE_ACTION = COS; 
      binding.infoTextView.setText("COS(" + decimalFormat.format(valueOne) + ")"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonTangent.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      ADVANCE_ACTION = TAN; 
      binding.infoTextView.setText("TAN(" + decimalFormat.format(valueOne) + ")"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonLog.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      ADVANCE_ACTION = LOG; 
      binding.infoTextView.setText("LOG(" + decimalFormat.format(valueOne) + ")"); 
      binding.editText.setText(null); 
     } 
    }); 

    binding.buttonEqual.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      computeCalculation(); 
      binding.infoTextView.setText(binding.infoTextView.getText().toString() + 
        decimalFormat.format(valueTwo) + " = " + decimalFormat.format(valueOne)); 
      valueOne = Double.NaN; 
      CURRENT_ACTION = '0'; 
     } 
    }); 

    binding.buttonClear.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if(binding.editText.getText().length() > 0) { 
       CharSequence currentText = binding.editText.getText(); 
       binding.editText.setText(currentText.subSequence(0, currentText.length()-1)); 
      } 
      else { 
       valueOne = Double.NaN; 
       valueTwo = Double.NaN; 
       binding.editText.setText(""); 
       binding.infoTextView.setText(""); 
      } 
     } 
    }); 

} 

private void computeCalculation() { 
    if(!Double.isNaN(valueOne)) { 
     valueTwo = Double.parseDouble(binding.editText.getText().toString()); 
     binding.editText.setText(null); 

     if(CURRENT_ACTION == ADD) 
      valueOne = this.valueOne + valueTwo; 
     else if(CURRENT_ACTION == SUBTRACT) 
      valueOne = this.valueOne - valueTwo; 
     else if(CURRENT_ACTION == MULTIPlY) 
      valueOne = this.valueOne * valueTwo; 
     else if(CURRENT_ACTION == DIVIDE) 
      valueOne = this.valueOne/valueTwo; 
     else if(CURRENT_ACTION == FACT) 
     { 
      int i,valueThree = 1; 
      for(i=(int) valueOne;i>0;i--) //type conversion 
      { 
       valueThree *= i; 
      } 
     } 
     else if(CURRENT_ACTION == POWER) 
      valueOne = Math.pow(valueOne,valueTwo); 
     else if(ADVANCE_ACTION == SQRT) 
      valueOne = Math.sqrt(valueOne); 
     else if(ADVANCE_ACTION == SIN) 
      valueOne = Math.sin(valueOne); 
     else if(ADVANCE_ACTION == COS) 
      valueOne = Math.cos(valueOne); 
     else if(ADVANCE_ACTION == TAN) 
      valueOne = Math.tan(valueOne); 
     else if(ADVANCE_ACTION == LOG) 
      valueOne = Math.log(valueOne); 
     else if(ADVANCE_ACTION == PIE) 
      valueOne = Math.PI; 
     else if(ADVANCE_ACTION == EXP) 
      valueOne = Math.E; 
    } 
    else { 
     try { 
      valueOne = Double.parseDouble(binding.editText.getText().toString()); 
     } 
     catch (Exception e){} 
    } 
}

}

这是我的xml文件

main_activity.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" 
android:id="@+id/main_activity" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.example.anant.scientificcalculator.MainActivity"> 


<TextView 
    android:id="@+id/infoTextView" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="30dp" 
    android:textSize="30sp" /> 

<EditText 
    android:id="@+id/editText" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/infoTextView" 
    android:enabled="false" 
    android:gravity="bottom" 
    android:hint="0" 
    android:inputType="numberDecimal" 
    android:lines="2" 
    android:maxLines="2" 
    android:textAlignment="textEnd" 
    android:textColor="@android:color/black" 
    android:textSize="40sp" /> 

<Button 
    android:id="@+id/buttonFact" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/editText" 
    android:text="@string/buttonFact" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonPow" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/editText" 
    android:layout_toRightOf="@id/buttonFact" 
    android:text="@string/buttonPow" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonSqrt" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/editText" 
    android:layout_toRightOf="@id/buttonPow" 
    android:text="@string/buttonSqrt" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonClear" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_toRightOf="@id/buttonSqrt" 
    android:layout_below="@id/editText" 
    android:text="@string/buttonClear" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonSine" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonFact" 
    android:text="@string/buttonSine" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonCosine" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonPow" 
    android:layout_toRightOf="@id/buttonSine" 
    android:text="@string/buttonCosine" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonTangent" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonSqrt" 
    android:layout_toRightOf="@id/buttonCosine" 
    android:text="@string/buttonTangent" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonLog" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonClear" 
    android:layout_toRightOf="@id/buttonTangent" 
    android:text="@string/buttonLog" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonLeftC" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonSine" 
    android:text="@string/buttonLeftC" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonRightC" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonCosine" 
    android:layout_toRightOf="@id/buttonLeftC" 
    android:text="@string/buttonRightC" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonExp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonTangent" 
    android:layout_toRightOf="@id/buttonRightC" 
    android:text="@string/buttonExp" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonPie" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonLog" 
    android:layout_toRightOf="@id/buttonExp" 
    android:text="@string/buttonPie" 
    android:textSize="20sp" /> 


<Button 
    android:id="@+id/buttonSeven" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonLeftC" 
    android:text="@string/buttonSeven" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonEight" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonRightC" 
    android:layout_toRightOf="@id/buttonSeven" 
    android:text="@string/buttonEight" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonNine" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonExp" 
    android:layout_toRightOf="@id/buttonEight" 
    android:text="@string/buttonNine" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonFour" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonSeven" 
    android:text="@string/buttonFour" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonFive" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonEight" 
    android:layout_toRightOf="@id/buttonFour" 
    android:text="@string/buttonFive" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonSix" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonNine" 
    android:layout_toRightOf="@id/buttonFive" 
    android:text="@string/buttonSix" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonOne" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonFour" 
    android:text="@string/buttonOne" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonTwo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonFive" 
    android:layout_toRightOf="@id/buttonOne" 
    android:text="@string/buttonTwo" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonThree" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonSix" 
    android:layout_toRightOf="@id/buttonTwo" 
    android:text="@string/buttonThree" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonDot" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonOne" 
    android:text="@string/buttonDot" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonZero" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/buttonTwo" 
    android:layout_toRightOf="@id/buttonDot" 
    android:text="@string/buttonZero" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonEqual" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignRight="@id/buttonNine" 
    android:layout_below="@id/buttonThree" 
    android:text="@string/buttonEqual" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonDivide" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignTop="@id/buttonNine" 
    android:layout_toRightOf="@id/buttonNine" 
    android:text="@string/buttonDIvide" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonMultiply" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignTop="@id/buttonSix" 
    android:layout_toRightOf="@id/buttonSix" 
    android:text="@string/buttonMultiply" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonSubtract" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignTop="@id/buttonThree" 
    android:layout_toRightOf="@id/buttonThree" 
    android:text="@string/buttonSubtract" 
    android:textSize="20sp" /> 

<Button 
    android:id="@+id/buttonAdd" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignTop="@id/buttonEqual" 
    android:layout_toRightOf="@id/buttonEqual" 
    android:text="@string/buttonAdd" 
    android:textSize="20sp" /> 

</RelativeLayout>

来源

2017-04-09 Anant_infinity

他们使用一些辅助类，即DataBinding和MainActivityBinding。所以你必须将这个类放入你的包中。 –

您需要取消注释了：

//import com.example.anant.scientificcalculator.databinding.MainActivityBinding;

这是您的数据绑定自动生成的类。你需要它。使它看起来像这样：

com.example.anant.scientificcalculator.databinding.MainActivityBinding;

其次，XML文件是不正确的，它应该有它的RelativeLayout裹在layout标签，就像这样：

<layout> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/main_activity" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.example.anant.scientificcalculator.MainActivity"> 
... 
</layout>

之后你这样做，这样做一个干净和重建，我认为你应该很好去。

来源

2017-04-09 05:40:07 BlackHatSamurai

我该如何使用它？ –

它显示在你的代码字数据绑定中的错误 –

@Anant_infinity看到我的更新 – BlackHatSamurai

取消注释

import com.example.anant.scientificcalculator.databinding.MainActivityBinding;

而下<layout>标签包装你的布局。

来源

2017-04-09 05:48:28 Rahul

但我的XML文件有一个名称main_activity.xml，所以生成的类是MainActivityBinding按照Android开发人员的网站指示 –

更新我的答案请检查。 – Rahul

这是不正确的，这是另一个项目的名称，数据绑定文件是由Android Studio自动生成的。 – BlackHatSamurai

无法解析MainActivityBinding并绑定相关问题

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