java - 应用程序返回错误：无法执行方法：onClick
问题描述
我是 Android 工作室的新手，正在做我的第一个主要项目，这是一个计算分数和整数的计算器。
我现在只编写了用于添加数字的函数，以便我可以测试它是否按预期运行，稍后我将添加其他方法。
但是，当我在我的（外部）平板电脑上运行该应用程序时，我收到此错误：
2020-06-08 21:45:14.250 11504-11504/com.example.fraccalcapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.fraccalcapp, PID: 11504
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24774)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24774)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
at android.content.res.Resources.getText(Resources.java:339)
at android.widget.TextView.setText(TextView.java:5496)
at com.example.fraccalcapp.MainActivity.setResult(MainActivity.java:110)
at com.example.fraccalcapp.MainActivity.addNumbers(MainActivity.java:35)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24774)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
这是我的 MainActivity.java （这是我的应用程序中唯一的活动）代码：
package com.example.fraccalcapp;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText number1;
EditText number2;
TextView wholeNumber;
TextView numerator;
TextView denominator;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void addNumbers(View view){
number1 = findViewById(R.id.editText_number1);
number2 = findViewById(R.id.editText_number2);
int[] frac1 = convertToSimple(convertToFraction(number1.getText().toString()));
int[] frac2 = convertToSimple(convertToFraction(number2.getText().toString()));
int numerator1 = frac1[0];
int denominator1 = frac1[1];
int numerator2 = frac2[0];
int denominator2 = frac2[1];
int commonDenominator = getLCM(denominator1, denominator2);
int[] result = {numerator1 + numerator2, commonDenominator, 0};
result = simplify(result);
setResult(result);
}
public void subNumbers(View view){
}
public void mulNumbers(View view){
}
public void divNumbers(View view){
}
public int[] convertToFraction(String rawFraction){
int[] result = {0,1,0};
if (rawFraction.contains("/") && !rawFraction.contains(" ")){
//regular fraction
String[] rawResult = rawFraction.split("/");
result = new int[]{Integer.parseInt(rawResult[0]), Integer.parseInt(rawResult[1]), 0};
if (result[0] > result[1]){
int num = result[0];
int den = result[1];
int whole = (int) (result[2] + (num/den));
num = num % den;
result = new int[] {num, den, whole};
}
} else if (!rawFraction.contains(" ") && !rawFraction.contains("/")){
//whole number
int wholeNum = Integer.parseInt(rawFraction);
result = new int[]{0,1,wholeNum};
} else if (rawFraction.contains("/") && rawFraction.contains(" ")){
//mixed fraction
String[] wholeSplit = rawFraction.split(" ");
int whole = Integer.parseInt(wholeSplit[0]);
String[] fracSplit = wholeSplit[1].split("/");
int num = Integer.parseInt(fracSplit[0]);
int den = Integer.parseInt(fracSplit[1]);
result = new int[]{num, den, whole};
} else {
Toast.makeText(getApplicationContext(), "You have entered the number in the wrong format. Please read instructions.",
Toast.LENGTH_LONG).show();
}
return result;
}
public int[] convertToSimple(int[] fraction){
int num = fraction[0];
int den = fraction[1];
int whole = fraction[2];
int newNum = num + (whole * den);
int[] result = {newNum, den, 0};
return result;
}
public int getHCF(int a, int b){
int rem = 1;
int dend = Math.max(a,b);
int sor = Math.min(a,b);
do{
rem = dend / sor;
dend = sor;
sor = rem;
} while (rem !=0);
return dend;
}
public int getLCM(int a, int b){
int hcf = getHCF(a, b);
int lcm = (a * b)/hcf;
return lcm;
}
public void setResult(int[] result){
wholeNumber = findViewById(R.id.textView_wholeNumber);
numerator = findViewById(R.id.textView_numerator);
denominator = findViewById(R.id.textView_denominator);
if (result[0] != 0 && result[1] != 1){
numerator.setText(result[0]);
denominator.setText(result[1]);
}
if (result[2] != 0){
wholeNumber.setText(result[2]);
}
}
public int[] simplify(int[] fraction){
int[] frac = convertToSimple(fraction);
int num = fraction[0];
int den = fraction[1];
int whole = fraction[2];
int num_den_hcf = getHCF(num, den);
if (num_den_hcf != 1){
num /= num_den_hcf;
den /= num_den_hcf;
}
if (num > den){
whole += num/den;
num = num%den;
}
if (num == den){
num = 0;
den= 1;
whole += 1;
}
int[] result = {num, den, whole};
return result;
}
}
我从错误中无法理解，这就是为什么我求助于你。如果代码中有一些愚蠢的错误，请原谅我。
编辑：使用 Swayangjit 的解决方案阻止了应用程序给出这个错误，但它仍然没有在 textView 中显示文本。
解决方案
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
at android.content.res.Resources.getText(Resources.java:339)
at android.widget.TextView.setText(TextView.java:5496)
at com.example.fraccalcapp.MainActivity.setResult(MainActivity.java:110)
at com.example.fraccalcapp.MainActivity.addNumbers(MainActivity.java:35)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24774)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
注意这些堆栈跟踪行。它说应用程序无法在一行中找到您尝试作为参数传递的资源
com.example.fraccalcapp.MainActivity.setResult(MainActivity.java:110)
仔细检查此代码和您在此处使用的资源 ID
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