Question

您好我正在尝试开发一款计算器应用程序，它可以根据给定的重量和高度来计算您的瘦体重！一切正常，如果我把editText留空并按下计算按钮然后我的应用程序崩溃了！

这是我的代码

package com.example.bodybuildingcalc;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class LeanBodyMass extends Activity {
RadioGroup rg;
RadioButton male, female;
TextView tv;
int weight_, height_;
static double result;
EditText weight, height;
private static final int MALE = 100;
private static final int FEMALE = 101;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lean_body_mass);
    rg = (RadioGroup) findViewById(R.id.gender_lbm);
    tv = (TextView) findViewById(R.id.result_lbm);
    weight = (EditText) findViewById(R.id.weight_lbm);
    height = (EditText) findViewById(R.id.height_lbm);
    male = (RadioButton) findViewById(R.id.male_lbm);
    male.setId(MALE);
    female = (RadioButton) findViewById(R.id.female_lbm);
    female.setId(FEMALE);
    if (savedInstanceState != null) {
        if (result != 0) {
            tv.setVisibility(0);
            if (result < 0) {
                tv.setText("Your Lean Body Mass is Lesser than Zero!");

            } else {
                tv.setText("Your Lean Body Mass is " + (int) result + "kg");

            }
        }
    }
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    // TODO Auto-generated method stub
    super.onSaveInstanceState(outState);
    outState.putDouble("RESULT", result);
}

public void Calculate(View v) {

    switch (rg.getCheckedRadioButtonId()) {
    case 100:

        if (weight.getText().toString() != ""
                & height.getText().toString() != ""){

            weight_ = Integer.parseInt(weight.getText().toString());
            height_ = Integer.parseInt(height.getText().toString());
            result = (0.32810 * weight_) + (0.33929 * height_) - 29.5336;
            if (result < 0) {
                tv.setText("Your Lean Body Mass is Lesser than Zero!");
                tv.setVisibility(0);
            } else {
                tv.setText("Your Lean Body Mass is " + (int) result + "kg");
                tv.setVisibility(0);
            }

        } else {
            Toast.makeText(getApplicationContext(),
                    "Oops! you forgot to enter height and weight",
                    Toast.LENGTH_SHORT).show();
        }
        break;

    case 101:
        weight_ = Integer.parseInt(weight.getText().toString());
        height_ = Integer.parseInt(height.getText().toString());
        result = (0.29569 * weight_) + (0.41813 * height_) - 43.2933;
        if (result < 0) {
            tv.setText("Your Lean Body Mass is Lesser than Zero!");
            tv.setVisibility(0);
        } else {
            tv.setText("Your Lean Body Mass is " + (int) result + "kg");
            tv.setVisibility(0);
        }
        break;
    case -1:
        // first
        if (weight.getText().toString().matches("")) {
            // secound
            if (height.getText().toString().matches("")) {

                Toast.makeText(getApplicationContext(),
                        "Oops! you forgot to enter height and weight",
                        Toast.LENGTH_SHORT).show();
                // secound-end
            } else {
                // three

                Toast.makeText(getApplicationContext(),
                        "Oops! you forgot to enter weight",
                        Toast.LENGTH_SHORT).show();
                // secound-end
            }

        } else {
            if (height.getText().toString().matches("")) {
                Toast.makeText(getApplicationContext(),
                        "Oops! you forgot to enter height!",
                        Toast.LENGTH_SHORT).show();
            } else {

                Toast.makeText(getApplicationContext(),
                        "Please Select Your Gender!", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

}}

这是Logcat：

04-18 00:27:53.206: D/AndroidRuntime(990): Shutting down VM
04-18 00:27:53.216: W/dalvikvm(990): threadid=1: thread exiting with uncaught exception       (group=0x4001d800)
04-18 00:27:53.256: E/AndroidRuntime(990): FATAL EXCEPTION: main
04-18 00:27:53.256: E/AndroidRuntime(990): java.lang.IllegalStateException: Could not  execute method of the activity
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.view.View$1.onClick(View.java:2072)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.view.View.performClick(View.java:2408)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.view.View$PerformClick.run(View.java:8816)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.os.Handler.handleCallback(Handler.java:587)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.os.Handler.dispatchMessage(Handler.java:92)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.os.Looper.loop(Looper.java:123)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.app.ActivityThread.main(ActivityThread.java:4627)
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.reflect.Method.invokeNative(Native Method)
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.reflect.Method.invoke(Method.java:521)
04-18 00:27:53.256: E/AndroidRuntime(990):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-18 00:27:53.256: E/AndroidRuntime(990):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-18 00:27:53.256: E/AndroidRuntime(990):  at dalvik.system.NativeStart.main(Native Method)
04-18 00:27:53.256: E/AndroidRuntime(990): Caused by: java.lang.reflect.InvocationTargetException
04-18 00:27:53.256: E/AndroidRuntime(990):  at com.example.bodybuildingcalc.LeanBodyMass.Calculate(LeanBodyMass.java:64)
04-18 00:27:53.256: E/AndroidRuntime(990):  at com.example.bodybuildingcalc.LeanBodyMass.Calculate(LeanBodyMass.java:64)
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.reflect.Method.invokeNative(Native Method)
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.reflect.Method.invoke(Method.java:521)
04-18 00:27:53.256: E/AndroidRuntime(990):  at android.view.View$1.onClick(View.java:2067)
04-18 00:27:53.256: E/AndroidRuntime(990):  ... 11 more
04-18 00:27:53.256: E/AndroidRuntime(990): Caused by: java.lang.NumberFormatException: unable to parse '' as integer
04-18 00:27:53.256: E/AndroidRuntime(990): Caused by: java.lang.NumberFormatException: unable to parse '' as integer
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.Integer.parseInt(Integer.java:412)
04-18 00:27:53.256: E/AndroidRuntime(990):  at java.lang.Integer.parseInt(Integer.java:382)
04-18 00:27:53.256: E/AndroidRuntime(990):  ... 15 more

这是布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="Weight :"

      />
    <EditText 
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:id="@+id/weight_lbm"/>
</LinearLayout>
<LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="Height :"

      />
    <EditText 
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:id="@+id/height_lbm"/>
</LinearLayout>

<RadioGroup
    android:id="@+id/gender_lbm"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:gravity="center"
    android:orientation="horizontal"
    android:padding="5dp" >

  <RadioButton 
      android:text="Male"
      android:id="@+id/male_lbm"
      />
  <RadioButton 
      android:text="Female"
      android:id="@+id/female_lbm"
      />  
   <Button 
       android:layout_height="wrap_content"
       android:layout_width="wrap_content"
       android:text="Calculate"
       android:onClick="Calculate"
       />   
</RadioGroup>

<TextView
    android:id="@+id/result_lbm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:visibility="invisible" />

</LinearLayout>

Answer 1

错误java.lang.NumberFormatException: unable to parse '' as integer表示您尝试转换为整数的数字不是数字或不存在。

如果您的EditText null ，则无法将null值转换为整数。

因此，请务必检查EditText的空值，如下所示：

 public void Calculate(View v) {

   switch (rg.getCheckedRadioButtonId()) {
   case 100:

    if (!TextUtils.isEmpty(weight.getText().toString())
            &   !TextUtils.isEmpty(height.getText().toString())){

        weight_ = Integer.parseInt(weight.getText().toString());
        height_ = Integer.parseInt(height.getText().toString());
        result = (0.32810 * weight_) + (0.33929 * height_) - 29.5336;
        if (result < 0) {
            tv.setText("Your Lean Body Mass is Lesser than Zero!");
            tv.setVisibility(0);
        } else {
            tv.setText("Your Lean Body Mass is " + (int) result + "kg");
            tv.setVisibility(0);
        }

Answer 2

使用TextUtils.isEmpty（edittext.getText（）。toString（））来验证edittext。如果edittext为空，则向用户显示警告吐司。

Answer 3

当您的edittext为空时，在运行时Integer.parseInt（＆＃34;＆＃34;）; parseInt方法无法解析任何其他字符串。您可以使用parseInt方法解析的几个示例是＆＃34; 8＆＃34;，＆＃34; 0＆＃34;，＆＃34; 100＆＃34;等。＆＃34; 8s＆＃34;，＆＃34; askls＆＃34;等等这些字符串无法使用parseInt方法解析

Android应用程序java.lang.IllegalStateException错误

3 个答案: