java.lang.NumberFormatException：无效INT：＆QUOT;＆QUOT;例外 [英] java.lang.NumberFormatException: Invalid int: "" EXCEPTION
本文介绍了java.lang.NumberFormatException：无效INT：＆QUOT;＆QUOT;例外的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如果用户留下的空的EditText发生错误java.lang.NumberFormatException：无效INT：。
错误正值行
If the user left the edittext empty an error occurs java.lang.NumberFormatException: Invalid int: "". The error comes at line
if (a=="" && b=="")
和还行
int result = Integer.parseInt(a) + Integer.parseInt(b);
t1.setText(Integer.toString(result));
Calci.java
package com.example.calculator;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Calci extends Activity {
TextView t1;
EditText e1, e2;
Button add, sub, mul, div;
Context c=this;
String b, a;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calci);
e1 = (EditText) findViewById(R.id.EditText01);
e2 = (EditText) findViewById(R.id.EditText02);
add = (Button) findViewById(R.id.add);
sub = (Button) findViewById(R.id.sub);
mul = (Button) findViewById(R.id.mul);
div = (Button) findViewById(R.id.div);
t1 = (TextView) findViewById(R.id.textView1);
a = e1.getText().toString();
b = e2.getText().toString();
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (a=="" && b==""){
AlertDialog.Builder a1 = new AlertDialog.Builder(c);
// Setting Dialog Title
a1.setTitle("Alert Dialog");
// Setting Dialog Message
a1.setMessage("PLEASE ENTER SOMETHING");
a1.setPositiveButton("yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int button1) {
// if this button is clicked, close
// current activity
dialog.cancel();
}
});
// Showing Alert Message
AlertDialog alertDialog = a1.create();
a1.show();
}
else{
int result = Integer.parseInt(a) + Integer.parseInt(b);
t1.setText(Integer.toString(result));
InputMethodManager imm = (InputMethodManager)getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(add.getWindowToken(), 0);
}
}
});
}
}
LogCat中：
03-19 15:42:21.165: E/Trace(25381): error opening trace file: Permission denied (13)
03-19 15:42:21.165: D/ActivityThread(25381): setTargetHeapUtilization:0.25
03-19 15:42:21.165: D/ActivityThread(25381): setTargetHeapIdealFree:8388608
03-19 15:42:21.165: D/ActivityThread(25381): setTargetHeapConcurrentStart:2097152
03-19 15:42:21.385: D/libEGL(25381): loaded /system/lib/egl/libEGL_adreno200.so
03-19 15:42:21.465: D/libEGL(25381): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
03-19 15:42:21.475: D/libEGL(25381): loaded /system/lib/egl/libGLESv2_adreno200.so
03-19 15:42:21.475: I/Adreno200-EGL(25381): <qeglDrvAPI_eglInitialize:299>: EGL 1.4 QUALCOMM build: (Merge)
03-19 15:42:21.475: I/Adreno200-EGL(25381): Build Date: 07/09/13 Tue
03-19 15:42:21.475: I/Adreno200-EGL(25381): Local Branch: AU_41
03-19 15:42:21.475: I/Adreno200-EGL(25381): Remote Branch:
03-19 15:42:21.475: I/Adreno200-EGL(25381): Local Patches:
03-19 15:42:21.475: I/Adreno200-EGL(25381): Reconstruct Branch:
03-19 15:42:21.675: D/OpenGLRenderer(25381): Enabling debug mode 0
03-19 15:42:24.325: D/AndroidRuntime(25381): Shutting down VM
03-19 15:42:24.325: W/dalvikvm(25381): threadid=1: thread exiting with uncaught exception (group=0x41972378)
03-19 15:42:24.395: E/AndroidRuntime(25381): FATAL EXCEPTION: main
03-19 15:42:24.395: E/AndroidRuntime(25381): java.lang.NumberFormatException: Invalid int: ""
03-19 15:42:24.395: E/AndroidRuntime(25381): at java.lang.Integer.invalidInt(Integer.java:138)
03-19 15:42:24.395: E/AndroidRuntime(25381): at java.lang.Integer.parseInt(Integer.java:359)
03-19 15:42:24.395: E/AndroidRuntime(25381): at java.lang.Integer.parseInt(Integer.java:332)
03-19 15:42:24.395: E/AndroidRuntime(25381): at com.example.calculator.Calci$1.onClick(Calci.java:67)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.view.View.performClick(View.java:4147)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.view.View$PerformClick.run(View.java:17161)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.os.Handler.handleCallback(Handler.java:615)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.os.Handler.dispatchMessage(Handler.java:92)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.os.Looper.loop(Looper.java:213)
03-19 15:42:24.395: E/AndroidRuntime(25381): at android.app.ActivityThread.main(ActivityThread.java:4787)
03-19 15:42:24.395: E/AndroidRuntime(25381): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 15:42:24.395: E/AndroidRuntime(25381): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 15:42:24.395: E/AndroidRuntime(25381): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
03-19 15:42:24.395: E/AndroidRuntime(25381): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
03-19 15:42:24.395: E/AndroidRuntime(25381): at dalvik.system.NativeStart.main(Native Method)
03-19 15:42:25.685: I/Process(25381): Sending signal. PID: 25381 SIG: 9
任何人有一个想法如何解决这些堆栈跟踪错误。
Anybody have an idea how to solve these stack trace error.
推荐答案
使用以下
a = e1.getText().toString().trim();
b = e2.getText().toString().trim();
if (a.equals("") && b.equals("") ){
}
这篇关于java.lang.NumberFormatException：无效INT：＆QUOT;＆QUOT;例外的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
