no0bCoder no0bCoder - 5 months ago 20
Android Question

java.lang.numberformatexception: invalid double: " "

getting an error of invalid Double
java.lang.numberformatexception invalid double: ""
what is the reason for this

Activity 1

package com.example.solarcalculator;

import android.os.Bundle;
import android.widget.Button;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.app.AlertDialog;
import android.content.Intent;

@SuppressLint("UseValueOf")
public class MainActivity extends Activity {
private EditText input1;
private EditText input2;
private EditText input3;
private EditText input4;
private EditText input5;
private MainActivity mContext;

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

input5 = (EditText) findViewById(R.id.input5);
Button button1 = (Button) findViewById(R.id.button1);
input4 = (EditText) findViewById(R.id.input4);
input1 = (EditText) findViewById(R.id.input1);
input2 = (EditText) findViewById(R.id.input2);
input3 = (EditText) findViewById(R.id.input3);
button1.setOnClickListener(new OnClickListener() {

@SuppressWarnings("unused")
private AlertDialog show;

@SuppressLint("UseValueOf")
@Override
public void onClick(View arg0) {
if ( (input4.getText().toString() == " ")
|| (input4.getText().length() ==0) ||
(input5.getText().length() == 0)
|| (input5.getText().toString() == " ")){
show = new AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("Some inputs are empty")
.setPositiveButton("OK", null).show();
}
else if ((input1.getText().length() != 0) &&
(input3.getText().length() ==0) && (input2.getText().length() == 0)){
double w = new Double(input3.getText().toString());
double t = new Double(input4.getText().toString());
double x = new Double(input5.getText().toString());
float e = 7;
double num = 1000*x;
double den = w*t*e;
double payback = num/den;
double money = w*t*e/1000;
Intent intent = new Intent(MainActivity.this, Power.class);
intent.putExtra("payback", payback);
intent.putExtra("money", money);
startActivity(intent);

}
else if ((input1.getText().length() == 0) && (input3.getText().length() != 0) &&
(input2.getText().length() != 0)){
double t = new
Double(input4.getText().toString());
double x = new Double(input5.getText().toString());
double v = new Double(input2.getText().toString());
double i = new Double(input3.getText().toString());
float e = 7;
double num = 1000*x;
double den = v*i*t*e;
double payback = num/den;
double money = v*i*t*e/1000;
Intent intent = new Intent(MainActivity.this, Power.class);
intent.putExtra("payback", payback);
intent.putExtra("money", money);
startActivity(intent);

}
else {
double t = new Double(input4.getText().toString());
double x = new Double(input5.getText().toString());
double v = new Double(input2.getText().toString());
double i = new Double(input3.getText().toString());
float e = 7;
double num = 1000*x;
double den = v*i*t*e;
double payback = num/den;
double money = v*i*t*e/1000;
Intent intent = new Intent(MainActivity.this, Power.class);
intent.putExtra("payback", payback);
intent.putExtra("money", money);
startActivity(intent);

}
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}


Activity2

package com.example.solarcalculator;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
@SuppressLint("NewApi")
public class Power extends Activity {

private double money;
private double payback;

@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.power);
payback = getIntent().getDoubleExtra("payback",0);
money = getIntent().getDoubleExtra("money", 0);
TextView pay = (TextView) findViewById(R.id.textView2);
String payback1 = Double.toString(payback);
pay.setText(payback1);
TextView mon = (TextView) findViewById(R.id.textView4);
String money1 = Double.toString(money);
mon.setText(money1);

}
}


I am getting java.lang.numberformatexception invalid double: "" error in logcat
anyone please help

flx flx
Answer

The reason is, that "" is not a valid double. You need to test the String before or catch such exceptions

double w;

try {
    w = new Double(input3.getText().toString());
} catch (NumberFormatException e) {
    w = 0; // your default value
}
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