I want to get a number from editText and use in a calculation, there is no any error in my code but I didn't get what I looking for, the value of r is alwayas 1, here is the code:
public class Counter extends Activity {
Button add, sub;
TextView result;
EditText range;
double r;
public double c=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_counter);
add = (Button) this.findViewById(R.id.add);
sub = (Button) this.findViewById(R.id.sub);
result = (TextView) this.findViewById(R.id.result);
range = (EditText) this.findViewById(R.id.range);
try {
r = new Double(range.getText().toString());
} catch (NumberFormatException e) {
r = 1; // your default value
}
add.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
c=c+r;
result.setText(""+c);
}
});
sub.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
c=c-r;
result.setText(""+c);
}
});
}
any help ??
try {
r = new Double(range.getText().toString());
} catch (NumberFormatException e) {
r = 1; // your default value
}
the snippet of code you posted is correct. Double has a constructor that takes a String . The problem is that you are executing it after your findViewById and probably the EditText does not contain nothing. For instance when you press on add, you can retrieve the content of the EditText again and parse it:
add.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
try {
r = new Double(range.getText().toString());
} catch (NumberFormatException e) {
r = 1; // your default value
}
c=c+r;
result.setText(""+c);
}
});
Double class provides a static method which parses a string to double.
So try to change:
r = new Double(range.getText().toString());
To:
r = Double.parseDouble(range.getText().toString());
Additionally, you may want to parse other strings to other types of numbers such as integers:
int x = Integer.parseInt(yourString);
Try this (parsing string to double):
r = Double.parseDouble(range.getText().toString());
you should get value from EditText when user will click on button when you will get value only in onCreate() it will be take data from EditText when it will be created
You need to use Double.parseDouble(range.getText().toString());
You just need to do:
r = Double.parseDouble(range.getText().toString()); // Surround with try/catch for fancy functionality
use like that:
r=Double.parseDouble(range.getText().toString());
Try this one: Just in case there is the possibility that the String from the EditText cannot be parsed to a double I have put it inside a try-catch block.
double r;
try {
r = Double.parseDouble(range.getText().toString());
catch (NumberFormatException ex) {
r = 1;
}
Hope this helps :)
you can make your editText in the XML file so that it accepts only numbers
android:inputType="number"
and in your java code
r = Double.parseDouble(range.getText().toString());
Related
I have 2 buttons for the quality. If the quality is set by typing first, the buttons work well, but if I don't write any quantity and I want to set it by plus button, the app crash.
increaseQuantity.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String textQuantity = quantity.getText().toString();
givenQuantity = Integer.parseInt(textQuantity);
quantity.setText(String.valueOf(givenQuantity + 1));
}
});
decreaseQuantity.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String textQuantity = quantity.getText().toString();
givenQuantity = Integer.parseInt(textQuantity);
//To validate if quantity is greater than 0
if ((givenQuantity - 1) >= 0) {
quantity.setText(String.valueOf(givenQuantity - 1));
} else {
Toast.makeText(EditorActivity.this, R.string.quantity_no_less_then_0, Toast.LENGTH_SHORT).show();
return;
}
}
});
Surround all your parsing lines with try/catch, like:
try {
givenQuantity = Integer.parseInt(textQuantity);
} catch (NumberFormatException e) {
e.printStackTrace();
givenQuantity = 0;
}
when the EditText is empty, a NumberFormatException is thrown because an empty string can not be parsed to int.
check is edittext is empty or not. If empty show toast message to user asking to enter some value to calculate.
What do you think is wrong with this code ?
I am using this class: https://github.com/btouchard/HttpData/blob/master/README.md
Error:
java.lang.IllegalStateException: Could not execute method of the activity
Location of error: Log.i line!
Thanks for the assistance.
I guess it is a basic solution, but I can't find it.
public class Formulaire extends Activity {
EditText msgTextField;
Button sendButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.form);
//make message text field object
msgTextField = (EditText) findViewById(R.id.msgTextField);
//make button object
sendButton = (Button) findViewById(R.id.sendButton);
}
public void send(View v) {
//get message from message box
try {
String MonURL = "http://www.davidmarchioni.fr/glopper/test.txt";
HttpData request = new HttpData(MonURL);
request.header(MonURL);
String html = request.asString();
Thread.sleep(2600);
Log.i("OK >> ", html);
Toast.makeText(getApplicationContext(), html, Toast.LENGTH_SHORT).show();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
well try on catching Exception, what if String html comes null? what maybe the reason
I have three strings
String one="Connecting.";
String two="Connecting..";
String three="Connecting...";
I have a textView, what I want is to set text to textview in this order..
one-->two-->three-->one-->two-->three and so on until the process is completed.
I have done it in a for loop based on value i.e
if(value%3==0){
tx.setText(one);
}
else if(value%3==1){
tx.setText(two);
}
else
{
tx.setText(three);
}
This is done inside a thread and it is working well.
But I dont want to rely on "value".. I jst want that until process is completed the text changes in order as mentioned above.
I know it is vague but I am not getting how to do this.
Please if someone can give any hint.
code:
public void startProgress(View view) {
bar.setProgress(0);
tx.setText("Connect");
new Thread(new Task()).start();
}
class Task implements Runnable {
#Override
public void run() {
for (int i = 0; i <= 10; i++) {
final int value = i;
try {
Thread.sleep(500);
runOnUiThread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
bar.setProgress(value);
String one="Connecting.";
String two="Connecting..";
String three="Connecting...";
if(value%3==0){
tx.setText(one);
}
else if(value%3==1){
tx.setText(two);
}
else
{
tx.setText(three);
}
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
It makes sense to have a counter like value that keeps incrementing. But you could do it a little more simply:
String[] texts = new String[3] {"Connecting.", "Connecting..", "Connecting..."};
int value = 0;
// ...
tx.setText(texts[value]);
value = (value+1)%3;
This way, you don't need your big messy if statement. You will need to find another way of notifying your thread when the job is done, rather than just having a fixed number of iterations.
Use TextSwitcher instead of TextView...It will work
I try to reverse my binary string.Any solution?
private OnClickListener btnConvListener = new OnClickListener() {
public void onClick(View v) {
try{
String ag=edittext1.getText().toString();
HexToBinary(ag);
} catch (Exception e) {
Toast.makeText(getBaseContext(), "Not insert data!",Toast.LENGTH_SHORT).show();
}
}
};
void HexToBinary(String Hex) {
int i = Integer.parseInt(Hex, 16);
String Bin = Integer.toBinaryString(i);//Converts int to binary
text1.setText(Bin);
//Bit reversal method....
int reversedNum = Integer.reverse(i);
text2.setText(reversedNum);
}
This function converts string Hex to string Binary...but i want an extra output to opposite
LSB->MSB...
I test it but i have not output....i have exception from try/catch...error not input data...why? Shows only the original binary...not the reverse...
You can use
Integer.reverse(int i);
before you convert to a string. See the api documentation http://developer.android.com/reference/java/lang/Integer.html#reverse%28int%29
This question already has answers here:
How do I check if my EditText fields are empty? [closed]
(30 answers)
Closed 9 years ago.
My code does not print empty edit text itry trim stirng .length==00 but is not work hat wrong in my code?? how do my code check if edittext is empty before sumbit query
I want to check before submit method if edittext is empty? If is empty then print toast message
public class AgAppTransPayExternalAccount extends Activity {
TextView lblTPEAWelcomeToPayExternalAccountPage;
TextView lblTPEAOtherAccount;
TextView lblTPEAPinno;
TextView lblTPEAAmount;
EditText txtTPEAotheraccount;
EditText txtTPEApinno;
EditText txtTPEAamount;
Button btnTPEAsubmit;
Button clearTPEAButton;
Button btnTPEAgoback;
String sms;
public static ProgressDialog PayExternalAccountProgressDialog = null;
public static boolean value=true;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.agapptranspayexternalaccount);
sms=LoginScreen.item.toString();
/*
lblTPEAWelcomeToPayExternalAccountPage = (TextView)
findViewById(R.id.lblTPEAWelcomeToPayExternalAccountPage);
lblTPEAWelcomeToPayExternalAccountPage.setText("Welcome To Pay External
Account Page");
lblTPEAWelcomeToPayExternalAccountPage.setTextColor(getResources().getColor
(R.color.text_color_black));
*/
lblTPEAOtherAccount = (TextView) findViewById(R.id.lblTPEAOtherAccount);
lblTPEAOtherAccount.setText("Other Account :");
txtTPEAotheraccount=(EditText) findViewById(R.id.txtTPEAotheraccount);
lblTPEAPinno = (TextView) findViewById(R.id.lblTPEAPinno);
lblTPEAPinno.setText("PIN Number :");
txtTPEApinno=(EditText) findViewById(R.id.txtTPEApinno);
lblTPEAAmount = (TextView) findViewById(R.id.lblTPEAAmount);
lblTPEAAmount.setText("Amount :");
txtTPEAamount=(EditText) findViewById(R.id.txtTPEAamount);
btnTPEAsubmit=(Button) findViewById(R.id.btnTPEAsubmit);
btnTPEAsubmit.setTextColor(getResources().getColor(R.color.text_color_blue));
clearTPEAButton=(Button) findViewById(R.id.clearTPEAButton);
clearTPEAButton.setTextColor(getResources().getColor(R.color.text_color_blue));
btnTPEAgoback=(Button) findViewById(R.id.btnTPEAgoback);
btnTPEAgoback.setTextColor(getResources().getColor(R.color.text_color_blue));
clearTPEAButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
txtTPEAotheraccount.setText("");
txtTPEApinno.setText("");
txtTPEAamount.setText("");
}
});
btnTPEAgoback.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
finish();
}
});
btnTPEAsubmit.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
String tpeapinemptycheck = txtTPEApinno.getText().toString();
String otheraccountemptycheck =
lblTPEAOtherAccount.getText().toString();
String amountemptycheck = txtTPEAamount.getText().toString();
if (tpeapinemptycheck.trim().equals("")||
(otheraccountemptycheck.trim().equals("")) ||(amountemptycheck.trim().equals("")))
{
Toast.makeText(getApplicationContext(), "Please Enter
Correct Information", Toast.LENGTH_LONG).show();
}
else
showProgress();
submitPEA();
}
});
}
private void submitPEA() {
String message;
String mobilenumber= LoginScreen.smsmobileno;
if (( sms.compareTo("SMS")==0))
{
SmsManager smsmanager = SmsManager.getDefault();
message="AGPEA"+AgAppHelperMethods.varMobileNo+AgAppHelperMethods.
arMobileNo+txtTPEAotheraccount.getText().toString()+AgAppHelperMethods.
varMobileNo+txtTPEApinno.getText().toString()+txtTPEAamount.getText().toString();
smsmanager.sendTextMessage(mobilenumber, null, message, null, null);
}
else
{
Intent j = new Intent(AgAppTransPayExternalAccount.this, AgAppTransPEAResponse.class);
Bundle bundle = new Bundle();
bundle.putString("txtTPEApinno", txtTPEApinno.getText().toString());
bundle.putString("txtTPEAotheraccount",txtTPEAotheraccount.getText().toString());
bundle.putString("txtTPEAamount",txtTPEAamount.getText().toString());
j.putExtras(bundle);
startActivity(j);
value=false;
PayExternalAccountProgressDialog.dismiss();
}
}
private void showProgress()
{
PayExternalAccountProgressDialog =
ProgressDialog.show(AgAppTransPayExternalAccount.this,null, "Processing please
wait...", true);
if (PayExternalAccountProgressDialog != null) {
try
{
Handler handler = new Handler();
handler.postDelayed(new Runnable()
{
#Override
public void run()
{
PayExternalAccountProgressDialog.dismiss();
if(value)
{
Toast.makeText(AgAppTransPayExternalAccount.this, "Request
TimeOut " , Toast.LENGTH_SHORT).show();
}
}
}, 15000); // <--- here is the time adjustment.
}
catch (Exception e)
{
}
}
}
}
Your code is right, only missing this is { } braces in the else condition, try out as following,
if (tpeapinemptycheck.trim().equals("")||
(otheraccountemptycheck.trim().equals("")) ||(amountemptycheck.trim().equals("")))
{
Toast.makeText(getApplicationContext(), "Please Enter
Correct Information", Toast.LENGTH_LONG).show();
}
else
{ // add this
showProgress();
submitPEA();
} // add this
Just because you haven't added those { } braces, your control was going into submitPEA() method.
Try like this
edit_text.getText().toString().trim().equals("");
Create a String variable say x;
Now if et is your EditText field use this:
x = et.getText().toString();
if the EditText field has any text in it it would be passed to the string x.
Now to check if the string x is not null or contains nothing use
if(x.matches(""))
{
//your code here
}
else
{
//the counter action you'll take
}
this way you can check that the entry you are about to enter in the database won't be empty.
Happy coding.