It's very simple code but when I initialize the TextView, the app just crashes.
I'm a beginner, so I don't know if I made something wrong.... but in my opinion the code looks fine. Android Studio doesn't report any errors either.
int counterint = 0;
TextView counter = findViewById(R.id.countertv);
public void pressthebutton(View view){
counterint++;
counter.setText(counterint);
}
You are probably setting the TextView during the class instantiation. You should update your code as follows:
int counterint = 0;
TextView counter;
public void onCreate (Bundle savedInstance) {
super.onCreate(savedInstance);
setContentView(<your_layout>);
// Set the textView only after setContent.. Otherwise, findViewById will return null
counter = findViewById(R.id.countertv);
}
public void pressthebutton(View view){
counterint++;
counter.setText(Integer.toString(counterInt));
}
try setting your textview this way :
public void pressthebutton(View view){
counterint++;
counter.setText(String.valueOf(counterInt));
}
The error causes because you directly assign an integer value to the TextView. It is good to convert an integer or any data type to String when you assigning it to the TextView
int counterint = 0;
TextView counter = findViewById(R.id.countertv);
public void pressthebutton(View view){
counterint++;
counter.setText(Integer.toString(counterint));
}
otherview you can convert the Integer value to string first and then assign it to the TextView as follows
int counterint = 0;
TextView counter = findViewById(R.id.countertv);
String counterString = Integer.toString(counterint)
public void pressthebutton(View view){
counterint++;
counter.setText(counterString);
}
Try this
counter.setText(counterint+"");
It automatically set the string value to textview
You may try this :
public void pressthebutton(View view){
counter.setText(String.valueOf(++counterint));
}
Related
So I'm in a basic part of my application I'm wanting to make. I've never gotten this error before, and I don't know what's going on. My .setText is throwing an error saying "setText cannot be resolved or is not a field" I've looked around and haven't been able to find my problem. I believe I'm doing it correctly. If anyone could help me out that'd be great!
MainActivity.java:
public class MainActivity extends Activity {
final TextView loading_Text = (TextView)findViewById(R.id.textView4);
final EditText name_Edit = (EditText)findViewById(R.id.editText1);
//String Values
String Age="";
String Name = name_Edit.getText().toString();
//Int Values
int Gender = 0; //1 male | 2 female
int Group = 0; //Different groups for ages and genders
int save_Info = 0; //save info to phone
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button male_Button= (Button)findViewById(R.id.button1);
Button female_Button = (Button)findViewById(R.id.button2);
male_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Gender++;//Adds one to show this user is a male.
loading_Text.setText=(Name);
}
});
}
I saw two problems:
First:
loading_Text.setText=(Name);
Should be
loading_Text.setText("The text you want to set");
You'll need to take a look at the API document to see how to call the method.
Second:
Move these part:
final TextView loading_Text = (TextView)findViewById(R.id.textView4);
final EditText name_Edit = (EditText)findViewById(R.id.editText1);
//String Values
String Age="";
String Name = name_Edit.getText().toString();
inside your onCreate, like this:
public class MainActivity extends Activity {
TextView loading_Text;
EditText name_Edit;
...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loading_Text = (TextView)findViewById(R.id.textView4);
name_Edit = (EditText)findViewById(R.id.editText1);
Or you'll get NullPointerException.
This is because you were trying to reach the View's property before the view is being initialized. View will be initialized after setContentView, and what you were intend to do was findViewById from R.layout.activity_main before it had been loaded.
Similarly, you'll need to move this call of method:
String Name = name_Edit.getText().toString();
somewhere after setContentView.
setText is a function. So you would need to pass name as a argument.
like loading_Text.setText(Name);
Change
loading_Text.setText=(Name);
to this:
loading_Text.setText(Name);
Also, if you don't see anything in the textview, it is because you are getting the edittext's text before you even create your views, I use an on edittext listener like this to refresh the String when the edit text is changed:
name_Edit.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
Name = name_Edit.getText().toString();
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) {}
});
I hope this works for you :)
Hello I am very new in android
I am trying to get integer value from an EditText, But When I am parsing string to Integer I got NumberFormatException.
Please help me to come out of this error.
thanks in advance.
Program is:
int day,month,year;
EditText expense,ammount;
String[] exp=new String[10];
int[] amt=new int[10];
int count=0;
/** Called when the activity is first created. */
#Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Calendar cal=Calendar.getInstance();
day=cal.get(Calendar.DAY_OF_MONTH);
month=cal.get(Calendar.MONTH)+1;
year=cal.get(Calendar.YEAR);
final TextView txtdate=(TextView)findViewById(R.id.txtdate);
expense=(EditText)findViewById(R.id.exp);
ammount=(EditText)findViewById(R.id.amnt);
final Button add=(Button)findViewById(R.id.btnadd);
final Button cancel=(Button)findViewById(R.id.btncancel);
final Button done=(Button)findViewById(R.id.btndone);
txtdate.setText(day+"/"+month+"/"+year);
add.setOnClickListener(new OnClickListener() {
public void onClick(final View v) {
getval();
}
});
cancel.setOnClickListener(new OnClickListener() {
public void onClick(final View v) {
clean();
}
});
done.setOnClickListener(new OnClickListener() {
public void onClick(final View v) {
total();
getval();
clean();
final TextView tv=(TextView)findViewById(R.id.textView1);
tv.setText(Integer.toString(total()));
}
private int total() {
int total = 0;
// TODO Auto-generated method stub
for(int i=0;i<=count;i++)
{
total+=amt[i];
}
return total;
}
});
}
protected void clean() {
// TODO Auto-generated method stub
expense.setText(" ");
ammount.setText(" ");
}
protected void getval() {
// TODO Auto-generated method stub
final Editable e2=expense.getText();
final Editable e1=ammount.getText();
final int i=Integer.parseInt(e1.toString());
amt[count]=i;
exp[count]=e2.toString();
System.out.println(amt[count]);
System.out.println(exp[count]);
count++;
}
}
Exception is:
java.lang.NumberFormatException: unable to parse ' 600' as integer
Remove any leading or trailing spaces from the number first:
int inputNumber = Integer.parseInt(editText.getText().toString().trim());
Alternatively, you can remove all non-numeric characters from the string using regular expressions:
String cleanInput = editText.getText().toString().replaceAll("[^\\d]", "");
int inputNumber = Integer.parseInt(cleanInput);
Though if non-numeric input characters is a problem you'd probably want to restrict the EditText to numeric only. See this question. It says to add the following attribute to the EditText:
android:inputType="number"
You have a space in your integer.
Add the following attribute to your EditText in your xml to only allow entering integers:
android:inputType="number"
Try this..
final int i=Integer.parseInt(e1.toString().trim());
bacause there is a space before that number see ' 600' that's why that error..
Hope this will help..
use this code
final int f = -1; // or other invalid value
if (edittext.getText().toString().length() > 0)
f = Integer.parseInt(edittext.getText().toString());
07-25 10:15:37.960: E/AndroidRuntime(8661): android.content.res.Resources$NotFoundException: String resource ID #0x7
07-25 10:15:37.960: E/AndroidRuntime(8661): at android.content.res.Resources.getText(Resources.java:230)
Good day to all.
I am trying to display an integer value in a Text View and the above error shows up in LogCat.
There are other similar posts about this issue; like this, this, and this, but none of the solutions worked for me.
Any other ideas of what the problem might be?
Edited for code:
private static Button btnCancel;
private static Button btnConfirm;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtRoomNumber = (EditText)findViewById(R.id.txtRoomNumber);
btnCancel = (Button)findViewById(R.id.btnCancel);
btnConfirm = (Button)findViewById(R.id.btnConfirm);
btnCancel.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
finish();
System.exit(0);
}
});
btnConfirm.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
int rmNo = getRoomNumberValue();
txtTesting.setText(rmNo);
}
});
}
private int getRoomNumberValue()
{
int temp = 0;
try
{
temp = Integer.parseInt(txtRoomNumber.getText().toString());
}
catch(Exception e)
{
e.printStackTrace();
}
return temp;
}
If you are trying to display an integer value in a TextView, use this:
myTextView.setText("" + 1); // Or whatever number
The error happens because TextView has another method: setText(int resid). This method looks for a resource id, which does not exist in your case. Link
You are trying to set the content text of a TextView with an integer value.
The issue is that the method you are using is expecting a resource id.
You need to make a String out of your integer before putting it in the TextView :
textView.setText(Integer.toString(7));
Change your Integer to String
textview.setText(String.valueOf(valueofint));
To convert integer to string use
int x=10;
Integer.toString(x);
That will solve your problem
we have stored some text in an arraylist. we want to display it in a single textview,when I click the textview the next value(text) in the arraylist should be updated in the widget.
If I understand what you're trying to do correctly, try this out:
public class MyActivity extends Activity {
ArrayList<String> values = new ArrayList<String>();
TextView myText;
private int index;
protected void onCreate(Bundle saved) {
super.onCreate(saved);
setContentView(R.layout.content_layout_id);
index = 0;
//example values:
values.add("foo");
values.add("bar");
values.add("another value");
myText = (TextView) findViewById(R.id.myTextId);
//show the first value on myText
myText.setText(values.get(index));
myText.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Show next value in our text view:
myText.setText(values.get(++index));
//be sure to consider the ArrayList.size() so you won't try to present the 6th value in a 5 values ArrayList.
//but this depends on your implementation.
}
});
}
}
What I'm trying to do is:
If the EditText input is equal to the random number generated, then stop the loop otherwise keep on the loop and reset input text.
For some reason, I'm getting an infinite loop. I am new to programming, any help is really appreciated.
Here is the code:
public class Main extends Activity implements OnClickListener{
private TextView tvResult;
private TextView tvRandTest;
private EditText et1;
private String randonNumber;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvResult = (TextView) findViewById(R.id.textView4);
tvRandTest = (TextView) findViewById(R.id.textView3);
et1 = (EditText) findViewById(R.id.editText1);
}//End Main
public void myClickHandler(View view)
{
if(view.getId() == R.id.button1)
{
//Generates 6 one digit Random Numbers
int randonNumber1 = (int) (0 + Math.random() * 9);
//Parse Numbers
String rd1 = Integer.toString(randonNumber1);
randonNumber = rd1;
boolean done = false;
do
{
et1.getText().toString();
if(et1.equals(randonNumber))
{
Toast.makeText(Main.this,"Equal Number", Toast.LENGTH_SHORT).show();
tvResult.setText(randonNumber);
done = true;
}//end if
else
{
Toast.makeText(Main.this,"Not Equal Number", Toast.LENGTH_SHORT).show();
et1.setText("");
}//end else
}//End While
while(!done);
}//End if
if(view.getId() == R.id.button2)
{
tvRandTest.setText(randonNumber);
}
}//End Method
#Override
public void onClick(View arg0) {
// TODO
}
}//End Class
if(et1.equals(randonNumber))
I will change it with
if(et1.equals(String.valueOf(randonNumber)))
you put directly the int value inside the equals method two things will happen:
the autboxing will create an Integer object starting from the int value
the toString() method will be called through this object.
the toString() method of Integer in android, as the doc stands:
Returns a string containing a concise, human-readable description of this object.
So you are compareing the address of the new object with the content of et1 and not with its real value. Here the reference
In this line et1.getText().toString(); you need to assign result to variable, for example String input = et1.getText().toString(); Then in next line you need to compare two strings, if(input.equals(randonNumber)) But your program can hang cause of infinity loop on UI thread. You should use TextWatcher
to handle when text in EditText was changed