Develop Reference

How to Format double data from database and set into Textview using comma as decimal divider on Android

I have field on table as double (money data field), and i want to put it on Textview in format for example:
money= 20.0
i want to show as: 20,0
or money = 190.25
i want to show as: 190,25
how to do that? this is my variable
txtTotalBill.setText(String.valueOf(total_bill));

You can use the String method replace to format your chain :
txtTotalBill.setText(String.valueOf(total_bill).replace('.', ','));

String total = String.valueOf(total_bill);
total = total.replace(".", ",");
try this and then settext hope it helps
txtTotalBill.setText(total.toString());
Or you can directly setText without variable like this:
txtTotalBill.setText(String.valueOf(total_bill).replace('.', ','));

how to allow only specific number in edittext?

am trying to put only a specific value in my edit text.
I have used this this my layout.
android:digits="0123468"
however, i also do not want that number 1 and 3 should work in my edit text.
Sample; enter 32... it gives me a list of items
but enter 3 should not allow me to do something.
Can someone help me on this?

This could be an aproach:
<EditText
android:id="#+id/edtNumber"
android:digits="0123456789"
android:inputType="number" />
And if you want to discard '1' and '3' you could get input number like this:
Integer.parseInt(edtNumber.getText().toString())
and compare it with values you don't want.
Also if for some reason you want to use decimals do this:
<EditText
android:id="#+id/edtNumberDecimal"
android:digits="0123456789."
android:inputType="numberDecimal" />

Use regular expressions.
#Override
public void afterTextChanged(Editable s) {
String text = s.toString();
int length = text.length();
Pattern pattern
= Pattern.compile("(?s)\\d|[024-9]{2,}");
if(length > 0 && !Pattern.matches(pattern, text)) {
s.delete(length - 1, length);
}
}

How to keep a text field empty in Android?

I am new to android development , i am trying to develop an app where user can keep a few text field empty,
However when user doesn't provide any input in the text field app crashes.
How do we handle empty text field in android
Following is my code for text Field.
<EditText
android:layout_width="40dp"
android:layout_height="40dp"
android:inputType="number"
android:ems="10"
android:id="#+id/editText1"
android:layout_weight="1"
android:background="#ffb7ffbf"/>`
java code:
TextView t1 = (TextView)findViewById(R.id.editText1);
a1 = Integer.parseInt(t1.getText().toString());

you should cast EditText instead of TextView.
EditText t1 = (EditText)findViewById(R.id.editText1);

Ensure if the TextBox is not empty before parsing the value to the int as
if (e.length()>0) {
int a1= Integer.parseInt(e.getText().toString());
}
Else you can get a java.lang.NumberFormatException: for Invalid int: "";

Try this:
TextView t1=(TextView)findViewById(R.id.editText1);
String aux = t1.getText.toString();
if(aux.length() > 0)
a1= Integer.parseInt(aux);
else
// the text is empty
getText.toString will bring you something always so it can be and string size 0, wich is empty. that will make the parseInt() throw an error because it won find a number in the string.
So you have to ask if the length of the string > 0, before the parse.

Decimal Amount Format Issue-Android

Declaration :
DecimalFormat mAmtFormat = new DecimalFormat("##,##,##,##0.00");
edtAmounts = (EditText) findViewById(R.id.txtAmounts);
From xml File Edit text as
<EditText
android:id="#+id/txtAmounts"
android:layout_height="50dip"
android:layout_marginLeft="10dip"
android:background="#FFFFFF"
android:gravity="center_vertical"
android:inputType="numberDecimal"
android:singleLine="true"
android:textSize="18dip"
android:textStyle="bold"
android:width="170dip" />
From Back End mCurtotamt is 565656565(double)
Fetching Data From Sqlite DataBase:
edtAmounts.setText(String.valueOf(mAmtFormat.format(mDoubleformat
.parse(mCurtotamt).doubleValue())))
but the value set into the edit text as 56,56,57,000.00
what is happening over here.

When you get the value from the back end, do not get it as a String like this:
String mCurtotamt = cursor.getString(cursor.getColumnIndex("column_name"));
Instead, get it as a double directly, like this:
double mCurtotamt = cursor.getDouble(cursor.getColumnIndex("column_name"));
Then you don't need to parse it when you set the edit text, but can format it directly:
edtAmounts.setText(String.valueOf(mAmtFormat.format(mCurtoamt)));
The problem is being introduced when converting it to a String when you call cursor.getString().

Use this one for indian format like this "##,##,##0.00" :
static public String formatCurrency(Double doubleVal) {
return new DecimalFormat("##,##,##0.00").format(doubleVal);
}
This function return the value in correct given format. If you pass 5555555.00 value then function return 55,55,555.00 as a string.

Breaking a line without increasing text length

I'm able to break a line using following code:
String str1 = "TEST1"; // length = 5
String str2 = "TEST2"; // length = 5
TextView textView = (TextView)findViewById( R.id.text_view );
textView.setText(str1 + '\n' + str2);
But the final text length is equal to 11.
Question:
Is there any special character or method that will allow me to reach the same result inside my TextView without increasing text length?
What I'm trying to achieve:
I have a data format, which is stored in JSON. It looks like
[{type: line, params: {line params}}, {type: text, params: {text params}, ...]
There is always line at the start
Each paragraph begins with line ( so it acts like a line separator which is stored at the beginning of line, not at the end )
Size of each line equals to 1, i.e. each line counts as a single character
Each paragraph ends with text's last character ( not '\n' )
There are some line params ( like BulletList, Numeric list, Paragraph )
I need a strict mapping between my TextView and source data, i.e. for each cursor position in my TextView I need to count how many characters preceed it in source data.

Take two TextViews and add one below another .Then you won't find any length problem.
like : <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView1" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView1"
android:text="TextView2" />
</RelativeLayout>

String str1 = "TEST1";
String str2 = "TEST2";
TextView text=(TextView)vi.findViewById(R.id.text);
text.setText(str1);
text.append(Html.fromHtml(< br>));
text.append(str2);
Hope it works :)

For your question my answer will be no. But you could make your own TextView and change how it calculates the length of the text by for example ignoring "/n" when counting the length.

Well there is tricky way
String str1 = "TEST1"; // length = 5
String str2 = "TEST2"; // length = 5
textView = (TextView)findViewById( R.id.textView1 );
textView.setWidth(120);
textView.setTextSize(20);
textView.setText(str1 + str2);
//textView.getText().toString().length() length = 10
in XMl
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="TextView" />