how to get text from textview

Question

if I have set text in textview in such way, which is not problem:

  tv.setText("" + ANS[i]); 

this simply getting from this way.

     String a = tv.getText().toString();      int A = Integer.parseInt(a); 

But in case of setting value in textView.

 tv1.setText("  " + X[i] + "\n" + "+" + " " + Y[i]); 

which is like this

              5              +9 

I have problem , this value how to get.

Answer 1

I haven't tested this - but it should give you a general idea of the direction you need to take.

For this to work, I'm going to assume a few things about the text of the TextView:

1. The TextView consists of lines delimited with "\n".
2. The first line will not include an operator (+, -, * or /).
3. After the first line there can be a variable number of lines in the TextView which will all include one operator and one number.
4. An operator will allways be the first Char of a line.

First we get the text:

String input = tv1.getText().toString(); 

Then we split it up for each line:

String[] lines = input.split( "\n" ); 

Now we need to calculate the total value:

int total = Integer.parseInt( lines[0].trim() ); //We know this is a number.  for( int i = 1; i < lines.length(); i++ ) {    total = calculate( lines[i].trim(), total ); } 

The method calculate should look like this, assuming that we know the first Char of a line is the operator:

private int calculate( String input, int total ) {    switch( input.charAt( 0 ) )       case '+':          return total + Integer.parseInt( input.substring( 1, input.length() );       case '-':          return total - Integer.parseInt( input.substring( 1, input.length() );                    case '*':          return total * Integer.parseInt( input.substring( 1, input.length() );                    case '/':          return total / Integer.parseInt( input.substring( 1, input.length() ); } 

---

EDIT

So the above as stated in the comment below does "left-to-right" calculation, ignoring the normal order ( + and / before + and -).

The following does the calculation the right way:

String input = tv1.getText().toString(); input = input.replace( "\n", "" ); input = input.replace( " ", "" ); int total = getValue( input ); 

The method getValue is a recursive method and it should look like this:

private int getValue( String line ) {   int value = 0;    if( line.contains( "+" ) ) {     String[] lines = line.split( "\\+" );     value += getValue( lines[0] );      for( int i = 1; i < lines.length; i++ )       value += getValue( lines[i] );      return value;   }    if( line.contains( "-" ) ) {     String[] lines = line.split( "\\-" );     value += getValue( lines[0] );      for( int i = 1; i < lines.length; i++ )       value -= getValue( lines[i] );      return value;   }    if( line.contains( "*" ) ) {     String[] lines = line.split( "\\*" );     value += getValue( lines[0] );      for( int i = 1; i < lines.length; i++ )       value *= getValue( lines[i] );      return value;   }    if( line.contains( "/" ) ) {     String[] lines = line.split( "\\/" );     value += getValue( lines[0] );      for( int i = 1; i < lines.length; i++ )       value /= getValue( lines[i] );      return value;   }    return Integer.parseInt( line ); } 

Special cases that the recursive method does not handle:

• If the first number is negative e.g. -3+5*8.
• Double operators e.g. 3*-6 or 5/-4.

Also the fact the we're using Integers might give some "odd" results in some cases as e.g. 5/3 = 1.

Answer 2

split with the + sign like this way

String a = tv.getText().toString(); String aa[]; if(a.contains("+"))     aa = a.split("+"); 

now convert the array

Integer.parseInt(aa[0]); // and so on