CODEWITHSUNDEEP
android
user947659
user947659

Reputation: 2645

Array printing with for-loop and .setText() method?

I am using this to try to display all the characters in the array but all it prints is "g" I tested the same code using System.out.println() in regular java and it works fine

        String testarray[]={"a","s","d","f","g"};

    for(int l=0; l<testarray.length; l++){
        String temp="";
        temp=temp+testarray[l];
        display.setText(""+temp);
    }

Thanks!

Upvotes: 0

Views: 8592

Answers (3)

davidcesarino
davidcesarino

Reputation: 16228

By your code, I will avoid what others are saying and I'll explain to you in simple laymen terms:

In plain english, there is a difference between set and print.

When you set something, you replace whatever was there with a new value. When you print, you append something to whatever was there. System.out.print thus appends stuff, while setText sets stuff instead.

The for happens so fast (computer can compute gazillion stuffs faster than you can blink) that you see a bunch of setText stuff in succession, and end up with only "g". That's why you need, as others said, to "append" stuff.

However, simpler than what others have said, there is only one line that you need inside this whole for loop.

display.setText(display.getText() + testarray[l]);

And that is all you need.

Upvotes: 2

Samuel
Samuel

Reputation: 4387

The best way to do this, is with a for-each loop.

Try: 

TextView tv = (TextView) findViewById(R.id.TextView);
String testarray[] = {"a","s","d","f","g"};

String print = "";
  for(String s : testarray) {
    print += s;
  }

tv.setText(print)

This will print out asdfg

The problem in your code is you initialize the variable WITHIN the for loop, meaning for each time it goes through, it remakes the String = "", to fix this initialize it like I do in my example. Also, don't set the textview until after the loop.

If you're not familiar with the for-each loop, its basically:

for each ( object x in objectArray)
  do this

EDIT:

System.out.println() != .setText()

.setText() SETS the text of the view, every time you reset the text, you do exactly that, remove the old text, and add the new

Upvotes: 2

Dharmendra
Dharmendra

Reputation: 34026

You are doing wrong way.You are initializing the temp string with empty string in for loop. So every time it will be assign empty string and then you are concating the string from array so temp string will have only String which you are assigning from array and then you are displaying on textview.

This way you can set all the character by creating string on Textview

String testarray[]={"a","s","d","f","g"};
String temp="";

for(int l=0; l<testarray.length; l++){
   temp=temp+testarray[l];
}

display.setText(temp);

Upvotes: 0

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