Using Concatenated Strings for

Question

I'm trying to port a project I did in JavaScript to Java (Android), and I'm having trouble figuring out how to do certain things in Java and Android Studio that were different in JS. Right now I'm trying to figure out how to do this fix I had in the original JS program that took advantage of the naming convention I used to let me loop through each text label.

    for(var i = 0; i <= 5; i++)
    {
        for(var j = 0; j <= 5; j++)
        {
             setText("lbl" + i + j, text);
        }
    }

If I had label00 - label12, this could loop through all of them and set text accordingly, but I don't know how to adapt this to the setText method in Android Studio.I wanted to try something like this, but it's saying "Identifier Expected" where the findViewById command has quotes after the second period.

    TextView lblID = (TextView) findViewById(R.id."lbl" + i + j);
    lblID.setTextColor(Color.parseColor("#186cb3"));

Most of the UI control was based on this principal, so I need something similar if I can't get this working.

Is this java or javascript? They are about as similar as Austria and Australia. — Joe C
– Joe C, Commented Sep 24, 2017 at 18:09
@JoeC Seems clear by reading the question that OP is asking about porting behaviour they wrote in JavaScript to Java. — faintsignal
– faintsignal, Commented Sep 24, 2017 at 18:12

Ivar · Accepted Answer · 2017-10-22 18:05:49Z

2

This is definitely not the right way for you to port from JavaScript to Android (with Java). The findViewById() method is used to find a certain view on the root layout of your screen using a specified id, it is not for setting text. You need to create a new TextView dynamically:

TextView textView = new TextView();
textView.setText("lbl" + i + j);
setTextColor(parseColor("#186cb3"));

then add the textView to the parent view of your layout:

parentView.addView(textView);

The parentView is usually the viewGroup on your activity layout file eg. RelativeLayout, LinearLayout. You need to give it an id and get an instance of it like this:

RelativeLayout parentView = (RelativeLayout) 
     findViewById(R.id.parent_view_id);

edited Oct 22, 2017 at 18:05

Ivar

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answered Sep 24, 2017 at 18:31

danijax

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3 Comments

mrid Over a year ago

Gave you +1 for the explanation

RhythmicChaos Over a year ago

I don't think I should need to create textViews. I've created all that I need in the layout editor, and I wanted to access and change all of them in a quick way, so I wanted to do so as I did in JS, but can't figure how.

danijax Over a year ago

Oh i see, if you already have them in the layout, then you should get the instance in your activity by using findViewById(R.id.text_view_id) like this: TextView textView = (TextView) findViewById(R.id.text_view_id); textView.setText(text);

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