CODEWITHSUNDEEP
javaandroidandroid-widgettextview
scheffetz
scheffetz

Reputation: 55

Android TextView id with a variable?

In my Android application, is there a way I can set the text to a textview by using a variable as part of the id?

I am trying to do something like this:

for (int i = 1; i < 6; i++){
                views.setTextViewText(R.id.textView+i, "" + realtimeData.get(i).id);
            }

I do have the TextViews declared in the layout xml as textView1, textView2, etc... and can access them with the static name. My issue is I do not know how many objects will be in my list. I do not want to display more than 5, but if there are fewer than 5 its ok for the TextView value to be left blank.

Upvotes: 4

Views: 3351

Answers (4)

Joshua Pinter
Joshua Pinter

Reputation: 47471

Less Issues

Using getIdentifier() was causing me grief so I ended up with the following:

String idName = "companyName";   // The id name of your resource.

int resourceId = R.id.class.getField(idName).getInt(null);

Upvotes: 0

thedayofcondor
thedayofcondor

Reputation: 3876

Provided you keep a thigh control over your R file to make sure your IDs are consecutive, you could try something like:

for (int i = R.id.firstTextView; i <= R.id.lastTextView; i++){
    views.setTextViewText(i, "" + realtimeData.get(i).id);
}

which would allow to just add IDs to the R file without having to modify your code to change the hardcoded 6 number.

Just to prove my point:

<TextView android:id="@+id/testStart" />
<TextView android:id="@+id/test2" />
<TextView android:id="@+id/test3" />
<TextView android:id="@+id/testEnd" />
<Button android:id="@+id/button1" />

generates:

    public static final int button1=0x7f070004;
    public static final int menu_settings=0x7f070005;
    public static final int test2=0x7f070001;
    public static final int test3=0x7f070002;
    public static final int testEnd=0x7f070003;
    public static final int testStart=0x7f070000;

Adding at a later stage:

 <TextView android:id="@+id/test4" />

right before 

    <TextView android:id="@+id/testEnd" />

immediately changes R.java to:

    public static final int button1=0x7f070005;
    public static final int menu_settings=0x7f070006;
    public static final int test2=0x7f070001;
    public static final int test3=0x7f070002;
    public static final int test4=0x7f070003;
    public static final int testEnd=0x7f070004;
    public static final int testStart=0x7f070000;

Upvotes: -1

wtsang02
wtsang02

Reputation: 18863

+1 to Luksprog , However I feel that "i<6" isn't the right way to go, Instead use ViewGroup.getChildCount() and ViewGroup.getChildAt(int) so you can control your amount of textviews better.

Upvotes: 2

user
user

Reputation: 87064

You're looking for the getIdentifier() method:

for (int i = 1; i < 6; i++){
     views.setTextViewText(getResources().getIdentifier("textView" + i, "id", getPackageName()), "" + realtimeData.get(i).id);
}

Upvotes: 7

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