Add an ImageView statically in Android Studio

Issue

I want to change the resource of an image view from a variable in android studio. Let me explain you, i have first activity "selector activity" which has 21 images, on every image click, a variable god_name is changed to the particular god, now i am sending that variable using putExtra, now i want that to change the resource of an ImageView in MainActivity depending on the variable, for example if the variable is "two", then i want to change the resource to "R.drawable.two". Something like that, I have some experience in python so I used f strings there, here can I do something?

MainActivity.class (Note-I have not Included imports so the code is allowed to be uploaded.)

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String god_name = getIntent().getExtras().getString("chosen_god").toString();

        ImageView god = findViewById(R.id.god);
        god.setImageResource();
    }
}

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/black"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/god"
        android:layout_width="413dp"
        android:layout_height="496dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.666"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:srcCompat="@mipmap/hanuman" />
</androidx.constraintlayout.widget.ConstraintLayout>

I can use multiple if conditions and switch case statement but that would be so much large as I would have to write it 21 times so it is very difficult! Thanks in advance for anyone kind of help!

Solution

That sounds like you need to use the resources.getIdentifier() to make this work.

I wrote once an answer to a related topic: https://stackoverflow.com/a/4865350/180538

Anyway what you need is to pass the name of the resource and then resolve the identifier to use it. So something like this:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // make sure that god_name is the name of the resource, so AFTER R.mipmap.[resourceName]
    // so for R.mipmap.two you need to pass "two" as "chosen_god" extra
    String god_name = getIntent().getExtras().getString("chosen_god").toString();

    ImageView god = findViewById(R.id.god);
    int resId = getResources().getIdentifier(god_name, "mipmap", getPackageName());
    god.setImageResource(resId);
}

Answered By - WarrenFaith