Spinner with different dynamic textcolors, depending on the values

Question

I need my spinners to have two different textcolors (green = ok, red = not ok), depending on the "mastervalue".

For example:

If mastervalue = 1:

Spinner 1

1. (green)
2. (green)
3. (green)
4. (red)
5. (red)

Spinner 2

1. (green)
2. (red)
3. (red)
4. (red)
5. (red)

---

If mastervalue = 2:

Spinner 1

1. (green)
2. (green)
3. (green)
4. (green)
5. (green)

Spinner 2

1. (green)
2. (green)
3. (green)
4. (green)
5. (red)

So the colors have to change dynamically, every time I change the mastervalue. To check which values are green/red, I have a couple of many-to-many relationship tables in my db. I just have to find a way to set the text color for each value before/after populating a spinner.

Would be great to get some help here!

Answer 1

For your issue you simply need to create a simple custom SpinnerAdapter and manipulate it as you need:

so let's start:

1.First of all let's create a custom_spinner row (layout)

custom_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/text_main_seen"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

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2. Then you need to create a custom SpinnerAdapter (an ArrayAdapter)
   NB: You need here to modify the section start with the "coloration algorithm" to match exaclty what you are looking for.

MyAdapter.java

public class MyAdapter extends ArrayAdapter<String> {
        
        String[] spinnerValues;
        
        public MyAdapter(Context ctx, String[] objects) { 
            super(ctx, R.layout.custom_spinner, objects); 
            
            spinnerValues = objects;
        } 
        
        @Override public View getDropDownView(int position, View cnvtView, ViewGroup prnt) { 
            return getCustomView(position, cnvtView, prnt); 
        } 
        
        @Override public View getView(int pos, View cnvtView, ViewGroup prnt) { 
            return getCustomView(pos, cnvtView, prnt); 
        } 
        
        public View getCustomView(int position, View convertView, ViewGroup parent) { 
            LayoutInflater inflater = getLayoutInflater(); 
            
            View mySpinner = inflater.inflate(R.layout.custom_spinner, parent, false); 
            TextView main_text = (TextView) mySpinner .findViewById(R.id.text_main_seen); 
            
            //here you make the algorithm you want for coloration///////////////////////////
            if(spinnerValues[position].equals("blue")){
                mySpinner.setBackgroundColor(Color.BLUE);
                
            }else if(spinnerValues[position].equals("green")){
                mySpinner.setBackgroundColor(Color.GREEN);
                
            }else if(spinnerValues[position].equals("red")){
                mySpinner.setBackgroundColor(Color.RED);
            
            }else if(spinnerValues[position].equals("yellow")){
                mySpinner.setBackgroundColor(Color.YELLOW);
            }
            //end coloration algorithm//////////////////////////////////////////
            
            main_text.setText(spinnerValues[position]); 
            
            return mySpinner; 
        } 
    } 

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And finally in your activity you refere to this Adapter in your spinner:

MainActivity.java

public class MainActivity extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //values to put in the spinner
        String[] values = { "blue", "red", "green", "yellow" };
        
        //my spinner
        Spinner mySpinner = (Spinner) findViewById(R.id.spinner_show);
        
        //set MyAdaper
        mySpinner.setAdapter(new MyAdapter(this, values));

    }
}

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At the end this is a simple test if it's needed ;)

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Good luck , just let me know if anything goes wrong ;)