Determines device screen size(small, normal, etc) and screen density (ldpi, mdpi, etc) and displays result in a Toast

AndroidScreenDensity.java

//Determine screen density
    DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        int density = metrics.densityDpi;

        if (density == DisplayMetrics.DENSITY_TV) {
            Toast.makeText(this, "DENSITY_TV... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_XXXHIGH) {
            Toast.makeText(this, "DENSITY_XXXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_XXHIGH) {
            Toast.makeText(this, "DENSITY_XXHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_XHIGH) {
            Toast.makeText(this, "DENSITY_XHIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_HIGH) {
            Toast.makeText(this, "DENSITY_HIGH... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_MEDIUM) {
            Toast.makeText(this, "DENSITY_MEDIUM... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else if (density == DisplayMetrics.DENSITY_LOW) {
            Toast.makeText(this, "DENSITY_LOW... Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }
        else {
            Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW.  Density is " + String.valueOf(density),  Toast.LENGTH_LONG).show();
        }

AndroidScreenSize.java

//Determine screen size
    if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {     
        Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();

    }
    else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {     
        Toast.makeText(this, "Normal sized screen" , Toast.LENGTH_LONG).show();

    } 
    else if ((getResources().getConfiguration().screenLayout &      Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {     
        Toast.makeText(this, "Small sized screen" , Toast.LENGTH_LONG).show();
    }
    else {
        Toast.makeText(this, "Screen size is neither large, normal or small" , Toast.LENGTH_LONG).show();
    }

Rather than place this file into the project, you could just copy & paste this into your MainActivity's onCreate method, to display a toast when you launch the application. I would only run half (i.e either the screen size, or the density) at a time because other wise you would have 2 toasts running simultaneously.