Check if android device is tablet or smartphone

AndroidDevice.java

DisplayMetrics metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

float yInches= metrics.heightPixels/metrics.ydpi;
float xInches= metrics.widthPixels/metrics.xdpi;
double diagonalInches = Math.sqrt(xInches*xInches + yInches*yInches);
if (diagonalInches>=6.5){
    // 6.5inch device or bigger
}else{
    // smaller device
}