query system features from package manager

querySystemFeatures.java

import android.content.pm.PackageManager;
import android.content.pm.FeatureInfo;
import android.util.Log;

    // $ adb shell pm list features
    private void querySystemFeatures() {
        static final String APP_TAG = "app_tag";
        final PackageManager pm = getPackageManager();
        final FeatureInfo[] featuresList = pm.getSystemAvailableFeatures();
        String feature_string = "";
        for (FeatureInfo f : featuresList) {
            if (f.name != null) {
                 feature_string += f.name + "\n";
            }
        }
        feature_string += "\n";
        Log.i(APP_TAG, "rasmus: query features: " + feature_string);
    }