Measure Device Density Idependence

There are multiple devices having different densities, So this is way by which we can measure which devices fall in which density.
Screen density is a ratio of resolution and display size.


Different sizes and densities are roughly categorized into the different size and density groups.

MainActivity.java

package com.demo.density.independence;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

import static android.widget.Toast.LENGTH_LONG;
import static android.widget.Toast.makeText;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getDensityIndependenceDevice();
    }

    private void getDensityIndependenceDevice() {
        DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        int density = displayMetrics.densityDpi;
        switch (density){
            case DisplayMetrics.DENSITY_LOW:
                showDensity("DENSITY_LOW",density);
                break;
            case DisplayMetrics.DENSITY_MEDIUM:
                showDensity("DENSITY_MEDIUM", density);
                break;
            case DisplayMetrics.DENSITY_HIGH:
                showDensity("DENSITY_HIGH",density);
                break;
            case DisplayMetrics.DENSITY_XHIGH:
                showDensity("DENSITY_XHIGH", density);
                break;
            case DisplayMetrics.DENSITY_XXHIGH:
                showDensity("DENSITY_XXHIGH", density);
                break;
            case DisplayMetrics.DENSITY_XXXHIGH:
                showDensity("DENSITY_XXXHIGH", density);
                break;
            case DisplayMetrics.DENSITY_560:
                showDensity("DENSITY_560", density);
                break;
            case DisplayMetrics.DENSITY_420:
                showDensity("DENSITY_420", density);
                break;
        }

        float densityPxPerDp = displayMetrics.density;
        float densityPxPerSp = displayMetrics.scaledDensity;
        float densityBucketDpi = displayMetrics.densityDpi;
        float xdpi = displayMetrics.xdpi;
        float ydpi = displayMetrics.ydpi;

    }

    private void showDensity(String densityString, int density) {
        TextView densityTextView= (TextView) findViewById(R.id.tvDensity);
        densityTextView.setText(String.format("%s... Density is %s", densityString, String.valueOf(density)));
        makeText(this, densityString + "... Density is " + String.valueOf(density), LENGTH_LONG).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main"
        />

</android.support.design.widget.CoordinatorLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity"
    tools:showIn="@layout/activity_main">

    <TextView
        android:id="@+id/tvDensity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/black" />

</RelativeLayout>