android - How to convert dp to pixels

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#fbffef"     android:animateLayoutChanges="true"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Convert DP to Pixels"         />     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:fontFamily="Sans-Serif-Condensed"         android:textSize="17dp"         android:layout_below="@id/btn"         android:textStyle="italic"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.content.res.Resources; import android.os.Bundle; import android.app.Activity; import android.util.TypedValue; import android.view.View; import android.widget.Button;  import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends Activity {      protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         simpulan Button btn = (Button) findViewById(R.id.btn);         simpulan TextView tv = (TextView) findViewById(R.id.tv);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Create some integer values                 int dp_first = 25;                 int dp_second = 15;                 int dp_third = 29;                 int dp_fourth = 41;                  // Get the current Activity                 Activity activity = MainActivity.this;                  tv.setText("DIP/DP to Pixels conversion...\n");                 tv.setText(                             tv.getText()+ ""+                             dp_first+ "dp = "+ getPixelsFromDPs(activity,dp_first) + "pixels\n"                             +dp_second+ "dp = "+ getPixelsFromDPs(activity,dp_second) + "pixels\n"                             +dp_third+ "dp = "+ getPixelsFromDPs(activity,dp_third) + "pixels\n"                             +dp_fourth+ "dp = "+ getPixelsFromDPs(activity,dp_fourth) + "pixels\n"                             );             }         });     }      // Method for converting DP/DIP value to pixels     public static int getPixelsFromDPs(Activity activity, int dps){         /*             public abstract Resources getResources ()                  Return a Resources instance for your application's package.         */         Resources r = activity.getResources();          /*             TypedValue                  Container for a dynamically typed data value. Primarily                 used with Resources for holding resource values.         */          /*             applyDimension(int unit, float value, DisplayMetrics metrics)                  Converts an unpacked complex data value holding                 a dimension to its simpulan floating point value.         */          /*             Density-independent pixel (dp)                  A virtual pixel unit that you should use when defining UI layout,                 to express layout dimensions or position in a density-independent way.                  The density-independent pixel is equivalent to one physical pixel on                 a 160 dpi screen, which is the baseline density assumed by the system                 for a "medium" density screen. At runtime, the system transparently handles                 any scaling of the dp units, as necessary, based on the actual density                 of the screen in use. The conversion of dp units to screen pixels                 is simple: px = dp * (dpi / 160). For example, on a 240 dpi screen,                 1 dp equals 1.5 physical pixels. You should always use dp                 units when defining your application's UI, to ensure proper                 display of your UI on screens with different densities.         */          /*             public static simpulan int COMPLEX_UNIT_DIP                  TYPE_DIMENSION complex unit: Value is Device Independent Pixels.                 Constant Value: 1 (0x00000001)         */         int  px = (int) (TypedValue.applyDimension(                 TypedValue.COMPLEX_UNIT_DIP, dps, r.getDisplayMetrics()));         return px;     } }
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