android - How to apply deboss text effect

activity_main.xml 
 <?xml version="1.0" encoding="utf-8"?> <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="16dp"     tools:context=".MainActivity"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="ABCDEFG"         android:textSize="100dp"         android:textStyle="bold"         android:textColor="#8f9e92"         android:fontFamily="sans-serif-condensed"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_below="@id/tv"         android:text="Deboss The Text"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcode;  import android.content.Context; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; import android.graphics.EmbossMaskFilter;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private TextView tv;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Get the widgets reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         tv = (TextView) findViewById(R.id.tv);         Button btn = (Button) findViewById(R.id.btn);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 /*                     MaskFilter                         MaskFilter is the base class for object that perform transformations on an                         alpha-channel mask before drawing it. A subclass of MaskFilter may be installed                         into a Paint. Blur and emboss are implemented as subclasses of MaskFilter.                 */                 /*                     public EmbossMaskFilter (float[] direction, float ambient, float specular,                         float blurRadius)                      Create an emboss maskfilter                      Parameters                         direction : array of 3 scalars [x, y, z] specifying the direction of the                             light source                         ambient : 0...1 amount of ambient light                         specular : coefficient for specular highlights (e.g. 8)                         blurRadius : amount to blur before applying lighting (e.g. 3)                     Returns                         the emboss maskfilter                 */                 EmbossMaskFilter filter = new EmbossMaskFilter(                         new float[]{ 0f, -1f, 0.5f }, // direction of the light source                         0.8f, // ambient light between 0 to 1                         13, // specular highlights                         7.0f // blur before applying lighting                 );                  // Set the TextView layer type to software                 tv.setLayerType(View.LAYER_TYPE_SOFTWARE,null);                  // Finally, make the TextView text effect deboss.                 tv.getPaint().setMaskFilter(filter);             }         });     } }
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