public class MainActivity extends AppCompatActivity {

private Context mContext;

private TextView tv_gradient;

private Button btn_apply;

private RadioGroup mradio_roup;

private int mWidth;

private int mHeight;

private Random mRandom = new Random();

private Shader shader;

private GradientManager mGradientManager;

@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

tv_gradient = (TextView) findViewById(R.id.tv);

btn_apply = (Button) findViewById(R.id.btn);

mradio_roup = (RadioGroup) findViewById(R.id.rg);

// Set a click listener for Button widget

btn_apply.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

// Get the TextView width and height in pixels

mWidth = tv_gradient.getWidth();

mHeight = tv_gradient.getHeight();

Point size = new Point(mWidth,mHeight);

// Initializing a new instance of GradientManager class

mGradientManager = new GradientManager(mContext,size);

// Get a random indicator to define next gradient type

int indicator = mRandom.nextInt(3);

if(indicator == 0){

shader = mGradientManager.getRandomLinearGradient();

tv_gradient.setText("Linear Gradient");

}else if(indicator == 1){

shader = mGradientManager.getRandomRadialGradient();

tv_gradient.setText("Radial Gradient");

}else {

shader = mGradientManager.getRandomSweepGradient();

tv_gradient.setText("Sweep Gradient");

}

tv_gradient.setLayerType(View.LAYER_TYPE_SOFTWARE,null);

tv_gradient.getPaint().setShader(shader);

}

});

// Set a checked change listener for RadioGroup

mradio_roup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup radioGroup, int i) {

if (i == R.id.rb_normal) {

// Remove the mask filter

tv_gradient.getPaint().setMaskFilter(null);

} else if (i == R.id.rb_emboss) {

EmbossMaskFilter embossFilter = new EmbossMaskFilter(

new float[]{1f, 5f, 1f}, // direction of the light source

0.8f, // ambient light between 0 to 1

8, // specular highlights

7f // blur before applying lighting

);

// Apply the emboss mask filter

tv_gradient.getPaint().setMaskFilter(embossFilter);

} else if (i == R.id.rb_deboss) {

EmbossMaskFilter debossFilter = 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

);

// Apply the deboss mask filter

tv_gradient.getPaint().setMaskFilter(debossFilter);

}

}

});

}

}