Get the Width and Height of screen in android

public class MainActivity extends Activity {
private TextView tvheight, tvwidth;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tvheight = (TextView) findViewById(R.id.textView1);
tvwidth = (TextView) findViewById(R.id.textView2);

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

int height = metrics.heightPixels;
int width = metrics.widthPixels;

tvheight.setText("Height --> " + String.valueOf(height));
tvwidth.setText("  Width --> " + String.valueOf(width));

}

}