Get Display Size in Android

CameraPreview.java

package net.aldemir.myapp.camera;

import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Point;
import android.hardware.Camera;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Display;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;
import android.view.WindowManager;

import java.util.List;

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {

    public int getDisplaySize() {

        WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        int height = size.y;

    }
}

MyActivity.java

package net.aldemir.myapp.gui.activity;

import android.graphics.Point;
import android.os.Bundle;
import android.view.Display;

import at.ingdiba.ingdibaapp.R;
import at.ingdiba.ingdibaapp.gui.activity.base.BaseActionBarActivity;

public class MyActivity extends BaseActionBarActivity {
    @Override
    public void onCreate(Bundle state) {
        super.onCreate(state);
        setContentView(R.layout.activity_barcode_reader);

        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        int height = size.y;
    }
}