import android.app.Activity;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;

import java.lang.reflect.Method;

/**
 * Created by wuyongmin on 16/6/16.
 */
public class AndroidUtils {


    public AndroidUtils() {}

    /** Returns the available screensize, including status bar and navigation bar */
    public static Size getScreenSize(Activity context) {
        Display display = context.getWindowManager().getDefaultDisplay();
        int realWidth;
        int realHeight;

        if (Build.VERSION.SDK_INT >= 17) {
            DisplayMetrics realMetrics = new DisplayMetrics();
            display.getRealMetrics(realMetrics);
            realWidth = realMetrics.widthPixels;
            realHeight = realMetrics.heightPixels;

        } else if (Build.VERSION.SDK_INT >= 14) {
            try {
                Method mGetRawH = Display.class.getMethod("getRawHeight");
                Method mGetRawW = Display.class.getMethod("getRawWidth");
                realWidth = (Integer) mGetRawW.invoke(display);
                realHeight = (Integer) mGetRawH.invoke(display);
            } catch (Exception e) {
                //this may not be 100% accurate, but it's all we've got
                realWidth = display.getWidth();
                realHeight = display.getHeight();
                Log.e("Display Info", "Couldn't use reflection to get the real display metrics.");
            }

        } else {
            //This should be close, as lower API devices should not have window navigation bars
            realWidth = display.getWidth();
            realHeight = display.getHeight();
        }

        return new Size(realWidth, realHeight);
    }

    public static class Size {
        public final int width;
        public final int height;

        public Size(int width, int height) {
            this.width = width;
            this.height = height;
        }
    }
}

调用

public class MainActivity extends AppCompatActivity {

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

        AndroidUtils androidUtils = new AndroidUtils();
        AndroidUtils.Size size = androidUtils.getScreenSize(this);
        System.out.println(size.width);
        System.out.println(size.height);

    }
}