效果如图，返回list：

代码如下：

package com.java.app01;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class GetScreenSize {
    public static void main(String[] args) {
        ArrayList<String> screenSize = getScreenSize();
        System.out.println(screenSize);
    }

    public static ArrayList<String> getScreenSize() {
        Runtime runtime = Runtime.getRuntime();
        ArrayList<String> list = new ArrayList<>();
        try {
            Process wmSize = runtime.exec("adb shell wm size");
            InputStream inputStream = wmSize.getInputStream();
            InputStreamReader reader = new InputStreamReader(inputStream);
            BufferedReader bf = new BufferedReader(reader);
            String mark;
            StringBuilder buffer = new StringBuilder();
            while ((mark = bf.readLine()) != null) {
                buffer.append(mark);
            }
            String s = buffer.toString();
            for (String size : s.replaceAll("[^0-9]", ",").split(",")) {
                if (size.length() > 0)
                    list.add(size);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return list;

    }
}