由于Android系统的开放性,任何用户、开发者、OEM厂商、运营商都可以对Android进行定制,于是导致:
Android系统碎片化:小米定制的MIUI、魅族定制的flyme、华为定制的EMUI等等

在实际界面开发当中,一般流程是这样的:
1.UI设计师基于854x480手机设计了一套图,并给出了标注。
2.开发人员将标注转换为dp写到布局文件中。
3.在854x480分辨率的手机上测试界面效果,不出意外应该是跟设计图基本一致的。
但是,如果将程序运行到1920x1080分辨率,但是密度为240(hdpi)的设备上,位置就会错乱(当然实际开发中会把上图中的按钮的宽度设置为match_parent,这里只是为了说明问题)。
界面布局简单了还好,我们可以通过调整,使用相对布局以及match_parent等手段将界面调整的比较好看。但是如果界面元素比较多了,有时候我们必须给某个控件设置一个固定尺寸,所以肯定避免不了这种问题的出现。

所以UI设计师可能会提出如下几个要求:
1.设计师基于720P(1280x720)设计一套图,并标注
2.研发开发出来的实际效果在720P手机上必须跟标注一致(要求高的公司甚至精确到像素)
3.如果在480P、1080p手机上,则实际尺寸按标注等比例缩放。比如在720p上的标注是100px,那么显示到1080p手机上必须是100*1080/720 = 150px。
4.对于非标准分辨率来说,比如1184x720(手机底部带虚拟按键的那种),则需要在高度上做调整,给控件的纵向间隙做些调整。

总之处理的不好就会带来非常差的UI效果

所以针对如上要求,结合android屏幕适配的机制,可以采用如下方案来适配:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;

/**
 * Time:2018/88.
 * Email:1424817390@qq.com
 * Description:生产dimens文件
 */

public class GenerateValueFiles {
    private int baseW;
    private int baseH;

    private String dirStr = "./res";

    private final static String WTemplate = "<dimen name=\"x{0}\">{1}px</dimen>\n";
    private final static String HTemplate = "<dimen name=\"y{0}\">{1}px</dimen>\n";

    /**
     * {0}-HEIGHT
     */
    private final static String VALUE_TEMPLATE = "values-{0}x{1}";

    private static final String SUPPORT_DIMESION = "320,480;480,800;480,854;540,960;600,1024;720,1184;720,1196;720,1280;768,1024;800,1280;1080,1812;1080,1920;1440,2560;";

    private String supportStr = SUPPORT_DIMESION;

    public GenerateValueFiles(int baseX, int baseY, String supportStr) {
        this.baseW = baseX;
        this.baseH = baseY;

        if (!this.supportStr.contains(baseX + "," + baseY)) {
            this.supportStr += baseX + "," + baseY + ";";
        }

        this.supportStr += validateInput(supportStr);

        System.out.println(supportStr);

        File dir = new File(dirStr);
        if (!dir.exists()) {
            dir.mkdir();

        }
        System.out.println(dir.getAbsoluteFile());

    }

    /**
     * @param supportStr w,h_...w,h;
     * @return
     */
    private String validateInput(String supportStr) {
        StringBuffer sb = new StringBuffer();
        String[] vals = supportStr.split("_");
        int w = -1;
        int h = -1;
        String[] wh;
        for (String val : vals) {
            try {
                if (val == null || val.trim().length() == 0)
                    continue;

                wh = val.split(",");
                w = Integer.parseInt(wh[0]);
                h = Integer.parseInt(wh[1]);
            } catch (Exception e) {
                System.out.println("skip invalidate params : w,h = " + val);
                continue;
            }
            sb.append(w + "," + h + ";");
        }

        return sb.toString();
    }

    public void generate() {
        String[] vals = supportStr.split(";");
        for (String val : vals) {
            String[] wh = val.split(",");
            generateXmlFile(Integer.parseInt(wh[0]), Integer.parseInt(wh[1]));
        }

    }

    private void generateXmlFile(int w, int h) {

        StringBuffer sbForWidth = new StringBuffer();
        sbForWidth.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
        sbForWidth.append("<resources>");
        float cellw = w * 1.0f / baseW;

        System.out.println("width : " + w + "," + baseW + "," + cellw);
        for (int i = 1; i < baseW; i++) {
            sbForWidth.append(WTemplate.replace("{0}", i + "").replace("{1}",
                    change(cellw * i) + ""));
        }
        sbForWidth.append(WTemplate.replace("{0}", baseW + "").replace("{1}",
                w + ""));
        sbForWidth.append("</resources>");

        StringBuffer sbForHeight = new StringBuffer();
        sbForHeight.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
        sbForHeight.append("<resources>");
        float cellh = h * 1.0f / baseH;
        System.out.println("height : " + h + "," + baseH + "," + cellh);
        for (int i = 1; i < baseH; i++) {
            sbForHeight.append(HTemplate.replace("{0}", i + "").replace("{1}",
                    change(cellh * i) + ""));
        }
        sbForHeight.append(HTemplate.replace("{0}", baseH + "").replace("{1}",
                h + ""));
        sbForHeight.append("</resources>");

        File fileDir = new File(dirStr + File.separator
                + VALUE_TEMPLATE.replace("{0}", h + "")//
                .replace("{1}", w + ""));
        fileDir.mkdir();

        File layxFile = new File(fileDir.getAbsolutePath(), "lay_x.xml");
        File layyFile = new File(fileDir.getAbsolutePath(), "lay_y.xml");
        try {
            PrintWriter pw = new PrintWriter(new FileOutputStream(layxFile));
            pw.print(sbForWidth.toString());
            pw.close();
            pw = new PrintWriter(new FileOutputStream(layyFile));
            pw.print(sbForHeight.toString());
            pw.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static float change(float a) {
        int temp = (int) (a * 100);
        return temp / 100f;
    }

    public static void main(String[] args) {
        int baseW = 320;
        int baseH = 480;
        String addition = "";
        try {
            if (args.length >= 3) {
                baseW = Integer.parseInt(args[0]);
                baseH = Integer.parseInt(args[1]);
                addition = args[2];
            } else if (args.length >= 2) {
                baseW = Integer.parseInt(args[0]);
                baseH = Integer.parseInt(args[1]);
            } else if (args.length >= 1) {
                addition = args[0];
            }
        } catch (NumberFormatException e) {

            System.err
                    .println("right input params : java -jar xxx.jar width height w,h_w,h_..._w,h;");
            e.printStackTrace();
            System.exit(-1);
        }

        new GenerateValueFiles(baseW, baseH, addition).generate();
    }
}

直接运行该类,方可!!!!