简单谈谈我的Android屏幕适配之路

public static int dp2px(Context context, float dipValue) {  
   final float scale = context.getResources().getDisplayMetrics().density;  
   return (int) (dipValue * scale + 0.5f);  
}

public class CreatedimenUtil {
  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 CreatedimenUtil(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 = 400;
    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 CreatedimenUtil(baseW, baseH, addition).generate();
  }
}

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;";

int baseW = 320;
int baseH = 400;