android多屏适配

现在通用的多屏适配有如下三种

1.match_parent2.weight3.多个文件夹（small，normal，large，and extra large），然后分别给出（计算）控件大小

第一个和第二个比较好理解,但是应用范围比较窄.比如我需要一个长宽均为屏幕一半的button并且要在屏幕正中间.用match_parent肯定不行,用weight可以倒是可以,但是不觉得还要多用好几个控件把空白地方撑满不方便吗?这只是个demo,如果在项目中呢?那么就只能采用第三种

参考文章:
http://blog.csdn.net/lmj623565791/article/details/45460089
http://www.cnblogs.com/soaringEveryday/p/4835839.html

接下来我就讲讲具体怎么做

1.计算屏幕的宽和高

        DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        int width = dm.widthPixels; // 得到宽度        int height = dm.heightPixels; // 得到高度        Log.e("DisplayMetrics", height + "*" + width);

2.用GenerateValueFiles.java（Java工程）生成对应的values文件夹

这个文件我是从参考文章中拿下来并且修改过的.为了区分横屏还是竖屏,我把竖屏的文件夹名字添加了land标记
输入一次w和h
输出两个文件夹values-h*w(竖屏专用)和values-land-w*h(横屏)，每次只要选一个就行

3.把values文件夹copy进android工程

接下来我用虚拟机演示一下

（1）横屏

数据显示w=2560,h=1504
GenerateValueFiles文件的main函数指明了参数的规则

所以

private static final String SUPPORT_DIMESION = "2560,1504;";

生成的文件夹如下

由于这是横屏，所以只需要values-land-2560x1504这个文件夹

（2）竖屏

ctrl+F11切换竖屏

GenerateValueFiles文件里面

private static final String SUPPORT_DIMESION = "2560,1504;1600,2464;";

生成的文件夹

这次我只需要黑色的文件夹

（3）展示

android工程的文件夹res目录如下，就是多了两个对应的文件夹

布局文件如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    tools:context="com.example.multiscreen.MainActivity" >    <Button        android:layout_width="@dimen/x160"        android:layout_height="@dimen/y240"        android:gravity="center"        android:text="Button" /></RelativeLayout>

参考文章里说的很清楚，把宽度分成320分，那么160份就是整个屏幕的一半

运行看效果

忘了把GenerateValueFiles.java代码贴出来

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 POTARIT_VALUE_TEMPLATE = "values-{0}x{1}";    /**     * {0}-WIDTH     */    private final static String LAND_VALUE_TEMPLATE = "values-land-{0}x{1}";    private static final String SUPPORT_DIMESION = "2560,1504;1600,2464;";    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(",");            generatePotraitXmlFile(Integer.parseInt(wh[0]),                    Integer.parseInt(wh[1]));            generateLandXmlFile(Integer.parseInt(wh[0]),                    Integer.parseInt(wh[1]));        }    }    /**     * 竖屏     */    private void generatePotraitXmlFile(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                + POTARIT_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();        }    }    /**     * 横屏     */    private void generateLandXmlFile(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                + LAND_VALUE_TEMPLATE.replace("{0}", w + "")//                        .replace("{1}", h + ""));        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();    }}