android 如何获取一个程序的当前版本号

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/**     * 获取当前程序版本名     * @return     */    public static String getPackageVersion() {        String version = "";        try {            PackageManager pm = application.getPackageManager();              PackageInfo pi = null;            pi = pm.getPackageInfo(application.getPackageName(), 0);            version = pi.versionName;        } catch (Exception e) {            version = ""; // failed, ignored          }        return version;    }    /**     * 获取当前程序包名     * @return     */    public static String getPackageName() {        String version = "";        try {            PackageManager pm = application.getPackageManager();              PackageInfo pi = null;            pi = pm.getPackageInfo(application.getPackageName(), 0);            version = pi.packageName;        } catch (Exception e) {            version = ""; // failed, ignored          }        return version;    }    /**     * 获取当前程序版本code     * @return     */    public static String getPackageCode() {        String code = "";        try {            PackageManager pm = application.getPackageManager();              PackageInfo pi = null;            pi = pm.getPackageInfo(application.getPackageName(), 0);            code = pi.versionName;        } catch (Exception e) {            code = "1"; // failed, ignored          }        return code;    }