安卓获取包名，版本号，

private String getAppInfo() {
    try {
        String pkName = this.getPackageName();
        String versionName = this.getPackageManager().getPackageInfo(
                pkName, 0).versionName;
        int versionCode = this.getPackageManager()
                .getPackageInfo(pkName, 0).versionCode;
        return pkName + "   " + versionName + "  " + versionCode;
    } catch (Exception e) {
    }
    return null;
}