Android开发系统工具类SysUtils：获取App版本号、SD卡目录、缓存目录、是否后台运行、前台可见

最新推荐文章于 2021-05-26 05:40:36 发布

原创最新推荐文章于 2021-05-26 05:40:36 发布 · 877 阅读

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本文介绍了Android开发中的SysUtils工具类，包括获取App版本号、SD卡目录、缓存目录、检测应用是否在后台运行以及是否前台可见等实用方法的实现。

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public class SysUtils {
    private static final String TAG = "SysUtils";
    private SysUtils() {
    }

    /**获取版本号
     * @param context
     * @return
     */
    public static String getVersionName(Context context) {
        PackageManager pkgMng = context.getPackageManager();
        PackageInfo pkgInfo = null;
        try {
            pkgInfo = pkgMng.getPackageInfo(context.getPackageName(), 0);
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return pkgInfo != null ? pkgInfo.versionName : "";
    }
    /**
     * 获取SD卡目录
     * @return 如果没有SD卡就返回null
     */
    public static String getSdDir() {
        boolean sdCardExist = Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED); // 判断sd卡是否存在
        if (sdCardExist) {
            return Environment.getExternalStorageDirectory().toString(); // 获取目录
        }
        return null;
    }
    /**
     * 获取应用缓存目录
     * @param context
     * @return
     */
    public static String getCacheDir(Context context) {
        return context.getCacheDir().toString();
    }
    /**获取应用的语言
     * @param context
     * @return
     */
    public static String getLanguage(Context context) {
        Locale locale = context.getResources().getConfiguration().locale;
        return locale.getLanguage();
    }
    /**
     * 判断程序是否在后台运行
     * @param context
     * @return
     */
    public static boolean isBackground(Context context) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningAppProcessInfo> appProcesses = activityManager
                .getRunningAppProcesses();
        for (RunningAppProcessInfo appProcess : appProcesses) {
            if (appProcess.processName.equals(context.getPackageName())) {
                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
                    return true;
                } else {
                    return false;
                }
            }
        }
        return false;
    }

    /**判断app是否前台可见
     * @param context
     * @return
     */
    public static boolean isVisible(Context context) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningAppProcessInfo> appProcesses = activityManager
                .getRunningAppProcesses();
        for (RunningAppProcessInfo appProcess : appProcesses) {
            if (appProcess.processName.equals(context.getPackageName())) {
                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_VISIBLE ||
                        appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                    return true;
                } else {
                    return false;
                }
            }
        }
        return false;
    }
}