Android apk安装

/**
     * 兼容8.0的安装apk
     * @param context
     * @param filePath
     */
    public static void installApkComp(Context context,String filePath) throws FileNotFoundException
        ,NullPointerException{
        if (filePath == null || "".equals(filePath)) {
            throw new NullPointerException("路径字符是null");
        }
        File file = new File(filePath);
        if (!file.exists()) {
             throw new FileNotFoundException("文件不存在");
        }
        if (Build.VERSION.SDK_INT >= 26) {
            boolean b = context.getPackageManager().canRequestPackageInstalls();
            if (b) {
                installApk(context,filePath);
                //安装应用的逻辑(写自己的就可以)
            } else {
                //设置安装未知应用来源的权限
                Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
            }
        } else {
            installApk(context,filePath);
        }
    }

/**
     * 安装apk,私有目录
     * @param mContext
     * @param filePath
     */
    public static void installApk(Context mContext,String filePath){
        File apkFile = new File(filePath);
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Log.w(TAG, "版本大于 N ，开始使用 fileProvider 进行安装");
            intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            Uri contentUri = FileProvider.getUriForFile(
                    mContext
                    , mContext.getPackageName()+".fileprovider"
                    , apkFile);
            intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
        }
        mContext.startActivity(intent);
    }