Android 安装asset下的apk

public class ServiceApkInstaller {
    /**
     * 保存到本地
     *
     * @param context
     * @param fileName assets下的文件名
     * @param path     存储路径
     */
    public void copyApkFromAssets(Activity context, String fileName, String path) {
        try {
            Logger.e("开始");
            InputStream is = context.getAssets().open(fileName);
            File file = new File(path);
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            byte[] temp = new byte[1024];
            int i = 0;
            while ((i = is.read(temp)) > 0) {
                fos.write(temp, 0, i);
            }
            fos.close();
            is.close();
            installApk(file, context);
            Logger.e("完成");
        } catch (IOException e) {
            e.printStackTrace();
            Logger.e("" + e.getMessage());
        }
    }
    /**
     * 安装apk （注意在安装apk时的Android7.0配置path的问题）
     *
     * @param file
     * @param c
     */
    private void installApk(File file, Activity c) {
        if (!file.exists()) {
            return;
        }
        Intent intent = new Intent(Intent.ACTION_VIEW);
        //判断是否是AndroidN以及更高的版本
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            Uri contentUri = FileProvider.getUriForFile(c, BuildConfig.APPLICATION_ID + ".fileprovider", file);
            intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        }
        c.startActivityForResult(intent, 88);
    }