android 7.0+下载安装

1 添加文件在res/xml provider_paths.xml

添加检查权限

if (ActivityCompat.checkSelfPermission(BAFMainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(BAFMainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_READ_PHONE_STATE);
                }

返回

 @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case REQUEST_READ_PHONE_STATE:
                if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {


                }
                break;
            default:
                break;
        }
    }

判断是否7.0+版本

if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.N) {

            Uri contentUri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID+".fileprovider",apkFile);

            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(contentUri,"application/vnd.android.package-archive");

        }else{

            Uri uri = Uri.parse("file://" + apkFile.toString());
            intent.setDataAndType(uri, "application/vnd.android.package-archive");
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        }

关于权限的问题，如果发现可以下载但是不能正常安装，请在manifest添加