通过请求获取了123.apk包，保存在文件中，通过下面的方法去安装的时候提示解析包失败，我去文件夹下面手动安装123.apk可以安装成功，怎么解决。
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), "123.apk")),
"application/vnd.android.package-archive");
startActivity(intent);
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Found it to be a permissions issue.
After checking the information, I found this: fileOutputStream = openFileOutput("YouPaoPao.apk", MODE_WORLD_READABLE);
Write in this form when writing files, and no parsing package errors will be reported when reading and installing.