docs: private void installPackage() {
          AndPermission.with(this)
              .install()
              .file(new File(Environment.getExternalStorageDirectory(), "android.apk"))
              .rationale(new InstallRationale())
              .onGranted(new Action<File>() {
                  @Override
                  public void onAction(File data) {
                      // Installing.
                  }
              })
              .onDenied(new Action<File>() {
                  @Override
                  public void onAction(File data) {
                      // The user refused to install.
                  }
              })
              .start();
      }