Android 8.0升级不跳转应用安装页面的解决方法

<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" /> 

/** 
  * 打开安装包 
  * 
  * @param mContext 
  * @param fileUri 
  */ 
  public void openAPKFile(Activity mContext, String fileUri) { 
    DataEmbeddingUtil.dataEmbeddingAPPUpdate(fileUri); 
    // 核心是下面几句代码 
    if (null != fileUri) { 
      try { 
        Intent intent = new Intent(Intent.ACTION_VIEW); 
        File apkFile = new File(fileUri); 
        //兼容7.0 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { 
          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"); 
          //兼容8.0 
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { 
            boolean hasInstallPermission = mContext.getPackageManager().canRequestPackageInstalls(); 
            if (!hasInstallPermission) { 
              ToastUtil.makeText(MyApplication.getContext(), MyApplication.getContext().getString(R.string.string_install_unknow_apk_note), false); 
              startInstallPermissionSettingActivity(); 
              return; 
            } 
          } 
        } else { 
          intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive"); 
          intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
        } 
        if (mContext.getPackageManager().queryIntentActivities(intent, 0).size() > 0) { 
          mContext.startActivity(intent); 
        } 
      } catch (Throwable e) { 
        e.printStackTrace(); 
        DataEmbeddingUtil.dataEmbeddingAPPUpdate(e.toString()); 
        CommonUtils.makeEventToast(MyApplication.getContext(), MyApplication.getContext().getString(R.string.download_hint), false); 
      } 
    } 
  } 
 
 
  /** 
  * 跳转到设置-允许安装未知来源-页面 
  */ 
  @RequiresApi(api = Build.VERSION_CODES.O) 
  private void startInstallPermissionSettingActivity() { 
    //注意这个是8.0新API 
    Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES); 
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    mContext.startActivity(intent); 
  }