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String cachePath = (
            getExternalFilesDir("upgrade_apk") +
                File.separator +
                getPackageName() +
                ".apk");

<?xml version="1.0" encoding="utf-8"?>

  

 /**
       * 安裝 apk 文件
       *
       * @param apkFile
       */
      public void installApk(File apkFile) {
        Intent installApkIntent = new Intent();
        installApkIntent.setAction(Intent.ACTION_VIEW);
        installApkIntent.addCategory(Intent.CATEGORY_DEFAULT);
        installApkIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
          installApkIntent.setDataAndType(FileProvider.getUriForFile(getApplicationContext(), "com.apkinstall.demo.file_provider", apkFile), "application/vnd.android.package-archive");
          installApkIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        } else {
          installApkIntent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
        }

        if (getPackageManager().queryIntentActivities(installApkIntent, 0).size() > 0) {
          startActivity(installApkIntent);
        }
      }