• 打开应用详情设置权限等
  Intent i = new Intent("android.settings.APPLICATION_DETAILS_SETTINGS");

    String pkg = "com.android.settings";
    String cls = "com.android.settings.applications.InstalledAppDetails";
  
    i.setComponent(new ComponentName(pkg, cls));
    i.setData(Uri.parse("package:" +mActivity.getPackageName()));
    startActivity(i);
  

• 检测下的apk版本等

    /**
     * 检测已经下载的版本
     * @return 是否下载
     */
    public boolean checkDownload() {
    PackageManager pm = this.getPackageManager();
    PackageInfo packageInfo = pm.getPackageArchiveInfo(saveFileName, PackageManager.GET_ACTIVITIES);
    if (packageInfo != null) {
        ApplicationInfo appInfo = packageInfo.applicationInfo;
  
        /**获取apk的图标 */
        appInfo.sourceDir = saveFileName;
        appInfo.publicSourceDir = saveFileName;
        Drawable apk_icon = appInfo.loadIcon(pm);
        /** 得到包名 */
        String packageName = packageInfo.packageName;
        /** apk的绝对路径 */
        /** apk的版本名称 String */
        String versionName = packageInfo.versionName;
        /** apk的版本号码 int */
        int versionCode = packageInfo.versionCode;
        /**安装处理类型*/
        ToastUtil.showToast(versionCode + "apk" + versionName + packageName);
    }
  

• 应用间跳转 （跳转到百度地图为例）

         Intent intent = new Intent();
            intent.setData(Uri.parse("baidumap://map/newsassistant"));
            String path = Environment.getDataDirectory().getPath();
            if (new File(path +"/data/"+ "com.baidu.BaiduMap").exists())   { 
       --最好通过获取已经下载的应用包名来遍历判断，这样判断如果apk卸载不干净也会存在包名🤐
        //                startActivity(intent);
            } else {
                ToastUtil.showToast("未安装百度地图");
            }
            return true;
        } else {
            ToastUtil.showToast("meiyou开始下载");
            return false;
        }