Android 获取手机已安装的应用列表实现详解

var queryIntentActivities = mutableListOf<ResolveInfo>()
        val intent = Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER)
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            queryIntentActivities =
                packageManager.queryIntentActivities(intent, PackageManager.MATCH_ALL)
        } else {
            queryIntentActivities = packageManager.queryIntentActivities(intent, 0)
        }

queryIntentActivities.forEach {
            bean = AppInfoBean(
                icon = it.loadIcon(packageManager),
                appName = it.loadLabel(packageManager).toString(),
                appPackageName = it.activityInfo.applicationInfo.packageName
            )
            appBeanList.add(bean!!)
        }

<uses-permission
        android:name="android.permission.QUERY_ALL_PACKAGES"
        tools:ignore="QueryAllPackagesPermission" />

    /**
     * 根据应用包名，查应用的icon图
     */
    private fun loadAppIconByPackageName(packageName:String,listener:(icon:Drawable) -> Unit){
        try {
            if (packageManager == null){
                packageManager = BaseApp.myApp.packageManager
            }
            val packageInfo = packageManager?.getPackageInfo(
                packageName,
                PackageManager.GET_ACTIVITIES
            )
            packageInfo?.applicationInfo?.loadIcon(packageManager)?.let { listener.invoke(it) }
        } catch (e: Exception) {
            listener.invoke(BaseApp.myApp.resources.getDrawable(R.mipmap.ic_launcher))
        }
    }

/**
  * 通过包名获取app的入口activity
  */
 @SuppressLint("WrongConstant")
 fun getAppEnter(context: Context, packageName: String): String {
     var mainAct = ""
     try {
         val intent = Intent().apply {
             action = Intent.ACTION_MAIN
             addCategory(Intent.CATEGORY_LAUNCHER)
         }
         val list =
             context.packageManager.queryIntentActivities(intent, PackageManager.GET_ACTIVITIES)
         list.forEach {
             if (TextUtils.equals(it.activityInfo.packageName, packageName)) {
                 mainAct = it.activityInfo.name
             }
         }
     } catch (ex: Exception) {
     } finally {
         return mainAct
     }
 }