android 如何打开QQ,微信应用

一、问题
如何打开QQ、微信应用
二、实现
1.首先检查是不是有安装对应的应用

fun checkApkExist(packageName: String?): Boolean {
    return if (packageName == null || "" == packageName) false else try {
        val info: ApplicationInfo = getPackageManager().getApplicationInfo(
            packageName,
            PackageManager.GET_UNINSTALLED_PACKAGES
        )
        true
    } catch (e: PackageManager.NameNotFoundException) {
        false
    }
}

2.跳转

fun goApp(appName: String){
    if (appName == "WeChat"){
        val intent = Intent(Intent.ACTION_MAIN)
        val cmp = ComponentName("com.tencent.mm","com.tencent.mm.ui.LauncherUI")
        intent.component = cmp
        intent.addCategory(Intent.CATEGORY_LAUNCHER)
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
        startActivity(intent)
    }else{
        if (checkApkExist("com.tencent.mobileqq")){
            val intent = Intent(Intent.ACTION_MAIN)
            val cmp = ComponentName("com.tencent.mobileqq","com.tencent.mobileqq.activity.SplashActivity")
            intent.component = cmp
            intent.addCategory(Intent.CATEGORY_LAUNCHER)
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
            startActivity(intent)
        }else{
            toast(getString(R.string.sorry_no_install_mobile_qq))
        }
    }
}