如果安装或重新定向到谷歌播放启动应用程序 [英] Launching an application if installed or redirect to Google Play

问题描述

到现在为止，我用这个code。如果安装到启动第三方应用程序或重定向到谷歌Play下载，如果尚未安装：

Until now I was using this code to launch a 3rd party application if installed or redirect to Google Play to download it if not installed already:

Intent intent = Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.address");
if (intent != null)
{
/* we found the activity now start the activity */
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
else
{
/* bring user to the market or let them choose an app? */
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id="+"com.package.address"));
startActivity(intent);
}

在这里读书，我发现启动，而不是特定活动（这是我想要的结果）的方式：

Reading here I found the way to launch a particular activity instead (that was my desired result):

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(new  ComponentName("com.package.address","com.package.address.xxxxxActivity"));
startActivity(intent);

它的工作开展特定活动，但我非常非常非常有限的知识，我不知道如何修改条件以启动链接到谷歌播放，如果没有安装的应用程序。

It works launching the particular activity, but with my very very very limited knowledge I don't know how to modify the condition to launch the link to Google Play if the app isn't installed.

希望有人能帮助我^^
谢谢！

Hope someone can help me^^ Thanks!

推荐答案

您可以使用一个尝试捕捉，看看包名存在

you can use a try catch to see if the package name exists

try {
    PackageManager pm=getPackageManager();
    PackageInfo info=pm.getPackageInfo("com.package.address",PackageManager.GET_META_DATA);
} catch (NameNotFoundException e) {
    //launch play store
}

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