使用这个，对我的作品：

 公共静态布尔isMailCli​​ent present（上下文的背景下）{
    意向意图=新意图（Intent.ACTION_SEND）;
    intent.setType（text / html的）;
    最终的软件包管理系统软件包管理系统= context.getPackageManager（）;
    清单＆LT; ResolveInfo＆GT;清单= packageManager.queryIntentActivities（意向，0）;    如果（则为list.size（）== 0）
        返回false;
    其他
        返回true;
}
 

I need to check whether email client is installed on a device or not. I have used the following code but it does not work for me.

public boolean isIntentAvailable() {
    final PackageManager packageManager = getApplicationContext().getPackageManager();
    final Intent intent = new Intent(Intent.ACTION_SEND);
    intent.putExtra(Intent.EXTRA_EMAIL, "vin@gmail.com");
    List<ResolveInfo> list = packageManager.queryIntentActivities(intent, PackageManager.GET_META_DATA);
    return list.size() > 0;
} 

Use this, works for me :

public static boolean isMailClientPresent(Context context){
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("text/html");
    final PackageManager packageManager = context.getPackageManager();
    List<ResolveInfo> list = packageManager.queryIntentActivities(intent, 0);

    if(list.size() == 0)
        return false;
    else 
        return true;
}