Thinking in Google Doc-不同的Apps之间的交互

1.隐式意图

   怎么传值我就不细说了，说些一般人不知道的吧。

   1）Verify There is an App to Receive the Intent（判断是否有App响应了意图）

    you should always include a verification step before invoking an intent.

    Caution: If you invoke an intent and there is no app available on the device that     can handle the intent, your app will crash.（没有应用处理意图，应用就会挂掉。）

     因为你不能保证每个手机上都有你需要的应用! 

PackageManager packageManager = getPackageManager();
List activities = packageManager.queryIntentActivities(intent,

        PackageManager.MATCH_DEFAULT_ONLY);
boolean isIntentSafe = activities.size() > 0;

        

          
        
        
        

          

          AI 代码解读
        
      
      

    If isIntentSafe is true, then at least one app will respond to the intent. If it is

   false, then there aren't any apps to handle the intent.

   2）  

      本文转自屠夫章哥  51CTO博客，原文链接：http://blog.51cto.com/4259297/1715709，如需转载请自行联系原作者