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Thinking in Google Doc-不同的Apps之間的交互

發(fā)布時(shí)間:2020-07-16 18:08:08 來(lái)源:網(wǎng)絡(luò) 閱讀:268 作者:屠夫章哥 欄目:移動(dòng)開發(fā)

1.隱式意圖

   怎么傳值我就不細(xì)說(shuō)了,說(shuō)些一般人不知道的吧。

   1)Verify There is an App to Receive the Intent(判斷是否有App響應(yīng)了意圖)

    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.(沒(méi)有應(yīng)用處理意圖,應(yīng)用就會(huì)掛掉。)

     因?yàn)槟悴荒鼙WC每個(gè)手機(jī)上都有你需要的應(yīng)用!

PackageManager packageManager = getPackageManager();
List activities = packageManager.queryIntentActivities(intent,
       
PackageManager.MATCH_DEFAULT_ONLY);
boolean isIntentSafe = activities.size() > 0;

    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)  

 

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