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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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