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1.隱式意圖
怎么傳值我就不細說了,說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.(沒有應用處理意圖,應用就會掛掉。)
因為你不能保證每個手機上都有你需要的應用!
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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