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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
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对于一个项目，应该开发一个与 ESP8266（项目）通信的 Android 应用程序。为了轻松开发应用程序，选择了 MIT App Inventor 2。
项目中可用的 ESP8266 设备的 IP 地址不应固定。应用程序本身应该确定哪些设备当前处于活动状态以及可...
“/usr/bin/ld: cannot find -lz”
I am trying to compile Android source code under Ubuntu 10.04. I get an error saying,
11 Answers
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HashMap and int as key
...ust a quick little note, it is better to use ArrayMap or SimpleArrayMap on Android to save memory and increase performance(More information)
– Noah Huppert
Jun 8 '15 at 21:06
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Why do I want to avoid non-default constructors in fragments?
... example: public static FragmentName newInstance(your variables){}. As the Android documentation recommend, do not make a constructor with parameters, because the default one (without parameters) will be called automatically after the restart of your fragment.
– nistv4n
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How to set background color of a View
...tton itself. This background is a StateListDrawable, which you can find in android-2.1/data/res/drawable/btn_default.xml in your Android SDK installation. That, in turn, refers to a bunch of nine-patch bitmap images, available in multiple densities. You would need to clone and modify all of that to ...
How to pick an image from gallery (SD Card) for my app?
This question was originally asked for Android 1.6.
10 Answers
10
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Strange out of memory issue while loading an image to a Bitmap object
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The Android Training class, "Displaying Bitmaps Efficiently", offers some great information for understanding and dealing with the exception java.lang.OutOfMemoryError: bitmap size exceeds VM budget when loading Bitmaps.
Read ...
Replacing a fragment with another fragment inside activity group
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Use the below code in android.support.v4
FragmentTransaction ft1 = getFragmentManager().beginTransaction();
WebViewFragment w1 = new WebViewFragment();
w1.init(linkData.getLink());
ft1.addToBackStack(linkData.getName());
ft1.replace(R.id.listFrag...
Determine if the device is a smartphone or tablet? [duplicate]
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This subject is discussed in the Android Training:
Use the Smallest-width Qualifier
If you read the entire topic, they explain how to set a boolean value in a specific value file (as res/values-sw600dp/attrs.xml):
<resources>
<bool name="isTa...
How to check if an app is installed from a web-page on an iPhone?
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There are new ways of implementing this now in both Android and iOS. Take a look at Android App Links and iOS Universal Links
– maledr53
Dec 15 '17 at 18:38
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