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从网购到火车票，对比淘宝12306网为何如此烂？ - 大数据 & AI - 清泛网 - ...
...淘宝货品与消费者的供需关系可能是10：1，技术革新解决不了某种商品严重供不应求的本质问题。淘宝上的商品天然没有全局一致性的问题，做技术上做分区优化就简单得多了。火车票买卖的每笔业务都要互斥，以检查有没有票...
Android selector & text color
...oding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:color="#000000" /> <!-- pressed -->
<item android:state_focused="true"
android:color="#000000" /> <!-- focus...
Using build types in Gradle to run same app that uses ContentProvider on one device
..."?>
<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="@string/account_type"
android:icon="@drawable/ic_launcher"
android:smallIcon="@drawable/ic_launcher"
...
Animate the transition between fragments
...fade_in.xml:
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:interpolator/accelerate_quad"
android:valueFrom="0"
android:valueTo="1"
android:propertyName="alpha"
android:duration="@android:integer/config_mediumAnimTime...
Declaring a custom android UI element using XML
...l
Include the namespace declaration xmlns:app="http://schemas.android.com/apk/res-auto" in the top level xml element. Namespaces provide a method to avoid the conflicts that sometimes occur when different schemas use the same element names (see this article for more info). The URL is simply a manne...
How can I create a keystore?
... follow these steps:
1- On the menu bar, click Build > Generate Signed APK.
2-On the Generate Signed APK Wizard window, click Create new to create a new keystore.
If you already have a keystore, go to step 4.
3- On the New Key Store window, provide the required information as shown in figu...
Mipmap drawables for icons
...tinct uses of mipmaps:
For launcher icons when building density specific APKs. Some developers build separate APKs for every density, to keep the APK size down. However some launchers (shipped with some devices, or available on the Play Store) use larger icon sizes than the standard 48dp. Launcher...
How to implement a ViewPager with different Fragments / Layouts
...id.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
The Fragment classes, FirstFr...
Can I change the Android startActivity() transition animation?
... this code:
fadein.xml
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<alpha android:fromAlpha="1.0"
android:toAlpha="0.0"
android:duration="500"/> //Time in milliseconds
</set>
In your finish-class
...
ListView item background via custom selector
...tf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:background="@drawable/listitem_background"
>
...
</LinearLayout>
listitem_ba...