Android Hacks Reading notes

Hack 1. Use Weightsum and Layout_weight.

Question: Try to make a button with a width that is half the effect of the parent view.

Key words: WeightSum = 1, layout_weight=0.5

Hack 2. Common Include and viewstub

Question: How to reduce the drawing time of complex interface.

Keywords: include multiplexing, externally defined layout_width,layout_height;viewstub placeholder, visible settings

Hack 3. Custom ViewGroup

Question: How to calculate the location and size of a child view using a custom ViewGroup

Keywords: custom view,attrs use

Hack 4. Using preference

Android provides classes such as preferenceactivity and preferencefragment to simplify the implementation of preference, so that simple preference can be implemented using them, You can also implement more flexible configurations by inheriting some preference subordinate classes, such as Dialogpreference.

Keywords: Preference, custom Preference

Hack 5. Using Textswitcher/imageswitcher

Question: How do I quickly add animations to multiple text transitions? (similarly image toggle)

Key words: Switcher

Hack 6. Add a uniform sequential animation effect for sub-view ViewGroup subordinates

Question: Animate a child view of a viewgroup with multiple (similar) sub-view

Key words: Layoutanimationcontroller,listview etc

Hack 7.canvas Drawing

Another important part of customizing view, using canvas to draw graphics or images on the screen, custom actions, etc.

Keywords: Canvas

Hack 8. Create Ken Burns effect

Question: How to create an effect like slide transitions

Key words: Animatorset,objectanimator

Hack 9. Use no edittext to enter the data to be tested

Issue: To verify that a user input time format is more troublesome, with the button to detect input lines do not?

Keywords: Customizing background for controls

Hack 10. Formatting the TextView text display

Question: How to implement a simple HTML syntax under TextView, or add a foreground or background color to some text

Key words: Spannablestring,backgroundcolorspan,foregroundcolorspan

Hack 11. Making Luminous Text

Questions raised:

　　

Key words: Typeface,assets/fonts,xml (Shadowcolor,shadowradius,shadowdx,shadowdy)

Example:

　　

 Public class extends TextView {    public  Ledtextview (context context, AttributeSet attrs) {        super  (context, attrs);         = context.getassets ();         Final Typeface font = Typeface.createfromasset (assets, "Fonts/digital-7.ttf");        Settypeface (font);}    }

Hack 12. Rounded Corners Background

Using drawable can not only use PNG images (especially now Ic_launcher is mipmaps), but also use XML to customize some graphics and status display, such as Press,select

Key words: drawable,xml (Shape corners), shapedrawables

Hack 13. Get the width and height of the view in OnCreate

Problem: The layout method will not be called until the OnCreate call is completed, so the width and height of the view cannot be obtained in OnCreate

keywords, view.post,runable,getwidth,getheight

Hack 16. Setting the Toast location

Keywords: delay show, set gravity

hack.18. Removing the log code with Proguard

Keywords: Androidstudio built-in use of Proguard

Hack 20. Using Model-view-presenter mode

Key words: MVP

Use of Hack 21.SyncAdapter

Key words: Service,provider,syncadapter

Hack 27. Sync settings on activity and adapter via delegate

Keywords: third party Delegate,adapter,view

Hack 41. Ormlite Database

Key words: ORM database in complex case instead of SQLite

Hack 43 Binding A series of database operations

Keywords: applybatch, accelerating large-scale frequent database operations

Android Hacks Reading notes