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Most people do not understand the knowledge points of this article "what are the patterns of Android Sdk?", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "what are the patterns of Android Sdk" article.

First, combination mode

View + ViewPager

Second, observer mode

AbstractCursor

Third, singleton mode

Input method (InputMethodManager) status bar, etc.

Fourth, template method model

Method onDraw () dispatchDraw () in View

Public class View {protected void onDraw (Canvas canvas) {} protected void dispatchDraw (Canvas canvas) {} / / algorithm skeleton public void draw (Canvas canvas) {if (! verticalEdges & &! horizontalEdges) {/ / step 1 if (! dirtyOpaque) onDraw (canvas); / / step 2 dispatchDraw (canvas); / / step 3 onDrawScrollBars (canvas); return;}} / /.

Fifth, memo mode

Canvas save () restore () method

Sixth, sharing meta-model

Sqlite requests sql, and the returned results of duplicate sql are cached.

The client obtains the shared meta object through the shared meta factory, and the creation of the shared meta object is controlled according to the factory's share meta pool. If there is no such object in the share meta pool, the object is created and saved to the share meta pool. If there is this object in the share meta pool, then use this object directly. Because the sharing meta-object is shared at the same time, it shows that it reuses the invariance of attributes, otherwise they are all changing things, there is no sharing, these immutable attributes are called internal state, independent from the external scene.

Seven, command mode

Encapsulates the recipient and operation

New Thread (new Runnable () {}) .start ()

Eighth, factory mode

ThreadFactory in Asynctask

Private static final ThreadFactory sThreadFactory = new ThreadFactory () {private final AtomicInteger mCount = new AtomicInteger (1); public Thread newThread (Runnable r) {return newThread (r, "AsyncTask #" + mCount.getAndIncrement ());}}

Nine, adapter mode

Adapter

Ten, prototype model

Cloneable interface

National Day holiday, strategic model

Temporarily understood as the connotation of polymorphism

Twelve, the builder model

Builder

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