blocks|key|2774008|text|它已经是双缓冲的，这就是unlockCanvasAndPost()调用所做的。没有必要创建位图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2774009|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It's already double buffered, that's what the unlockCanvasAndPost() call does. There is no need to create a bitmap.

blocks|key|1577688|text|Android开发者组中的步骤说，您需要一个缓冲区-画布，所有呈现都被绘制到该缓冲区。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1577689|Bitmap+buffCanvasBitmap;
Canvas+buffCanvas;

//+Creating+bitmap+with+attaching+it+to+the+buffer-canvas,+it+means+that+all+the+changes+//+done+with+the+canvas+are+captured+into+the+attached+bitmap
tempCanvasBitmap+=+Bitmap.createBitmap(getWidth(),+getHeight(),+Bitmap.Config.ARGB_8888);
tempCanvas+=+new+Canvas();
tempCanvas.setBitmap(tempCanvasBitmap);

//+and+then+you+lock+main+canvas
canvas+=+getHolder().lockCanvas();++++++++++++++
//+draw+everything+you+need+into+the+buffer
tempCanvas.drawRect....+//+and+etc
//+then+you+draw+the+attached+bitmap+into+the+main+canvas
canvas.drawBitmap(tempCanvasBitmap,+0,+0,+drawView.getPaint());
//+then+unlocking+canvas+to+let+it+be+drawn+with+main+mechanisms
getHolder().unlockCanvasAndPost(canvas);|code-block|syntax|javascript|1577690|您正在获得主缓冲区，您正在画进入，而没有得到不同的双缓冲画布‘在每个持有人的锁。|1577691|entityMap|0|LINK|mutability|MUTABLE|url|https://groups.google.com/d/msg/android-developers/1QN1qX_Qey4/Vnz5H49RjtoJ^0|0|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

The steps from <a href="https://groups.google.com/d/msg/android-developers/1QN1qX_Qey4/Vnz5H49RjtoJ" rel="nofollow">Android Developers Group</a> say that you need a buffer-canvas, to which all the renders are drawn onto. 

<pre><code>Bitmap buffCanvasBitmap;
Canvas buffCanvas;

// Creating bitmap with attaching it to the buffer-canvas, it means that all the changes // done with the canvas are captured into the attached bitmap
tempCanvasBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
tempCanvas = new Canvas();
tempCanvas.setBitmap(tempCanvasBitmap);

// and then you lock main canvas
canvas = getHolder().lockCanvas(); 
// draw everything you need into the buffer
tempCanvas.drawRect.... // and etc
// then you draw the attached bitmap into the main canvas
canvas.drawBitmap(tempCanvasBitmap, 0, 0, drawView.getPaint());
// then unlocking canvas to let it be drawn with main mechanisms
getHolder().unlockCanvasAndPost(canvas);
</code></pre>

You are getting the main buffer, which you are drawing into without getting different double-buffer canvas' on each holder's lock.

How does one go about doing this? Could somebody give me an outline?

From what I've found online, it seems like in my run() function:

<ol>
<li>create a bitmap</li>
<li>create a canvas and attach it to the bitmap</li>
<li>lockCanvas()</li>
<li>call draw(canvas) and draw bitmap into back buffer (how??)</li>
<li>unlockCanvasAndPost()</li>
</ol>

Is this correct? If so, could I get a bit of an explanation; what do these steps mean and how do I implement them? I've never programmed for Android before so I'm a real noob. And if it isn't correct, how DO I do this?

Double buffering in Java on Android with canvas and surfaceview

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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怎样才能做到这一点？谁能给我一个提纲吗？根据我在网上的发现，在我的run()函数中似乎是这样的：创建位图创建一个画布并将其附加到位图上。lockCanvas()调用绘制(画布)并将位图绘制到后缓冲区(如何？)unlockCanvasAndPost()这是正确的吗？如果是这样的话，我能得到一点解释吗?这些步骤意味着什么?...

问基于canvas和surfaceview的Java双缓冲技术
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