blocks|key|2730063|text|我设法在我的Galaxy+S4上锁定了曝光补偿|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2730064|Camera.Parameters+parameters+=+mCamera.getParameters();
parameters.setAutoExposureLock(true);
mCamera.setParameters(parameters);
mCamera.startPreview();|code-block|syntax|javascript|2730065|然后，在每个takePicture回调中，我基本上将锁重置为true|offset|length|style|CODE|2730066|Camera.Parameters+parameters+=+mCamera.getParameters();
parameters.setAutoExposureLock(true);
mCamera.setParameters(parameters);|2730067|这会设法做一些事情。所有捕捉到的图像几乎都一样明亮。更改exposureCompensation没有任何影响，但当更改ISO时，曝光时间会自动调整。|2730068|我会更深入地挖掘这一点，并相应地更新这篇文章。|2730069|entityMap^0|0|0|6|B|0|0|S|K|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

I managed to lock exposure compensation on my Galaxy S4

<pre><code>Camera.Parameters parameters = mCamera.getParameters();
parameters.setAutoExposureLock(true);
mCamera.setParameters(parameters);
mCamera.startPreview();
</code></pre>

Then in each <code>takePicture</code> callback I basically reset the lock to true

<pre><code>Camera.Parameters parameters = mCamera.getParameters();
parameters.setAutoExposureLock(true);
mCamera.setParameters(parameters);
</code></pre>

This manages to do something. All images captured are almost equally bright. Changing <code>exposureCompensation</code> has no effect, but when changing ISO the exposure time is automagically adjusted.

I'll dig some more into this and update this post accordingly.

blocks|key|414668|text|我也有同样的问题。这是因为camera.takePicture(shutterCallback,+rawCallback,+jpegCallback)会停止预览；您必须调用camera.startPreview();才能继续预览。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|414669|entityMap^0|D|1Q|2E|M|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I have the same problem. That's because <code>camera.takePicture(shutterCallback, rawCallback, jpegCallback)</code> stops the preview; you must call <code>camera.startPreview();</code> to continue previewing.

blocks|key|2730050|text|我自己也遇到过这个问题，我假设这是一个API错误，因为它对我和对你都是一样的。除非你在此期间设法修复了它？让我知道！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2730051|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|$]]

I've come accross this myself, I'm assuming its an API error as it works the same for me as for you. Unless you have managed to fix it in the meantime? Let me know!

blocks|key|4195793|text|在我的三星Galaxy+Note3上，在takePicture回调中将锁定重置为true效果不佳。它让情况好了一点，但仍然产生了亮度差别很大的图像。Exif在这些jepgs中确认exposure+time在1/120秒到1/400秒之间变化。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4195794|我还注意到一些jpegs有相似的exposure+time+(1/120秒)，但在exif中保存的brightness值不同。因此，我猜测图像后处理器是游戏规则的制定者。|4195795|我已经通过native_getParameters丢弃了所有相机参数，找到了图像校正参数，并将它们都设置为5。这些参数是：|4195796|set("min-brightness",+5);
set("max-brightness",+5);

set("contrast",+5);
set("min-contrast",+5);
set("max-contrast",+5);

set("max-saturation",+5);
set("min-saturation",+5);
set("saturation",+5);|code-block|syntax|javascript|4195797|现在输出好多了。图像几乎同样明亮。所有500张测试图像的exposure+time+=+1/120±1(很少是1/125)，brightness+=5±0.1。|4195798|entityMap^0|K|B|2H|D|0|G|D|1D|A|0|5|K|1H|1|0|0|S|D|1Q|A|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|R|$]]

Resetting the lock to true in <code>takePicture</code> callback doesn't work well on my Samsung Galaxy Note 3. It makes situation a bit better, but still produces images with quite different brightness. Exif inside those jepgs confirm that <code>exposure time</code> varies from 1/120 sec to 1/400 sec.

I also noticed that some jpegs have similar <code>exposure time</code> (1/120 sec) but different <code>brightness</code> value saved in exif. So, my was guess that the image post-processor is the game breaker.

I've dumped all camera parameters via <code>native_getParameters</code>, found image correction parameters and set them all to <code>5</code>. Those parameters are:

<pre><code>set("min-brightness", 5);
set("max-brightness", 5);

set("contrast", 5);
set("min-contrast", 5);
set("max-contrast", 5);

set("max-saturation", 5);
set("min-saturation", 5);
set("saturation", 5);
</code></pre>

Now output is much better. Images almost equally bright. All of 500 test images have <code>exposure time</code> = 1/120 ± 1 (rarely 1/125) and <code>brightness</code> = 5 ± 0.1.

blocks|key|2730090|text|我在S3上也遇到了同样的问题。我把这些行放在回调函数的开头：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2730091|public+void+onPictureTaken(byte[]+data,+Camera+camera)+{
++++//Relock+the+camera+for+S3+device
++++camera.startPreview();
++++UnLockCamera(camera);
++++LockCamera(camera);
++++//+your+code|code-block|syntax|javascript|2730092|使用下面的两个函数|2730093|public+void+LockCamera(Camera+camera){
++++//stop+auto+white+balance+and+auto+exposure+lock
++++Camera.Parameters+params+=+camera.getParameters();
++++if+(params.isAutoExposureLockSupported())+{
++++++++params.setAutoExposureLock+(true);
++++}
++++if+(params.isAutoWhiteBalanceLockSupported())+{
++++++++params.setAutoWhiteBalanceLock(true);
++++}
++++camera.setParameters(params);
}
public+void+UnLockCamera(Camera+camera){
++++//stop+auto+white+balance+and+auto+exposure+lock
++++Camera.Parameters+params+=+camera.getParameters();
++++if+(params.isAutoExposureLockSupported())+{
++++++++params.setAutoExposureLock+(false);
++++}
++++if+(params.isAutoWhiteBalanceLockSupported())+{
++++++++params.setAutoWhiteBalanceLock(false);
++++}
++++camera.setParameters(params);
}|2730094|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I had the same issue on S3. I ended putting those line at the begining of the callback:

<pre><code>public void onPictureTaken(byte[] data, Camera camera) {
 //Relock the camera for S3 device
 camera.startPreview();
 UnLockCamera(camera);
 LockCamera(camera);
 // your code
</code></pre>

With the two functions below

<pre><code>public void LockCamera(Camera camera){
 //stop auto white balance and auto exposure lock
 Camera.Parameters params = camera.getParameters();
 if (params.isAutoExposureLockSupported()) {
 params.setAutoExposureLock (true);
 }
 if (params.isAutoWhiteBalanceLockSupported()) {
 params.setAutoWhiteBalanceLock(true);
 }
 camera.setParameters(params);
}
public void UnLockCamera(Camera camera){
 //stop auto white balance and auto exposure lock
 Camera.Parameters params = camera.getParameters();
 if (params.isAutoExposureLockSupported()) {
 params.setAutoExposureLock (false);
 }
 if (params.isAutoWhiteBalanceLockSupported()) {
 params.setAutoWhiteBalanceLock(false);
 }
 camera.setParameters(params);
}
</code></pre>

I'm having a problem with the exposure lock in the Android Camera.Parameters class. I'm able to lock the exposure before taking a picture, but upon calling <code>camera.takePicture(shutterCallback, rawCallback, jpegCallback)</code> the exposure starts auto-adjusting again.

Also, <code>getAutoExposureLock()</code> still returns <code>true</code> even though the preview and the final saved images show adjusted exposure.

The Android documentation says the exposure lock won't be changed by taking a picture: <a href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#setAutoExposureLock(boolean)" rel="noreferrer">http://developer.android.com/reference/android/hardware/Camera.Parameters.html#setAutoExposureLock(boolean)</a>

What am I missing?

AutoExposureLock resetting after calling takePicture()

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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我在Android Camera.Parameters类中遇到了一个曝光锁的问题。我可以在拍照前锁定曝光，但在调用camera.takePicture(shutterCallback, rawCallback, jpegCallback)时，曝光又开始自动调整。此外，即使预览和最终保存的图像显示调整后的曝光，getAutoExposureLock()仍会返回true。安卓文档说曝光锁不会通过拍照来

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