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Android调用相机无法执行onActivityResult或data为null.html
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Android调用相机无法执行onActivityResult或data为null.html
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<meta name="description" content="最近项目中调用系统相机时遇到了这么个问题：红米手机无法执行onActivityResult回调，部分华为手机无法获取到照片数据，最后各种分析，各种网上搜索资料折腾了好久，最后终于把问题解决，当看到问题的最终原因时，我也是醉了，简直就是坑爹坑大发了。
最开始用红米手机调用系统相机的时，当我拍照完成点击那个勾勾始终无法返回到前面的界面上，也就是无法调用onActivityResult函数取到拍照的照片">
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<meta property="og:description" content="最近项目中调用系统相机时遇到了这么个问题：红米手机无法执行onActivityResult回调，部分华为手机无法获取到照片数据，最后各种分析，各种网上搜索资料折腾了好久，最后终于把问题解决，当看到问题的最终原因时，我也是醉了，简直就是坑爹坑大发了。
最开始用红米手机调用系统相机的时，当我拍照完成点击那个勾勾始终无法返回到前面的界面上，也就是无法调用onActivityResult函数取到拍照的照片">
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<meta name="twitter:description" content="最近项目中调用系统相机时遇到了这么个问题：红米手机无法执行onActivityResult回调，部分华为手机无法获取到照片数据，最后各种分析，各种网上搜索资料折腾了好久，最后终于把问题解决，当看到问题的最终原因时，我也是醉了，简直就是坑爹坑大发了。
最开始用红米手机调用系统相机的时，当我拍照完成点击那个勾勾始终无法返回到前面的界面上，也就是无法调用onActivityResult函数取到拍照的照片">
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Android调用相机无法执行onActivityResult或data为null
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<p>最近项目中调用系统相机时遇到了这么个问题：红米手机无法执行onActivityResult回调，部分华为手机无法获取到照片数据，最后各种分析，各种网上搜索资料折腾了好久，最后终于把问题解决，当看到问题的最终原因时，我也是醉了，简直就是坑爹坑大发了。</p>
<p>最开始用红米手机调用系统相机的时，当我拍照完成点击那个勾勾始终无法返回到前面的界面上，也就是无法调用onActivityResult函数取到拍照的照片，在网上搜索了一圈，没找到解决办法，都说是红米的系统问题，无法解决，项目比较紧张，刚好客户的手机全部是统一型号的华为荣耀6Plus，这个问题丢着暂时没管了。<br>后来现场同事批量测试机器时，发现有3台手机可以拍照，但是在onActivityResult回调中获取到的照片数据为null，但是其他的同型号手机又没这个问题，这问题看着真是坑爹啊。</p>
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<p>远程调试代码后发现，我在调用系统相机时设置的照片存放目录无法创建成功，我调用系统相机的代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">takePicture</span><span class="params">()</span> </span>{</div><div class="line"> <span class="comment">//照片存放目录</span></div><div class="line"> File file = <span class="keyword">new</span> File(mPicDirectory);</div><div class="line"> <span class="keyword">if</span>(!file.exists()) {<span class="comment">//目录不存在则创建该目录及其不存在的父目录</span></div><div class="line"> file.mkdirs();</div><div class="line"> }</div><div class="line"> Intent intent = <span class="keyword">new</span> Intent(MediaStore.ACTION_IMAGE_CAPTURE);</div><div class="line"> mPicName = getPictureName();<span class="comment">//获取照片名称</span></div><div class="line"> mPicPath = mPicDirectory + mPicName;<span class="comment">//照片存储路径</span></div><div class="line"> <span class="comment">//将照片保存到mPicPath位置</span></div><div class="line"> intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(<span class="keyword">new</span> File(mPicPath)));</div><div class="line"> startActivityForResult(intent, CODE_RESULT_TAKE_PHOTO);</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>我调试的时候在onActivityResult回调里通过照片路径获取Bitmap对象的时候发现获取到的Bitmap对象一直为null，所以就猜想是不是照片没保存成功，我在文件管理系统里去找这个照片的时候发现，连照片存储目录mPicDirectory都不存在，我再次跟踪代码发现file.mkdirs()始终返回的都是false。看来问题的最终原因是这个：无法创建目录和文件(华为手机系统在拍照输出的时候，如果输出文件路径不存在时竟然没有任何提示和异常，这点对于发现问题的根源有点困难)。然后我又去检查了权限、手机设置里面的权限等所有有可能涉及的问题，结果依然没有效果。既然这些都不是导致目录创建失败的原因，那会不会是目录路径本身不正确呢，我的目录路径是这样获取的：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div></pre></td><td class="code"><pre><div class="line">String mPicDirectory = FileManager.getPath() + Configuration.SYS_PHOTO_PATH;</div><div class="line"> </div><div class="line"><span class="comment">//FileManager的部分代码是这样的，这个代码是以前的同事写的，没有细看过：</span></div><div class="line"> </div><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">getPath</span><span class="params">()</span></span>{</div><div class="line"> </div><div class="line"><span class="keyword">boolean</span> sdCardExist = Environment.getExternalStorageState()</div><div class="line"> .equals(android.os.Environment.MEDIA_MOUNTED); <span class="comment">//判断sd卡是否存在 </span></div><div class="line"><span class="keyword">return</span> !sdCardExist ? MOBILE_PATH : SD_PATH;</div><div class="line">}</div><div class="line"> </div><div class="line"><span class="comment">//sdcard路径</span></div><div class="line"><span class="keyword">private</span> <span class="keyword">static</span> String SD_PATH = Environment.getExternalStorageDirectory().getAbsolutePath();</div><div class="line"> </div><div class="line"><span class="comment">//应用数据路径</span></div><div class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> String MOBILE_PATH = Environment.getDataDirectory().getAbsolutePath();</div><div class="line"> </div><div class="line"><span class="comment">//这里有一段静态代码块</span></div><div class="line"><span class="keyword">static</span>{</div><div class="line"> File f = <span class="keyword">new</span> File(<span class="string">"/storage/sdcard1"</span>);</div><div class="line"> <span class="keyword">if</span>(f.exists()){</div><div class="line"> <span class="keyword">long</span> size = getFreeSize(<span class="string">"/storage/sdcard1"</span>);</div><div class="line"> <span class="keyword">long</span> sd0Size = getFreeSize(<span class="string">"/storage/sdcard0"</span>);</div><div class="line"> <span class="keyword">if</span>(size > sd0Size){</div><div class="line"> SD_PATH = <span class="string">"/storage/sdcard1"</span>;</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>当我看到上面的静态代码块的时候，我立马就知道了问题的原因，静态代码块中做了一个剩余空间判断，选取的是空间比较大的那个sdcard路径，而且代码都是写死的<br><code>Environment.getExternalStorageDirectory().getAbsolutePath()</code>系统这个代码是获取手机里的内置SDCard的路径，我的红米手机自己又额外插了一张内存卡，这个是手机的外接SDCard，用<code>Environment.getExternalStorageDirectory()</code>获取到只是手机自带的外置SDCard路径，不能获取自己插入的内存卡路径，我的手机通过<code>Environment.getExternalStorageDirectory()</code>方式获取的路径是<code>/storage/sdcard0</code>（我手机内置的SDCard），而通过可用空间比较之后发现该卡的可用空间少于<code>/storage/sdcard1</code>（我自己插入的SDCard），所以最终路径变成了<code>/storage/sdcard1</code>，而在Android4.4以上后，不允许三方App对外接的SDCard进行操作，因此我们队最后得到的这个目录是没有写入权限的，所以我创建照片存储目录的时候一直失败，所以拍照的时候照片数据没有地方可以输出，华为手机是直接体现在照片数据无法获取，而红米手机则是直接不允许返回到前面的调用界面。</p>
<p>Google在Android中限制三方App操作外接SDCard的原文如下：</p>
<blockquote>
<p>The WRITE_EXTERNAL_STORAGE permission must only grant write access to the primary external storage on a device. Apps must not be allowed to write to secondary external storage devices, except in their package-specific directories as allowed by synthesized permissions.</p>
</blockquote>
<p>后来想了想，调用相机这么简单的一个功能，红米的系统应该不可能给阉割掉，所以出了问题还是老老实实的先找自己代码的问题吧。至于那个外接SDCard的写入权限还有待寻找答案。</p>
<p>系统内置SDCard写入、删除、读写权限：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">//文件创建、删除权限</div><div class="line"><span class="tag"><<span class="name">uses-permission</span> <span class="attr">android:name</span>=<span class="string">"android.permission.MOUNT_UNMOUNT_FILESYSTEMS"</span> /></span></div><div class="line">//文件读写权限，只针对于手机内存的SDCard，对外接SDCard无效</div><div class="line"><span class="tag"><<span class="name">uses-permission</span> <span class="attr">android:name</span>=<span class="string">"android.permission.WRITE_EXTERNAL_STORAGE"</span> /></span></div></pre></td></tr></table></figure>
<hr>
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