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    <p>More often than not, "undefined reference" means that your build is misconfigured. For example, an unintended line break in the <code>Android.mk</code> file could cause the <strong>make</strong> tool choose a wrong link command for your project.</p> <p>Usually the error message includes the name of the missing function or global variable, and the module (file) which was looking for this reference. If the name is not self-explanatory, you can often find this name called in your source code, and then track it back to one of the external libraries you use, because it is likely to be <strong>declared</strong> in some header (<strong>.h</strong> or <strong>.hpp</strong>) files included in your source.</p> <p>It is not likely that you unintentionally use some external library which you have to download, because usually such mistakes manifest themselves earlier, when the compiler cannot find the necessary include (header) files.</p> <p>One particular case for Android native projects to display "undefined reference" errors is when the project uses non-official Android APIs, e.g. OpenMax/stagefreight. In such cases, the header files are found in the Android source tree, but compiled libraries needed for the link phase are not there. The usual workaround is to pull the binaries from your development device, e.g. </p> <pre><code>adb pull /system/lib/libstagefreight.so . </code></pre> <p>Anyways, it often helps to run <code>ndk-build</code> with <strong>V=1</strong> to see exactly what build commands are executed.</p>
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    1. COhi,Alex, after reading your post, still i cannot find clue to deal with my problem, so I post some of my codes, hope you can give me some more detailed solutions. Lots of thanks.
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    2. COWell, file `Animation2D_new.h` is used to **declare** the `Fap2Avi2D()` function, but does not [**define**](http://www.cprogramming.com/declare_vs_define.html) it. You probably have the corresponding `Animation2D_new.cpp` file somewhere; you should explicitly add it to `LOCAL_SRC_FILES`
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    3. COThank Alex again, the problem is solved.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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