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    <p>See this topic about dumpsys utility maybe run programmatically and read IO output buffer. I found few C++ sources you to look for. Running dumpsys may need root privileges.</p> <p><a href="https://stackoverflow.com/questions/11201659/android-adb-shell-dumpsys-tool">What&#39;s the Android ADB shell &quot;dumpsys&quot; tool and what are its benefits?</a></p> <p><a href="http://source.android.com/tech/input/dumpsys.html" rel="nofollow noreferrer">http://source.android.com/tech/input/dumpsys.html</a></p> <p><a href="http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/java/com/android/server/BatteryService.java" rel="nofollow noreferrer">http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/java/com/android/server/BatteryService.java</a></p> <p><a href="http://code.metager.de/source/xref/android/4.1.1/frameworks/native/cmds/dumpsys/dumpsys.cpp" rel="nofollow noreferrer">http://code.metager.de/source/xref/android/4.1.1/frameworks/native/cmds/dumpsys/dumpsys.cpp</a></p> <p><a href="http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/jni/com_android_server_BatteryService.cpp" rel="nofollow noreferrer">http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/jni/com_android_server_BatteryService.cpp</a></p> <p><a href="http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/jni/onload.cpp" rel="nofollow noreferrer">http://code.metager.de/source/xref/android/4.1.1/frameworks/base/services/jni/onload.cpp</a></p> <p>C++ sources, if Im right, reads /sys/class/power_supply virtual directory but what then happens someone may tell you more about the inner details of Linux system. Most of the code seems to be JNI interface stuff, updating private member fields in BatteryService.java class. OnLoad class registers jni&lt;->java hooks but thats not what you need to know, just for reference here.</p>
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    1. COi already thought about to read the level with dumpsys but as you already said, it needs root... but at last it worked for me, so thank you!
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Guidance
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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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