title: Android battery usage
body: <p>My goal is to decide whether my application has a battery issue or not so I want to add a module that checking the percentage of my app battery usage each interval time.</p>
  
  <p><strong>How can I retrieve the values of the battery usage for each application (or at least my application) by percentage?</strong>
  I saw several answers in stack overflow saying that there is no way...</p>
  
  <p>Can I do something? even reflection is good for me.</p>
  
  <p>Besides, is there any <strong>good</strong> dev tool that could help me investigate my app battery consumption? (by components, i.e. wifi, gps, gsm etc.)</p>
  
  <p>thanks</p>