title: android how to send a system broadcast
body: <p>I am working with testing android app's power consumption
  and to make the app consump most power as possible,I want to send a system broadcast like "android.intent.action.PACKAGE_ADD",but the system reboot when I send it by adb shell am broadcast command.</p>
  
  <p>So is there any method to send a system broadcast?</p>