Android receives power from the mobile phone

In android, you can use intent broadcast to monitor the power of your mobile phone.
The following is an example of action_battery_changed:

Java code
Package com. liao;
Import android. app. Activity;
Import android. content. BroadcastReceiver;
Import android. content. Context;
Import android. content. Intent;
Import android. content. IntentFilter;
Import android. OS. Bundle;
Import android. widget. TextView;
 
Public class BatteryLevelActivity extends Activity {
/** Called when the activity is first created .*/
Private TextView batterLevel;
 
@ Override
/**
* Called when the current activity is first created.
*/
Public void onCreate (Bundle icicle ){
Super. onCreate (icicle );
SetContentView (R. layout. main );
BatterLevel = (TextView) this. findViewById (R. id. batteryLevel );
BatteryLevel ();
}
 
Private void batteryLevel (){
BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver (){
Public void onReceive (Context context, Intent intent ){
Context. unregisterReceiver (this );
Int rawlevel = intent. getIntExtra ("level",-1); // obtain the current power
Int scale = intent. getIntExtra ("scale",-1 );
// Obtain the total power
Int level =-1;
If (rawlevel> = 0 & scale> 0 ){
Level = (rawlevel * 100)/scale;
}
BatterLevel. setText ("Battery Level Remaining:" + level + "% ");
}
};
IntentFilter batteryLevelFilter = new IntentFilter (Intent. ACTION_BATTERY_CHANGED );
RegisterReceiver (batteryLevelReceiver, batteryLevelFilter );
}

}

If it is 2. The SDK after 0 can also be like this:
Public void onReceive (Context context, Intent intent ){

Context. unregisterReceiver (this );

Int rawlevel = intent. getIntExtra (BatteryManager. EXTRA_LEVEL,-1 );

Int scale = intent. getIntExtra (BatteryManager. EXTRA_SCALE,-1 );

Just modify the class.