Android에서 배터리 잔량 및 상태 확인

Android에서 배터리 잔량 및 상태 확인

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배터리 잔량 및 상태 (전원 연결, 방전, 충전 등)는 어떻게 확인할 수 있습니까? 개발자 문서를 조사한 결과 BatteryManager 클래스를 찾았습니다. 그러나 그것은 어떤 메서드도 포함하지 않고 상수 만 포함합니다. 어떻게 사용합니까?

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다음 은 배터리 정보를 얻는 방법을 설명하는 코드 샘플입니다.

요약하자면 인 ACTION_BATTERY_CHANGED텐트에 대한 브로드 캐스트 수신기 는 동적으로 설정됩니다. 매니페스트에 선언 된 구성 요소를 통해 수신 할 수없고 Context.registerReceiver().

public class Main extends Activity {
  private TextView batteryTxt;
  private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context ctxt, Intent intent) {
      int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
      batteryTxt.setText(String.valueOf(level) + "%");
    }
  };

  @Override
  public void onCreate(Bundle b) {
    super.onCreate(b);
    setContentView(R.layout.main);
    batteryTxt = (TextView) this.findViewById(R.id.batteryTxt);
    this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
  }
}

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API 21 이후로 다음을 사용하여 현재 배터리 수준을 백분율로 얻을 수 있습니다.

BatteryManager bm = (BatteryManager)getSystemService(BATTERY_SERVICE);
int batLevel = bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);

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공식 Android 문서를 기반으로 Helper 또는 Util 클래스에서이 메서드를 사용하여 현재 배터리 비율을 가져올 수 있습니다.

public static int getBatteryPercentage(Context context) {

    IntentFilter iFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = context.registerReceiver(null, iFilter);

    int level = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) : -1;
    int scale = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1) : -1;

    float batteryPct = level / (float) scale;

    return (int) (batteryPct * 100);
}

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You don't have to register an actual BroadcastReceiver as Android's BatteryManager is using a sticky Intent:

IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = registerReceiver(null, ifilter);

int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

float batteryPct = level / (float)scale;

return (int)(batteryPct*100);

This is from the official docs over at https://developer.android.com/training/monitoring-device-state/battery-monitoring.html.

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You can use this to get remaining charged in percentage.

private void batteryLevel() {
        BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
            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);
                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);
    }

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try this function no need permisson or any reciver

void getBattery_percentage()
{
      IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
      Intent batteryStatus = getApplicationContext().registerReceiver(null, ifilter);
      int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
      int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
      float batteryPct = level / (float)scale;
      float p = batteryPct * 100;

      Log.d("Battery percentage",String.valueOf(Math.round(p)));
  }

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private void batteryLevel() {
        BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                context.unregisterReceiver(this);
                int rawlevel = intent.getIntExtra("level", -1);
                int scale = intent.getIntExtra("scale", -1);
                int level = -1;
                if (rawlevel >= 0 && scale > 0) {
                    level = (rawlevel * 100) / scale;
                }
                mBtn.setText("Battery Level Remaining: " + level + "%");
            }
        };
        IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(batteryLevelReceiver, batteryLevelFilter);
    }

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To check battery percentage we use BatteryManager, the following method will return battery percentage.

Source Link

public static float getBatteryLevel(Context context, Intent intent) {
    Intent batteryStatus = context.registerReceiver(null,
            new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    int batteryLevel = -1;
    int batteryScale = 1;
    if (batteryStatus != null) {
        batteryLevel = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, batteryLevel);
        batteryScale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, batteryScale);
    }
    return batteryLevel / (float) batteryScale * 100;
}

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After some MORE researching, I found BatteryManager.EXTRA_LEVEL.

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one mistake in official docs, you must use double instead float. Because 0.53F * 100F = 52F

int level = batteryStatus != null ? 
batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) : -1; int scale = 
batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1) : -1; 
double batteryPct = (double) level / (double) scale; int percent = (int) (batteryPct * 100D);

참고URL : https://stackoverflow.com/questions/3291655/get-battery-level-and-state-in-android