SleepButton.java

package com.android.systemui.statusbar.powerwidget;

import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.os.SystemClock;

import com.android.systemui.R;

public class SleepButton extends PowerButton {

    public SleepButton() {
        mType = BUTTON_SLEEP;
    }

    @Override
    protected void updateState() {
        mIcon = R.drawable.stat_sleep;
        mState = STATE_DISABLED;
    }

    @Override
    protected void toggleState() {
        PowerManager pm = (PowerManager) mView.getContext().getSystemService(Context.POWER_SERVICE);
        pm.goToSleep(SystemClock.uptimeMillis() + 1);
    }

    @Override
    protected boolean handleLongClick() {
        Intent intent = new Intent("android.settings.DISPLAY_SETTINGS");
        intent.addCategory(Intent.CATEGORY_DEFAULT);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        mView.getContext().startActivity(intent);
        return true;
    }
}