FlashlightButton.java

package com.android.systemui.statusbar.powerwidget;

import com.android.systemui.R;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.provider.Settings;

import java.util.ArrayList;
import java.util.List;

public class FlashlightButton extends PowerButton {

    private static final List<Uri> OBSERVED_URIS = new ArrayList<Uri>();
    static {
        OBSERVED_URIS.add(Settings.System.getUriFor(Settings.System.TORCH_STATE));
    }

    public FlashlightButton() { mType = BUTTON_FLASHLIGHT; }

    @Override
    protected void updateState() {
        boolean enabled = Settings.System.getInt(mView.getContext().getContentResolver(), Settings.System.TORCH_STATE, 0) == 1;
        if(enabled) {
            mIcon = R.drawable.stat_flashlight_on;
            mState = STATE_ENABLED;
        } else {
            mIcon = R.drawable.stat_flashlight_off;
            mState = STATE_DISABLED;
        }
    }

    @Override
    protected void toggleState() {
        Context context = mView.getContext();
        boolean bright = Settings.System.getInt(context.getContentResolver(),
                Settings.System.EXPANDED_FLASH_MODE, 0) == 1;
        Intent i = new Intent("net.cactii.flash2.TOGGLE_FLASHLIGHT");
        i.putExtra("bright", bright);
        context.sendBroadcast(i);
    }

    @Override
    protected boolean handleLongClick() {
        // it may be better to make an Intent action for the Torch
        // we may want to look at that option later
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.setClassName("net.cactii.flash2", "net.cactii.flash2.MainActivity");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        mView.getContext().startActivity(intent);
        return true;
    }

    @Override
    protected List<Uri> getObservedUris() {
        return OBSERVED_URIS;
    }
}