com.macleod2486.androidswissknife.components.Flashlight.java Source code

Introduction

Here is the source code for com.macleod2486.androidswissknife.components.Flashlight.java

Source

/*
AndroidSwissKnife
Copyright (C) 2016  macleod2486
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see [http://www.gnu.org/licenses/].
 */

package com.macleod2486.androidswissknife.components;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

public class Flashlight implements View.OnClickListener {
    FragmentActivity activity;
    boolean torchOn = false;
    int requestCode;

    Camera cam;
    Camera.Parameters p;

    public Flashlight(FragmentActivity activity, int code) {
        this.requestCode = code;
        this.activity = activity;
    }

    @Override
    public void onClick(View view) {
        Log.i("Flashlight", "Current toggle " + torchOn);

        if (checkPermissions()) {
            if (torchOn) {
                turnOffLight();
            } else {
                turnOnLight();
            }
        }
    }

    public void toggleLight() {
        if (torchOn) {
            turnOffLight();
        } else {
            turnOnLight();
        }
    }

    private void turnOnLight() {
        Log.i("Flashlight", "Toggling on light");

        try {
            cam = Camera.open();
            p = cam.getParameters();
            p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            cam.setParameters(p);
            SurfaceTexture mPreviewTexture = new SurfaceTexture(0);
            cam.setPreviewTexture(mPreviewTexture);
            cam.startPreview();
            torchOn = true;
        } catch (Exception ex) {
            torchOn = false;
            Log.e("Flashlight", ex.toString());
        }
    }

    private void turnOffLight() {
        Log.i("Flashlight", "Toggling off light");

        torchOn = false;

        cam.stopPreview();
        cam.release();
    }

    private boolean checkPermissions() {
        boolean allowed = false;

        if (ContextCompat.checkSelfPermission(activity,
                Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.CAMERA)) {
                Toast.makeText(activity.getApplicationContext(), "Need to enable camera permissions",
                        Toast.LENGTH_SHORT).show();
            } else {
                ActivityCompat.requestPermissions(activity, new String[] { Manifest.permission.CAMERA },
                        requestCode);
            }
        } else {
            allowed = true;
        }

        return allowed;
    }
}