flashlight application for android, code

Description:

          This is android application developed in android studio using java and XML programming language.Here is ImageView which is used to get device camera permission after on click and a button which is used to ON/OFF the flash of device. 

1. IDE used => Android studio 3.1.0
2. photo used:

drawable

(i)photo

name =btn_switch_off.PNG

(ii)photo
name =btn_switch_on.PNG

(iii)photo

name =icon.PNG

(iv)photo

name =wall.PNG

1. AndroidManifest.xml :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.dell.flashlight">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />

    <application        android:allowBackup="true"
        android:icon="@drawable/icon"
        android:label="@string/app_name"
        android:roundIcon="@drawable/icon"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Java class

class 1 :MainActivity.class :

package com.example.dell.flashlight;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Button buttonEnable;
    private ImageView imageFlashlight;
    private static final int CAMERA_REQUEST = 50;
    private boolean flashLightStatus = false;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonEnable =(Button)findViewById(R.id.buttonEnable);
        imageFlashlight =(ImageView)findViewById(R.id.imageFlashlight);


        final boolean hasCameraFlash = getPackageManager().
                hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
        boolean isEnabled = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                == PackageManager.PERMISSION_GRANTED;

        buttonEnable.setEnabled(!isEnabled);
        imageFlashlight.setEnabled(isEnabled);

        buttonEnable.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                ActivityCompat.requestPermissions(MainActivity.this, new String[] {Manifest.permission.CAMERA}, CAMERA_REQUEST);
            }
        });



        imageFlashlight.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                if (hasCameraFlash) {
                    if (flashLightStatus)
                        flashLightOff();
                    else                        flashLightOn();
                } else {
                    Toast.makeText(MainActivity.this, "No flash available on your device",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });

    }


    private void flashLightOn() {
        CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

        try {
            String cameraId = cameraManager.getCameraIdList()[0];
            cameraManager.setTorchMode(cameraId, true);
            flashLightStatus = true;
            imageFlashlight.setImageResource(R.drawable.btn_switch_on);
        } catch (CameraAccessException e) {
        }
    }



    private void flashLightOff() {
        CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

        try {
            String cameraId = cameraManager.getCameraIdList()[0];
            cameraManager.setTorchMode(cameraId, false);
            flashLightStatus = false;
            imageFlashlight.setImageResource(R.drawable.btn_switch_off);
        } catch (CameraAccessException e) {
        }
    }


    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch(requestCode) {
            case CAMERA_REQUEST :
                if (grantResults.length > 0  &&  grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    buttonEnable.setEnabled(false);
                    buttonEnable.setText("Camera Enabled");
                    imageFlashlight.setEnabled(true);
                } else {
                    Toast.makeText(MainActivity.this, "Permission Denied for the Camera", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}

layout

layout 1:activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/wall"
    tools:context=".MainActivity">
    <ImageView        android:id="@+id/imageFlashlight"
        android:layout_width="wrap_content"
       android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/btn_switch_off"
        android:contentDescription="@string/todo" />
    <Button        android:id="@+id/buttonEnable"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
       android:layout_centerHorizontal="true"
        android:textSize="20sp"
        android:text="@string/enable_camera"
        android:textStyle="bold|italic"
        android:background="#000000"
       android:textColor="#ffffff"
        android:layout_above="@id/imageFlashlight"
        android:layout_marginBottom="40dp"/>

</RelativeLayout>

values

1.color.xml

<?xml version="1.0" encoding="utf-8"?><resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
</resources>

2.strings.xml


<resources>
    <string name="app_name">flashlight</string>
    <string name="enable_camera">Enable Camera</string>
    <string name="todo">TODO</string>
</resources>

3.styles.xml


<resources>

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

dependencies

implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'