Build Simple TorchLight App in Android

 Hello Guys,

    In this tutorial , we will make you simple TorchLight App. we will create these app for android mobile using android studio with step by step. if you follow step carefully , so you will make your own android torchlight application with an easy method. TorchLight App MainScreen looking like below picture:

Let's get started.

Step 1 : Add Permission in Android-Manifest.xml

• Here you need to add features in Android-Manifest.xml file. Here camera.flash features is needed to add in Android-Manifest.xml file for making torchlight in mobile.

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

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/torch"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Torch">
        <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>

Step 2 : activity_main.xml 

• activity_main.xml file contain RelativeLayout which contain Button. Button is used to making torch on or off.

<?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"
    tools:context=".MainActivity">

    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn_torch"
        android:text="TORCH ON"
        android:layout_centerInParent="true"
        />


</RelativeLayout>

Step 3 : MainActivity.java

• Here we create CameraManager object. CameraManager object interact with camera services. 

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    Button btnTorch;
    boolean IsTorchOn = false;
    CameraManager cameraManager;
    String cameraId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnTorch  = findViewById(R.id.btn_torch);

        //Check Torch Avaliable or not
        boolean TorchAvailable = getApplicationContext().getPackageManager().
                     hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
        if (!TorchAvailable)
        {
            btnTorch.setEnabled(false);
            btnTorch.setText("Torch Not Available");
        }


        try {
            cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
            cameraId = cameraManager.getCameraIdList()[0];
        } catch (Exception e) {
            e.printStackTrace();
        }

        btnTorch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if(IsTorchOn)
                {
                    //torch off here
                       IsTorchOn = false;
                       btnTorch.setText("TORCH ON");

                }
                else
                {
                    //torch on here
                      IsTorchOn = true;
                       btnTorch.setText("TORCH OFF");
                }
                SwitchTorch(IsTorchOn);
            }
        });
    }

    public void SwitchTorch(boolean status)
    {
        try{
             cameraManager.setTorchMode(cameraId,status);
        }
        catch (Exception e){

        }
    }
}

 

Output :  

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