Switch Torch or Flash Light on and off

 

 

Manifest

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

above  <application>

 

XML

 <?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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:layout_gravity="center"

    tools:context="np.com.sitalmandal.project_traning.MainActivity">



    <Button

        tools:ignore="MissingConstraints"

        android:layout_height="wrap_content"

        android:layout_width="wrap_content"

        android:id= "@+id/button"

        android:onClick="TorchONButtonClick"

        android:text="torch_on"

        android:gravity="center"

    />



    <Button

        tools:ignore="MissingConstraints"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/button2"

        android:onClick="TorchOFFButtonClick"

        android:text="torch_off"

        android:gravity="center"

        />



</LinearLayout>

 

MainActivity.java

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.view.Window;

import android.view.WindowManager;

import android.content.Context;

import android.hardware.camera2.CameraAccessException;

import android.hardware.camera2.CameraManager;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;





public class MainActivity extends AppCompatActivity {



    private CameraManager cameraManager;

    private String cameraID;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

        try {

            cameraID = cameraManager.getCameraIdList()[0]; // 0 is for back camera and 1 is for front camera

        } catch (Exception e) {

            e.printStackTrace();

        }

        

    }



    public void TorchOFFButtonClick(View view){

        try {

            Toast.makeText(getApplicationContext(), "OFF", Toast.LENGTH_SHORT).show();

            cameraManager.setTorchMode(cameraID, false);



        } catch (Exception e) {

            e.printStackTrace();

        }

    }



    public void TorchONButtonClick(View view) {

        try {

            Toast.makeText(getApplicationContext(), "On", Toast.LENGTH_SHORT).show();

            cameraManager.setTorchMode(cameraID, true);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}