Приложение “Фонарик”

MainActivity:

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private Button bFlash;
    private FlashClass flashClass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }
    private void init()
    {
       bFlash = findViewById(R.id.b1);
       flashClass = new FlashClass(this);

    }
    public void onClickFlash(View view)
    {
      if(flashClass.isFlash_status())
      {
       flashClass.flashOff();
       bFlash.setText("On");
          bFlash.setBackgroundResource(R.drawable.circle_green);

      }
      else
      {
         flashClass.flashOn();
          bFlash.setText("Off");
          bFlash.setBackgroundResource(R.drawable.circle_red);
      }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(flashClass.isFlash_status())
        {
          flashClass.flashOff();
        }
    }
}

FlashClass:

import android.content.Context;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;

public class FlashClass {
    private boolean flash_status = false;
    private Context context;

    public FlashClass(Context context) {
        this.context = context;
    }
    public void flashOn()
    {
        CameraManager cameraManager = (CameraManager)context.getSystemService(Context.CAMERA_SERVICE);
        try {
            assert cameraManager != null;
            String cameraId = cameraManager.getCameraIdList()[0];
            cameraManager.setTorchMode(cameraId, true);
            flash_status = true;


        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

    }
    public void flashOff()
    {
        CameraManager cameraManager = (CameraManager)context.getSystemService(Context.CAMERA_SERVICE);
        try {
            assert cameraManager != null;
            String cameraId = cameraManager.getCameraIdList()[0];
            cameraManager.setTorchMode(cameraId, false);
            flash_status = false;


        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

    }

    public boolean isFlash_status() {
        return flash_status;
    }
}

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#008577</color>
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
    <color name="colorRed">#FF0000</color>
    <color name="colorGreen">#1CEB05</color>
    <color name="colorBlack">#161616</color>
    <color name="white">#FEFEFE</color>
</resources>

circle_green.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
    <stroke android:width="4dp" android:color="@color/colorGreen"/>
    <solid android:color="@android:color/transparent"/>



</shape>

circle_red.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
    <stroke android:width="4dp" android:color="@color/colorRed"/>
    <solid android:color="@android:color/transparent"/>



</shape>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="@color/colorBlack"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/b1"
        android:layout_width="190dp"
        android:layout_height="190dp"
        android:background="@drawable/circle_green"
        android:onClick="onClickFlash"
        android:text="On"
        android:textColor="@color/white"
        android:textSize="36sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.713" />
</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

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

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

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

</manifest>