How to Make Flashlight App in Android Studio

Here are the flashlight android app code

Step 1

Create a new project in Android Studio and name it “FlashlightApp”.

Open the activity_main.xml file located in the res/layout directory. Replace the existing code with the following XML layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/flashlightImage"
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:src="@drawable/ic_flashlight_off" />

        <Button
            android:id="@+id/toggleButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Toggle Flashlight"
            android:textColor="#FFFFFF"
            android:background="#FF4081"
            android:padding="8dp"
            android:layout_marginTop="24dp"
            android:onClick="toggleFlashlight" />
    </LinearLayout>
</RelativeLayout>

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<ImageView

android:id="@+id/flashlightImage"

android:layout_width="200dp"

android:layout_height="200dp"

android:src="@drawable/ic_flashlight_off" />

<Button

android:id="@+id/toggleButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Toggle Flashlight"

android:textColor="#FFFFFF"

android:background="#FF4081"

android:padding="8dp"

android:layout_marginTop="24dp"

android:onClick="toggleFlashlight" />

</LinearLayout>

</RelativeLayout>

Step 2

Open the MainActivity.java file located in the java/<your_package_name> directory. Replace the existing code with the following Java code:

package com.example.flashlightapp;

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.ImageView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private CameraManager cameraManager;
    private String cameraId;
    private boolean isFlashlightOn;

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

        Button toggleButton = findViewById(R.id.toggleButton);
        toggleButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                toggleFlashlight(v);
            }
        });
    }

    public void toggleFlashlight(View view) {
        try {
            if (!isFlashlightOn) {
                cameraManager.setTorchMode(cameraId, true);
                isFlashlightOn = true;
                ((ImageView) findViewById(R.id.flashlightImage)).setImageResource(R.drawable.ic_flashlight_on);
            } else {
                cameraManager.setTorchMode(cameraId, false);
                isFlashlightOn = false;
                ((ImageView) findViewById(R.id.flashlightImage)).setImageResource(R.drawable.ic_flashlight_off);
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

package com.example.flashlightapp;

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.ImageView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

private CameraManager cameraManager;

private String cameraId;

private boolean isFlashlightOn;

@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];

} catch (CameraAccessException e) {

e.printStackTrace();

}

Button toggleButton = findViewById(R.id.toggleButton);

toggleButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

toggleFlashlight(v);

}

});

}

public void toggleFlashlight(View view) {

try {

if (!isFlashlightOn) {

cameraManager.setTorchMode(cameraId, true);

isFlashlightOn = true;

((ImageView) findViewById(R.id.flashlightImage)).setImageResource(R.drawable.ic_flashlight_on);

} else {

cameraManager.setTorchMode(cameraId, false);

isFlashlightOn = false;

((ImageView) findViewById(R.id.flashlightImage)).setImageResource(R.drawable.ic_flashlight_off);

}

} catch (CameraAccessException e) {

e.printStackTrace();

}

Step 3 Open the AndroidManifest.xml file located in the app/src/main directory. Replace the existing code with the following:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.flashlightapp">

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

    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.flashlightapp">

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

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

<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">

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Step 4 Open the build.gradle (Module: app) file located in the root directory of the project. Ensure that the minSdkVersion is set to 21 or higher:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.flashlightapp"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }

    lintOptions {
        checkReleaseBuilds false
        abortOnError false
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

apply plugin: 'com.android.application'

android {

compileSdkVersion 30

buildToolsVersion "30.0.3"

defaultConfig {

applicationId "com.example.flashlightapp"

minSdkVersion 21

targetSdkVersion 30

versionCode 1

versionName "1.0"

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

}

compileOptions {

sourceCompatibility = 1.8

targetCompatibility = 1.8

}

lintOptions {

checkReleaseBuilds false

abortOnError false

}

dependencies {

implementation 'androidx.appcompat:appcompat:1.3.1'

implementation 'androidx.constraintlayout:constraintlayout:2.1.0'

testImplementation 'junit:junit:4.13.2'

androidTestImplementation 'androidx.test.ext:junit:1.1.3'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

}

That’s it! You can now build and run the app on an Android device or emulator, and it will function as a flashlight.

That’s the complete code for creating a flashlight app in Android Studio using Java. However, if you’re looking to enhance the app further, here are a few suggestions:

1. Add a screen color feature: Allow users to change the screen color to different options like white, red, blue, etc., in addition to controlling the flashlight.

2. Implement a strobe light effect: Enable a strobe light mode that flashes the flashlight at a specific interval, creating a strobe light effect.

3. Add brightness control: Allow users to adjust the brightness level of the flashlight by controlling the intensity of the camera flash.

4. Include a widget: Create a widget that users can add to their device’s home screen for quick access to the flashlight functionality.

5. Support different screen orientations: Modify the app to handle screen orientation changes, ensuring a smooth user experience when rotating the device.

These are just a few ideas to extend the functionality of your flashlight app. You can explore additional features and improvements based on your requirements and creativity.

1 thought on “How to Make Flashlight App in Android Studio”

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June 27, 2023 at 2:48 pm

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