Simple Torch App for Android

How to create simple torch application in android

First create simple app with empty activity, clear all padding and set all default thing.

Secondly create two identified buttons or Image Buttons is up to development requirement.

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

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

    android:orientation="vertical" android:layout_width="match_parent"

    android:layout_height="match_parent">

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:src="@drawable/off"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="true"
        android:id="@+id/off"
        android:onClick="Torch"
        />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:src="@drawable/on"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="true"
        android:id="@+id/on"
        android:onClick="Torch"
        android:visibility="gone"

        />

</RelativeLayout>

Now, to create torch app, we required permissions and access to control camera and its feature flash light.

For permission go to manifest.xml and change in existing code for permissions.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.user.mesale">
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.FLASHLIGHT"/>
    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.flash"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

No go to activity’s java class and create following code

public class MainActivity extends AppCompatActivity {

ImageButton on,off;
Camera camera;
Camera.Parameters parameters;
boolean isFlash = false;

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

on = (ImageButton) view.findViewById(R.id.on);
        off = (ImageButton) view.findViewById(R.id.off);
        if (view.getContext().getApplicationContext().getPackageManager().hasSystemFeature(view.getContext().getPackageManager().FEATURE_CAMERA_FLASH)){
            isFlash=true;
            camera=Camera.open();
            parameters = camera.getParameters();
            parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            camera.setParameters(parameters);
            camera.startPreview();
        }else {
            Toast.makeText(getActivity(),"Please Install Camera",Toast.LENGTH_LONG).show();
        }

        on.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                camera.setParameters(parameters);
                camera.startPreview();
                on.setVisibility(View.GONE);
                off.setVisibility(View.VISIBLE);
            }
        });

        off.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                camera.setParameters(parameters);
                camera.stopPreview();
                on.setVisibility(View.VISIBLE);
                off.setVisibility(View.GONE);
            }
        });

    }

    @Override
    public void onStop() {
        super.onStop();
        if(camera!=null){
            camera.release();
        }
    }

   }
}