Android Development And Discussion: Flash Light Example

Hi Friends,

Today i am going make a code for on/off Flash Light of your Android mobile follow the mention below code:

Example:

Code:

activity_main.xml

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/radial_background"

android:orientation="vertical" >

<ToggleButton

android:id="@+id/toggleButton1"

android:layout_width="153dp"

android:layout_height="wrap_content"

android:layout_gravity="center"

android:layout_marginTop="100dp"

android:text="@string/toggal"

android:textOff="@string/off"

android:textOn="@string/on"

android:textStyle="bold" />

</LinearLayout>

MainActivity.java

package in.androiddevelopmentanddiscussion.flashlightexample;

import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ToggleButton;

public class MainActivity extends Activity {

ToggleButton btn;
private Camera camera;
private boolean isFlashOn;
private boolean hasFlash;
Parameters params;
MediaPlayer mp;

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

// flash switch button
btn = (ToggleButton)findViewById(R.id.toggleButton1);

/*
* First check if device is supporting flashlight or not
*/
hasFlash = getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

if (!hasFlash) {
// device doesn't support flash
// Show alert message and close the application
AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
.create();
alert.setTitle("Error");
alert.setMessage("Sorry, your device doesn't support flash light!");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// closing the application
finish();
}
});
alert.show();
return;
}

btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if (btn.isChecked()) {
turnOnFlash();
}
else{
turnOffFlash();
}

}
});

// get the camera
getCamera();

}

// getting camera parameters
private void getCamera() {
if (camera == null) {
try {
camera = Camera.open();
params = camera.getParameters();
} catch (RuntimeException e) {
Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
}
}
}

/*
* Turning On flash
*/
private void turnOnFlash() {
if (!isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
playSound();

params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
isFlashOn = true;

// changing button/switch image
//toggleButtonImage();
}

}

/*
* Turning Off flash
*/
private void turnOffFlash() {
if (isFlashOn) {
if (camera == null || params == null) {
return;
}
// play sound
playSound();

params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params);
camera.stopPreview();
isFlashOn = false;

// changing button/switch image
//toggleButtonImage();
}
}

/*
* Playing sound
* will play button toggle sound on flash on / off
* */
private void playSound(){
if(isFlashOn){
mp = MediaPlayer.create(MainActivity.this, R.raw.light_off);
}else{
mp = MediaPlayer.create(MainActivity.this, R.raw.light_on);
}
mp.setOnCompletionListener(new OnCompletionListener() {

@Override
public void onCompletion(MediaPlayer mp) {

mp.release();
}
});
mp.start();
}

}

Manifest

Add below mention permission in your Manifest File

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

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

Download full project from here