Make Flashing Application in Android

02:11
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Now i am telling you how can you make Flashing application in android. This application is about turning on and off device flashlight / torchlight with simple touch.
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Dowload above image without animation

Follow below step to make these type of application :
Step 1: Designing the Application
In this application we'll not use very complex designing which give you a easy and attractive application in android.
I am not giving you designing steps involved in designing the application as it is not the part of the tutorial.
Once you are done with designing part you can move to coding part by starting a new project.
Now come on coding
Step 2: Create new Project

  • Create a new project in Eclipse IDE by going to File ⇒ New ⇒ Android Application Project . I named my package as com.androidhive.flashlight and main activity as MainActivity.java
  • Open your AndroidManifest.xml file and add required permissions.

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidhive.flashlight"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
   
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.androidhive.flashlight.MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

  • Place all the switch image files under drawable-hdpi, drawable-mdpi, drawable-ldpi folders. 
  • Create a new xml file named radial_background.xml under res ⇒ drwable-hdpi folder and paste the following code. This file is used to create radial gradient background for the app. 

radial_background.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
            android:type="radial"
            android:startColor="#343030"
            android:endColor="#151515"
            android:gradientRadius="300"
            android:angle="270"
            android:centerY="0.3"/>
</shape>

  • Now open activity_main.xml file located under res ⇒ layout folder and type the following code. This layout file acts as main screen of the application. 
activity_main.xml
<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"
    android:background="@drawable/radial_background"
    tools:context=".MainActivity" >

    <ImageButton
        android:id="@+id/btnSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dip"
        android:src="@drawable/btn_switch_on"
        android:background="@null"
        android:contentDescription="@null"
         />
</RelativeLayout>

  • Open your MainActivity.java file and do the following changes. Here we just declared required variables.

MainActivity.java
package com.androidhive.flashlight;
 import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;
public class MainActivity extends Activity {
     ImageButton btnSwitch;
     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
        btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);
          // 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;
        }
         // get the camera
        getCamera();
                 // displaying button image
        toggleButtonImage();
               // Switch button click event to toggle flash on/off
        btnSwitch.setOnClickListener(new View.OnClickListener() {
             @Override
            public void onClick(View v) {
                if (isFlashOn) {
                    // turn off flash
                    turnOffFlash();
                } else {
                    // turn on flash
                    turnOnFlash();
                }
            }
        });
    }  
    // Get the camera
    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_switch_off);
        }else{
            mp = MediaPlayer.create(MainActivity.this, R.raw.light_switch_on);
        }
        mp.setOnCompletionListener(new OnCompletionListener() {
             @Override
            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                mp.release();
            }
        }); 
        mp.start();
    }
         /*
     * Toggle switch button images
     * changing image states to on / off
     * */
    private void toggleButtonImage(){
        if(isFlashOn){
            btnSwitch.setImageResource(R.drawable.btn_switch_on);
        }else{
            btnSwitch.setImageResource(R.drawable.btn_switch_off);
        }
    }
     @Override
    protected void onDestroy() {
        super.onDestroy();
    }
     @Override
    protected void onPause() {
        super.onPause();
         
        // on pause turn off the flash
        turnOffFlash();
    }
     @Override
    protected void onRestart() {
        super.onRestart();
    }
     @Override
    protected void onResume() {
        super.onResume();
         // on resume turn on the flash
        if(hasFlash)
            turnOnFlash();
    }
     @Override
    protected void onStart() {
        super.onStart();
                 // on starting the app get the camera params
        getCamera();
    }
     @Override
    protected void onStop() {
        super.onStop();
       // on stop release the camera
        if (camera != null) {
            camera.release();
            camera = null;
        }
    }
 }
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