Android Flashlight

You must add the permission  in AndroidManifest.xml:

1 2	<uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" />

Main.xml

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

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

    <Button 

        android:id="@+id/on_btn"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Turn Flash ON" />

</LinearLayout>

MAinactivity

import javax.security.auth.PrivateCredentialPermission;

import android.hardware.Camera;

import android.hardware.Camera.Parameters;

import android.os.Bundle;

import android.app.Activity;

import android.content.pm.PackageManager;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

private Button mOnBtn;

    private Button mOffBtn;

    private Camera mCamera;

    private boolean flash_ok=false;

   private boolean checkoff=true;

   

    

    

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

flash_ok=getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

        mOnBtn = (Button) findViewById(R.id.on_btn);

        

        mOnBtn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(mCamera==null){

mCamera=Camera.open();

}

 

if (checkoff)

{

if(flash_ok)

{

processOnClick();

 checkoff=false;

 

 

}else{

Toast.makeText(getApplicationContext(), "No Flash Light", Toast.LENGTH_SHORT).show();

}

}

else

{

processOffClick();

checkoff=true;

}

}

});

       

    }

private void processOffClick(){

        if( mCamera != null ){

            Parameters params = mCamera.getParameters();

            params.setFlashMode( Parameters.FLASH_MODE_OFF );

            mCamera.setParameters( params );

            mCamera.release();

            mCamera = null;

            mOnBtn.setText("Turn Flash ON");

        }

    }

private void processOnClick(){

        if( mCamera != null ){

            Parameters params = mCamera.getParameters();

            params.setFlashMode( Parameters.FLASH_MODE_TORCH );

            mCamera.setParameters( params );

            mOnBtn.setText("Turn Flash OFF");

        }

    }

@Override

protected void onResume() {

if(mCamera==null)

mCamera=Camera.open();

super.onResume();

}

@Override

protected void onDestroy() {

if(mCamera!=null){

mCamera.release();

}

super.onDestroy();

}

// @Override

// public void onBackPressed() {

// this.finish();

// super.onBackPressed();

// }

@Override

protected void onPause() {

super.onPause();

         

       // on pause turn off the flash

//        processOffClick();

}

}