Opening Flashlight of Galaxy Nexus

Question

I am developing an app which needs to open the flashlight of my Galaxy Nexus device. I have referred to the post here

LED flashlight on Galaxy Nexus controllable by what API?

public class TestCamera extends Activity implements SurfaceHolder.Callback{
Camera mCamera;
public static SurfaceView preview;
public static SurfaceHolder mHolder;
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    preview = (SurfaceView) findViewById(R.id.camSurface);
    mHolder = preview.getHolder();
    mCamera = Camera.open();
    try {
        mCamera.setPreviewDisplay(mHolder);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    Button onLEDbtn = (Button) findViewById(R.id.onLED_btn);
    onLEDbtn.setOnClickListener(new OnClickListener(){

        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplicationContext(), "test", Toast.LENGTH_SHORT).show();
            Parameters params = mCamera.getParameters();
            params.setFlashMode(Parameters.FLASH_MODE_TORCH);
            mCamera.setParameters(params);      
            mCamera.startPreview();
        }

    });
}



}


    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub

    }


    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        mHolder = holder;
        try {
            mCamera.setPreviewDisplay(mHolder);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
         mCamera.stopPreview();
            mHolder = null;
    }




}

Manifest:

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

However, I still cant switch on the flashlight. Could anyone point out my errors? Thanks

you can find everything in here http://stackoverflow.com/questions/6068803/how-turn-on-only-camera-flash-light-programmatically-in-android — user219882, May 24 '12 at 09:40
possible duplicate of [Unable to use the flashlight in Galaxy Nexus](http://stackoverflow.com/questions/10731285/unable-to-use-the-flashlight-in-galaxy-nexus) — Andro Selva, May 24 '12 at 09:47
Above is my manifest file Moreover, I added the camSurface view inside main.xml Will it be a problem? I can get the toast message but cannot switch on the flashlight... Please help. Thanks!! — user1311794, May 24 '12 at 10:41
Solved! mHolder.addCallback(this); should be add after mHolder = preview.getHolder(); — user1311794, May 24 '12 at 11:21

score 7 · Answer 1 · answered Jul 13 '12 at 03:25

7

you must to set call back mHolder.addCallback(this);

answered Jul 13 '12 at 03:25

Kingkan Banyenngam

123
1
1
6

score 0 · Answer 2 · edited May 23 '17 at 11:43

0

Try to add :

android:name="android.permission.FLASHLIGHT"
android:name="android.hardware.camera.flash

And look this post : How to turn on camera flash light programmatically in Android?

edited May 23 '17 at 11:43

Community

1
1

answered May 24 '12 at 09:42

Skies

407
2
6

I have the following manifest However it does not work. – user1311794 May 24 '12 at 09:54
i've found this post : http://stackoverflow.com/questions/9505945/led-flashlight-does-not-work-on-samsung-galaxy-nexus – Skies May 24 '12 at 09:59
and this one : http://stackoverflow.com/questions/8876843/led-flashlight-on-galaxy-nexus-controllable-by-what-api/9379765#9379765 – Skies May 24 '12 at 10:00
I have followed these posts to develop my app. However, it does not work – user1311794 May 24 '12 at 10:06
I think I could not help you more than that. Sorry. – Skies May 24 '12 at 12:06

score 0 · Answer 3 · answered May 24 '12 at 09:42

0

You need to add this tag in manifest file.

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

answered May 24 '12 at 09:42

Shrikant Ballal

7,067
7
41
61

Opening Flashlight of Galaxy Nexus

3 Answers3

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