how to check if device has flash light led android

问题:

How can I check if a device has a camera led (flashlight). I am talking about devices with android OS?

I have seen solutions some solutions which talks about how to turn the led on and off but what will happen if the device doesn't even has a led.

for turning on the camera I am using camera.open()

回答1:

The other answers

boolean hasFlash = this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

Does not work for the new 2013 Nexus 7. The following code will work:

public boolean hasFlash() {
        if (camera == null) {
            return false;
        }

        Camera.Parameters parameters = camera.getParameters();

        if (parameters.getFlashMode() == null) {
            return false;
        }

        List<String> supportedFlashModes = parameters.getSupportedFlashModes();
        if (supportedFlashModes == null || supportedFlashModes.isEmpty() || supportedFlashModes.size() == 1 && supportedFlashModes.get(0).equals(Camera.Parameters.FLASH_MODE_OFF)) {
            return false;
        }

        return true;
    }

回答2:

getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH) returns true if the device has flash. See this for more details

回答3:

You should be able to check whether the flash is available by checking system features:

boolean hasFlash = this.getPackageManager()
                       .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

(provided you are in an Activity). If not, than use some sort of context in place of this.

P.S. Note that this information is quite easy to find if you actually try searching for it.

回答4:

PackageManager pm = context.getPackageManager();
        if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
            Log.e("err", "Device has no camera!");
            return;
        }       
        camera = Camera.open();
        p = camera.getParameters();
        flashModes = p.getSupportedFlashModes();
if(flashModes==null){
                        Toast.makeText(getApplicationContext(), "LED Not Available",Toast.LENGTH_LONG).show();
                }else
                {
Toast.makeText(getApplicationContext(), "LED  Available",Toast.LENGTH_LONG).show();
}