CODEWITHSUNDEEP
androidandroid-activityandroid-camera
kim caboteja
kim caboteja

Reputation: 55

Why is my Flashlight Turning off when clicking a button with intent function?

I am new to android programming and I don't understand why my flashlight is turning off when clicking a button that starts another Activity with an Intent? I have searched for this but found nothing similar. I looked at others' ideas but the closest one is to use a Service instead of an Activity from my main activity. Is it okay to change my Activity to a Service or is another way to resolve this?

 tbOnOff = (ToggleButton) findViewById(R.id.togglebutton);

 tbOnOff.setOnCheckedChangeListener(new     CompoundButton.OnCheckedChangeListener() {
 public void onCheckedChanged(CompoundButton buttonView,
         boolean isChecked) {
     if (isChecked) {
         if (camera == null) {
             camera = Camera.open();
             parameters = camera.getParameters();
             parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
             camera.setParameters(parameters);
         }
     } else {
         if (camera != null) {
             parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
             camera.setParameters(parameters);
             camera.release();
             camera = null;
         }
     }
 }
 });

 boolean checkFlash = context.getPackageManager().hasSystemFeature(
     PackageManager.FEATURE_CAMERA_FLASH);
 if (!checkFlash) {
 tbOnOff.setEnabled(false);
 Toast.makeText(context, "LED Not Available!", Toast.LENGTH_LONG)
         .show();
 }
}

// release camera when onPause called

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    if (camera != null) {
        parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
        camera.setParameters(parameters);
        camera.release();
        camera = null;
    }
}

public void send(View arg1) {
    Intent i = new Intent(this, InformationActivity.class);         
    startActivity(i);
}

that's my code for LED light and the Intent.

Upvotes: 0

Views: 135

Answers (1)

ci_
ci_

Reputation: 8774

When you start a new Activity it will be brought to the foreground straight away, which means that you're original Activity will be paused straight away too. Since you're turning off the flashlight in your onPause(), well that's what it does.

As to your other question, yes, if you want the flashlight to stay on independent of the Activity lifecycle, a Service would be a way to do this, as anything else you want to be independent of Activity lifecycles.

Upvotes: 2

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