StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAndroid dev - Issue with using SeekBar
text
Body
copied!<p>I'm trying to implement a SeekBar in a simple flashlight app (that I'm learning on) and cannot understand why the app keeps crashing when I set the OnSeekBarChangeListener to my SeekBar. As soon as a remove all of the code inside the onStopTrackingTouch() for the listener, the app runs fine. But if there is anything at all inside the listener's methods, it crashes. I'm also using buttons and gestures in the app and have not had any problems using those.</p> <p>I am bringing up a separate layout when the user presses the Menu button | Brightness option, which displays the SeekBar (to adjust the brightness)</p> <p>Here is the how I am implementing the SeekBar:</p> <pre><code>SeekBar mSeekBar; ... @Override public void onCreate(Bundle savedInstanceState){ setContentView(R.layout.main); ... mSeekBar = (SeekBar)findViewById(R.id.mSeekbar); mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { //first set the brightness mode to manual Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); //change the actual setting WindowManager.LayoutParams lp = getWindow().getAttributes(); float brightness = Float.valueOf(seekBar.getProgress()); //change the brightness here lp.screenBrightness = brightness; getWindow().setAttributes(lp); //set the new brightness } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub } }); </code></pre> <p>Thank you for your time and advice.</p> <p>UPDATE: Here is the link to my Logcat info <a href="http://pastie.org/2561098" rel="nofollow">http://pastie.org/2561098</a> </p> <p>UPDATE 2: Here is the link to my release run LogCat info: <a href="http://pastie.org/2561111" rel="nofollow">http://pastie.org/2561111</a> </p> <p>SOLVED:</p> <p>I had mSeekBar being instantiated and the listener's set before the layout was present. The SeekBar was null because the separate layout I made for adjusting the brightness was not currently in view. Putting the instantiation and listener's inside the switch statement I use for options menu, after the new layout (for the brightness) is set works perfectly.</p> <p>Thank you!</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload