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POAndroid Life Cycle Issue
 

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  1. POAndroid Life Cycle Issue
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    <p>I am developing a flashlight application and I want to have it set up to where when the user opens the application, the screen brightness goes to full. I have set up a checkbox preference to do this but have a slight problem. See code below:</p> <pre><code>&lt;CheckBoxPreference android:defaultValue="true" android:key="pref_brightness" android:summary="When checked, brightness will raise to highest level on main activity." android:title="@string/pref_5" /&gt; </code></pre> <blockquote> <p>This is the checkbox code in the xml file for the preferences layout.</p> </blockquote> <pre><code>SharedPreferences getPrefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); boolean box = getPrefs.getBoolean("pref_brightness", true); if (box == true) { WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = 100 / 100.0f; getWindow().setAttributes(lp); } </code></pre> <blockquote> <p>And here is where I access the preference inside the MainActivity.java file. This is in the onCreate() method.</p> </blockquote> <p>Now my problem is...when I open the application, the box is checked (unless altered by the user) and the brightness maximizes like it should. However, when I go into the preferences and uncheck the box, then press the "back" button, the box saves but nothing takes effect on the main activity. If I change the box and press the "up" button on the action bar, everything works great. Why is it not working when the back button is pressed? I tried using onBackPressed() but nothing seemed to fix this issue.</p> <h2>**Update according to "Karakuri's" answer:**</h2> <blockquote> <p>I did what you said and it still doesn't work right. If the box is unchecked and I go check it, press the back button, it works but then if I go change it back again, press back again, it doesn't save. Here's the code for your suggestion:</p> </blockquote> <pre><code>@Override public void onWindowFocusChanged(boolean hasFocus) { SharedPreferences getPrefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext()); boolean box = getPrefs.getBoolean("pref_brightness", true); if (box == true) { WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.screenBrightness = 100 / 100.0f; getWindow().setAttributes(lp); } super.onWindowFocusChanged(hasFocus); } </code></pre> <p>Help is appreciated,</p> <p>Andrew</p>
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    1. COIn which lifecycle callback do you set the window attributes?
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    2. CO@Karakuri -- In onCreate().
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      1. USAndrew Quebe
 

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