Android :: Simple Example Of Changing Screen Brightness For An Activity?
May 30, 2010
There are apparently at least three different techniques for changing screen brightness in the Android OS. Two of them no longer work post-cupcake and the third accepted technique evidently has a bug. I would like to increase screen brightness at the start of a one-view activity then turn the brightness back to the user setting at the end of the activity. No buttons, no second view or second activity. Just a maxed brightness at start and a return to original brightness setting at the end of the activity. The examples of the current technique using WindowManager.LayoutParams that I have located range from 2 lines of code
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 100 / 100.0f;
getWindow().setAttributes(lp);
To several pages of source code and numerous activities. Is there a simple example of maxing the screen brightness at start that someone can provide a link to?
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Aug 1, 2010
I set auto brightness off and turn it all the way down cause the screen itself is bright already. but sometimes my brightness setting keep changing. i think an app does that?
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Sep 17, 2010
I want to change the screen brightness programmatically in android.
WindowManager.LayoutParams lp = getWindow().getAttributes();
float brightness=1.0f;
lp.screenBrightness = brightness;
getWindow().setAttributes(lp);
But this sample code works on cutcake, not on latest versions. I am using latest version of SDK. How can I do it?
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Oct 5, 2010
Can screen brightness changes be tested in the Android emulator? I've tried various examples that all use the following code snippet:
WindowManager.LayoutParams lp = window.getAttributes();
lp.screenBrightness = (*some float percentage*);
window.setAttributes(lp);
But I don't see any change in brightness in the emulator. I've tested it in cupcake and 2.2.
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Jul 20, 2010
I am in my fourth activity and I want to come back to the first activity directly (without closing the second and third activity). How to change to the activity directly?
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Aug 31, 2010
Just like the title says, Is there a simple line of code I could add to onStop()that will simply stop any gps activity currently going on with my application?
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Feb 19, 2010
I have a basic calculator app I'm making. Two activities, the main one and ResultView.
I've made it where I click a button on activity A to go to activity B. The log says activity B is started and "displayed" successfully, the title for the new activity loads, but the body does NOT show. I added a simple Text view with static text.. see the result.xml at the bottom. I also tried inserting information programmatically, but that didn't do.
When I debug the program, I tried putting breakpoints as the activity is called with startActivity() as well as on the first line of the onCreate method within the ResultView class (my activity "B") but the program never hits the second breakpoint. In fact, it looks as if Looper.class is called in the end.
This bit of code is placed in the button handler on acitivity A:
CODE:........
The activity is in the manifest, within the "application" tag:
CODE:....................
If more info is needed, let me know...in short, "HELLO WORLD" does not display at all.
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Jun 1, 2010
I am writing simple app that will read callLog content provider transform data and write it to my own table. my app will not show data directly from calllog content provider.
1. now one problem that I have is I cannot limit how much rows query will return (by calling activity.managedQuery) but I assume that Cursor delays access to the db and I can use moveToNext as many times as desired to get few rows from table and the call will be efficient. is that good thinking?? OR am I wrong here? I really dont want to query all rows from table. is there any other way to access calllog??
2. I dont want to implement my own content provider for my app. I will use rawQuery many times and group data so contentprovider's callbacks are not enough for me. more I want my dao to be private to my application so I think there is no need to bother with conentprovider. and If I got this right I also dont need to bother with activity.startManagingCursor as long I query data inside same method call (because I need to deactivate all intermediate Cursor objects anyway)
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Apr 14, 2010
I am using a simple frame animation and when I exit and reenter my activity the activity is still referenced in memory.
//This is a sample activity I created to simulate the problem public class MemoryLeakActivity extends Activity {
@Override public void onCreate(final Bundle savedInstanceState) super.onCreate(savedInstanceState);
} @Override public boolean onKeyDown(final int keyCode, final KeyEvent event) {
final Intent i = new Intent(MemoryLeakActivity.this, LeakyActivy.class);
startActivity(i); return super.onKeyDown(keyCode, event);
} }
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Oct 1, 2010
I have a simple activity program in android. Basically the class just extends Activity.
But when I start it I get a ClassCastException in the constructor of my class. I don't even have a constructor defined, so it must be in the constructor of the superclass which is Activity. Unfortunately the debugger doesn't give any detailed information on what class it is trying to cast. Here is the stacktrace:
Thread [<1> main] (Suspended (exception RuntimeException))
ActivityThread$PackageInfo.makeApplication(boolean, Instrumentation) line: 649
ActivityThread.handleBindApplication(ActivityThread$AppBindData) line: 4232
ActivityThread.access$3000(ActivityThread, ActivityThread$AppBindData) line: 125
ActivityThread$H.handleMessage(Message) line: 2071
ActivityThread$H(Handler).dispatchMessage(Message) line: 99
Looper.loop() line: 123
ActivityThread.main(String[]) line: 4627
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 521
ZygoteInit$MethodAndArgsCaller.run() line: 868
ZygoteInit.main(String[]) line: 626
NativeStart.main(String[]) line: not available [native method]
And when I look into this runtimeexception I get:
detailMessage "Unable to instantiate application com.test.MyApp: java.lang.ClassCastException: com.test.MyApp" (id=830067694464)
The only code is:
package com.test;
import android.app.Activity;
public class MyApp extends Activity {
}
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Jun 21, 2010
I have a very simple listview going on. The list just consists of strings, when you click the string it opens a new activity blah blah. Here's the problem, I enabled settextfilter and while it did filter the list, when you click the result, it always performs the action of the string located at zero, and not the one it is supposed to.
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Jun 23, 2010
I am trying to display a dialog box in a simple Java class that is called from my main Activity but not successful. Please help me to figure it out.
I am passing the required values as parametrs.
I have two class: class MainActivity extends Activity :: Main *starting point *of Application class ShowMyDialog :: a simple java program In which I *generate an URl* and *display a dialog with WebView*.
I am passing the Acitivity from my MainActivity to this class as a parameter in function.
But I am *unable to call* the onCreateDialog method that I have *defined in the simple java class.
However, If I define the *onCreateDialog method in MainActivity, I am able to display it successfully.
What Should I pass as Parameter to the non Activity class from MainActivity class so that I am able to display the dialog as defined by showdialog method in JAVA class ???*
My steps of source code is as follow:
code:.........................
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Oct 27, 2010
Anybody have any idea why this is not working under 2.2? (nexus one)
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 1.0f; getWindow().setAttributes(lp);
And yes, the auto-brightness is disabled under settings.
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Nov 17, 2009
I use the following code to dim the screen in one of my apps...
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Oct 28, 2010
I'm trying to control to turn screen off/on. I'm using device HTC G1 (1.6). To turn off screen I write:
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 0f;
getWindow().setAttributes(lp);
But if I want to turn on screen:
lp.screenBrightness = 1f;
getWindow().setAttributes(lp);
Screen not turn on.
if lp.screenBrightness = 0.02f;
screen change bright, but not turn off.
Which right way to control by screen?
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Mar 13, 2010
To save power I keep the screen brightness down low - what I want to know is - is there any app that overrides this setting when my phone rings so that the screen goes to full brightness so I can tell properly who is calling me?
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Oct 1, 2010
I have no clue how to disable the "auto screen brightness" in settings?
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Nov 15, 2012
I have a htc sensation xl. My brightness control stopped working and I now I can't change the brightness anymore. It doesn't matter if I set to 30% or 100%, the brightness stays the same.I can only adjust the brightness from 0 to 25%. I already did and wipe and stiched a phone.
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Jul 23, 2010
So, what do you guys keep your screen brightness level at? I never use auto-brightness. I usually keep mine at 40-50%, day and night
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Jan 31, 2010
When i launch Activity A, the screen goes black, then dark-gray. Then A launches B, and the screen goes black and dark-gray again. Is there a way to set the default background color to black? Activity A has no screen, its just a stub that calls B.
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Jul 24, 2010
I created an activity by using a layout written in a XML file. I would like, in response to some events, to change the content of this activity. I would like to show a VideoView over the content. In response to some other event, I may want to go back to the first content. Would it be possible to switch the content of the activity this way without running another activity (I have another technical difficult in doing that)? I tried using setContentView( videoView), and then switching back with setContentView(T.layout.main), but it seems that, when going back to the main layout, all my buttons and text boxes are created again as they were new. Would it be possible to go back to the last state of all the controls?
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Jul 7, 2009
I finally got to the point where I was ready to deploy my app to my G1 and test it out and the first thing I noticed was that when I change my phone to landscape view my main activity restarts and resets all of my variables to their default settings. How can I avoid this?
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Jan 13, 2013
I have a Android tablet and I want to use it as a second screen for my computer. Of course there is Apps for this like iDisplay, but it's not at all comfortable, and i prefer USB. So is it possible to use the tablet like a second screen only ? Turn off Android and just use the screen of the device ?With Windows 8 we can easily share the screens, and i want to optimise that point...
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Jul 17, 2010
What is yours set on?
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Jul 24, 2010
This screen is unnecessarily bright in total darkness- is there a better screen brightness app that can bring the backlight down more than the settings allow?
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May 27, 2010
I am very anal about the brightness setting. I keep the setting very low to save battery. While indoors this is almost never a problem but when I go outside I can't see the screen. This makes it very hard to change the brightness. How do other people solve this or am I the only one that has this problem? Does anyone know of a way to map a button (like home button) and change the operation of the long press?
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Apr 26, 2010
For a new update I am changing the start-up work flow for the application. Part of this is setting the "android.intent.category.LAUNCHER" from one activity to another in my manifest. When I run an update from what is on the market to what I download from my website the application starts in the Activity where it used to start before the update. When I un install the application and install it from the same package I got from my website it starts in the Activity where I have now specified it to start. Shorter version: Update fails to update launching activity, un install- reinstall does update the launching activity. Is this a known issue? Do I really need to add logic to correct for people who update the app instead of installing fresh? Asking people to un install for an update is not a viable option. Is there something I can do to clean out whatever is getting saved that is causing the app to launch with the incorrect Activity? You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To un subscribe from this group, send email to android-developers+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en.
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Apr 7, 2010
I have Activity with ListView inside it and in the onCreate method of the Activity I have code for populating the Data of the ListView this Data is a server based and so populating includes calling Network URLs. I have the ArrayAdapter of the ListView in the Same Activity Class.
Now the Issue I'am facing is that, in Rest all scenarios my Activity is behaving in a proper way but when the Orientation [ Portrait to Landscaped or other way round] is taking place the Data is Getting lost and Newer Data calls are Required to Populate the Same Old Data now this is something that is not intended out the code how should I deal with it.
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Oct 8, 2009
I know we can write the own lauch APP to replace the traditional Lauch and then we can do everything we want.But now I don't want to do this job and just want to do some simple modifying in the traditional home screen. The "wall paper" is easily to update. However, I can NOT find the the way to update, "Menu" key's background or the Launch screen's background (which contains all the APPs buttons and now it is black) and the other things.
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Dec 1, 2010
The screen brightness on my epic will jump from 0% to 75%. I have auto brightness off and the power control widget is not on any of my screens. Does anyone know what is causing this and how I can fix it?
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