Develop Reference

How to open application to run code without showing activity

I want when the user click on my application (when he open my application) the application run java without open the application or showing any activity.
Like Fast Task killer application.
And thanks.

Create transparent activity for this
Here’s a complete file:
res/values/styles.xml
<resources>
<style name="Theme.Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
</resources>
Then apply the style to your activity, for example:
<activity android:name=".SampleActivity" android:theme="#style/Theme.Transparent">
...
</activity>

How to stop Facebook SDK Dialog using white textcolor even if my theme needs white text

As much as I learn, I still have a long way to go ...
I'm trying to use Facebook SDK to provide details for a sign up.
I am using a blue, yellow and white theme for my app; the text being white. My style setup is:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#android:color/holo_orange_light</item>
<item name="android:colorBackground">#color/colorMainBackground</item>
<!--<item name="android:actionBarStyle">#style/ThemeActionBar</item>-->
<!--<item name="android:windowActionBarOverlay">true</item>-->
<item name="android:textColor">#android:color/white</item>
<item name="android:textColorLink">#android:color/holo_orange_light</item>
<!-- Support library compatibility -->
<!--<item name="actionBarStyle">#style/ThemeActionBar</item>-->
<!--<item name="windowActionBarOverlay">true</item>-->
<item name="android:textColorPrimary">#android:color/white</item>
<item name="android:titleTextColor">#color/yellow</item>
<item name="android:textColorPrimaryInverse">#android:color/black</item>
<item name="android:navigationBarColor">?android:attr/statusBarColor</item>
<item name="android:textColorSecondary">#android:color/white</item>
</style>
However, when Facebook shows a dialog box, all I get is a white square:
It would appear that Facebook are using my textcolor and hence the white box. Is there a way I can override this? Or have Facebook use the default colour scheme (if there is one).
This is somewhat frustrating me now.
My Manifest entry for Facebook is:
<activity
android:name="com.facebook.FacebookActivity"
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
android:label="#string/app_name" />
Thanks in advance

Facing the same issue. It seems FacebookActivity picks up the color from the style you declared in the application tag.
<application
...
android:theme="#style/AppTheme'>
You see it white because in styles.xml you have the accent color to white. for your theme.
<item name="colorAccent">#FFF</item>
Since in my application I need the colorAccent to be another color, I chose to have two AppThemes. One for my activities with whatever colorAccent I need and one for the application that will get used by Facebook.
I tried to add a theme to com.facebook.FacebookActivity but it gets ignored. Something to do with ManifestMerging.

Changing the color of an Action Bar

<style name="Theme_Base_App" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
I simply copied the above code to my styles.xml file and I copied
android:theme="#style/Theme_Base_App"
into my manifest file. How do I now change the color of this action bar?
Also, can someone explain me what exactly I am doing by using these lines of code? What is the manifest file for? And what am I doing in the Styles.xml file?

To change your color just set the colorPrimary in your colors.xml file.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="primary">your color</color>
</resources>
Using this style you are defining your custom theme inheriting from AppCompat theme.
<!-- inherit from the material theme -->
<style name="Theme_Base_App" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Main theme colors -->
<!-- your app branding color for the app bar -->
<item name="colorPrimary">#color/colorPrimary</item>
<!-- darker variant for the status bar and contextual app bars -->
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
</style>
You can refer this link for more info.
The Android Manifest file presents essential information about your app to the Android system. With
android:theme
you are defining a reference to a style resource defining a default theme for all activities in the application. Individual activities can override the default by setting their own theme attributes. For more information, see the Styles and Themes developer guide.
Here you can find more info about Manifest and application element in the Manifest.

How to remove the menu from an action bar (java)

I'm new to android development and wanted to make a tabbed application, so I started with google's file form the documentation and I would like to remove the most above part of the action bar (where the logo and the app name stands). I've tried styling it like this:
<resources>
<style name="ThemeHoloWithActionBar" parent="android:Theme.Holo.Light.DarkActionBar">
<item name="android:actionBarTabStyle">#style/ActionBarTabStyle</item>
<item name="android:actionBarSize">50dip</item>
</style>
<style name="ActionBarTabStyle" parent="#android:style/Widget.Holo.ActionBar.TabView">
<item name="android:minHeight">50dip</item>
</style>
hoping that it would push the size of the other bar to 0 but it didn't work.
Edit:
when using:
<item name="android:windowNoTitle">true</item>
<item name="android:windowActionBar">false</item>
I Can't get the error formatted correctly so I uploaded an image :
http://i.imgur.com/ED7InpD.jpg

If you don’t need the action bar, you can remove it from your entire app or from individual activities. This is appropriate for apps that never used the options menu or for apps in which the action bar doesn’t meet design needs (such as games). You can remove the action bar using a theme such as Theme.Holo.NoActionBar or Theme.DeviceDefault.NoActionBar.
in style.xml add this:
<resources>
<style name="NoActionBar" parent="#android:style/Theme.Holo.NoActionBar">
<!-- Your style here -->
</style>
</resources>
in AndroidManifest.xml add this:
<!-- [...] -->
<application android:name="#style/NoActionBar"
<!-- [...] -->
or try with this:
<!-- [...] -->
<application android:theme="#style/NoActionBar">
<!-- [...] -->

To remove actionbar, you need add:
<item name="android:windowNoTitle">true</item>
<item name="windowActionBar">false</item>
to your AppTheme style file, after remove, then you can not use default actionbar to add tabs.
If you still want to use tabs, then you have to use SlidingTabLayout to make a custom ViewPager title strip. There is Android sample project SlidingTabsBasic, which show detail how to make custom tabs.

Android Preference Screen Layout

I have the following preference screen in my app
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference
android:key="edittexvalue"
android:id="#+id/edittextvalue"
android:title="Title Here"
android:summary="Summary Here"
android:defaultValue="Some Value"/>
<Preference
android:key="customPref"
android:title="Title Here"
android:summary="Summary Here"/>
</PreferenceScreen>
All of that works just fine however my app i have custom backgrounds and text colors/sizes but i can't figure out how to format the PreferenceScreen I assume you point this at another xml? but can't figure out the code i need and what changes should be made. The main concern is the background color the text is fine i guess but the background just doesn't match the rest of my app. So i'd like to set a custom background color lets say red for now (#ff0000)
I thank anyone that can help me with this problem

You can to apply a theme to it in your manifest, for example
<activity android:name=".Settings"
android:theme="#style/YourStyle"/>
and in your styles.xml (if you dont have one, create it in the values folder)
you can modify whatever you need
For example
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="YourStyle" parent="android:Theme.Light">
<item name="android:listViewStyle">#style/Widget.ListView</item>
<item name="android:windowNoTitle">true</item>
</style>
<style name="Widget" parent="android:Widget">
</style>
<style name="Widget.ListView">
<item name="android:background">#color/white</item>
<item name="android:divider">#color/gray_division</item>
<item name="android:dividerHeight">2dip</item>
</style>
</resources>
I hope this helps