I cannot delete the icon on toolbar - java

I am new to Android and I copied a sample code from web and build my app on that sample code. But I am trying to delete the image on the top toolbar. I cannot locate where the program puts that image.
here is the screen. I put a red mark on the toolbar I am talking about and I want to remove that smily face on that bar. but I dont want to delete the image, I want to find the code which puts that face there.


That will be located in your manifest file under the <application> tag. Here is an example:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
Now each of the ="#somewhere/name" is a pointer. The icon is under res/drawable, while the other two will be under res/values/


You can use the following code. You must add in the onCreate() method of your activty :
getActionBar().setDisplayShowHomeEnabled(false);

Related

Shows only black screen when moving to another activity

I don't know what I've done, but after I restart the Android Studio and when i run the app, it just shows only black screen when I'm calling new activity from previous activity.
The app is running good before I restarted the Android Studio.
I don't find where the wrong code is. There is no error based on the IDE.
I have this in onCreate
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
I have launched the activity by this code:
context.startActivity(new Intent(context, homeActivity.class));
in the previous class
I've seen many answers here, but do not solved my problem.
EDIT
Screenshot after calling the homeActivity

Follow CamelCase for naming conventions for Java classes check homeActivity.class --> HomeActivity.class
Ensure you define homeActivity.class in your manifest.xml
<application
android:allowBackup="true"
android:supportsRtl="true"
android:installLocation="auto"
tools:replace="android:supportsRtl"
android:icon="#mipmap/app_icon"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:theme="#style/AppTheme" >
// ... Other activity
<activity
android:name=".HomeActivity"
android:screenOrientation="portrait">
// ... Other meta-data & services.
</application>

Try create another activity with the same layout and class, but name it by the big letter.

Android dialog theme makes setContentView crash the application

I'm applying this theme from manifest :
<activity
android:name=".ui.rate.MyActivity"
android:theme="#android:style/Theme.Dialog">
</activity>
With this the application crash on setContentView() of MyActivity. If I remove it there is no crash but I need this theme
In the activity onCreate() i'm doing this :
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_rate);
getWindow().setBackgroundDrawableResource(android.R.color.transparent);
Even if I remove the first and third lines the applicatio ncrash the same way. It's really the dialog theme that's causing the crash
How can I set it so that Android accept it ?

You can use Theme.AppCompat.Dialog as the theme of your activity to avoid
compatibility problem.
The activity will be presented as a dialog.
<activity
android:name=".MainActivity"
android:theme="#style/Theme.AppCompat.Dialog">
</activity>
As for the title, you can use setTitle("Hola!"); to change it.
If you wanna remove the title, just call:
supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
for android:theme="#style/Theme.AppCompat.Dialog",
and:
requestWindowFeature(Window.FEATURE_NO_TITLE);
for android:theme="#android:style/Theme.Dialog".

how to make professional back button in action bar

I made back button by using activity parent and getactionsupport just like this:
<activity
android:name=".News_details"
android:parentActivityName=".Main2Activity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.package.Main2Activity" />
</activity>
I also add this to my activity in the manifest.
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
so what the result that I get ?
The blue arrow displays properly when I run my app in android version 4.+. When I use android version 5.+ the blue arrow reveres direction.

I can not hide Title bar

I use this code in manifest for hide title bar, but i cant run my application:
<activity
android:name="com.example.MainActivity"
android:theme="#android:style/Theme.NoTitleBar"
android:screenOrientation="portrait"
android:label="#string/app_name" >

Try using a physical device to test your app... Well I tried to hide the NoTitleBar but it became invisible instead!!
http://developer.android.com/tools/device.html

Change the look of android options menu

I would like to create android options menu (left button on android device) looking like this one:
but using onPrepareOptionsMenu creates the menu which looks like this one:
Could you please point me how to change the look of the menu? Is there anything I can set in menu XML to change it's look or maybe I should use: onPrepareContextMenu?
Thanks in advance for your reply.

Add
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
attribute to the <activity> tag in project's AndroidManifest.xml
<activity android:name="YourActivity"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
>

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