I'm a noob who has a book on Android programming that is using an older version of Android Studio. I have Android Studio 3.3. I want to learn on the latest Android Studio, but the steps to naming an activity are completely bypassed in AS v3.3. The book names the activity beer activity, so I thought I would just rename main activity to beer activity. Error things going red, arghh...
I think I figured out how to rename things in the coding and I got rid of a lot of red, but it crashed when compiling. Then I renamed the main activity in my manifest. Now it runs with title, but won't display text says hard-coding no good. I still get a little lightbulb that complains about resources, and I think I still need to change something somewhere.
Here is the XML code that was named main something, I think. I forgot. Is this code not usable anymore in 3.3? I ran into deprecated things several times. I thought I was buying an up-to-date book copyright November 2018, but Android Studio 3.3 just came out recently, the stable version I think.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:orientation="vertical"
tools:context="com.hfad.beeradvisor.FindBeerActivity"> (changed name here)
<TextureView
android:id="#+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is text view" (wont display)
/>
</LinearLayout>
Related
Can anybody how to remove this parent NavDrawer overlay showing whilst designing layout? (Screen 1).
The overlay is removed when running in actual device (Screen 2).
Because of this I can't design child elements right there in the studio.
Any help would be great!
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="visible">
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Always Visible."
/>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
When you see that gray block with the tag name in it, that means that Android Studio can't resolve the class from the tag in your layout, so it doesn't know what to preview. Often this will happen if you have a typo in your layout file, but then you wouldn't see it working when you actually run the app.
For me, I can make this happen quite easily by using the old support library versions of widgets, since I have AndroidX enabled in my project. For example, just pasting your code in to my IDE gives me the same gray box, but changing your tags to use AndroidX fixes it (android.support.v4.widget.DrawerLayout -> androidx.drawerlayout.widget.DrawerLayout).
Chances are good that your Android Studio just needs a kick in the pants.
I suggest doing a Gradle Sync (File -> Sync Project with Gradle Files) and, if that doesn't work, an Invalidate + Restart (File -> Invalidate Caches / Restart...).
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context="com.bignerdranch.android.geoquiz.CheatActivity">
<TextView
android:id="#+id/answer_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp"
tools:text="Answer"/>
I am a novice in programming. I started with Big Nerd Ranch programming book. I came across this code. In the book it is stated as:
"This namespace allows you to override any attribute on a widget for the
purpose of displaying it differently in the Android Studio preview. Since TextView has a text attribute,
you can provide a literal dummy value for it to help you know what it will look like at runtime. The
value “Answer” will never show up in the real app. Handy!"
What does that actually mean? I am completely new. I know this is foolish question, please help me in this.
Thanks to that line
xmlns:tools="http://schemas.android.com/tools"
you can use in all your XML something like that
tools:text="Answer"
Thanks to that line
xmlns:android="http://schemas.android.com/apk/res/android"
you can use in all your XML element the android attribute, for example
android:id="#+id/answer_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp"
The book you're reading is a good book, keep continue and don't give up!
Tools is basically a collection of extra properties you can add to your TextView that assist you when designing layouts in Android Studio. In this particular example, tools:text allows you to put a fake value into your TextView which will only show up in the the layout preview in Android Studio.
This will allow you to see what a TextView looks like when designing your layout in Android Studio, but you don't have to worry about removing that dummy text from your layout when you build a "real" version of your app for a phone.
See also: Tools Attribute Reference
I am having issues viewing text in the graphical layout section of my android applications. This is consistently happening across many projects, new and old. See the link for visual example: http://i.imgur.com/OwENudf.jpg
The button in the image should say 'test' but instead its two boxes. Sometimes it appears as an open bracket, [
Background- I was having issues with eclipse/android sdk not creating the R.java file when a new project was created so I uninstalled the sdk and then reinstalled it. The R.java file builds fine now but the text in the graphic layouts is all strange characters.
Any idea what I can do to fix this?
The XML has one warning, which is 'Hardcoded string "test", should use #string resource"
I don't think this is the issue because I have had this error before on working applications.
EDIT:
XML code-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="18dp"
android:text="test" />
</RelativeLayout>
I believe you are having font issues with your emulator. It can't find appropriate characters to display. You may need to reinstall that.
Ok so I searched and I think it will fix your problem (and it was too long to post it as a comment).
Go to the platforms folder where android-sdk is installed (C:\Program Files (x86)\Android\android-sdk\platforms).
Then go to the folders you're currenlty building your projects with then go to data/fonts (i.e C:\Program Files (x86)\Android\android-sdk\platforms\android-8\data\fonts) and take a look at the file fonts.xml. Also, may a ttf file disappeared when you updated your ADT (which seems odd).
You can find here an example. Read this carefully before trying to modify these files.
I hope this will solve your problem. If not, I have really no idea about what to do.
This is strange, yet I see it all the time as I have lots of reasons to display just a simple question mark in this app.
When editing with the Eclipse graphical layout editor, everything is fine...until I tell a TextEdit or a Button to display just a question mark. Here's my code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView
android:id="#+id/test_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/question_mark" />
</LinearLayout>
And the string is defined in res/values/strings.xml. The relevant line is:
<string name="question_mark">\u003f</string>
The error message I get is:
Missing styles. Is the correct theme chosen for this layout? Use the
Theme combo box above the layout to choose a different layout, or fix
the theme style references.
Couldn't find theme resource for the current theme
Change the text, and the error message goes away.
You can see that in my struggles, I'm even trying to use the unicode version of a question mark. And yes, \? doesn't work either.
Note that this only happens when the graphical layout editor is set to API 7 or greater.
Now the graphical layout editor displays the question mark properly, and the emulator and my phone display the question mark without any problems. I'm just annoyed with the error message taking up 1/4 of my screen for all my layouts (and obscuring other error messages that may crop up).
Any suggestions?
First, test this again on the ADT 21 release that shipped today.
If the problem continues, create a sample project that demonstrates the issue, and post it along with step-by-step instructions on the Android issue tracker.
Well, this is a really crappy hack, but it kind of works--if you stand on your head!
You can use the unicode \u00bf as in
<TextView
android:id="#+id/test_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="\u00bf" />
It's not a normal question mark, but it's close enough for a hack and gets that annoying error message out of your hair. And it might even increase the humor quotient of your app!
But PLEASE, if anyone out there has a real fix, post it!
Wow, I entered a bug report...[time marches on]...finally, I get a few emails as the Google team starts to look at it.
Today, I received some good news. It looks like the bug has been fixed (and they found a few related bugs, which have been fixed as well). The fix will be in the next release, Version 21.1 Preview 2. You can read the official details here.
Looking forward to it!
I'm working on a couple of apps at the moment while I try to learn my way around the Android SDK. I had a bit of trouble recently with my layouts where I was defining, for example, an EditText element as such...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText
android:id="#+id/price_per_pack"
android:layout_width="100dip"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="#id/price_per_pack"
android:layout_alignParentLeft="true"
android:textSize="12pt"
android:text="Price Per Pack"/>
</LinearLayout>
The application was compiling correctly, however when I attempted to start the activity which utilizes this layout nothing would happen. Through a process of elimination I identified the id attribute as the troublesome one and while playing about I discovered that changing
android:id="#+id/price_per_pack"
to
android:id="#+android:id/price_per_pack"
solved my problem and the application behaved as expected. My initial attempt at declaring the id attribute was based upon examples in the SDK documentation so I'm wondering if somebody could explain to me why I needed to make the above change to get it working?
I'm sure that it won't make any difference but I'm developing using the android-mode.el emacs plugin and have a completely up-to-date copy of the SDK.
Thanks in advance.
From Android Documentation:
With the android package namespace in place, we're now referencing an ID from the android.R resources class, rather than the local resources class.
It looks like you might have some syntax errors in your code posted.