I have just created a new android project in eclipse and added a relative layout.
I can add controls using XML but I can't add any controls using the graphic editor.
My current code is:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
When I click on a widget - say a button, a black circle with a diagonal bar in it shows briefly then disappears, and I cannot drag the control onto the editor.
If I create the control in code, it shows up ok, but I can't select it with a left click, only right click. Then once selected it cannot be moved, and moving the handles does not resize the control. It can only be be deleted.
Any clues as to why this might be?
I'm using version 4.2.2
I don't knoiw what else to include that might be of assistance.
Related
After trying just about everything, I cannot get the color preview to show in the XML editor in Android Studio. In my colors.xml file, I expect a line like <color name="colorAccent">#1AD270</color> to show a small square to the left of it in the gutter previewing the color.
Weirdly, it only happens in this particular project. When I open other Android Studio projects, the gutter icons appear normally.
I have completely reset my Android Studio settings, disabled/enabled gutter icons and changed the gutter background, none of which worked. Any help?
Turns out that the color previews do not show up if you don't have an activity in your project. After adding the first activity, the color preview icons suddenly appear. Weird!
Just to expand on zwh's comment, you bizarrely need to have a layout xml in the layout folder of the module.
It doesn't need to be linked to an activity at all, or mentioned anywhere, just has to exist! I created one called dummy_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<!-- If this file is deleted, colors.xml doesn't show colour gutter icons https://stackoverflow.com/a/65395717/608312 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" />
I am participating in the Udacity Android Basics degree. I am struggling with the project explained below. I am yet using only basic knowledge so please do not be surprised by the code simplicity. :)) I am eager to understand how to position elements so that they appear in every phone orientation mode using RelativeLayout.
You can find the XML here.
There are two screenshots of the app displayed in portrait and auto-rotate. The portrait looks alright but in auto-rotate half of the information displayed disappears.
My second question is related to the clickable elements. Once, I made them clickable they turned into red and underlined. Is this common or I should offset this with another statement?
This is my GitHub project.
Any help is appreciated.
Thanks,
Iva
For Your First Issue of Portrait and Landscape Try to put your view contents in a scrollview so that the screen contents will be scrollable when the height of the view is more than the screen height (In Portrait and Landscape Modes)
Sample with your code
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.android.helloandroid.MainActivity"
android:background="#03B3E4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
Add Your Contents Here ...
</LinearLayout>
</ScrollView>
For the Second question
Textviews with android:autoLink="" always takes the color from your colorAccent in styles.xml in your project if it has text that can be linked like website or mobile or map
you can change the text color by adding android:textColorLink="yourcolorhere"
to your textviews
Thanks
For auto-rotation, you can either lock rotation for your app locking screen rotation. You can use any of the methods suggested by other developers.
But If you want to add landscape orientation to your app, then you will have to define a separate XML layout file for it. You can do so by Creating a
layout-landdirectory by right clicking layout under res and putting the landscape version of your layout XML file in that directory. You can also refer to this answer for some help handle screen rotation without losing data in android
Coming to the second part of your question, if you make an element clickable, it is not supposed to turn red and underlined. I am not sure how you are making them clickable but to make an element perform a function on Click, just declare the element and define it. Then you can set an OnClick listener to it. You can see an example here making a button clickable. Youcan also try this code to make the button clickable:
Button btn= (Button) findViewById(R.id.button_main);
btn.setClickable(true);
I have installed all sdk and correctly installed but I have tried multiple times but I cannot fine frame of app where I can insert tool,widgets, button, etc. (Cannot add anything on workspace)
My Android studio window image: https://drive.google.com/file/d/0B8AWJ5JO_e0xVV9KVEE0TUpMYWc/view?usp=drivesdk
Select devices，sdk and theme，like this
image： https://drive.google.com/open?id=0B7VdJKtF9NwGNVFKeE5zZ2pxVHM
Looks like you've gotten rid of the Component Tree.
Try go to the Text-tab and paste
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
or whatever root layout you need...
I tried to write a test demo for Google Map V2 in Android Studio. I followed every step from Androidhive Google Map V2 or better I think I need.
I'm using the same layout_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
but I'm getting always the same rendering problem:
Rendering Problems
A <fragment> tag allows a layout file to dynamically include different layouts at runtime. At layout editing time the specific layout to be used is not known. You can choose which layout you would like previewed while editing the layout...
I have absolutely no idea what's the problem. Did I forget something?
I just need to add Google services in the build.gradle like
compile 'com.google.android.gms:play-services:4.4.52'
I copied the manifest from the demo and changed the API Key.
The accepted answer is not wrong but it does not help.
As Dan wrote, Android Studio (also Version 1.0) will not display the map.
Maps needs an API key and dynamic processed code, maybe some day we will have that but so far not.
I've a 5 minute solution for those who want to see their app properly in layout preview:
To properly develop I still needed something else than a blank background.
I added overlays and buttons on top of the map, I really needed to see the map while placing elements over it.
The solution is simple:
1. Make a screenshot of your app with the map running (Power + Volume Down)
2. Download the screenshot and use an image editor to remove the top and bottom UI elements, so you will end up with only the map itself as an image.
3. Import that image into android studio drawables
4. create a new layout, name it dummy_mapviewfragment, put only a linearlayout and an imageview in
5. make the imageview "fill" the parent, and set "src" to the cropped image you just imported
6. back to your layout, add this into your Mapview Fragment xml :
tools:layout="#layout/dummy_mapviewfragment"/>
That's it, now you will have a non-interactive mapview fragment which displays a real map.
Your app will look like it looks on your mobile phone.
If you made errors in your image cropping you can "fix" it by setting the image scale to "centerCrop" so it will properly stretch out.
Update: You can get a screenshot without need to crop directly from within Androidstudio! Makes it a bit more convenient ;)
Rendering Problems
A tag <fragment> allows a layout file to dynamically include different layouts at runtime. At layout editing time the specific layout to be used is not known. You can choose which layout you would like previewed while editing the layout...
This is just the preview window telling you that it can't display a preview for the <Fragment.../> tag, because it doesn't know what kind of fragment you're going to put in it. You can safely ignore that message - your actual app will render the fragment fine when you run it (as long as you code it up correctly!).
Android Studio automatically offers a solution within the error description, which is adding the name of the fragment layout.
tools:layout="#layout/fragment_my"
Add a dummy layout "#android:layout/simple_gallery_item" as:
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="317dp"
android:layout_height="385dp"
android:id="#+id/map"
tools:context="com.example.XYZ.googlemaps.MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment"
tools:layout="#android:layout/simple_gallery_item"/>
I have a layout menu which contains this:
<RelativeLayout android:id="#+id/computersMenu"
android:layout_width="50dp"
android:layout_height="50dp">
<include layout="#layout/component_add_button"
android:id="#+id/imagebutton_add_client"/>
</RelativeLayout>
component_add_button.xml:
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/ic_menu_add"
android:layout_width="50dp"
android:layout_height="50dp"
android:scaleType="center"/>
Looking at the preview (EDIT: I mean the "Graphical Layout" tab of the xml editor in eclipse which uses the same rendering engine as all devices AFAIK) of component_add_button.xml you can see the image. Great. On the page which is including it it isn't displaying (although it does give you a selectable space where the image should be).
This seems like a really simple example that "should just work". The include tag has always seemed really flaky to me - I'm wondering if I'm missing something in terms of how it actually works...?
As your answer states, the eclipse preview does not display included layouts.
The simplest way to avoid doubt or mistakes in markup when "including" layout's is to design in the original layout then right click the view you wish to extract and select Extract include... from the menu
On a device this functionality worked fine. This seems like a bug in the "Graphical Layout" tab of the layout xml editor shipped with android-sdk.