I have this ImageView
<ImageView
android:id="#+id/img_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="#drawable/my_img_1" />
It is the child of a RelativeLayout. I am expecting the image to appear flushed with the upper-left corner of the page/parent. But it's not. There is about 20dp margin/padding between the parent's left and top and the child view. How do I get what I want?
What you expect is what should happen.
It sounds like the holding RelativeLayout has 20dp padding on it - this would lead to the behaviour you describe.
Make sure you've removed the padding from your parent RelativeLayout!
Related
I have guideline 60% from top and LinearLayout with bottom constrain to that guideline (so my LinearLayout will 60% of screen). Now Im need to put half of CardView to the bottom of that LinearLayout (screenshot added).
CardView height is wrap_content, cause will be added dynamically so I dont know height and cannot use something like margin bottom -50dp.
Thats what I have:
I need something like that:
I cannot find future like constrain by center. Could you help me, please.
You just need to set the top anchor of cardview to be connected to the bottom anchor of the linear layout (or to the guideline), and do the same for the bottom anchor. With both top and bottom anchors pointing to the same target, the cardview will be centered vertically on that target. Also, you might not need that linearlayout, depending on what you do. Check the chains functionality in ConstraintLayout.
<android.support.v7.widget.CardView
android:layout_width="300dp"
android:layout_height="200dp"
tools:layout_editor_absoluteX="28dp"
app:layout_constraintBottom_toTopOf="#+id/guideline"
app:layout_constraintTop_toTopOf="#+id/guideline"
tools:layout_editor_absoluteY="156dp" />
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/guideline"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.5" />
The eaiest way is to do this in code at runtime. Wait until the height has been calculated, then add a top margin of -.5*height.
When I use Android:margin to position textView half-outside it's parent, it acts weirdly: changes it's own size and text is moving inside textView box. How do I prevent it?
On image: left textView has cropped text at the end, and I don't want that.
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="16dp"
android:clipChildren="false">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:ellipsize="none"
android:singleLine="true"
android:textColor="#FFFFFF"
android:textSize="22.5dp"
android:layout_marginRight="200dp"
tools:text="0 TEXT VIEWVIEW"
tools:textColor="#000000" />
<...>
</FrameLayout>
FrameLayout always overlaps its Children. For effective placing widgets I suggest to use,
LinearLayout with layout_weight
arrange widgets relative to another widget by using RelativeLayout
You have two problems here:
You are using a FrameLayout. This means that when you keep increasing the margin of child, the view is gonna move out of the parent. Why? Because that's how FrameLayout is designed. Read documentation here: http://developer.android.com/reference/android/widget/FrameLayout.html
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other.
So instead you could use RelativeLayout or LinearLayout.
The second problem you have is android:singleLine="true". This means that as the text increases in length, it will still be shown in a single line and hence the text will be clipped. So set this to false, or just remove this attribute.
android:singleLine="false"
i think you need to change the line:
android:singleLine="true"
to false.
So the initial layout consists of a large circular "parent" button and multiple circular "child" buttons that are centered behind the parent button. So all the child buttons share the same center as the parent button. The reason for this layout is so during runtime, I can move the child buttons in and out of the parent button using translateX and translateY.
However, I'm stuck on the initial layout. How can I center the child buttons to the center of the parent button without hardcoding any child attributes?
Make the views the same size and add padding to the children so they get reduced. If the views are all in the same position the layout will look as you wish. Anyways, you can always change the properties in code.
I solved this myself using a container RelativeLayout as an anchor, with the parent button and all child buttons given android:layout_centerInParent. Then, to solve the issue of the child buttons disappearing when leaving the container, I gave the container android:clipChildren(false) and also set clipChildren to false on all of its ancestors as well.
Note that the container has to be bigger than all of its child elements, or all the child elements will be clipped to the same dimensions, even when they move outside of the container! To solve this, I gave the container a width and height of wrap_content.
Thus, all my child buttons were centered in the parent button no matter where I positioned the parent, and the child buttons were free to move around as well.
EDIT
A major flaw in this is that buttons can't recieve touch events if they are outside of their parent. To fix this, you can either use event coordinates or make the parent container big enough to always encompass the child elements (maybe twice the screen width/height?)
Here is the code:
res/layout/listfragment.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false" >
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<RelativeLayout
android:onClick="onButterflyMenuClicked"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_marginBottom="20sp"
android:layout_marginRight="15sp"
android:clipChildren="false" >
<Button
android:id="#+id/btn_north_1"
style="#style/PeekabooButton"
android:text="1st"
android:translationY="-65sp" />
<Button
android:id="#+id/btn_north_2"
style="#style/PeekabooButton"
android:text="2nd"
android:translationY="-115sp" />
<Button
android:id="#+id/kingbutton"
android:layout_width="65sp"
android:layout_height="65sp"
android:layout_centerInParent="true"
android:gravity="center_vertical|center_horizontal"
android:textSize="16sp"
android:text="KING" />
</RelativeLayout>
</FrameLayout>
res/values/styles.xml
<style name="PeekabooButton">
<item name="android:layout_width">45sp</item>
<item name="android:layout_height">45sp</item>
<item name="android:layout_centerInParent">true</item>
<item name="android:textSize">10sp</item>
</style>
Use android:gravity="center" on all views after putting them all inside a FrameLayout (possibly nesting the FrameLayout inside another layout). You can then offset each Button's position in its parent by changing the layout_margin* values. Or you could translate the parent FrameLayout that holds all the Buttons however you wish.
To make the button circular, change your button's android:background value to point to a custom selector.
My layout is the following:
<TextView
android:id="#+id/display_city"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/pollenType"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/get_pollen_index"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginTop="51dp"
android:textSize="40sp" />
As you can tell, Philadelphia, PA is left-aligned. No matter what I change, whether it's centering horizontal and vertical to true, it stays left-aligned.
I have tried changing the layout via the XML and graphical user interface. In the graphical user interface, it indeed is "centered", but it remains non-centered. My layout positions are consistent across all my textviews, so I am unsure as to why this particular TextView is not centered.
Two options...
One: Give the TextView android:layout_width="wrap_content"
Two: Keep the android:layout_width="match_parent" and use android:gravity="center_horizontal"
layout_gravity defines gravity of the view within its parent. Your textView already takes the full width because of match_parent, so centering it horizontally inside its parent does nothing.
gravity, on the other hand, defines the gravity of its contents.
You can center the text using the gravity xml attributes :
android:gravity="center"
Your width equals match_parent and therefore the edges of your TextView already touch the edges of the parent view. You should rather center the text in the TextView with android:gravity="center".
You're telling the display_city TextView to be as wide as the screen.
android:layout_width="match_parent"
However, its text is left aligned by default. That's why it looks this way.
You have two alternatives for what you want:
Keep the width as match_parent and center the text inside the TextView (with gravity).
Set the width to wrap_content and center the View inside its parent (with layout_gravity).
I am having a spot of bother with a fairly simple layout. Here it is:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/id1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:ellipsize="end"
android:maxLines="1"/>
<TextView
android:id="#+id/id2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"/>
</LinearLayout>
3 Questions:
How do I center vertical both TextViews (or perhaps better said, the text within those views) within the parent LinearLayout? The left view is vertically centered OK, but the right one (because it has a smaller font) is not. It seems to be centered vertically at the top. I obviously tried playing with layout_gravity of the second view but that makes no difference whatsoever. The only way I can solve it is to wrap the second TextView in a LinearLayout with its layout height parameter set to match_parent (but is this the correct way of doing this?)
Similarly, I want the View on the left horizontally centered on the left, and the View on the right horizontally centered on the right. Currently the right View is placed immediatly next to the left one. The only way I can solve this is by adding something like this inbetween the two text views:
<TextView
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="">
basically acting as a spacer which decreases in size depending on the legth of the text in both TextViews
I want the text in the left View to be truncated if the combined text of the Views does not fit horizontally. No wrapping onto a new line. Currently the text in the left View simply "pushes" the right one out of the parent. No idea how to achieve that (apart from adding android:maxLines="1" to stop the text from wrapping). I have tried android:ellipsize="end" but that does not seem to have any effect.
Best way is to use Relative layout , but still if you want to do the same thing in Linear layout than do some changes in your xml file
-First is set Linear layout hight as match parent :
<LinearLayout android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="horizonatal">
-Second for making the views visible at centre vertical do
android:layout_gravity="center_vertical"
same property android:layout_gravity = "center_horizontal" , you have to add in second text view also.
It will make your both text view appear at centre vertical but one next to other.
To make the second view appear on right I think you can add
android:layout_marginLeft="xx dp"
put some value in place of xx.
For your third question about truncating your text, you should give some size to your TextView not wrap content..Like android:layout_width ="25dp"
and then use android:ellipsize="end".
I guess you will get that..Actually I am in hurry,time to leave the office.