Develop Reference

How to fit imageView inside LinearLayout in android, but always keep its aspect ration

I am trying to make an ecommerce app, the biggest problem i face is fitting the images when i get it from an api call. The images can be in any size, so i need to make sure they fit perfectly in all screen sizes.
This is my cart xml listview item layout:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#color/primary">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="0.2">
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
android:background="#drawable/temp_image_product_detail"
android:id="#+id/layout_sort_by_listview_icon"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:layout_weight="0.8">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="adkfj;aklsjdf"
android:textSize="25sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rs. 255"
android:textSize="25sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4.2"
android:textSize="15sp"/>
</LinearLayout>
I want to achieve the perfect fitting look for the cart page and the product listing page. Something like this shown in:
http://traverphillips.com/Amazon-Material-Design

I hope it will help i didn't tested it though :
your first LinearLayout should look like this
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#color/primary">
<LinearLayout
android:layout_width="200dp"
android:layout_height="200dp"
android:gravity="center"
android:layout_weight="0.2">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/temp_image_product_detail"
android:id="#+id/layout_sort_by_listview_icon"/>

if you want the image to be fit horizontaly you can set layout_width to fill_parent and layout_height to wrap_content but you must set adjustViewBount "true"

Please use android:scaleType="fitXY" for fit in screen

Try layout_width="match_parent" and use layout_weight

Android textview not fit for all the screen

i developed one of application and now am facing problem that it show perfectly in my nexus7 but when i viewing other device screens the text view not fitting
i want all the screen as same as nexus7. its anyone can know the better solution for this please. unfortunately i don't have enough reputation so i cant post any screenshot here this my xml code
<?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"
android:layout_gravity="center"
android:background="#color/white">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:paddingBottom="16dp"
android:paddingLeft="64dp"
android:paddingRight="64dp"
android:paddingTop="16dp" >
<ImageView
android:id="#+id/pointer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_centerInParent="true"
android:src="#drawable/point" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:paddingBottom="16dp"
android:paddingLeft="64dp"
android:paddingRight="64dp"
android:paddingTop="16dp" >
<TextView
android:id="#+id/name2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="97dp"
android:text="#string/numberusers"
android:textColor="#color/no_users"
android:textSize="30sp"
android:textStyle="bold" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="19dp"
android:text="#string/number"
android:textColor="#color/no_users"
android:textSize="30sp"
android:textStyle="bold" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="16dp"
android:paddingLeft="64dp"
android:paddingRight="64dp"
android:paddingTop="355dp" >
<ListView
android:id="#android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:clickable="false" >
</ListView>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>

I m Not Sure But Remove Relative Layout And Use Linear Layout Its More Better Than Relative

The two textViews that you have in your layout use android:layout_width="wrap_content".
Use android:layout_width="match_parent" in the one you want to fill the screen.

every children relative layout in your xml has height and width as match_parent. Do you need it? Because if first layout have height as match_arent than it will not leave space for others. Try using "wrap_content" as height for inner relative layouts.

If I got your question, you have to set the width of the textview as
android:layout_width="match_parent"
But in my opinion, the hole screen is wrong. Use a LinearLayout (vertical or horizontal) and place there your first two textviews. And if you want more accuracy use the gravity feature in each text view and of course set a layout_weight for each TextView and weightSum in the LinearLayout.

Button completely disappears when placed below gridview despite numerous configurations

I have a view in which i'd like a button to be placed below a grid view and fill up the remaining space. The view is a relative layout, and no matter what attributes I give it, if I some how relate the button to the grid view, it disappears. It only appears if I place it in the relative view with it aligned parent bottom, but then it doesn't stretch. The solution I thought would be most likely, though it didn't work either, was to place the button in the relative view, alignParentBottom=True and then layout_below="id/gridview" (all that is psuedo code). This is my code right now:
<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"
android:background="#drawable/pin_fragment_background"
tools:context="com.lab125.viva_app.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="#+id/audioPIN_marquee"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="15dp"
android:paddingBottom="30dip"
android:gravity="center"
android:textSize="15sp"
android:textStyle="bold"
/>
<LinearLayout
android:id="#+id/keypad_wrapper"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_below="#id/audioPIN_marquee">
<GridView
android:id="#+id/keypad"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="5dip"
android:verticalSpacing="5dip"
android:numColumns="3"
android:stretchMode="columnWidth" />
<Button
android:id="#+id/start_ver_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="15sp"
android:textStyle="bold"
android:text="#string/Start_Ver_Button"
android:background="#drawable/button_style" />
</LinearLayout>
<Button
android:id="#+id/audio_playback_btn"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/keypad_wrapper"
android:text="play"
android:textSize="15sp">
</Button>
</RelativeLayout>
Again, with this code, the button does not show at all.
Edit: #Dave's suggestion was correct, and I could see the button after setting the orientation to vertical. However, the only reason I had placed the gridView in a linear layout in the first place was in attempt to just not have the button disappear when having its android:layout_below property to the gridView (by setting its android:layout_below to something else). The more accurate fix for what I wanted to do however, was to not have the gridView's width and height set to match_parent, which was the root cause behind why the button was disappearing. So, i set the gridView's height to wrap content, but that caused the grid to shrink to the point where each grid element's content was no longer visible. I found that the cause of that was => I was programmatically setting the width and height of the gridview to wrap its content, and then the width and height of the components inside by the width and height of the parent view. Realized that was quite cyclical which may be why the gridview was shrinking when I set it to wrap content. I then set the width and height of the grid Elements based on the dimensions of the screen, which fixed the size of the gridView. So everything pretty much works now.
Here is my new layout, if anyone is interested.
<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:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#drawable/pin_fragment_background"
tools:context="com.lab125.viva_app.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="#+id/audioPIN_marquee"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginBottom="20dp"
android:paddingTop="15dp"
android:gravity="center"
android:textSize="15sp"
android:textStyle="bold"
/>
<GridView
android:id="#+id/keypad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/audioPIN_marquee"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="5dip"
android:verticalSpacing="5dip"
android:numColumns="3"
android:stretchMode="columnWidth" />
<Button
android:id="#+id/start_ver_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/keypad"
android:layout_alignParentBottom="true"
android:layout_marginTop="20dp"
android:textSize="15sp"
android:textStyle="bold"
android:text="#string/Start_Ver_Button"
android:background="#drawable/button_style" />
<!--
<Button
android:id="#+id/audio_playback_btn"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/keypad_wrapper"
android:text="play"
android:textSize="15sp">
</Button> -->
</RelativeLayout>

start_ver_btn won't show because the gridview has match_parent for both width and height, judging by your layout_width and heights, I think you want to set the LinearLayout's orientation to vertical.

Reduce spacing GridView

I'm try to create a GridView where the values are as close as possible to each other.
Now the content is spread out all over the screen.
How can I reduce the spacing between the cells of the GridView?
Using the setVerticalSpacing() method didn't work.
<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=".LevelSpelen" >
<GridView
android:id="#+id/gridView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignLeft="#+id/textView1">
</GridView>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="#+id/gridView1"
android:layout_marginLeft="18dp"
android:text="" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginLeft="78dp"
android:layout_toRightOf="#+id/textView1"
android:text="Button" />
</RelativeLayout>
Any suggestions?

The spacing is defined in 2 ways: the spacing between cells, and the spacing within a cell
In your GridView definitions add
android:verticalSpacing="8dp"
android:horizontalSpacing="8dp"
or smaller and add android:numColumns="auto_fit" to make sure that you can fit as many items as possible in each row.
In the GridView Item layout, make sure that you make the cell as small or as big as you want

Grid view overlapping other views android

I need to have a button, a grid view and a button, arranged vertically. I can see the Button and the GridView but can't see the button declared after the grid view. Why's that? This happens with any view below the grid view declaration.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/text_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_marginTop="20dip"
android:text="Fragment1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="30dip" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1"/>
<GridView
android:id="#+id/gridview"
android:layout_width="wrap_content"
android:layout_height="match_parent"overla
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1"/>
</LinearLayout>

As you have taken LinearLayout with vertical orientation, give wrap_content to the height of GridView.
Now, if you want last button at below to the screen, then include android:layout_weight="1" in GridView.

try this
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button1"/>
<Button
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Button1"/>

as you have declared height of gridview as match_parent it should overlap the views declared below it if it can not find enough screen space available to show it.
You should try calling bringtoFront() method on the view declared below gridview.
Other thing from my viewpoint is to try relativeLayout if possible and use android:layout_above and android:layout_below with gridview.