Develop Reference

ImageView inside recyclerView width and height layout

I have a chat application like whatsapp. I want to show several images that i have in the internal storage. So the only thing that i know for that image is the path that i can find it.
However, in the xml layout of the image_item i must set the width and height of the imageView.
<ImageView
android:id="#+id/rcvImage"
android:layout_width="280dp"
android:layout_height="280dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="32dp"
android:adjustViewBounds="true"
android:maxWidth="320dp"
android:maxHeight="320dp"
android:minWidth="150dp"
android:minHeight="150dp"
android:scaleType="centerCrop"
android:src="#drawable/default_img"
tools:ignore="ContentDescription" />
How can i set the values so i can have portrait and landscape images, but without making lags in the recyclerview scrolling

You can set wrap_content and also adjustViewBounds
<ImageView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/test"/>
Also, scaleType can help with the image resize
android:scaleType="fitStart"
https://developer.android.com/reference/android/widget/ImageView.ScaleType

ImageView to fit height, auto scale width, keep aspect ratio

I have a layout like this:
<LinearLayout
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_marginEnd="8dp"
android:gravity="start|center_vertical"
android:orientation="horizontal"
android:layout_weight="0.25">
<ImageView
android:layout_width="wrap_content"
android:layout_height="20dp"
android:background="#drawable/reply_icon"
android:scaleType="fitCenter"
android:adjustViewBounds="true"
/>
</LinearLayout>
I'm trying to get the ImageView to fit its height (20dp) and auto-adjust the width (while keeping its aspect ratio), however, it comes out looking stretched like this:
How can I fix this?

Add two attributes: (android:adjustViewBounds and android:scaleType=) to your ImageView for keep aspect ratio
android:adjustViewBounds="true"
android:scaleType="centerCrop"
Hope this help

stop image from resizing itself

I have an image that seems to change its size depending on the parents height, well the parent/parents height. Point is I do not want the image to change size. Is there some way to stop it from thinking for itself?
<ImageView
android:id="#+id/ivSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:src="#drawable/img_save"
android:layout_gravity="left"
android:contentDescription="#string/ivSave" />

wrap_content means that the view will resize automatically. To set a fixed size use:
android:layout_width="100dp" and android:layout_height="100dp"
Use 'dp' instead of 'px', because these are device-independent.

try
android:scaleType="centerInside"
<ImageView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="#drawable/img_save"
android:scaleType="centerInside">
</ImageView>
click here for more image scale type

Re sizing an image in imageView

I want to define maxHeight for an image that it's adjustViewBounds has been set to true.
in this way adt automatically keeps aspect ratio.
is there any way to gain this approach without keeping aspect ratio?
this is the image, and i want to stretch it from sides, without being displaced:

You can do like this
<ImageView
android:layout_width="100dp"
android:layout_height="400dp"
android:src="#drawable/ic_launcher"
android:scaleType="fitXY"/>

try this
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="#drawable/your image name"
android:scaleType="fitXY"/>

I think android:scaleType="fitXY" is what you are looking for.

android resize image

I have added image in android, but it is fitting to middle of the screen, what can I do to set it for full screen?
what is wrap_content and fill parent, I'm not getting how to do this.
This is my code
<ImageView
android:scaleType="fitCenter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/my_image" android:cropToPadding="false"/>

Try this
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="center"
wrap_content says ImageView to fit image dimension and fill_parent to fit dimension of father layout.

Look for scaleType
<ImageView android:scaleType="fitCenter" />

You may try:
android:scaleType="fitXY"
Read more about ScaleType.