How to Center Crop a Background Image of Linear Layout

How to have a Fullscreen Background Image (with center-crop) that doesn't Resize

try this LayerDrawable (res/drawable/backlayer.xml):

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
>
    <item>
        <shape>
        <solid android:color="#f00" />
        </shape>
    </item>
<item>
        <bitmap
        android:gravity="top" android:src="@drawable/back1">
        </bitmap>
    </item>
</layer-list>

and set it to your top level layout: android:background="@drawable/backlayer"

UPDATE: try this BitmapDrawadle, set it to top level layout (setBackgroundDrawable()), if simpleMapping == true is good enough you can remove "else" branch:

class D extends BitmapDrawable {
    private Matrix mMatrix = new Matrix();
    private int moldHeight;

    public D(Resources res, Bitmap bitmap) {
        super(res, bitmap);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        if (bounds.height() > moldHeight) {
            moldHeight = bounds.height();
            Bitmap b = getBitmap();
            RectF src = new RectF(0, 0, b.getWidth(), b.getHeight());
            RectF dst;

            // if simpleMapping is good enough then remove "else" branch and
            // declare "dst" as:
            // RectF dst = new RectF(bounds);
            boolean simpleMapping = true;
            if (simpleMapping) {
                dst = new RectF(bounds);
            } else {
                float x = bounds.exactCenterX();
                dst = new RectF(x, 0, x, bounds.height());
                float scale = bounds.height() / src.height();
                float dx = scale * src.width() / 2;
                dst.inset(-dx, 0);
            }
            mMatrix.setRectToRect(src, dst, ScaleToFit.CENTER);
        }
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawColor(0xaa00ff00);
        canvas.drawBitmap(getBitmap(), mMatrix, null);
    }
}

Android Programming crop background image

There is BitmapDrawable, which allows to do it. First you need to create a drawable resource as follows (let it be a file in the project resources res/drawable/mybg.xml ):

<bitmap
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/background"
    android:gravity="center" />

And then specify it as a background resource in your layout:

<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:orientation="vertical"
    tools:context="overbit.user.MainActivity"
    android:background="@drawable/mybg">
</LinearLayout>

How to set the ScaleType on a LinearLayout's background image

View's background is stretched depending on the size of the View.

Image scaling is supported by ImageView, and to use it together with the LinearLayout you need an additional container, that will overlay the 2 children (e.g. a FrameLayout):

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/bgapp"
    android:scaleType="centerCrop"/>

  <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal">
    ...
  </LinearLayout>
</FrameLayout>

How to set LinearLayout background image to fill the screen

For this case you have a few drawable folders in which you need to keep images that corresponds to the respective device dimensions.
i.e.
HDPI - have a different resolution image
MDPI,XHDPI,XXHDPI are various types of dpi's used

for further info here is the link where u can get the exact dimensions:
http://developer.android.com/guide/practices/screens_support.html

Android crop background

It appears that such thing is achievable only using the ImageView and setting the scaleType parameter accordingly. A quick workaround is to use FrameLayout and put the ImageView under another layout with transparent background.

Code:

<FrameLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        android:src="@drawable/background" />

</FrameLayout>

Android, XML: Show only portion of image in layout container without altering aspect ratio

Use an ImageView inside the linear layout with width and height match_parent and set the scaleType="centerCrop"

<ImageView
    android:src="@drawable/somedrawable"
    android:scaleType="centerCrop"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

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