android: how to align image in the horizontal center of an imageview?

I've tried all 开发者_JS百科scaletypes, but all of them result in the image to be at the left corner of the imageview.

 <ImageView
    android:id="@+id/image"
    android:scaleType="centerInside"

    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:layout_marginRight="6dip"
    android:background="#0000" 
    android:src="@drawable/icon1" />

<ImageView
    android:id="@+id/img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />

Your ImageView has the attribute wrap_content. I would think that the Image is centered inside the imageview but the imageview itself is not centered in the parentview. If you have only the imageview on the screen try match_parent instead of wrap_content. If you have more then one view in the layout you have to center the imageview.

You can center the ImageView itself by using:

android:layout_centerVertical="true" or android:layout_centerHorizontal="true" For vertical or horizontal. Or to center inside the parent:

android:layout_centerInParent="true"

But it sounds like you are trying to center the actual source image inside the imageview itself, which I am not sure on.

This works for me when aligning image view in linearlayout.

<ImageView android:id="@android:id/empty"
    android:src="@drawable/find_icon"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    android:scaleType="center"
    />

Try this code :

 <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center_horizontal">

            <ImageView
                android:id="@+id/imgBusiness"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:src="@drawable/back_detail" />
</LinearLayout>

Using "fill_parent" alone for the layout_width will do the trick:

 <ImageView
    android:id="@+id/image"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="6dip"
    android:background="#0000" 
    android:src="@drawable/icon1" />

Try:

android:layout_height="wrap_content"
android:scaleType="fitStart"

on the image in the RelativeLayout

For me android:gravity="center" did the trick in the parent layout element.

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

    <ImageView
        android:id="@+id/fullImageView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:contentDescription="@string/fullImageView"
        android:layout_gravity="center" />

</LinearLayout>

you can horizontal your image view in a linear layout using:

 android:layout_gravity="center"

it will center your image to the parent element, if you just want to center horizontally you can use:

 android:layout_gravity="center_horizontal"

Give width of image as match_parent and height as required, say 300 dp.

<ImageView
    android:id = "@+id/imgXYZ"
    android:layout_width = "match_parent"
    android:layout_height = "300dp"
    android:src="@drawable/imageXYZ"
    />

Use this attribute: android:layout_centerHorizontal="true"

This is code in xml of how to center an ImageView, I used "layout_centerHorizontal".

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_centerHorizontal="true"
    >
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/img2"
    />
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/img1"
        />
</LinearLayout>

or this other example...

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:gravity="center_horizontal"
    >
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/img2"
    />
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:src="@drawable/img1"
        />
</LinearLayout>