Android: Using alignBaseline for an image followin

问题:

Below is a TextView followed by an ImageView contained in RelativeLayout. I'm trying to get the bottom of the image to align with the baseline of the text. When I use alignBaseline for the image,reference the TextView, it is the top of the image that aligns with the baseline of the text instead of the bottom. How can I fix this?

<TextView 
        android:id="@+id/month" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="feb"
        android:textSize="60px"
        android:typeface="serif"
        />
   <ImageView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:paddingLeft="15px"
        android:layout_toRightOf="@id/month"
        android:layout_alignBaseline="@id/month"
        android:src="@drawable/minicalimage" 
        android:id="@+id/calimage"
        />

回答1:

Since API11 you can simply use android:baselineAlignBottom="true"

Prior to API11 you can overwrite getBaseLine() and return image height.

回答2:

You should use both following lines in your ImageView to align bottom of Image view to bottom of nearby TextView:

        android:layout_alignBaseline="@+id/txtview"
        android:baselineAlignBottom="true"

<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >
    <TextView
        android:id="@+id/txtview"
        ... />

    <ImageView
        ...
        android:layout_toRightOf="@+id/txtview"
        android:layout_alignBaseline="@+id/txtview"
        android:baselineAlignBottom="true"
        ...
        />
</RelativeLayout>

回答3:

I was able to accomplish what I wanted to do. I did not utilize alignBaseline, just fixed the problem with padding and resizing the image. Some of the issues I was having arose from having an image too big and it filling up the space undesirably. The code I used to achieve what I wanted is below:

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:paddingLeft="25px"
    android:paddingTop="30px"
    android:id="@+id/LinearLayout1">
    <TextView 
        android:id="@+id/month" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="feb"
        android:textSize="60px"
        android:typeface="serif"
        />
   <ImageView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_toRightOf="@id/month"
        android:layout_alignBottom="@id/month"
        android:paddingBottom="12px"
        android:src="@drawable/minicalimage" 
        android:id="@+id/calimage"
        />
    <TextView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="2011" 
        android:id="@+id/year" 
        android:layout_toRightOf="@id/calimage"
        android:layout_alignBaseline="@id/month"
        android:typeface="serif"
        android:textSize="40px"
        />
</RelativeLayout>

This was the result:

回答4:

I stumbled upon a similar issue, and solved it just by avoiding layout_alignBaseline altogether, relying on layout_alignBottom instead, which is available since API 1.

回答5:

i used a text view instead of an image view and used the new text view's drawable to set the image and it worked:

<TextView 
        android:id="@+id/month" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="feb"
        android:textSize="60px"
        android:typeface="serif"
        />
<TextView 
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:paddingLeft="15px"
        android:layout_toRightOf="@id/month"
        android:layout_alignBaseline="@id/month"
        android:drawableRight="@drawable/minicalimage" 
        android:id="@+id/calimage"
        />

回答6:

/**
 * Set whether to set the baseline of this view to the bottom of the view.
 * Setting this value overrides any calls to setBaseline.
 *
 * @param aligned If true, the image view will be baseline aligned with
 *      based on its bottom edge.
 *
 * @attr ref android.R.styleable#ImageView_baselineAlignBottom
 */
public void setBaselineAlignBottom(boolean aligned) {
    if (mBaselineAlignBottom != aligned) {
        mBaselineAlignBottom = aligned;
        requestLayout();
    }
}

回答7:

You want to use the android:layout_alignBottom attribute to align the ImageView with the baseline of another View.

In the sample below I aligned the ImageView to another TextView. I included the code for the ImageView, and not the TextView. In order to align to the TextView you'll just need to include the id of the TextView.

Adjusting the margin or padding will result in the Views being misaligned if the user changes the text size on their device.

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?attr/selectableItemBackground">

        <!-- additional code here -->

        <ImageView
            android:id="@+id/message_time_chevron_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@id/replies_username_id"
            android:layout_alignParentRight="true"
            android:clickable="true"
            android:src="@drawable/ic_chevron_right"/>

        <!-- additional code here -->

</RelativeLayout>