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ImageView that respects an aspect ratio applied to a specific measurement.
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// Copyright 2012 Square, Inc. | |
import android.content.Context; | |
import android.content.res.TypedArray; | |
import android.util.AttributeSet; | |
import android.widget.ImageView; | |
/** Maintains an aspect ratio based on either width or height. Disabled by default. */ | |
public class AspectRatioImageView extends ImageView { | |
// NOTE: These must be kept in sync with the AspectRatioImageView attributes in attrs.xml. | |
public static final int MEASUREMENT_WIDTH = 0; | |
public static final int MEASUREMENT_HEIGHT = 1; | |
private static final float DEFAULT_ASPECT_RATIO = 1f; | |
private static final boolean DEFAULT_ASPECT_RATIO_ENABLED = false; | |
private static final int DEFAULT_DOMINANT_MEASUREMENT = MEASUREMENT_WIDTH; | |
private float aspectRatio; | |
private boolean aspectRatioEnabled; | |
private int dominantMeasurement; | |
public AspectRatioImageView(Context context) { | |
this(context, null); | |
} | |
public AspectRatioImageView(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AspectRatioImageView); | |
aspectRatio = a.getFloat(R.styleable.AspectRatioImageView_aspectRatio, DEFAULT_ASPECT_RATIO); | |
aspectRatioEnabled = a.getBoolean(R.styleable.AspectRatioImageView_aspectRatioEnabled, | |
DEFAULT_ASPECT_RATIO_ENABLED); | |
dominantMeasurement = a.getInt(R.styleable.AspectRatioImageView_dominantMeasurement, | |
DEFAULT_DOMINANT_MEASUREMENT); | |
a.recycle(); | |
} | |
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | |
super.onMeasure(widthMeasureSpec, heightMeasureSpec); | |
if (!aspectRatioEnabled) { | |
return; | |
} | |
int newWidth; | |
int newHeight; | |
switch (dominantMeasurement) { | |
case MEASUREMENT_WIDTH: | |
newWidth = getMeasuredWidth(); | |
newHeight = (int) (newWidth / aspectRatio); | |
break; | |
case MEASUREMENT_HEIGHT: | |
newHeight = getMeasuredHeight(); | |
newWidth = (int) (newHeight * aspectRatio); | |
break; | |
default: | |
throw new IllegalStateException("Unknown measurement with ID " + dominantMeasurement); | |
} | |
setMeasuredDimension(newWidth, newHeight); | |
} | |
/** Get the aspect ratio for this image view. */ | |
public float getAspectRatio() { | |
return aspectRatio; | |
} | |
/** Set the aspect ratio for this image view. This will update the view instantly. */ | |
public void setAspectRatio(float aspectRatio) { | |
this.aspectRatio = aspectRatio; | |
if (aspectRatioEnabled) { | |
requestLayout(); | |
} | |
} | |
/** Get whether or not forcing the aspect ratio is enabled. */ | |
public boolean getAspectRatioEnabled() { | |
return aspectRatioEnabled; | |
} | |
/** set whether or not forcing the aspect ratio is enabled. This will re-layout the view. */ | |
public void setAspectRatioEnabled(boolean aspectRatioEnabled) { | |
this.aspectRatioEnabled = aspectRatioEnabled; | |
requestLayout(); | |
} | |
/** Get the dominant measurement for the aspect ratio. */ | |
public int getDominantMeasurement() { | |
return dominantMeasurement; | |
} | |
/** | |
* Set the dominant measurement for the aspect ratio. | |
* | |
* @see #MEASUREMENT_WIDTH | |
* @see #MEASUREMENT_HEIGHT | |
*/ | |
public void setDominantMeasurement(int dominantMeasurement) { | |
if (dominantMeasurement != MEASUREMENT_HEIGHT && dominantMeasurement != MEASUREMENT_WIDTH) { | |
throw new IllegalArgumentException("Invalid measurement type."); | |
} | |
this.dominantMeasurement = dominantMeasurement; | |
requestLayout(); | |
} | |
} |
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<resources> | |
<declare-styleable name="AspectRatioImageView"> | |
<attr name="aspectRatio" format="float" /> | |
<attr name="aspectRatioEnabled" format="boolean" /> | |
<attr name="dominantMeasurement"> | |
<enum name="width" value="0"/> | |
<enum name="height" value="1"/> | |
</attr> | |
</declare-styleable> | |
</resources> |
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