我在ImageView添加了一个带圆角的ListView。我的项目工作正常。但并非所有图像的大小都相同。我的代码如下：
holder.img.setImageBitmap(createRoundedBitmap(user.getbi(),20));
private Bitmap createRoundedBitmap(Bitmap getbi, int i) {
if (getbi == null) {
return null;
}
Rect rect = new Rect(0, 0, getbi.getWidth(), getbi.getHeight());
// create output bitmap
Bitmap output = Bitmap.createBitmap(getbi.getWidth(), getbi.getHeight(), Config.ARGB_8888);
// assign canvas with output bitmap
Canvas canvas = new Canvas(output);
canvas.drawARGB(0,0, 0,0);
// initialize paint
Paint paint = new Paint();
paint.setAntiAlias(true);
// draw rounded rect to bitmap
paint.setColor(0xFFFFFFFF);
canvas.drawRoundRect(new RectF(rect), i, i, paint);
// copy original bitmap to rounded area
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(getbi, rect, rect, paint);
return output;
}
那么，我该怎么做才能修复这个位图的大小呢？
答案 0 :(得分：1)
请尝试这种方式，希望这有助于您解决问题。
<强> RoundedImageView.java
public class RoundedImageView extends ImageView {
public static final String TAG = "RoundedImageView";
public static final int DEFAULT_RADIUS = 0;
public static final int DEFAULT_BORDER_WIDTH = 0;
private static final ScaleType[] SCALE_TYPES = {
ScaleType.MATRIX,
ScaleType.FIT_XY,
ScaleType.FIT_START,
ScaleType.FIT_CENTER,
ScaleType.FIT_END,
ScaleType.CENTER,
ScaleType.CENTER_CROP,
ScaleType.CENTER_INSIDE
};
private int mCornerRadius = DEFAULT_RADIUS;
private int mBorderWidth = DEFAULT_BORDER_WIDTH;
private ColorStateList mBorderColor =
ColorStateList.valueOf(RoundedDrawable.DEFAULT_BORDER_COLOR);
private boolean mOval = false;
private boolean mRoundBackground = false;
private int mResource;
private Drawable mDrawable;
private Drawable mBackgroundDrawable;
private ScaleType mScaleType;
public RoundedImageView(Context context) {
super(context);
}
public RoundedImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundedImageView, defStyle, 0);
int index = a.getInt(R.styleable.RoundedImageView_android_scaleType, 1);
if (index >= 0) {
setScaleType(SCALE_TYPES[index]);
} else {
// default scaletype to FIT_CENTER
setScaleType(ScaleType.FIT_CENTER);
}
mCornerRadius = a.getDimensionPixelSize(R.styleable.RoundedImageView_corner_radius, 360);
mBorderWidth = a.getDimensionPixelSize(R.styleable.RoundedImageView_border_width,2);
// don't allow negative values for radius and border
if (mCornerRadius < 0) {
mCornerRadius = DEFAULT_RADIUS;
}
if (mBorderWidth < 0) {
mBorderWidth = DEFAULT_BORDER_WIDTH;
}
mBorderColor = a.getColorStateList(R.styleable.RoundedImageView_border_color);
if (mBorderColor == null) {
mBorderColor = ColorStateList.valueOf(R.color.blue);
}
mRoundBackground = a.getBoolean(R.styleable.RoundedImageView_round_background, false);
mOval = a.getBoolean(R.styleable.RoundedImageView_is_oval, false);
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
a.recycle();
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
invalidate();
}
/**
* Return the current scale type in use by this ImageView.
*
* @attr ref android.R.styleable#ImageView_scaleType
* @see android.widget.ImageView.ScaleType
*/
@Override
public ScaleType getScaleType() {
return mScaleType;
}
/**
* Controls how the image should be resized or moved to match the size
* of this ImageView.
*
* @param scaleType The desired scaling mode.
* @attr ref android.R.styleable#ImageView_scaleType
*/
@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType == null) {
throw new NullPointerException();
}
if (mScaleType != scaleType) {
mScaleType = scaleType;
switch (scaleType) {
case CENTER:
case CENTER_CROP:
case CENTER_INSIDE:
case FIT_CENTER:
case FIT_START:
case FIT_END:
case FIT_XY:
super.setScaleType(ScaleType.FIT_XY);
break;
default:
super.setScaleType(scaleType);
break;
}
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
invalidate();
}
}
@Override
public void setImageDrawable(Drawable drawable) {
mResource = 0;
mDrawable = RoundedDrawable.fromDrawable(drawable);
updateDrawableAttrs();
super.setImageDrawable(mDrawable);
}
@Override
public void setImageBitmap(Bitmap bm) {
mResource = 0;
mDrawable = RoundedDrawable.fromBitmap(bm);
updateDrawableAttrs();
super.setImageDrawable(mDrawable);
}
@Override
public void setImageResource(int resId) {
if (mResource != resId) {
mResource = resId;
mDrawable = resolveResource();
updateDrawableAttrs();
super.setImageDrawable(mDrawable);
}
}
@Override public void setImageURI(Uri uri) {
super.setImageURI(uri);
setImageDrawable(getDrawable());
}
private Drawable resolveResource() {
Resources rsrc = getResources();
if (rsrc == null) {
return null;
}
Drawable d = null;
if (mResource != 0) {
try {
d = rsrc.getDrawable(mResource);
} catch (Exception e) {
Log.w(TAG, "Unable to find resource: " + mResource, e);
// Don't try again.
mResource = 0;
}
}
return RoundedDrawable.fromDrawable(d);
}
@Override
public void setBackground(Drawable background) {
setBackgroundDrawable(background);
}
private void updateDrawableAttrs() {
updateAttrs(mDrawable, false);
}
private void updateBackgroundDrawableAttrs() {
updateAttrs(mBackgroundDrawable, true);
}
private void updateAttrs(Drawable drawable, boolean background) {
if (drawable == null) {
return;
}
if (drawable instanceof RoundedDrawable) {
((RoundedDrawable) drawable)
.setScaleType(mScaleType)
.setCornerRadius(background && !mRoundBackground ? 0 : mCornerRadius)
.setBorderWidth(background && !mRoundBackground ? 0 : mBorderWidth)
.setBorderColors(mBorderColor)
.setOval(mOval);
} else if (drawable instanceof LayerDrawable) {
// loop through layers to and set drawable attrs
LayerDrawable ld = ((LayerDrawable) drawable);
int layers = ld.getNumberOfLayers();
for (int i = 0; i < layers; i++) {
updateAttrs(ld.getDrawable(i), background);
}
}
}
@Override
@Deprecated
public void setBackgroundDrawable(Drawable background) {
mBackgroundDrawable = RoundedDrawable.fromDrawable(background);
updateBackgroundDrawableAttrs();
super.setBackgroundDrawable(mBackgroundDrawable);
}
public int getCornerRadius() {
return mCornerRadius;
}
public void setCornerRadius(int radius) {
if (mCornerRadius == radius) {
return;
}
mCornerRadius = radius;
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
}
public int getBorderWidth() {
return mBorderWidth;
}
public void setBorderWidth(int width) {
if (mBorderWidth == width) {
return;
}
mBorderWidth = width;
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
invalidate();
}
public int getBorderColor() {
return mBorderColor.getDefaultColor();
}
public void setBorderColor(int color) {
setBorderColors(ColorStateList.valueOf(color));
}
public ColorStateList getBorderColors() {
return mBorderColor;
}
public void setBorderColors(ColorStateList colors) {
if (mBorderColor.equals(colors)) {
return;
}
mBorderColor =
(colors != null) ? colors : ColorStateList.valueOf(RoundedDrawable.DEFAULT_BORDER_COLOR);
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
if (mBorderWidth > 0) {
invalidate();
}
}
public boolean isOval() {
return mOval;
}
public void setOval(boolean oval) {
mOval = oval;
updateDrawableAttrs();
updateBackgroundDrawableAttrs();
invalidate();
}
public boolean isRoundBackground() {
return mRoundBackground;
}
public void setRoundBackground(boolean roundBackground) {
if (mRoundBackground == roundBackground) {
return;
}
mRoundBackground = roundBackground;
updateBackgroundDrawableAttrs();
invalidate();
}
}
<强> RoundedDrawable.java
public class RoundedDrawable extends Drawable {
public static final String TAG = "RoundedDrawable";
public static final int DEFAULT_BORDER_COLOR = Color.BLACK;
private final RectF mBounds = new RectF();
private final RectF mDrawableRect = new RectF();
private final RectF mBitmapRect = new RectF();
private final BitmapShader mBitmapShader;
private final Paint mBitmapPaint;
private final int mBitmapWidth;
private final int mBitmapHeight;
private final RectF mBorderRect = new RectF();
private final Paint mBorderPaint;
private final Matrix mShaderMatrix = new Matrix();
private float mCornerRadius = 0;
private boolean mOval = false;
private float mBorderWidth = 0;
private ColorStateList mBorderColor = ColorStateList.valueOf(DEFAULT_BORDER_COLOR);
private ScaleType mScaleType = ScaleType.FIT_CENTER;
public RoundedDrawable(Bitmap bitmap) {
mBitmapWidth = bitmap.getWidth();
mBitmapHeight = bitmap.getHeight();
mBitmapRect.set(0, 0, mBitmapWidth, mBitmapHeight);
mBitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mBitmapShader.setLocalMatrix(mShaderMatrix);
mBitmapPaint = new Paint();
mBitmapPaint.setStyle(Paint.Style.FILL);
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setShader(mBitmapShader);
mBorderPaint = new Paint();
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(mBorderColor.getColorForState(getState(), DEFAULT_BORDER_COLOR));
mBorderPaint.setStrokeWidth(mBorderWidth);
}
public static RoundedDrawable fromBitmap(Bitmap bitmap) {
if (bitmap != null) {
return new RoundedDrawable(bitmap);
} else {
return null;
}
}
public static Drawable fromDrawable(Drawable drawable) {
if (drawable != null) {
if (drawable instanceof RoundedDrawable) {
// just return if it's already a RoundedDrawable
return drawable;
} else if (drawable instanceof LayerDrawable) {
LayerDrawable ld = (LayerDrawable) drawable;
int num = ld.getNumberOfLayers();
// loop through layers to and change to RoundedDrawables if possible
for (int i = 0; i < num; i++) {
Drawable d = ld.getDrawable(i);
ld.setDrawableByLayerId(ld.getId(i), fromDrawable(d));
}
return ld;
}
// try to get a bitmap from the drawable and
Bitmap bm = drawableToBitmap(drawable);
if (bm != null) {
return new RoundedDrawable(bm);
} else {
Log.w(TAG, "Failed to create bitmap from drawable!");
}
}
return drawable;
}
public static Bitmap drawableToBitmap(Drawable drawable) {
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap;
int width = Math.max(drawable.getIntrinsicWidth(), 1);
int height = Math.max(drawable.getIntrinsicHeight(), 1);
try {
bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
} catch (Exception e) {
e.printStackTrace();
bitmap = null;
}
return bitmap;
}
@Override
public boolean isStateful() {
return mBorderColor.isStateful();
}
@Override
protected boolean onStateChange(int[] state) {
int newColor = mBorderColor.getColorForState(state, 0);
if (mBorderPaint.getColor() != newColor) {
mBorderPaint.setColor(newColor);
return true;
} else {
return super.onStateChange(state);
}
}
private void updateShaderMatrix() {
float scale;
float dx;
float dy;
switch (mScaleType) {
case CENTER:
mBorderRect.set(mBounds);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.set(null);
mShaderMatrix.setTranslate((int) ((mBorderRect.width() - mBitmapWidth) * 0.5f + 0.5f),
(int) ((mBorderRect.height() - mBitmapHeight) * 0.5f + 0.5f));
break;
case CENTER_CROP:
mBorderRect.set(mBounds);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.set(null);
dx = 0;
dy = 0;
if (mBitmapWidth * mBorderRect.height() > mBorderRect.width() * mBitmapHeight) {
scale = mBorderRect.height() / (float) mBitmapHeight;
dx = (mBorderRect.width() - mBitmapWidth * scale) * 0.5f;
} else {
scale = mBorderRect.width() / (float) mBitmapWidth;
dy = (mBorderRect.height() - mBitmapHeight * scale) * 0.5f;
}
mShaderMatrix.setScale(scale, scale);
mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth,
(int) (dy + 0.5f) + mBorderWidth);
break;
case CENTER_INSIDE:
mShaderMatrix.set(null);
if (mBitmapWidth <= mBounds.width() && mBitmapHeight <= mBounds.height()) {
scale = 1.0f;
} else {
scale = Math.min(mBounds.width() / (float) mBitmapWidth,
mBounds.height() / (float) mBitmapHeight);
}
dx = (int) ((mBounds.width() - mBitmapWidth * scale) * 0.5f + 0.5f);
dy = (int) ((mBounds.height() - mBitmapHeight * scale) * 0.5f + 0.5f);
mShaderMatrix.setScale(scale, scale);
mShaderMatrix.postTranslate(dx, dy);
mBorderRect.set(mBitmapRect);
mShaderMatrix.mapRect(mBorderRect);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.setRectToRect(mBitmapRect, mBorderRect, Matrix.ScaleToFit.FILL);
break;
default:
case FIT_CENTER:
mBorderRect.set(mBitmapRect);
mShaderMatrix.setRectToRect(mBitmapRect, mBounds, Matrix.ScaleToFit.CENTER);
mShaderMatrix.mapRect(mBorderRect);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.setRectToRect(mBitmapRect, mBorderRect, Matrix.ScaleToFit.FILL);
break;
case FIT_END:
mBorderRect.set(mBitmapRect);
mShaderMatrix.setRectToRect(mBitmapRect, mBounds, Matrix.ScaleToFit.END);
mShaderMatrix.mapRect(mBorderRect);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.setRectToRect(mBitmapRect, mBorderRect, Matrix.ScaleToFit.FILL);
break;
case FIT_START:
mBorderRect.set(mBitmapRect);
mShaderMatrix.setRectToRect(mBitmapRect, mBounds, Matrix.ScaleToFit.START);
mShaderMatrix.mapRect(mBorderRect);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.setRectToRect(mBitmapRect, mBorderRect, Matrix.ScaleToFit.FILL);
break;
case FIT_XY:
mBorderRect.set(mBounds);
mBorderRect.inset((mBorderWidth) / 2, (mBorderWidth) / 2);
mShaderMatrix.set(null);
mShaderMatrix.setRectToRect(mBitmapRect, mBorderRect, Matrix.ScaleToFit.FILL);
break;
}
mDrawableRect.set(mBorderRect);
mBitmapShader.setLocalMatrix(mShaderMatrix);
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
mBounds.set(bounds);
updateShaderMatrix();
}
@Override
public void draw(Canvas canvas) {
if (mOval) {
if (mBorderWidth > 0) {
canvas.drawOval(mDrawableRect, mBitmapPaint);
canvas.drawOval(mBorderRect, mBorderPaint);
} else {
canvas.drawOval(mDrawableRect, mBitmapPaint);
}
} else {
if (mBorderWidth > 0) {
canvas.drawRoundRect(mDrawableRect, Math.max(mCornerRadius, 0),
Math.max(mCornerRadius, 0), mBitmapPaint);
canvas.drawRoundRect(mBorderRect, mCornerRadius, mCornerRadius, mBorderPaint);
} else {
canvas.drawRoundRect(mDrawableRect, mCornerRadius, mCornerRadius, mBitmapPaint);
}
}
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(int alpha) {
mBitmapPaint.setAlpha(alpha);
invalidateSelf();
}
@Override
public void setColorFilter(ColorFilter cf) {
mBitmapPaint.setColorFilter(cf);
invalidateSelf();
}
@Override public void setDither(boolean dither) {
mBitmapPaint.setDither(dither);
invalidateSelf();
}
@Override public void setFilterBitmap(boolean filter) {
mBitmapPaint.setFilterBitmap(filter);
invalidateSelf();
}
@Override
public int getIntrinsicWidth() {
return mBitmapWidth;
}
@Override
public int getIntrinsicHeight() {
return mBitmapHeight;
}
public float getCornerRadius() {
return mCornerRadius;
}
public RoundedDrawable setCornerRadius(float radius) {
mCornerRadius = radius;
return this;
}
public float getBorderWidth() {
return mBorderWidth;
}
public RoundedDrawable setBorderWidth(int width) {
mBorderWidth = width;
mBorderPaint.setStrokeWidth(mBorderWidth);
return this;
}
public int getBorderColor() {
return mBorderColor.getDefaultColor();
}
public RoundedDrawable setBorderColor(int color) {
return setBorderColors(ColorStateList.valueOf(color));
}
public ColorStateList getBorderColors() {
return mBorderColor;
}
public RoundedDrawable setBorderColors(ColorStateList colors) {
mBorderColor = colors != null ? colors : ColorStateList.valueOf(0);
mBorderPaint.setColor(mBorderColor.getColorForState(getState(), DEFAULT_BORDER_COLOR));
return this;
}
public boolean isOval() {
return mOval;
}
public RoundedDrawable setOval(boolean oval) {
mOval = oval;
return this;
}
public ScaleType getScaleType() {
return mScaleType;
}
public RoundedDrawable setScaleType(ScaleType scaleType) {
if (scaleType == null) {
scaleType = ScaleType.FIT_XY;
}
if (mScaleType != scaleType) {
mScaleType = scaleType;
updateShaderMatrix();
}
return this;
}
public Bitmap toBitmap() {
return drawableToBitmap(this);
}
}
<强> attrs.xml
<resources>
<declare-styleable name="RoundedImageView">
<attr name="corner_radius" format="dimension" />
<attr name="border_width" format="dimension" />
<attr name="border_color" format="color" />
<attr name="round_background" format="boolean" />
<attr name="is_oval" format="boolean" />
<attr name="android:scaleType" />
</declare-styleable>
<declare-styleable name="CircleLayout">
<attr name="innerRadius" format="dimension" />
<attr name="sliceDivider" format="reference|color" />
<attr name="innerCircle" format="reference|color" />
<attr name="angleOffset" format="float" />
<attr name="angleRange" format="float" />
<attr name="layoutMode">
<enum name="normal" value="1" />
<enum name="pie" value="2" />
</attr>
<attr name="dividerWidth" format="dimension" />
</declare-styleable>
</resources>
如何使用
<YourPackageName.RoundedImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="centerCrop"/>
答案 1 :(得分：0)
以下链接可能在此处有用
http://murodese.wordpress.com/2010/07/01/rounded-imageviews-in-listviews/
更改宽度和高度：
http://tech.pro/tutorial/620/csharp-tutorial-image-editing-saving-cropping-and-resizing
答案 2 :(得分：0)
试试这个。
private Bitmap createRoundedBitmap(Bitmap getbi, int i,int neededWidth,int neededHeight) {
if (getbi == null) {
return null;
}
Rect rect = new Rect(0, 0, neededWidth, neededHeight);
Rect bmRect = new Rect(0, 0, getbi.getWidth(), getbi.getHeight());
// create output bitmap
Bitmap output = Bitmap.createBitmap(neededWidth, neededHeight, Config.ARGB_8888);
// assign canvas with output bitmap
Canvas canvas = new Canvas(output);
canvas.drawARGB(0,0, 0,0);
// initialize paint
Paint paint = new Paint();
paint.setAntiAlias(true);
// draw rounded rect to bitmap
paint.setColor(0xFFFFFFFF);
canvas.drawRoundRect(new RectF(rect), i, i, paint);
// copy original bitmap to rounded area
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(getbi, bmRect , rect, paint);
return output;
}
用法：
createRoundedBitmap（yourBitmap，5100100）; //你会得到一个位图100x100 px