There is often a situation in Android development that is to display the pictures uploaded by the user in a circular style, but the pictures uploaded by the user can have various uncertain styles such as right angles, rounded corners, squares, etc. At this time, a custom ImageView control is used to make all the received pictures displayed in a circular style on the Android client.
public class CircleImageView extends ImageView {
private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;
private static final BITMAP_CONFIG = .ARGB_8888;
private static final int COLORDRAWABLE_DIMENSION = 2;
// The thickness default value of the circular border. // If it is 0, there is no sky blue gradient border. private static final int DEFAULT_BORDER_WIDTH = 0;
private static final int DEFAULT_BORDER_COLOR = ;
private final RectF mDrawableRect = new RectF();
private final RectF mBorderRect = new RectF();
private final Matrix mShaderMatrix = new Matrix();
private final Paint mBitmapPaint = new Paint();
private final Paint mBorderPaint = new Paint();
private int mBorderColor = DEFAULT_BORDER_COLOR;
private int mBorderWidth = DEFAULT_BORDER_WIDTH;
private Bitmap mBitmap;
private BitmapShader mBitmapShader;
private int mBitmapWidth;
private int mBitmapHeight;
private float mDrawableRadius;
private float mBorderRadius;
private boolean mReady;
private boolean mSetupPending;
private final Paint mFlagBackgroundPaint = new Paint();
private final TextPaint mFlagTextPaint = new TextPaint();
private String mFlagText;
private boolean mShowFlag = false;
private Rect mFlagTextBounds = new Rect();
Shader mSweepGradient = null;
public CircleImageView(Context context) {
super(context);
init();
}
public CircleImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
(SCALE_TYPE);
mReady = true;
if (mSetupPending) {
setup();
mSetupPending = false;
}
}
@Override
public ScaleType getScaleType() {
return SCALE_TYPE;
}
@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType != SCALE_TYPE) {
throw new IllegalArgumentException((
"ScaleType %s not supported.", scaleType));
}
}
@Override
public void setAdjustViewBounds(boolean adjustViewBounds) {
if (adjustViewBounds) {
throw new IllegalArgumentException(
"adjustViewBounds not supported.");
}
}
@Override
protected void onDraw(Canvas canvas) {
if (getDrawable() == null) {
return;
}
(getWidth() / 2, getHeight() / 2, mDrawableRadius,
mBitmapPaint);
if (mBorderWidth != 0) {
();
(20, getWidth() / 2, getHeight() / 2);
(getWidth() / 2, getHeight() / 2, mBorderRadius,
mBorderPaint);
();
}
if (mShowFlag && mFlagText != null) {
(mBorderRect, 40, 100, false, mFlagBackgroundPaint);
(mFlagText, 0, (),
mFlagTextBounds);
(mFlagText, getWidth() / 2,
(float) ((3 + ((float) ( * 5 / 18)))
* getHeight() / 4 + () / 3),
mFlagTextPaint);
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
(w, h, oldw, oldh);
setup();
}
public int getBorderColor() {
return mBorderColor;
}
public void setBorderColor(int borderColor) {
if (borderColor == mBorderColor) {
return;
}
mBorderColor = borderColor;
(mBorderColor);
invalidate();
}
public int getBorderWidth() {
return mBorderWidth;
}
/**
* @param borderWidth
* Round border thickness.
*/
public void setBorderWidth(int borderWidth) {
if (borderWidth == mBorderWidth) {
return;
}
mBorderWidth = borderWidth;
setup();
}
@Override
public void setImageBitmap(Bitmap bm) {
(bm);
mBitmap = bm;
setup();
}
@Override
public void setImageDrawable(Drawable drawable) {
(drawable);
mBitmap = getBitmapFromDrawable(drawable);
setup();
}
@Override
public void setImageResource(int resId) {
(resId);
mBitmap = getBitmapFromDrawable(getDrawable());
setup();
}
@Override
public void setImageURI(Uri uri) {
(uri);
mBitmap = getBitmapFromDrawable(getDrawable());
setup();
}
private Bitmap getBitmapFromDrawable(Drawable drawable) {
if (drawable == null) {
return null;
}
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
try {
Bitmap bitmap;
if (drawable instanceof ColorDrawable) {
bitmap = (COLORDRAWABLE_DIMENSION,
COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
} else {
bitmap = ((),
(), BITMAP_CONFIG);
}
Canvas canvas = new Canvas(bitmap);
(0, 0, (), ());
(canvas);
return bitmap;
} catch (OutOfMemoryError e) {
return null;
}
}
private void setup() {
if (!mReady) {
mSetupPending = true;
return;
}
if (mBitmap == null) {
return;
}
mBitmapShader = new BitmapShader(mBitmap, ,
);
(true);
(mBitmapShader);
();
(true);
(mBorderColor);
(mBorderWidth);
mBitmapHeight = ();
mBitmapWidth = ();
(0, 0, getWidth(), getHeight());
mBorderRadius = ((() - mBorderWidth) / 2,
(() - mBorderWidth) / 2);
(mBorderWidth, mBorderWidth, ()
- mBorderWidth, () - mBorderWidth);
mDrawableRadius = (() / 2,
() / 2);
( & 0x66FFFFFF);
(TextPaint.ANTI_ALIAS_FLAG);
(TextPaint.ANTI_ALIAS_FLAG);
();
();
mFlagTextPaint
.setTextSize(getResources().getDisplayMetrics().density * 18);
mSweepGradient = new SweepGradient(getWidth() / 2, getHeight() / 2,
new int[] { (255, 255, 255), (1, 209, 255) },
null);
(mSweepGradient);
updateShaderMatrix();
invalidate();
}
private void updateShaderMatrix() {
float scale;
float dx = 0;
float dy = 0;
(null);
if (mBitmapWidth * () > ()
* mBitmapHeight) {
scale = () / (float) mBitmapHeight;
dx = (() - mBitmapWidth * scale) * 0.5f;
} else {
scale = () / (float) mBitmapWidth;
dy = (() - mBitmapHeight * scale) * 0.5f;
}
(scale, scale);
((int) (dx + 0.5f) + mBorderWidth,
(int) (dy + 0.5f) + mBorderWidth);
(mShaderMatrix);
}
public void setShowFlag(boolean show) {
mShowFlag = show;
invalidate();
}
public void setFlagText(String text) {
mFlagText = text;
invalidate();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:andro xmlns:app="/apk/res-auto" xmlns:tools="/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > < android:layout_width="match_parent" android:layout_height="match_parent"/> <／LinearLayout>
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