实现正六边形、圆形及带倒角正六边形的头像显示
从网上下的一个圆形头像demo,然后在上面的基础上实现了自己的正六边形及带倒角的正六边形。
废话不多说,直接上代码
import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.widget.ImageView; public class HexagonImageView extends ImageView {private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP; private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888; private static final int COLORDRAWABLE_DIMENSION = 1; private static final int DEFAULT_BORDER_WIDTH = 0; private static final int DEFAULT_BORDER_COLOR = Color.BLACK; 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; public HexagonImageView(Context context) {super(context); }public HexagonImageView(Context context, AttributeSet attrs) {this(context, attrs, 0); }public HexagonImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle); super.setScaleType(SCALE_TYPE); initView(context,attrs,defStyle); }private void initView(Context context, AttributeSet attrs,int defStyle) {TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HexagonImageView, defStyle, 0); mBorderWidth = a.getDimensionPixelSize(R.styleable.HexagonImageView_borders_width, DEFAULT_BORDER_WIDTH); mBorderColor = a.getColor(R.styleable.HexagonImageView_borders_color, DEFAULT_BORDER_COLOR); a.recycle(); 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(String.format("ScaleType %s not supported.", scaleType)); }}@Override protected void onDraw(Canvas canvas) {if (getDrawable() == null) {return; }drawRadius(canvas,mDrawableRadius,mBitmapPaint); drawRadius(canvas,mBorderRadius,mBorderPaint); //float radius = getWidth()/2; // float a1 = (float) (mDrawableRadius*Math.sin(radian30)); // float b1 = (float) (mDrawableRadius*Math.cos(radian30)); // 画正六边形 // Path drawablePath = new Path(); // drawablePath.moveTo(centerX, 0); // drawablePath.lineTo(centerX + b1, centerY-a1); // drawablePath.lineTo(centerX+b1, centerY+a1); // drawablePath.lineTo(centerX, getHeight()); // drawablePath.lineTo(centerX-b1, centerY+a1); // drawablePath.lineTo(centerX - b1, centerY - a1); // drawablePath.close(); // canvas.drawPath(drawablePath, mBitmapPaint); // float a2 = (float) (mBorderRadius*Math.sin(radian30)); // float b2 = (float) (mBorderRadius*Math.cos(radian30)); // // Path borderPath = new Path(); // borderPath.moveTo(centerX, 0); // borderPath.lineTo(centerX + b2, centerY-a2); // borderPath.lineTo(centerX+b2, centerY+a2); // borderPath.lineTo(centerX, getHeight()); // borderPath.lineTo(centerX-b2, centerY+a2); // borderPath.lineTo(centerX - b2, centerY - a2); // borderPath.close(); // canvas.drawPath(drawablePath, mBitmapPaint); // canvas.drawPath(borderPath,mBorderPaint); //画圆 // canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint); // canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint); } //画一个带倒角的正六边形,主要是一个算法,描点。 private void drawRadius(Canvas canvas, float radius,Paint paint) {double radian30 = 30*Math.PI/180; double radian60 = 60*Math.PI/180; float centerX = getWidth()/2; float centerY = getHeight()/2; // 通过此值修改正六边形的倒角弧度 float z1 = radius/8; float x1 = (float) (z1*Math.cos(radian30)); float y1 = (float) (z1*Math.sin(radian30)); float m1 = (float) Math.abs(Math.sqrt(z1 * z1 + radius * radius - radius * z1)); float o1 = (float) Math.asin(z1 * Math.sin(radian60) / m1); float p1 = (float) (m1*Math.sin(radian60-o1)); float q1 = (float) (m1*Math.cos(radian60 - o1)); float e1 = (float) (m1*Math.cos(radian30-o1)); float f1 = (float) (m1*Math.sin(radian30 - o1)); float a1 = (float) (radius*Math.sin(radian30)); float b1 = (float) (radius*Math.cos(radian30)); Path drawablePath = new Path(); drawablePath.moveTo(centerX - x1, y1);//起始点坐标 drawablePath.quadTo(centerX, 0, centerX + x1, y1); //第一个点是辅助点 //第二个点是终止点 画弧 drawablePath.lineTo(centerX + p1, centerY - q1); drawablePath.quadTo(centerX + b1, centerY - a1, centerX + e1, centerY - f1); drawablePath.lineTo(centerX + e1, centerY + f1); drawablePath.quadTo(centerX+b1, centerY+a1 , centerX + p1, centerY + q1); drawablePath.lineTo(centerX + x1, getHeight() - y1); drawablePath.quadTo(centerX , getHeight() , centerX - x1, getHeight() - y1); drawablePath.lineTo(centerX - p1, centerY + q1); drawablePath.quadTo(centerX-b1, centerY+a1 , centerX - e1, centerY + f1); drawablePath.lineTo(centerX - e1, centerY - f1); drawablePath.quadTo(centerX - b1, centerY - a1 , centerX - p1, centerY - q1); drawablePath.close(); canvas.drawPath(drawablePath, paint); }@Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh); setup(); }public int getBorderColor() {return mBorderColor; }public void setBorderColor(int borderColor) {if (borderColor == mBorderColor) {return; }mBorderColor = borderColor; mBorderPaint.setColor(mBorderColor); invalidate(); }public int getBorderWidth() {return mBorderWidth; }public void setBorderWidth(int borderWidth) {if (borderWidth == mBorderWidth) {return; }mBorderWidth = borderWidth; setup(); }@Override public void setImageBitmap(Bitmap bm) {super.setImageBitmap(bm); mBitmap = bm; setup(); }@Override public void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable); mBitmap = getBitmapFromDrawable(drawable); setup(); }@Override public void setImageResource(int resId) {super.setImageResource(resId); 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 = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG); } else {bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG); }Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; } catch (OutOfMemoryError e) {return null; }}private void setup() {if (!mReady) {mSetupPending = true; return; }if (mBitmap == null) {return; }mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); mBitmapPaint.setAntiAlias(true); mBitmapPaint.setShader(mBitmapShader); mBorderPaint.setStyle(Paint.Style.STROKE); mBorderPaint.setAntiAlias(true); mBorderPaint.setColor(mBorderColor); mBorderPaint.setStrokeWidth(mBorderWidth); mBitmapHeight = mBitmap.getHeight(); mBitmapWidth = mBitmap.getWidth(); mBorderRect.set(0, 0, getWidth(), getHeight()); mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2); mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth); mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2); updateShaderMatrix(); invalidate(); }private void updateShaderMatrix() {float scale; float dx = 0; float dy = 0; mShaderMatrix.set(null); if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {scale = mDrawableRect.height() / (float) mBitmapHeight; dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; } else {scale = mDrawableRect.width() / (float) mBitmapWidth; dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f; }mShaderMatrix.setScale(scale, scale); mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth); mBitmapShader.setLocalMatrix(mShaderMatrix); } }
自定义属性
<declare-styleable name="HexagonImageView"> <attr name="borders_width" format="dimension" /> <attr name="borders_color" format="color" /> </declare-styleable>
xml文件
android:id="@+id/iv_avatar" android:layout_centerInParent="true" android:src="@drawable/my_head_def" android:layout_marginTop="10dp" android:layout_width="@dimen/avatar_size" android:layout_height="@dimen/avatar_size" app:borders_width="0dp" app:borders_color="@color/transparent"
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