最近有個蜂巢布局的需求，需求實現android六邊形imageview，實現了正：1.六邊形圖片截取顯示。2.截取居中內容。

效果如下：

轉載注明：http://blog.csdn.net/u014614038/article/details/77481041
代碼如下：

package beehive.hw.com.beehivecontent;import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.RectF; import android.graphics.Region; 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.view.MotionEvent; import android.widget.ImageView;/*** Created by bifan-wei*/public class HexagonImageView extends ImageView {private String tag = "HexagonImageView";private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;private static final int COLORDRAWABLE_DIMENSION = 1;private static final Matrix mShaderMatrix = new Matrix();private static final Paint mBitmapPaint = new Paint();private BitmapShader mBitmapShader;private int mBitmapWidth;private int mBitmapHeight;private int mWidth = 0;private Bitmap mBitmap;public HexagonImageView(Context context) {super(context);init();}public HexagonImageView(Context context, AttributeSet attrs) {super(context, attrs, 0);init();}public HexagonImageView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}private void init() {this.setClickable(true);}@Overrideprotected void onDraw(Canvas canvas) {Drawable drawable = getDrawable();if (drawable == null || getWidth() * getHeight() == 0) {return;}mBitmap = getBitmapFromDrawable(drawable);if (mBitmap == null) {return;}setup();canvas.drawPath(getHexagonPath(), mBitmapPaint);}private Path mPath = null;public Path getHexagonPath() {if (mPath == null) {mPath = new Path();}float d = (float) ((float)mWidth / 4 * (2 - Math.sqrt(3)));//六邊形到邊到內切圓的距離float r = mWidth/4;float p0x = r;float p0y = d;float p1x = r*3;float p1y = d;float p2x = mWidth;float p2y = mWidth/2;float p3x = p1x;float p3y = mWidth-d;float p4x = p0x;float p4y = p3y;float p5x = 0;float p5y = p2y;mPath.reset();mPath.moveTo(p0x,p0y);mPath.lineTo(p1x,p1y);mPath.lineTo(p2x,p2y);mPath.lineTo(p3x,p3y);mPath.lineTo(p4x,p4y);mPath.lineTo(p5x,p5y);mPath.lineTo(p0x,p0y);return mPath;}private Boolean DownOnEffectiveArea = false;@Overridepublic void setOnTouchListener(OnTouchListener l) {super.setOnTouchListener(l);}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()){case MotionEvent.ACTION_DOWN:CheckIfDownOnffectiveArea(event);break;case MotionEvent.ACTION_MOVE:break;case MotionEvent.ACTION_UP:break;}return super.onTouchEvent(event);}@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {//if (event.getAction() == MotionEvent.ACTION_DOWN) {if (!CheckIfDownOnffectiveArea(event)) { return false;}// }return super.dispatchTouchEvent(event);}private Boolean CheckIfDownOnffectiveArea(MotionEvent event) {DownOnEffectiveArea = computeRegion(mPath).contains((int)event.getX(),(int)event.getY());return DownOnEffectiveArea;}private Region computeRegion(Path path) {Region region = new Region();RectF f = new RectF();path.computeBounds(f, true);region.setPath(path, new Region((int) f.left, (int) f.top, (int) f.right, (int) f.bottom));return region;}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);//限制為正方形mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight());setMeasuredDimension(mWidth, mWidth);}public int getmWidth() {return mWidth;}@Overridepublic void setImageBitmap(Bitmap bm) {super.setImageBitmap(bm);invalidate();}@Overridepublic void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable);invalidate();}@Overridepublic void setImageResource(int resId) {super.setImageResource(resId);invalidate();}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, mWidth, mWidth);drawable.draw(canvas);return bitmap;} catch (OutOfMemoryError e) {return null;}}private void setup() {if (mBitmap != null) {mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);mBitmapPaint.setAntiAlias(true);mBitmapHeight = mBitmap.getHeight();mBitmapWidth = mBitmap.getWidth();updateShaderMatrix();mBitmapPaint.setShader(mBitmapShader);}}private void updateShaderMatrix() {float scale;mShaderMatrix.set(null);if (mBitmapWidth != mBitmapHeight) {scale = Math.max((float) mWidth / mBitmapWidth, (float) mWidth / mBitmapHeight);} else {scale = (float) mWidth / mBitmapWidth;}mShaderMatrix.setScale(scale, scale);//放大鋪滿float dx = mWidth - mBitmapWidth * scale;float dy = mWidth - mBitmapHeight * scale;mShaderMatrix.postTranslate(dx / 2, dy / 2);//平移居中mBitmapShader.setLocalMatrix(mShaderMatrix);}}

使用：

<beehive.hw.com.beehivecontent.HexagonImageViewandroid:id="@+id/hexagonview1"android:layout_gravity="center"android:layout_width="match_parent"android:layout_height="match_parent"android:src="@mipmap/pic"/> holder.hexagonImageView.setImageResource(R.mipmap.pic);

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