圆角 自动回收 ImageViewstyles.xml <declare-styleable name="RecycleableRoundCorneImageView"> <attr name="roundWidth" format="dimension" /> <attr name="roundHeight" format="dimension" /></declare-styleable>//使用<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:lyn="http://schemas.android.com/apk/res/com.example.pa" <!-- com.example.pa 跟menifest里的package 一样 --> android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <com.example.pa.wedget.RecycleableRoundCorneImageView android:layout_width="100dp" android:layout_height="100dp" android:scaleType="fitXY" android:src="@drawable/z" lyn:roundHeight="10dp" lyn:roundWidth="10dp" /></LinearLayout>//代码public class RecycleableRoundCorneImageView extends ImageView {private Paint paint;private int roundWidth = 5;private int roundHeight = 5;private Paint paint2;private Bitmap preBitmap = null;private Bitmap mPrevBG = null;public RecycleableRoundCorneImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context, attrs);}public RecycleableRoundCorneImageView(Context context, AttributeSet attrs) {super(context, attrs);init(context, attrs);}public RecycleableRoundCorneImageView(Context context) {super(context);init(context, null);}private void init(Context context, AttributeSet attrs) {if (attrs != null) {TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RecycleableRoundCorneImageView);roundWidth = a.getDimensionPixelSize(R.styleable.RecycleableRoundCorneImageView_roundWidth, roundWidth);roundHeight = a.getDimensionPixelSize(R.styleable.RecycleableRoundCorneImageView_roundHeight, roundHeight);} else {float density = context.getResources().getDisplayMetrics().density;roundWidth = (int) (roundWidth * density);roundHeight = (int) (roundHeight * density);}paint = new Paint();paint.setColor(Color.WHITE);paint.setAntiAlias(true);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));paint2 = new Paint();paint2.setXfermode(null);}@Overridepublic void draw(Canvas canvas) {Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Config.ARGB_8888);Canvas canvas2 = new Canvas(bitmap);super.draw(canvas2);drawLiftUp(canvas2);drawRightUp(canvas2);drawLiftDown(canvas2);drawRightDown(canvas2);canvas.drawBitmap(bitmap, 0, 0, paint2);bitmap.recycle();}private void drawLiftUp(Canvas canvas) {Path path = new Path();path.moveTo(0, roundHeight);path.lineTo(0, 0);path.lineTo(roundWidth, 0);path.arcTo(new RectF(0, 0, roundWidth * 2, roundHeight * 2), -90, -90);path.close();canvas.drawPath(path, paint);}private void drawLiftDown(Canvas canvas) {Path path = new Path();path.moveTo(0, getHeight() - roundHeight);path.lineTo(0, getHeight());path.lineTo(roundWidth, getHeight());path.arcTo(new RectF(0, getHeight() - roundHeight * 2, 0 + roundWidth * 2, getWidth()), 90, 90);path.close();canvas.drawPath(path, paint);}private void drawRightDown(Canvas canvas) {Path path = new Path();path.moveTo(getWidth() - roundWidth, getHeight());path.lineTo(getWidth(), getHeight());path.lineTo(getWidth(), getHeight() - roundHeight);path.arcTo(new RectF(getWidth() - roundWidth * 2, getHeight() - roundHeight * 2, getWidth(), getHeight()), 0, 90);path.close();canvas.drawPath(path, paint);}private void drawRightUp(Canvas canvas) {Path path = new Path();path.moveTo(getWidth(), roundHeight);path.lineTo(getWidth(), 0);path.lineTo(getWidth() - roundWidth, 0);path.arcTo(new RectF(getWidth() - roundWidth * 2, 0, getWidth(), 0 + roundHeight * 2), -90, 90);path.close();canvas.drawPath(path, paint);}@Overridepublic void setImageBitmap(Bitmap bm) {if (preBitmap != null && preBitmap != bm) {if (!preBitmap.isRecycled()) {System.out.println("setImageBitmap -> recycle");preBitmap.recycle();}}preBitmap = bm;if (bm != null) {super.setImageDrawable(new BitmapDrawable(bm));} else {super.setImageDrawable(new ColorDrawable(0x0));}}@Overridepublic void setImageDrawable(Drawable d) {if (preBitmap != null) {Bitmap curBitmap = null;if (d != null && d instanceof BitmapDrawable) {curBitmap = ((BitmapDrawable) d).getBitmap();}if (preBitmap != curBitmap) {if (!preBitmap.isRecycled()) {System.out.println("setImageDrawable -> recycle");preBitmap.recycle();}preBitmap = null;}}super.setImageDrawable(d);}@Overridepublic void setImageResource(int resId) {if (preBitmap != null) {Drawable dw = getDrawable();if (!preBitmap.isRecycled()) {System.out.println("setImageResource-> recycle");preBitmap.recycle();}if (dw != null && dw instanceof BitmapDrawable) {Bitmap bm = ((BitmapDrawable) dw).getBitmap();if (bm == preBitmap) {super.setImageDrawable(new ColorDrawable(0x0));}}preBitmap = null;}super.setImageResource(resId);}// 背景@Overridepublic void setBackgroundDrawable(Drawable background) {if (mPrevBG != null) {Bitmap curBG = null;if (background != null && background instanceof BitmapDrawable) {curBG = ((BitmapDrawable) background).getBitmap();}if (mPrevBG != curBG) {if (!mPrevBG.isRecycled()) {System.out.println("setBackgroundDrawable -> recycle");mPrevBG.recycle();}mPrevBG = null;}}super.setBackgroundDrawable(background);}@Overridepublic void setBackgroundResource(int resid) {if (mPrevBG != null) {Drawable dw = getBackground();if (!mPrevBG.isRecycled()) {System.out.println("setBackgroundResource-> recycle");mPrevBG.recycle();}if (dw != null && dw instanceof BitmapDrawable) {Bitmap bm = ((BitmapDrawable) dw).getBitmap();if (bm == mPrevBG) {super.setImageDrawable(new ColorDrawable(0x0));}}mPrevBG = null;}super.setBackgroundResource(resid);}}
