Android圆形图片和圆角图片的绘制。
自定义ImageView
import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.RectF; import android.graphics.Bitmap.Config; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.View; import android.view.View.MeasureSpec; import com.aynu.circleimageview.R; /** * * @author zhy * */ public class CustomImageView extends View { /** * TYPE_CIRCLE / TYPE_ROUND */ private int type; private static final int TYPE_CIRCLE = 0; private static final int TYPE_ROUND = 1; /** *bitmap */ private Bitmap mSrc; /** *半径 */ private int mRadius; /** * ?ؼ?长度? */ private int mWidth; /** * ?高度? */ private int mHeight; public CustomImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CustomImageView(Context context) { this(context, null); } /** * ?获取属性值?? * * @param context * @param attrs * @param defStyle */ public CustomImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyle, 0); int n = a.getIndexCount(); for (int i = 0; i < n; i++) { int attr = a.getIndex(i); switch (attr) { case R.styleable.CustomImageView_src://获取图片,自定义属性,设置图片并获取 mSrc = BitmapFactory.decodeResource(getResources(), a.getResourceId(attr, 0)); break; case R.styleable.CustomImageView_type://获取图片要设置圆形还是圆角图片 type = a.getInt(attr, 0); break; case R.styleable.CustomImageView_borderRadius://半径值 mRadius = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f, getResources().getDisplayMetrics())); break; } } a.recycle(); } /** * ????ؼ??测量? */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // super.onMeasure(widthMeasureSpec, heightMeasureSpec); /** * ???获取宽度测量模式和大小? */ int specMode = MeasureSpec.getMode(widthMeasureSpec); int specSize = MeasureSpec.getSize(widthMeasureSpec); if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate精确的 { mWidth = specSize; } else { // ? int desireByImg = getPaddingLeft() + getPaddingRight() + mSrc.getWidth();//图片的大小,和测量出来的大小比较 if (specMode == MeasureSpec.AT_MOST)// wrap_content { mWidth = Math.min(desireByImg, specSize); } } /*** * ??获取高度的测量模式? */ specMode = MeasureSpec.getMode(heightMeasureSpec); specSize = MeasureSpec.getSize(heightMeasureSpec); if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate { mHeight = specSize; } else { int desire = getPaddingTop() + getPaddingBottom() + mSrc.getHeight(); if (specMode == MeasureSpec.AT_MOST)// wrap_content { mHeight = Math.min(desire, specSize); } } setMeasuredDimension(mWidth, mHeight); } /** * ???? */ @Override protected void onDraw(Canvas canvas) { switch (type) { // ???圆形图片 case TYPE_CIRCLE: int min = Math.min(mWidth, mHeight); /** * 使得当前的图片的宽和高一致Bitmap */ mSrc = Bitmap.createScaledBitmap(mSrc, min, min, false); //绘制圆角图片 canvas.drawBitmap(createCircleImage(mSrc, min), 0, 0, null); break; case TYPE_ROUND: //圆角图片 canvas.drawBitmap(createRoundConerImage(mSrc), 0, 0, null); break; } } /** * * @param source * @param min * @return */ private Bitmap createCircleImage(Bitmap source, int min) { //画笔 final Paint paint = new Paint(); paint.setAntiAlias(true); //创建Bitmap对象 Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888); /** * 绘制? */ Canvas canvas = new Canvas(target); /** * 画圆 */ canvas.drawCircle(min / 2, min / 2, min / 2, paint); /** * ???设置mode?????? */ paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); /** * ???画图像 */ canvas.drawBitmap(source, 0, 0, paint); return target; } /** * ?? * * @param source * @return */ private Bitmap createRoundConerImage(Bitmap source) { final Paint paint = new Paint(); paint.setAntiAlias(true); //创建bitmap Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888); //绘制图像 Canvas canvas = new Canvas(target); RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight()); canvas.drawRoundRect(rect, 50f, 50f, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); //图片,大小,绘制的地方 canvas.drawBitmap(source, 0, 0, paint); return target; } }
activity_main.xml文件:
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:zhy="http://schemas.android.com/apk/res-auto" android:orientation="vertical"> <imageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:src="@mipmap/icon"> <com.aynu.circleimageview.customimageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" zhy:src="@mipmap/icon" zhy:type="circle"> <com.aynu.circleimageview.customimageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" zhy:borderradius="10dp" zhy:src="@mipmap/icon" zhy:type="round"> <com.aynu.circleimageview.customimageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" zhy:borderradius="20dp" zhy:src="@mipmap/icon" zhy:type="round"> </com.aynu.circleimageview.customimageview></com.aynu.circleimageview.customimageview></com.aynu.circleimageview.customimageview></imageview></linearlayout>
res/attrs文件
<!--?xml version="1.0" encoding="utf-8"?--> <resources> <enum name="circle" value="0"> <enum name="round" value="1"> </enum></enum></attr> </attr> <declare-styleable name="CustomImageView"> </attr></attr></attr></declare-styleable> </attr></resources>