圆形图片CircleImageView
来源:互联网 发布:手机淘宝货到付款骗局 编辑:程序博客网 时间:2024/05/17 23:40
1、在values文件中创建attrs.xml,自定义属性:
<declare-styleable name="CircleImageView"> <attr name="border_width" format="dimension" /> <attr name="border_color" format="color" /></declare-styleable>
<cn.edu.hust.buildingtalkback.myview.CircleImageView android:id="@+id/target_user_photo" android:layout_width="50dp" android:layout_height="50dp" app:border_width="2dp" app:border_color="@android:color/white" android:src="@mipmap/photo1" android:layout_centerVertical="true" />border_width表示边框宽度,border_color表示边框颜色;
3、CircleImageView源码解析:
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.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;import cn.edu.hust.buildingtalkback.R;/** * Created by admin on 2016/1/9. */public class CircleImageView 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 CircleImageView(Context context) { super(context); } public CircleImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CircleImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); super.setScaleType(SCALE_TYPE); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0); // 获取自定义的参数值,即边框厚度与颜色值 mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH); mBorderColor = a.getColor(R.styleable.CircleImageView_border_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; } canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint); canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint); } @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(); } // ======== 逻辑从setImageXXX方法开始,在XML文件中设置src调用setImageDrawable函数 // 在代码中设置图片一般采用setImageBitmap或者setImageResource方法 // 接下来调用onDraw与draw进行绘制 @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(); } // 获取图片,由Drawable转换成为Bitmap private Bitmap getBitmapFromDrawable(Drawable drawable) { if (drawable == null) { return null; } // 要注意区分BitmapDrawable与ColorDrawable两种情况 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; } } // 记性一些初始化 private void setup() { if (!mReady) { mSetupPending = true; return; } if (mBitmap == null) { return; } // 设置圆形边框绘制效果 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(); // 设置边框边界 mBorderRect.set(0, 0, getWidth(), getHeight()); mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2); // 设置内容图片边界,即ImageView的size减去边框宽度 mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth); mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2); // 更新界面 updateShaderMatrix(); invalidate(); } private void updateShaderMatrix() { float scale; float dx = 0; float dy = 0; mShaderMatrix.set(null); // 计算最好的缩放比例 // 这里其实是判断(mBitmapWidth/mDrawableRect.width()) 与 (mBitmapHeight/ mDrawableRect.height())的大小 // 即将原图像缩放成mDrawableRect所需要对宽高做的缩放比例 if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) { scale = mDrawableRect.height() / (float) mBitmapHeight; dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; // 将Bitmap移动至屏幕中心 } 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); }}
0 0
- Android 圆形图片 CircleImageView
- 自定义圆形图片CircleImageView
- 圆形图片CircleImageView
- 圆形图片CircleImageView
- CircleImageView(圆形图片布局)
- CircleImageView ------圆形图片封装类
- 圆形图片CircleImageView开源库使用
- CircleImageView 圆形图片的学习
- 圆形图片CircleImageView(解决内存溢出)
- 自定义圆形图片显示控件CircleImageView
- 圆形图片CircleImageView的使用和分析
- Android自定义圆形图片控件CircleImageView
- Android 圆形图片 CircleImageView(Xfermode方式)
- Android圆形图片控件CircleImageView的使用
- 圆形图片CircleImageView的使用和分析
- Glide与圆形图片CircleImageView的问题
- github上的圆形图片框架CircleImageView使用及解析
- Glide 加载圆形图片CircleImageView遇到的问题
- windows DLL动态连接库文件的实现和应用
- 基于 intel MKL 的对称矩阵特征值求解器
- 《java从入门到精通》-笔记
- linux 设置用户id
- 了解Java中的线程
- 圆形图片CircleImageView
- Tomcat域名或IP地址访问方式配置方法
- gdb调试时的问题Missing separate debuginfos, use: debuginfo-install glibc-XXX
- Handler的基本用法
- excel函数查找个数
- IOS-事件处理
- 包含一个递归调用的递归。(自调用的格式)
- tomcat多域名配置
- 【ASP】页面引用与过程调用