android 实现圆形头像
16lz
2021-01-23
1、首先看一下实现效果
2、首先新建一个自定义view实现ImageView，详细可看注释
package com.example.a550211.xfermode;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.View;import android.widget.ImageView;/** * Created by 550211 on 2017/9/23. */public class MyImageView extends ImageView { private Paint mPaint;//设置画笔 private Bitmap mBitmap;//获取图片资源 private int width, height;//获取控件宽高 private int mOuterRing = 0;//设置外圈大小 private int outerRingAlpha = 30;//设置外圈透明度 private int color = Color.BLUE;//设置外圈颜色 public MyImageView(Context context) { this(context, null); } public MyImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyImageView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mPaint = new Paint(); } public Bitmap getBitmap() { return mBitmap; } public void setBitmap(Bitmap bitmap) { this.mBitmap = bitmap; } public int getmOuterRing() { return mOuterRing; } public void setmOuterRing(int mOuterRing) { this.mOuterRing = mOuterRing; } public int getColor() { return color; } public void setColor(int color) { this.color = color; } public int getOuterRingAlpha() { return outerRingAlpha; } public void setOuterRingAlpha(int outerRingAlpha) { this.outerRingAlpha = outerRingAlpha; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //获取空间宽高 width = View.getDefaultSize(getMeasuredWidth(), widthMeasureSpec); height = View.getDefaultSize(getMeasuredHeight(), heightMeasureSpec); } @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); Bitmap bitmap; if (drawable != null) { if (mBitmap != null) { bitmap = mBitmap; } else { bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); } Matrix matrix = new Matrix(); //设置图片缩放比例， if (mOuterRing>0){ if (width > height) { matrix.setScale((float) (height) / bitmap.getHeight(), (float) (height) / bitmap.getHeight()); } else { matrix.setScale((float) (width) / bitmap.getWidth(), (float) (width) / bitmap.getWidth()); } }else { if (width > height) { matrix.setScale((float) (width) / bitmap.getWidth(), (float) (width) / bitmap.getWidth()); } else { matrix.setScale((float) (height) / bitmap.getHeight(), (float) (height) / bitmap.getHeight()); } } bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); //将图片设置为圆形 bitmap = toRoundBitmap(bitmap); //当外圈大于0的时候要设置外圈加图片的宽度不能大于控件宽度 if (mOuterRing+bitmap.getWidth()>width){ mOuterRing = (width-bitmap.getWidth())/2; } //绘制外圈 Paint cPaint = new Paint(); cPaint.setStrokeWidth(2); cPaint.setColor(color); cPaint.setAlpha(outerRingAlpha); // cPaint.setFilterBitmap(true); cPaint.setAntiAlias(true); canvas.drawCircle(bitmap.getWidth()/2+mOuterRing,bitmap.getHeight()/2+mOuterRing,bitmap.getWidth()/2+mOuterRing,cPaint); //绘制图片 canvas.drawBitmap(bitmap, mOuterRing, mOuterRing, mPaint); } else { super.onDraw(canvas); } } /** * 设置图片为圆形 * * @param bitmap * @return */ public Bitmap toRoundBitmap(Bitmap bitmap) { int width = bitmap.getWidth(); int height = bitmap.getHeight(); float roundPx; float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom; if (width <= height) { roundPx = width / 2; top = 0; bottom = width; left = 0; right = width; height = width; dst_left = 0; dst_top = 0; dst_right = width; dst_bottom = width; } else { roundPx = height / 2; float clip = (width - height) / 2; left = clip; right = width - clip; top = 0; bottom = height; width = height; dst_left = 0; dst_top = 0; dst_right = height; dst_bottom = height; } Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect src = new Rect((int) left, (int) top, (int) right, (int) bottom); final Rect dst = new Rect((int) dst_left, (int) dst_top, (int) dst_right, (int) dst_bottom); final RectF rectF = new RectF(dst_left, dst_top, dst_right, dst_bottom); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, src, dst, paint); return output; }} package com.example.a550211.xfermode;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;public class MainActivity extends AppCompatActivity { private MyImageView imageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.aa); imageView = (MyImageView) findViewById(R.id.MyImageView); imageView.setBitmap(bitmap); imageView.setmOuterRing(56); 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