Android实现头像圆角
先看一下效果图
首先在res->values下新建一个xml命名为attrs
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="RoundImageView"> <attr name="type" format="enum"> <enum name="circle" value="1"/> <enum name="round" value="2"/> </attr> <attr name="radius" format="dimension"/> </declare-styleable> </resources>
然后建一个java类，命名 RoundImageView
1 package com.example.logintest.circleImage; 2 3 import android.annotation.SuppressLint; 4 import android.content.Context; 5 import android.content.res.TypedArray; 6 import android.graphics.Bitmap; 7 import android.graphics.BitmapShader; 8 import android.graphics.Canvas; 9 import android.graphics.Matrix; 10 import android.graphics.Paint; 11 import android.graphics.RectF; 12 import android.graphics.Shader; 13 import android.graphics.drawable.Drawable; 14 import android.os.Build; 15 import android.util.AttributeSet; 16 import android.util.TypedValue; 17 import android.widget.ImageView; 18 import com.example.logintest.R; 19 20 21 /** 22 * Created by leo on 17/3/14. 23 */ 24 25 public class RoundImageView extends androidx.appcompat.widget.AppCompatImageView { 26 /** 27 * 圆形模式 28 */ 29 private static final int MODE_CIRCLE = 1; 30 /** 31 * 普通模式 32 */ 33 private static final int MODE_NONE = 0; 34 /** 35 * 圆角模式 36 */ 37 private static final int MODE_ROUND = 2; 38 private Paint mPaint; 39 private int currMode = 0; 40 /** 41 * 圆角半径 42 */ 43 private int currRound = dp2px(10); 44 45 public RoundImageView(Context context) { 46 super(context); 47 initViews(); 48 } 49 50 public RoundImageView(Context context, AttributeSet attrs) { 51 this(context, attrs, 0); 52 } 53 54 public RoundImageView(Context context, AttributeSet attrs, int defStyleAttr) { 55 super(context, attrs, defStyleAttr); 56 obtainStyledAttrs(context, attrs, defStyleAttr); 57 initViews(); 58 } 59 60 private void obtainStyledAttrs(Context context, AttributeSet attrs, int defStyleAttr) { 61 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView, defStyleAttr, 0); 62 currMode = a.hasValue(R.styleable.RoundImageView_type) ? a.getInt(R.styleable.RoundImageView_type, MODE_NONE) : MODE_NONE; 63 currRound = a.hasValue(R.styleable.RoundImageView_radius) ? a.getDimensionPixelSize(R.styleable.RoundImageView_radius, currRound) : currRound; 64 a.recycle(); 65 } 66 67 private void initViews() { 68 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG); 69 } 70 71 @Override 72 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 73 /** 74 * 当模式为圆形模式的时候，我们强制让宽高一致 75 */ 76 if (currMode == MODE_CIRCLE) { 77 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 78 int result = Math.min(getMeasuredHeight(), getMeasuredWidth()); 79 setMeasuredDimension(result, result); 80 } else { 81 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 82 } 83 } 84 85 @SuppressLint("DrawAllocation") 86 @Override 87 protected void onDraw(Canvas canvas) { 88 Drawable mDrawable = getDrawable(); 89 Matrix mDrawMatrix = getImageMatrix(); 90 if (mDrawable == null) { 91 return; // couldn't resolve the URI 92 } 93 94 if (mDrawable.getIntrinsicWidth() == 0 || mDrawable.getIntrinsicHeight() == 0) { 95 return; // nothing to draw (empty bounds) 96 } 97 98 if (mDrawMatrix == null && getPaddingTop() == 0 && getPaddingLeft() == 0) { 99 mDrawable.draw(canvas); 100 } else { 101 final int saveCount = canvas.getSaveCount(); 102 canvas.save(); 103 104 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 105 if (getCropToPadding()) { 106 final int scrollX = getScrollX(); 107 final int scrollY = getScrollY(); 108 canvas.clipRect(scrollX + getPaddingLeft(), scrollY + getPaddingTop(), 109 scrollX + getRight() - getLeft() - getPaddingRight(), 110 scrollY + getBottom() - getTop() - getPaddingBottom()); 111 } 112 } 113 canvas.translate(getPaddingLeft(), getPaddingTop()); 114 if (currMode == MODE_CIRCLE) {//当为圆形模式的时候 115 Bitmap bitmap = drawable2Bitmap(mDrawable); 116 mPaint.setShader(new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)); 117 canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2, mPaint); 118 } else if (currMode == MODE_ROUND) {//当为圆角模式的时候 119 Bitmap bitmap = drawable2Bitmap(mDrawable); 120 mPaint.setShader(new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)); 121 canvas.drawRoundRect(new RectF(getPaddingLeft(), getPaddingTop(), getWidth() - getPaddingRight(), getHeight() - getPaddingBottom()), 122 currRound, currRound, mPaint); 123 } else { 124 if (mDrawMatrix != null) { 125 canvas.concat(mDrawMatrix); 126 } 127 mDrawable.draw(canvas); 128 } 129 canvas.restoreToCount(saveCount); 130 } 131 } 132 133 /** 134 * drawable转换成bitmap 135 */ 136 private Bitmap drawable2Bitmap(Drawable drawable) { 137 if (drawable == null) { 138 return null; 139 } 140 Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); 141 Canvas canvas = new Canvas(bitmap); 142 //根据传递的scaletype获取matrix对象，设置给bitmap 143 Matrix matrix = getImageMatrix(); 144 if (matrix != null) { 145 canvas.concat(matrix); 146 } 147 drawable.draw(canvas); 148 return bitmap; 149 } 150 151 private int dp2px(float value) { 152 return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, getResources().getDisplayMetrics()); 153 } 154 }
这是一个自定义的ImageView
然后就是页面布居中的引用了
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android:background="@color/threefragment_color" android:id="@+id/person"> <com.example.logintest.circleImage.RoundImageView android:id="@+id/img_tx" android:layout_width="100dp" android:layout_height="100dp" app:type="circle" android:src="@drawable/touxiang" android:layout_marginTop="30dp" android:layout_centerHorizontal="true" /> </RelativeLayout>
