Android 使用

注意这样子的PNG加载方法当中，不要把文件放在anyDPI当中

package com.lenovo.frank.utils;import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.widget.ImageView;public class CircleImageView extends ImageView {//画笔private Paint mPaint;//圆形图片的半径private int mRadius;//图片的宿放比例private float mScale;public CircleImageView(Context context) {super(context);}public CircleImageView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);}public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);//由于是圆形，宽高应保持一致int size = Math.min(getMeasuredWidth(), getMeasuredHeight());mRadius = size / 2;//这一步应该没有错setMeasuredDimension(size, size);}@SuppressLint("DrawAllocation")@Overrideprotected void onDraw(Canvas canvas) {mPaint = new Paint();Drawable drawable = getDrawable();if (null != drawable) {Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();//初始化BitmapShader，传入bitmap对象BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);//计算缩放比例mScale = (mRadius * 2.0f) / Math.min(bitmap.getHeight(), bitmap.getWidth());Matrix matrix = new Matrix();matrix.setScale(mScale, mScale);bitmapShader.setLocalMatrix(matrix);mPaint.setShader(bitmapShader);//画圆形，指定好坐标，半径，画笔canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);} else {super.onDraw(canvas);}}}

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