27
2017
09

自定义Drawable实现圆形和圆角Drawable

圆形

package com.customview.widget;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.support.annotation.IntRange;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

/** * 自定义Drawable 实现圆形图片 * Created by hust_twj on 2017/9/26. */

public class CircleDrawable extends Drawable {
    private Paint mPaint;
    private int mWidth; //宽/高,直径
    private Bitmap mBitmap;

    public CircleDrawable(Bitmap bitmap) {
        this.mBitmap = bitmap;
        BitmapShader bitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);//着色器 水平和竖直都需要填充满
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setShader(bitmapShader);
        mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight()); //宽高的最小值作为直径
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        canvas.drawCircle(mWidth/2, mWidth/2, mWidth/2, mPaint); //绘制圆形
    }

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int i) {
        mPaint.setAlpha(i);
    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
        mPaint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT; //设置系统默认,让drawable支持和窗口一样的透明度
    }

    //还需要从重写以下2个方法,返回drawable实际宽高
    @Override
    public int getIntrinsicWidth() {
        return mWidth;
    }

    @Override
    public int getIntrinsicHeight() {
        return mWidth;
    }


}

圆角:

package com.customview.widget;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;
import android.support.annotation.IntRange;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

/** * 自定义Drawable 实现圆角图片 * Created by hust_twj on 2017/9/26. */

public class RoundCornerDrawable extends Drawable {
    private Paint mPaint;
    private RectF rectF;//定义矩形区域
    private Bitmap mBitmap;

    public RoundCornerDrawable(Bitmap bitmap) {
        this.mBitmap = bitmap;
        BitmapShader bitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);//着色器 水平和竖直都需要填充满
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setShader(bitmapShader);
        //rectF = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        //RectF:圆角矩形区域
        canvas.drawRoundRect(new RectF(0, 0, mBitmap.getWidth(), mBitmap.getHeight()),100, 100, mPaint);//rx:x方向上的圆角半径; ry:y方向上的圆角半径。
    }

/* @Override public void setBounds(int left, int top, int right, int bottom) { super.setBounds(left, top, right, bottom); rectF = new RectF(left, top, right, bottom); }*/

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int i) {
        mPaint.setAlpha(i);
    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
        mPaint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT; //设置系统默认,让drawable支持和窗口一样的透明度
    }

    //还需要从重写以下2个方法,返回drawable实际宽高
    @Override
    public int getIntrinsicWidth() {
        return mBitmap.getWidth();
    }

    @Override
    public int getIntrinsicHeight() {
        return mBitmap.getHeight();
    }

}

MainActivity中:

Bitmap bitmap =  BitmapFactory.decodeResource(getResources(), R.drawable.XXX);
imageView.setImageDrawable(new RoundCornerDrawable(bitmap));
上一篇:android adt 网络请求 下一篇:安卓开发 封装 一个通用 的AlertDialog,亲测好用