導(dǎo)讀
有時(shí)候腿准,我們需求上需要實(shí)現(xiàn)圓角圖片的展示肠槽。有很多種處理思路饰抒。但所有思路無非就是把Bitmap修飾成圓角或者圓形。然后顯示出來脑漫。
BitmapShader就幫我們快速的處理了髓抑。
接下來介紹的這種方式,充分體現(xiàn)了Drawable First的思想窿撬。
Drawable First
自定義Drawable,相比View來說叙凡,Drawable屬于輕量級的劈伴、使用也很簡單。以后自定義實(shí)現(xiàn)一個(gè)效果的時(shí)候握爷,可以改變View first的思想跛璧,嘗試下Drawable first掌猛。
先上效果圖
image.png
image.png
1.圓角
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.TileMode;
import android.graphics.drawable.Drawable;
public class CircleImageDrawable extends Drawable
{
private Paint mPaint;
private int mWidth;
private Bitmap mBitmap ;
public CircleImageDrawable(Bitmap bitmap)
{
mBitmap = bitmap ;
BitmapShader bitmapShader = new BitmapShader(bitmap, TileMode.CLAMP,
TileMode.CLAMP);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setShader(bitmapShader);
mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight());
}
@Override
public void draw(Canvas canvas)
{
canvas.drawCircle(mWidth / 2, mWidth / 2, mWidth / 2, mPaint);
}
@Override
public int getIntrinsicWidth()
{
return mWidth;
}
@Override
public int getIntrinsicHeight()
{
return mWidth;
}
@Override
public void setAlpha(int alpha)
{
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf)
{
mPaint.setColorFilter(cf);
}
@Override
public int getOpacity()
{
return PixelFormat.TRANSLUCENT;
}
}
使用方法:
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.mv);
ImageView iv = (ImageView) findViewById(R.id.id_one);
iv.setImageDrawable(new CircleImageDrawable(bitmap));
iv = (ImageView) findViewById(R.id.id_two);
iv.setImageDrawable(new CircleImageDrawable(bitmap))
把Bitmap作為參數(shù)傳給CircleImageDrawable趋厉,就好了!
2.圓形
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.TileMode;
import android.graphics.drawable.Drawable;
public class RoundImageDrawable extends Drawable
{
private Paint mPaint;
private Bitmap mBitmap;
private RectF rectF;
public RoundImageDrawable(Bitmap bitmap)
{
mBitmap = bitmap;
BitmapShader bitmapShader = new BitmapShader(bitmap, TileMode.CLAMP,
TileMode.CLAMP);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setShader(bitmapShader);
}
@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 draw(Canvas canvas)
{
canvas.drawRoundRect(rectF, 30, 30, mPaint);
}
@Override
public int getIntrinsicWidth()
{
return mBitmap.getWidth();
}
@Override
public int getIntrinsicHeight()
{
return mBitmap.getHeight();
}
@Override
public void setAlpha(int alpha)
{
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf)
{
mPaint.setColorFilter(cf);
}
@Override
public int getOpacity()
{
return PixelFormat.TRANSLUCENT;
}
}
使用方法:
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.mv);
ImageView iv = (ImageView) findViewById(R.id.id_one);
iv.setImageDrawable(new RoundImageDrawable(bitmap));
iv = (ImageView) findViewById(R.id.id_two);
iv.setImageDrawable(new RoundImageDrawable(bitmap));
源碼參考我的github地址