如何在Android中创建一个循环ImageView ?

如何在Android中创建圆整的ImageView ?

我已经尝试了下面的代码，但它不能正常工作。

代码:

Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);


BitmapShader shader = new BitmapShader (bitmap,  TileMode.CLAMP, TileMode.CLAMP);
Paint paint = new Paint();
paint.setShader(shader);


Canvas c = new Canvas(circleBitmap);
c.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, bitmap.getWidth()/2, paint);


imageView.setImageBitmap(circleBitmap);

圆圈内的图像:

Enter image description here

我该怎么做呢?

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最佳答案

我也需要一个圆润的ImageView，我使用了下面的代码，你可以相应地修改它:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;


public class RoundedImageView extends ImageView {


public RoundedImageView(Context context) {
super(context);
}


public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}


public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}


@Override
protected void onDraw(Canvas canvas) {


Drawable drawable = getDrawable();


if (drawable == null) {
return;
}


if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);


int w = getWidth();
@SuppressWarnings("unused")
int h = getHeight();


Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);


}


public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
Bitmap sbmp;


if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
float factor = smallest / radius;
sbmp = Bitmap.createScaledBitmap(bmp,
(int) (bmp.getWidth() / factor),
(int) (bmp.getHeight() / factor), false);
} else {
sbmp = bmp;
}


Bitmap output = Bitmap.createBitmap(radius, radius, Config.ARGB_8888);
Canvas canvas = new Canvas(output);


final String color = "#BAB399";
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, radius, radius);


paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor(color));
canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f,
radius / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);


return output;
}


}

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