Question

我有一个矩形图像，我转换为圆形，然后我将该图像设置为imageview。但是我在圆形图像周围得到一个黑色方块。我需要它来匹配白色的其余布局。任何人都可以解释为什么？下面的布局是一个更大的布局的一部分，用作listview的布局。我在另一个应用程序中单独尝试了此代码，它运行正常。 xml布局的默认颜色是那个应用程序中的白色，所以它可能仍在绘制正方形，但我只是看不到它？我原始应用中xml的默认颜色为黑色。这会导致问题吗？

这是布局的一部分

   <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:orientation="horizontal" >

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#fff" >

        <ImageView
            android:id="@+id/iv_profile"
            android:layout_width="90dp"
            android:layout_height="90dp" />
    </RelativeLayout>

Answer 1

使用此课程

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 RoundedCustomImageView extends ImageView{

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

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

    public RoundedCustomImageView(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; 
        }

        try {
            Bitmap b = ((BitmapDrawable) drawable).getBitmap();
            Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
            int w = getWidth(), h = getHeight();
            Bitmap roundBitmap =  getCroppedBitmap(bitmap, w);
            canvas.drawBitmap(roundBitmap, 0,0, null);
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;
        if(bmp.getWidth() != radius || bmp.getHeight() != radius)
            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
        else
            sbmp = bmp;
        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(),sbmp.getHeight(), Config.ARGB_8888);
        //Bitmap output = Bitmap.createBitmap(200,200, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        final int color = 0xffa19774;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());
        //      final Rect rect = new Rect(0, 0, 200, 200);
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor("#030302"));
        canvas.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f,
                sbmp.getWidth() / 2+0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(sbmp, rect, rect, paint);
        return output;
    }}

圆形图像周围有黑色方块

1 个答案: