Crop square image to circle - Programmatically

问题:

i was searching for past one day and i was not successful .

i get the image from API , and i download it to a bitmap file using the following code .

private Bitmap DownloadImage(String URL) 
    {
        Bitmap bitmap = null;
        InputStream in = null;
        try 
        {
            in = OpenHttpConnection(URL);
            bitmap = BitmapFactory.decodeStream(in);
            in.close();
        }
        catch (IOException e1) 
        {
            e1.printStackTrace();
        }
        return bitmap;
    }

    private InputStream OpenHttpConnection(String urlString) throws IOException 
    {
        InputStream in = null;
        int response = -1;

        URL url = new URL(urlString);
        URLConnection conn = url.openConnection();

        if (!(conn instanceof HttpURLConnection))
            throw new IOException("Not an HTTP connection");

        try 
        {
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect();

            response = httpConn.getResponseCode();
            if (response == HttpURLConnection.HTTP_OK) 
            {
                in = httpConn.getInputStream();
            }
        }
        catch (Exception ex) 
        {
            throw new IOException("Error connecting");
        }
        return in;
    }

And i get the image as a square and i want to crop the four corners and make it to circular image . Is there any possible way to achieve ?

Any related answers are welcomed . Thanks in advance .

回答1:

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        DrawingView dv = new DrawingView(this);
        setContentView(dv);
    }

    class DrawingView extends View {
        Bitmap bitmap;

        public DrawingView(Context context) {
            super(context);
            bitmap = BitmapFactory.decodeResource(context.getResources(),
                    R.drawable.glossy_overlay);

        }

        @Override
        public void onDraw(Canvas canvas) {
            Paint paint = new Paint();
            // paint.setColor(Color.CYAN);
            canvas.drawBitmap(getclip(), 30, 20, paint);
        }

        public Bitmap getclip() {
            Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
                    bitmap.getHeight(), Config.ARGB_8888);
            Canvas canvas = new Canvas(output);
            final int color = 0xff424242;
            final Paint paint = new Paint();
            final Rect rect = new Rect(0, 0, bitmap.getWidth(),
                    bitmap.getHeight());

            paint.setAntiAlias(true);
            canvas.drawARGB(0, 0, 0, 0);
            // paint.setColor(color);
            canvas.drawCircle(bitmap.getWidth() / 2,
                    bitmap.getHeight() / 2, bitmap.getWidth() / 2, paint);
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
            canvas.drawBitmap(bitmap, rect, rect, paint);
            return output;
        }
    }
}

回答2:

Once the bitmap is retrieved RoundedBitmapDrawableFactory can be used to generate a RoundedBitmapDrawable from the v4 Support Library. That Drawable can then be applied to an ImageView or directly drawn to a Canvas.

// Create the RoundedBitmapDrawable.
RoundedBitmapDrawable roundDrawable = RoundedBitmapDrawableFactory.create(getResources(), bitmap);
roundDrawable.setCircular(true);

// Apply it to an ImageView.
ImageView imageView = (ImageView)findViewById(R.id.imageView);
imageView.setImageDrawable(roundDrawable);

// Alternatively, draw it to an canvas (e.g. in onDraw where a Canvas is available).
// setBounds since there's no View handling size and positioning.
roundDrawable.setBounds(left, top, right, bottom);
roundDrawable.draw(canvas);

回答3:

use the function blow to draw circle on bitmap and then set the circled bitmap to imageview

public static Bitmap getclip(Bitmap bitmap) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
            bitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
            bitmap.getWidth() / 2, paint);
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);
    return output;
}

回答4:

Roman Nurik propose a very direct use of shaders to do things like that, with a custom drawable.

I change the code a bit to make an oval image and tested myself. The effect and performance are really good:

public  class StreamDrawable extends Drawable {
private static final boolean USE_VIGNETTE = true;

private final RectF mRect = new RectF();
private final BitmapShader mBitmapShader;
private final Paint mPaint;
private final int mMargin;

public StreamDrawable(Bitmap bitmap, int margin) {

    mBitmapShader = new BitmapShader(bitmap,
            Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setShader(mBitmapShader);

    mMargin = margin;
}

@Override
protected void onBoundsChange(Rect bounds) {
    super.onBoundsChange(bounds);
    mRect.set(mMargin, mMargin, bounds.width() - mMargin, bounds.height() - mMargin);

    if (USE_VIGNETTE) {
        RadialGradient vignette = new RadialGradient(
                mRect.centerX(), mRect.centerY() * 1.0f / 0.7f, mRect.centerX() * 1.3f,
                new int[] { 0, 0, 0x7f000000 }, new float[] { 0.0f, 0.7f, 1.0f },
                Shader.TileMode.CLAMP);

        Matrix oval = new Matrix();
        oval.setScale(1.0f, 0.7f);
        vignette.setLocalMatrix(oval);

        mPaint.setShader(
                new ComposeShader(mBitmapShader, vignette, PorterDuff.Mode.SRC_OVER));
    }
}

@Override
public void draw(Canvas canvas) {
    canvas.drawOval(mRect, mPaint);
}

@Override
public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
}

@Override
public void setAlpha(int alpha) {
    mPaint.setAlpha(alpha);
}

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

回答5:

This can be simply done in xml, Please see my answer here: https://stackoverflow.com/a/18287979/665930

<RelativeLayout
            android:id="@+id/icon_layout"
            android:layout_width="@dimen/icon_mask"
            android:layout_height="@dimen/icon_mask"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true" >

            <ImageView
                android:id="@+id/icon"
                android:layout_width="@dimen/icon"
                android:layout_height="@dimen/icon"
                android:layout_centerInParent="true"
                android:scaleType="fitXY" >
            </ImageView>

            <ImageView
                android:id="@+id/icon_mask"
                android:layout_width="@dimen/icon_mask"
                android:layout_height="@dimen/icon_mask"
                android:layout_centerInParent="true"
                android:background="@drawable/circle"
                android:scaleType="fitXY" >
            </ImageView>


 </RelativeLayout>


<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >
    <gradient android:startColor="#00FFFFFF" android:endColor="#00FFFFFF"
        android:angle="270"/>
     <stroke android:width="10dp" android:color="#FFAAAAAA"/>

回答6:

I tried the solutions above but none worked well for me. This is because my phone camera don't take square image but just rectangle images. So, I make some changes in the @actsai solution to always take the minor dimension and then crop the image in a circle:

public static Bitmap getBitmapClip(Bitmap bitmap) {
    int maxLenth = bitmap.getWidth() <= bitmap.getHeight() ? bitmap.getWidth() : bitmap.getHeight();
    Bitmap output = Bitmap.createBitmap(maxLenth,
            maxLenth, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, maxLenth, maxLenth);

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    canvas.drawCircle(maxLenth / 2, maxLenth / 2,
            maxLenth / 2, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);
    return output;
}

I used the following scale property to fill my ImageView with the new bitmap:

<ImageView
    android:id="@+id/iv_photo"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:scaleType="fitXY" />