裁剪方形图像圈 - 编程 [英] Crop square image to circle - Programmatically

问题描述

我在寻找过去的一天，我是不会成功的。

我从API的形象，我用下面的code将其下载到一个位图文件。

 私人位图DownloadImage（字符串URL）
    {
        点阵位图= NULL;
        在的InputStream = NULL;
        尝试
        {
            在= OpenHttpConnection（URL）;
            位= BitmapFactory.de codeStream（中）;
            附寄（）;
        }
        赶上（IOException异常E1）
        {
            e1.printStackTrace（）;
        }
        返回的位图;
    }

    私人的InputStream OpenHttpConnection（字符串urlString）抛出IOException异常
    {
        在的InputStream = NULL;
        INT响应= -1;

        网址URL =新的URL（urlString）;
        URLConnection的康恩= url.openConnection（）;

        如果（！（康涅狄格州的instanceof的HttpURLConnection））
            抛出新的IOException异常（不是一个HTTP连接）;

        尝试
        {
            HttpURLConnection的httpConn =（HttpURLConnection类），康涅狄格州;
            httpConn.setAllowUserInteraction（假）;
            httpConn.setInstanceFollowRedirects（真正的）;
            httpConn.setRequestMethod（GET）;
            httpConn.connect（）;

            响应= httpConn.getResponse code（）;
            如果（响应== HttpURLConnection.HTTP_OK）
            {
                在= httpConn.getInputStream（）;
            }
        }
        赶上（例外前）
        {
            抛出新的IOException异常（错误连接）;
        }
        返回;
    }
 

和我得到的图像作为一个正方形，我要裁剪的四个角落，并使其圆形图像。有没有取得任何可能的方式？

任何相关的答案，欢迎。先谢谢了。

解决方案

 公共类MainActivity延伸活动{
    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        // TODO自动生成方法存根
        super.onCreate（savedInstanceState）;
        DrawingView DV =新DrawingView（本）;
        的setContentView（DV）;
    }

    类DrawingView扩展视图{
        点阵位图;

        公共DrawingView（上下文的背景下）{
            超（上下文）;
            位= BitmapFactory.de codeResource（context.getResources（）
                    R.drawable.glossy_overlay）;

        }

        @覆盖
        公共无效的OnDraw（帆布油画）{
            涂料粉刷=新的油漆（）;
            // paint.setColor（Color.CYAN）;
            canvas.drawBitmap（getclip（），30，20，油漆）;
        }

        公共位图getclip（）{
            位图输出= Bitmap.createBitmap（bitmap.getWidth（）
                    bitmap.getHeight（），Config.ARGB_8888）;
            帆布油画=新的Canvas（输出）;
            最终诠释色= 0xff424242;
            最终的涂料粉刷=新的油漆（）;
            最终矩形矩形=新的Rect（0，0，bitmap.getWidth（），
                    bitmap.getHeight（））;

            paint.setAntiAlias​​（真正的）;
            canvas.drawARGB（0，0，0，0）;
            // paint.setColor（彩色）;
            canvas.drawCircle（bitmap.getWidth（）/ 2，
                    bitmap.getHeight（）/ 2，bitmap.getWidth（）/ 2，油漆）;
            paint.setXfermode（新PorterDuffXfermode（Mode.SRC_IN））;
            canvas.drawBitmap（位图，矩形，矩形，油漆）;
            返回输出;
        }
    }
}
 

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 .

解决方案

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;
        }
    }
}

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