android自定义圆形控件,android 自定义圆形imageview控件

首先，定义定义圆形Imageview类：

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 RoundImageView extends ImageView {

public RoundImageView(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public RoundImageView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public RoundImageView(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();

if(null == b)

{

return;

}

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);

}

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);

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());

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

canvas.drawARGB(0, 0, 0, 0);

paint.setColor(Color.parseColor("#BAB399"));

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;

}

}

然后在别的布局文件中使用该控件即可，如：

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/side_right"

android:gravity="center"

android:orientation="vertical" >

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:layout_marginTop="35dip"

android:orientation="vertical" >

<com.founder.reader.view.RoundImageView

android:id="@+id/right_login_head"

android:layout_width="60dip"

android:layout_height="60dip"

android:scaleType="centerInside"

android:src="@drawable/user" />

原文：http://blog.youkuaiyun.com/hellochenlian/article/details/38512561