自定义圆形图片 ImageView

第一步，创建类：CircleImageView.java   

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package cn.tedu.musicclient.ui;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapShader;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.RectF;

import android.graphics.Shader;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.ColorDrawable;

import android.graphics.drawable.Drawable;

import android.util.AttributeSet;

import android.widget.ImageView;

public class CircleImageView extends ImageView {

private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;

private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;

private static final int COLORDRAWABLE_DIMENSION = 1;

private static final int DEFAULT_BORDER_WIDTH = 2;

private static final int DEFAULT_BORDER_COLOR = Color.WHITE;

private final RectF mDrawableRect = new RectF();

private final RectF mBorderRect = new RectF();

private final Matrix mShaderMatrix = new Matrix();

private final Paint mBitmapPaint = new Paint();

private final Paint mBorderPaint = new Paint();

private int mBorderColor = DEFAULT_BORDER_COLOR;

private int mBorderWidth = DEFAULT_BORDER_WIDTH;

private Bitmap mBitmap;

private BitmapShader mBitmapShader;

private int mBitmapWidth;

private int mBitmapHeight;

private float mDrawableRadius;

private float mBorderRadius;

private boolean mReady;

private boolean mSetupPending;

public CircleImageView(Context context) {

super(context);

}

public CircleImageView(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public CircleImageView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

super.setScaleType(SCALE_TYPE);

mReady = true;

if (mSetupPending) {

setup();

mSetupPending = false;

}

}

@Override

public ScaleType getScaleType() {

return SCALE_TYPE;

}

@Override

public void setScaleType(ScaleType scaleType) {

if (scaleType != SCALE_TYPE) {

throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));

}

}

@Override

protected void onDraw(Canvas canvas) {

if (getDrawable() == null) {

return;

}

canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);

canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);

}

@Override

protected void onSizeChanged(int w, int h, int oldw, int oldh) {

super.onSizeChanged(w, h, oldw, oldh);

setup();

}

public int getBorderColor() {

return mBorderColor;

}

public void setBorderColor(int borderColor) {

if (borderColor == mBorderColor) {

return;

}

mBorderColor = borderColor;

mBorderPaint.setColor(mBorderColor);

invalidate();

}

public int getBorderWidth() {

return mBorderWidth;

}

public void setBorderWidth(int borderWidth) {

if (borderWidth == mBorderWidth) {

return;

}

mBorderWidth = borderWidth;

setup();

}

@Override

public void setImageBitmap(Bitmap bm) {

super.setImageBitmap(bm);

mBitmap = bm;

setup();

}

@Override

public void setImageDrawable(Drawable drawable) {

super.setImageDrawable(drawable);

mBitmap = getBitmapFromDrawable(drawable);

setup();

}

@Override

public void setImageResource(int resId) {

super.setImageResource(resId);

mBitmap = getBitmapFromDrawable(getDrawable());

setup();

}

private Bitmap getBitmapFromDrawable(Drawable drawable) {

if (drawable == null) {

return null;

}

if (drawable instanceof BitmapDrawable) {

return ((BitmapDrawable) drawable).getBitmap();

}

try {

Bitmap bitmap;

if (drawable instanceof ColorDrawable) {

bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);

} else {

bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);

}

Canvas canvas = new Canvas(bitmap);

drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());

drawable.draw(canvas);

return bitmap;

} catch (OutOfMemoryError e) {

return null;

}

}

private void setup() {

if (!mReady) {

mSetupPending = true;

return;

}

if (mBitmap == null) {

return;

}

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

mBitmapPaint.setAntiAlias(true);

mBitmapPaint.setShader(mBitmapShader);

mBorderPaint.setStyle(Paint.Style.STROKE);

mBorderPaint.setAntiAlias(true);

mBorderPaint.setColor(mBorderColor);

mBorderPaint.setStrokeWidth(mBorderWidth);

mBitmapHeight = mBitmap.getHeight();

mBitmapWidth = mBitmap.getWidth();

mBorderRect.set(0, 0, getWidth(), getHeight());

mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);

mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);

mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);

updateShaderMatrix();

invalidate();

}

private void updateShaderMatrix() {

float scale;

float dx = 0;

float dy = 0;

mShaderMatrix.set(null);

if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {

scale = mDrawableRect.height() / (float) mBitmapHeight;

dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;

} else {

scale = mDrawableRect.width() / (float) mBitmapWidth;

dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;

}

mShaderMatrix.setScale(scale, scale);

mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);

mBitmapShader.setLocalMatrix(mShaderMatrix);

}

}

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第二步：在布局文件中 定义

  <LinearLayout

        android:id="@+id/linearLayout1"

        android:layout_width="match_parent"

        android:layout_height="50dp"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        android:orientation="horizontal"

        android:paddingLeft="10dp"

        android:paddingTop="2dp"

        android:paddingBottom="2dp"

        android:background="#05a0a2" >

        <!-- 圆形imageView -->

        <cn.tedu.musicclient.ui.CircleImageView 

            android:id="@+id/ivCMPic"

            android:onClick="doClick"

            android:src="@drawable/ic_launcher"

            android:layout_width="46dp"

            android:layout_height="46dp"/>

        <TextView

            android:id="@+id/tvCMName"

            android:layout_width="wrap_content"

            android:layout_height="46dp"

            android:gravity="center_vertical"

            android:textColor="#ffffff"

            android:paddingLeft="10dp"

            android:text="我是歌手" />