后续:优化
package com.su.testimageview;
import com.su.testimageview.AsyncImageLoader.ImageCallback;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;
public class TestImageViewActivity extends Activity {
public static Context context;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = this;
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
AsyncImageLoader asyncImageLoader = new AsyncImageLoader();
Drawable asyndrawable = asyncImageLoader.loadDrawable(
// 直接从url获取drawable
"http://avatar.csdn.net/7/C/8/1_sfshine.jpg", imageView,
new ImageCallback() {//callback方法不用变
public void imageLoaded(Drawable imageDrawable,
ImageView imageView, String imageUrl) {
imageView.setImageDrawable(imageDrawable);
}
});
imageView.setImageDrawable(asyndrawable);// 设置成获取的drawable.
}
}package com.su.testimageview;
import java.lang.ref.SoftReference;
import java.util.HashMap;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;
public class AsyncImageLoader {
// SoftReference是软引用，是为了更好的为了系统回收变量
private HashMap> imageCache;
public AsyncImageLoader() {
imageCache = new HashMap>();
}
/**
*
* @param imageUrl
* 图片网址
* @param imageView
* 所要显示图片的imageview
* @param imageCallback
* 实现一个callback 比较固定
* @return
*/
public Drawable loadDrawable(final String imageUrl,
final ImageView imageView, final ImageCallback imageCallback) {
if (imageCache.containsKey(imageUrl)) {
// 从缓存中获取
SoftReference softReference = imageCache.get(imageUrl);
Drawable drawable = softReference.get();
if (drawable != null) {
return drawable;
}
}
final Handler handler = new Handler() {
public void handleMessage(Message msg) {
imageCallback.imageLoaded((Drawable) msg.obj, imageView,
imageUrl);
}
};
// 建立新一个新的线程下载图片
new Thread() {
public void run() {
Drawable drawable = null;
try {
// 指定大小的图片不进行圆角处理
if (imageUrl.endsWith("/160") || imageUrl.endsWith("/460")) {
drawable = ImageUtil.getDrawableFromUrl(imageUrl);
} else {
drawable = ImageUtil
.geRoundDrawableFromUrl(imageUrl, 7);
}
} catch (Exception e) {
// TODO Auto-generated catch block
// 为空时处理默认图片
Bitmap bm = BitmapFactory.decodeResource(
TestImageViewActivity.context.getResources(),
R.drawable.ic_launcher);
drawable = ImageUtil.byteToDrawable(ImageUtil
.Bitmap2Bytes(ImageUtil.toRoundCorner(bm, 7)));
e.printStackTrace();
}
imageCache.put(imageUrl, new SoftReference(drawable));
Message msg = handler.obtainMessage(0, drawable);
handler.sendMessage(msg);
}
}.start();
return null;
}
// 回调接口
public interface ImageCallback {
public void imageLoaded(Drawable imageDrawable, ImageView imageView,
String imageUrl);
}
}
package com.su.testimageview;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
/**
* 图片圆角处理
*/
public class ImageUtil {
public static InputStream getRequest(String path) throws Exception {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if (conn.getResponseCode() == 200) {
return conn.getInputStream();
}
return null;
}
public static byte[] readInputStream(InputStream inStream) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
outStream.close();
inStream.close();
return outStream.toByteArray();
}
public static Drawable loadImageFromUrl(String url) {
// TODO Auto-generated method stub
URL u;
InputStream i = null;
try {
u = new URL(url);
i = (InputStream) u.getContent();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Drawable d = Drawable.createFromStream(i, "src");
return d;
}
public static Drawable getDrawableFromUrl(String url) throws Exception {
return Drawable.createFromStream(getRequest(url), null);
}
public static Bitmap getBitmapFromUrl(String url) throws Exception {
byte[] bytes = getBytesFromUrl(url);
return byteToBitmap(bytes);
}
public static Bitmap getRoundBitmapFromUrl(String url, int pixels)
throws Exception {
byte[] bytes = getBytesFromUrl(url);
Bitmap bitmap = byteToBitmap(bytes);
return toRoundCorner(bitmap, pixels);
}
public static Drawable geRoundDrawableFromUrl(String url, int pixels)
throws Exception {
byte[] bytes = getBytesFromUrl(url);
BitmapDrawable bitmapDrawable = (BitmapDrawable) byteToDrawable(bytes);
return toRoundCorner(bitmapDrawable, pixels);
}
public static byte[] getBytesFromUrl(String url) throws Exception {
return readInputStream(getRequest(url));
}
public static Bitmap byteToBitmap(byte[] byteArray) {
if (byteArray.length != 0) {
return BitmapFactory
.decodeByteArray(byteArray, 0, byteArray.length);
} else {
return null;
}
}
public static Drawable byteToDrawable(byte[] byteArray) {
ByteArrayInputStream ins = new ByteArrayInputStream(byteArray);
return Drawable.createFromStream(ins, null);
}
public static byte[] Bitmap2Bytes(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
public static Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
/**
* 图片去色,返回灰度图片
*
* @param bmpOriginal
* 传入的图片
* @return 去色后的图片
*/
public static Bitmap toGrayscale(Bitmap bmpOriginal) {
int width, height;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal, 0, 0, paint);
return bmpGrayscale;
}
/**
* 去色同时加圆角
*
* @param bmpOriginal
* 原图
* @param pixels
* 圆角弧度
* @return 修改后的图片
*/
public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
return toRoundCorner(toGrayscale(bmpOriginal), pixels);
}
/**
* 把图片变成圆角
*
* @param bitmap
* 需要修改的图片
* @param pixels
* 圆角的弧度
* @return 圆角图片
*/
public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
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());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
/**
* 使圆角功能支持BitampDrawable
*
* @param bitmapDrawable
* @param pixels
* @return
*/
public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable,
int pixels) {
Bitmap bitmap = bitmapDrawable.getBitmap();
bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));
return bitmapDrawable;
}
}
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