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845天前import java.lang.ref.SoftReference; |
import java.net.URL; |
import java.util.HashMap; |
import java.util.Map; |
import java.util.concurrent.ExecutorService; |
import java.util.concurrent.Executors; |
import android.graphics.drawable.Drawable; |
import android.os.Handler; |
import android.util.Log; |
/** |
* 线程池+缓存+Handler加载图片 |
*/ |
public class AsyncLoadImage { |
//缓存 |
private Map<String, SoftReference<Drawable>> imageCache = new HashMap<String, SoftReference<Drawable>>(); |
//线程池 |
private ExecutorService executorService = Executors.newFixedThreadPool(20);//总共有10个线程循环使用 |
//Hanlder |
private Handler mHandler = new Handler(); |
public interface ImageCallback { |
void imageLoad(Drawable image, String imageUrl); |
} |
/** |
* |
* @param imageUrl 图片的地址 |
* @param imageCallback 回调接口 |
* @return 返回内存中缓存的图像 第一次返回null |
*/ |
public Drawable loadDrawable(final String imageUrl, final ImageCallback imageCallback) { |
Log.i("AsyncLoadImage", "loadDrawable()" + imageUrl); |
//如果缓存中有则从缓存中取出来 |
if(imageCache.containsKey(imageUrl)) { |
SoftReference<Drawable> softReference = imageCache.get(imageUrl); |
if(softReference.get() != null) { //判断是否有drawable |
return softReference.get(); //有则返回 |
} |
} |
//使用线程池下载图片 |
executorService.submit(new Runnable() { |
@Override |
public void run() { |
try { |
// final Drawable drawable = Drawable.createFromStream(new URL(imageUrl).openStream(), "image.jpg"); |
final Drawable drawable = getDrawableFormUrl(imageUrl); //调用获取数据的方法 |
imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));//将加载的图片放入到内存中 |
mHandler.post(new Runnable() { |
@Override |
public void run() { |
imageCallback.imageLoad(drawable, imageUrl); //接口回调 |
} |
}); |
} catch (Exception e) { |
throw new RuntimeException(); |
} |
} |
}); |
return null ; |
} |
/** |
* 从网络上获取数据 |
*/ |
public Drawable getDrawableFormUrl(String imageUrl) { |
Drawable drawable = null ; |
try { |
drawable = Drawable.createFromStream(new URL(imageUrl).openStream(), "image.jpg"); |
} catch (Exception e) { |
throw new RuntimeException(); |
} |
return drawable ; |
} |
} |
