这是一个同步加载。(我个人不会使用这个原因,如果要加载的图像太多,应用程序有点滞后)..
URL url = new URL(//your URL);
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);//your imageview
如果我是你,我会学习 Async 或惰性适配器。
编辑
我忘记了我从哪里得到这些代码(感谢您提供了一位出色的代码作者)
这里是
public Bitmap getBitmap(String bitmapUrl) {
try {
URL url = new URL(bitmapUrl);
return BitmapFactory.decodeStream(url.openConnection().getInputStream());
}
catch(Exception ex) {return null;}
}
public enum BitmapManager {
INSTANCE;
private final Map<String, SoftReference<Bitmap>> cache;
private final ExecutorService pool;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
private Bitmap placeholder;
BitmapManager() {
cache = new HashMap<String, SoftReference<Bitmap>>();
pool = Executors.newFixedThreadPool(5);
}
public void setPlaceholder(Bitmap bmp) {
placeholder = bmp;
}
public Bitmap getBitmapFromCache(String url) {
if (cache.containsKey(url)) {
return cache.get(url).get();
}
return null;
}
public void queueJob(final String url, final ImageView imageView,
final int width, final int height) {
/* Create handler in UI thread. */
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
String tag = imageViews.get(imageView);
if (tag != null && tag.equals(url)) {
if (msg.obj != null) {
imageView.setImageBitmap((Bitmap) msg.obj);
} else {
imageView.setImageBitmap(placeholder);
Log.d(null, "fail " + url);
}
}
}
};
pool.submit(new Runnable() {
public void run() {
final Bitmap bmp = downloadBitmap(url, width, height);
Message message = Message.obtain();
message.obj = bmp;
Log.d(null, "Item downloaded: " + url);
handler.sendMessage(message);
}
});
}
public void loadBitmap(final String url, final ImageView imageView,
final int width, final int height) {
imageViews.put(imageView, url);
Bitmap bitmap = getBitmapFromCache(url);
// check in UI thread, so no concurrency issues
if (bitmap != null) {
Log.i("inh","Item loaded from cache: " + url);
imageView.setImageBitmap(bitmap);
} else {
imageView.setImageBitmap(placeholder);
queueJob(url, imageView, width, height);
}
}
private Bitmap downloadBitmap(String url, int width, int height) {
try {
Bitmap bitmap = BitmapFactory.decodeStream((InputStream) new URL(
url).getContent());
bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
Log.i("nandi2 ako", ""+bitmap);
cache.put(url, new SoftReference<Bitmap>(bitmap));
return bitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
现在调用它
String fbAvatarUrl = "//Your URL";
BitmapManager.INSTANCE.loadBitmap(fbAvatarUrl, //Your ImageView, 60,60);
//60 60 is my desired height and width