Android 将位图设置为NetworkImageView
我正在动态创建ImageView并显示它。但我在滚动时遇到了重新加载问题,所以我决定使用NetworkImageView,但在这里我无法设置位图。它没有显示任何错误,但没有显示任何图像。 在我的代码下面Android 将位图设置为NetworkImageView,android,networkimageview,Android,Networkimageview,我正在动态创建ImageView并显示它。但我在滚动时遇到了重新加载问题,所以我决定使用NetworkImageView,但在这里我无法设置位图。它没有显示任何错误,但没有显示任何图像。 在我的代码下面 final NetworkImageView imageView = new NetworkImageView(context); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(150,
final NetworkImageView imageView = new NetworkImageView(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(150,
200);
params.weight = 1;
//imageView.setImageBitmap(null);
imageView.setLayoutParams(params);
imageView.setMaxHeight(200);
imageView.setMaxWidth(150);
// bitmap =//
// BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_menu_folder);
// Log.i("Bitmaps Counts", String.valueOf(pos));
/* comment all this...
new Thread() {
public void run() {
bitmap = downloadImage(tempValues.getItemAbsolutePath());
((Activity) context).runOnUiThread(new Runnable() {
@Override
public void run() {
imageView.setImageBitmap(bitmap);
}
});
}
}.start();*/
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
ImageLoader mImageLoader = new ImageLoader(requestQueue,new LruBitmapCache(1000000));
mImageLoader.get(tempValues.getItemAbsolutePath(),
ImageLoader.getImageListener(imageView,
R.android.defaultimg,
R.android.errorimg));
layout.addView(imageView);
下载图像代码
/* unused method
private Bitmap downloadImage(String url) {
Bitmap bitmap = null;
InputStream stream = null;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
try {
stream = getHttpConnection(url);
bitmap = BitmapFactory.decodeStream(stream, null, bmOptions);
stream.close();
} catch (IOException e1) {
e1.printStackTrace();
}
return bitmap;
}
private InputStream getHttpConnection(String urlString) throws IOException {
InputStream stream = null;
URL url = new URL(urlString);
URLConnection connection = url.openConnection();
try {
HttpURLConnection httpConnection = (HttpURLConnection) connection;
httpConnection.setRequestMethod("GET");
httpConnection.connect();
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
stream = httpConnection.getInputStream();
}
} catch (Exception ex) {
ex.printStackTrace();
}
return stream;
}*/
错误日志
05-12 19:11:13.971:E/AndroidRuntime(11177):致命异常:线程7325
05-12 19:11:13.971:E/AndroidRuntime(11177):进程:com.dar.app,PID:11177
05-12 19:11:13.971:E/AndroidRuntime(11177):java.lang.NegativeArraySizeException:-350
05-12 19:11:13.971:E/AndroidRuntime(11177):位于com.android.volley.toolbox.DiskBasedCache.streamToBytes(DiskBasedCache.java:316)
05-12 19:11:13.971:E/AndroidRuntime(11177):位于com.android.volley.toolbox.DiskBasedCache.get(DiskBasedCache.java:117)
05-12 19:11:13.971:E/AndroidRuntime(11177):在com.android.volley.CacheDispatcher.run(CacheDispatcher.java:100)最终代码
public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
private ImageView imageView;
private Bitmap image;
private LinearLayout linear;
public DownloadImageTask(ImageView imageView, LinearLayout linear) {
this.imageView = imageView;
this.linear = linear;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
try {
InputStream in = new java.net.URL(urldisplay).openStream();
image = BitmapFactory.decodeStream(in);
} catch (Exception e) {
image = null;
}
return image;
}
@SuppressLint("NewApi")
protected void onPostExecute(Bitmap result) {
if (result != null) {
imageView.setImageBitmap(result);
linear.addView(imageView);
}
}
}
您可以使用截击图像降阶器
很容易
默认img已设置…加载程序请求图像。。
如果使用url找到图像,它将设置..或者如果出现错误,它将设置错误图像..这样您将在加载img时通知错误
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
ImageLoader mImageLoader = new ImageLoader(requestQueue,new LruBitmapCache(1000000));
mImageLoader.get(<img-url>,
ImageLoader.getImageListener(<imageview-object>,
R.drawable.defaultimg,
R.drawable.errorimg));
RequestQueue RequestQueue=Volley.newRequestQueue(getApplicationContext());
ImageLoader mImageLoader=新的ImageLoader(请求队列,新的lRubitMacache(1000000));
mImageLoader.get(,
ImageLoader.getImageListener(,
R.drawable.defaultimg,
R.drawable.errorimg);
我是android新手,至少请指导我。请检查我更新的代码,我正在做的是动态创建并传递给holder。下面的代码我不明白它是否有效?如果是,请增加我的答案。谢谢,我不明白。如果我在滚动列表时使用Imageview,它将再次重新下载图像,并且图像位置正在更改。如果您不使用对象,则是。您可以做的是使用图像缓存。()或者在您存储参考图像的对象列表中。@先生,如果这段编辑过的代码有效……那么我将更新我的答案……要接受这个问题的答案……在futureR.android.defaultimg for android中对其他人来说这很容易。我遇到了错误,因为我在Adapter中实现了一些默认和错误的图像……并将其命名为我所做的用于代码…并将“R.android”更改为“R.drawable”。。此外,我已经更新了代码OMG,非常感谢:),但如果我滚动两到三次,它将关闭应用程序
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
ImageLoader mImageLoader = new ImageLoader(requestQueue,new LruBitmapCache(1000000));
mImageLoader.get(<img-url>,
ImageLoader.getImageListener(<imageview-object>,
R.drawable.defaultimg,
R.drawable.errorimg));