Android-从URL添加到rootview的位图
从url中提取位图时遇到了一些问题。我在堆栈中使用了另一个问题的示例,但它不会加载图像。代码如下:Android-从URL添加到rootview的位图,android,Android,从url中提取位图时遇到了一些问题。我在堆栈中使用了另一个问题的示例,但它不会加载图像。代码如下: public class Image extends Activity{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Bitmap bitmap
public class Image extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bitmap bitmap = DownloadImage("http://cogadget.com/cogadget/wp-content/uploads/2010/05/Android-Logo-50x50.jpg");
ImageView img = (ImageView) findViewById(R.id.imageView1);
img.setImageBitmap(bitmap);
}
private InputStream OpenHttpConnection(String urlString) throws IOException {
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try {
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (Exception ex) {
throw new IOException("Error connecting");
}
return in;
}
private Bitmap DownloadImage(String URL) {
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in);
in.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return bitmap;
}
}
我正在尝试使用url中的位图填充ImageView。我可以在模拟器上连接到internet,但在logcat中它告诉我它无法建立连接。我还在清单中为internet设置权限。这可能是一个简单的修复方法,我很惊讶。您正试图在UI线程上运行网络操作(http连接)。您应该看看threads&asynctasks:Quanturium回答的是一个开始。但是你真的应该发布日志,看看你遇到了什么问题。谢谢你给我指出了正确的方向。另外,我明天回去工作的时候一定会发布日志。当你的bug被修复了一周后,别忘了将这个主题标记为已解决。我现在又回到这个案子上了。线程和进程页面实际上是我的桌面背景。