大佬教程收集整理的这篇文章主要介绍了Android：Http GET请求无法连接，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我正在使用Wei-Meng Lee的“Beginning Android Application Development”一书.代码编译并且没有标记错误,但每次运行程序时都会出现“错误连接”消息,并且不显示任何图像.
我查看了GET请求的各种代码示例,但找不到任何适用于我的代码的内容.
任何人都可以提供的任何帮助都将非常感激,因为到目前为止我正在努力寻找任何解决方案.
关于uses-permission的最后一行代码包含在Manifest中.
ImageView image; 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) { Toast.makeText(this,e1.getLocalizedmessage(),Toast.LENGTH_LONG).show(); e1.printStackTrace(); } return bitmap; } @Override public void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); setContentView(R.layout.activity_network); Bitmap bitmap = DownloadImage("http://www.mayoff.com/5-01cablecarDCP01934.jpg"); image = (ImageView) findViewById(R.id.imagE); image.setImageBitmap(bitmap); } <uses-permission android:name="android.permission.INTERNET" />
这可能与以下事实有关：在apis 11及以上访问主线程中的网络是不允许的,您可能必须使用ASYNC任务.
使用ASYNC任务的示例;
class InternetFileCheack extends AsyncTask<Object,Void,Boolean> { private Button btn; private String fileURL; Context c; public internetFileCheack (Button imv,String url,Context ctX) { this.btn = imv; this.fileURL = url; this.c = ctx; } @Override protected Boolean doInBACkground(Object... params) { Boolean sonuc = null; try { URL u = new URL(fileURL); httpURLConnection huc = (httpURLConnection) u.openConnection(); huc.setrequestMethod("HEAD"); huc.connect(); int code = huc.getResponseCode(); if (code == httpURLConnection.http_OK) { sonuc = true; } else { sonuc = false; } } catch (Exception E) { sonuc = false; } return sonuc; } @Override protected void onPostExecute(Boolean result) { btn.setEnabled(result); if (result) { Toast.makeText(c,"",Toast.LENGTH_LONG).show(); btn.setVisibility(View.VISIBLE); } else { btn.setVisibility(View.GONE); } } }
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