所以我一直在开发一个应用程序（遵循这个Tutorial）
现在，当我将minSdkVersion从8更改为11时，操作栏可以正常工作，除了一个活动外，一切都很好。虽然我在allproducts活动并选择其中一个产品来编辑它崩溃，但我相信这意味着问题出在editproductsactivity中，但我对android上的编程很新，所以我迷路了。当我将minSdkVersion设置为8时，它可以工作但由于某种原因，当我将它设置为11时，只有此活动停止工作。任何人都可以帮助我吗？
编辑：我在logcat中遇到的错误是
01-15 13:16:14.314: W/dalvikvm(13431): threadid=1: thread exiting with uncaught exception (group=0x416e2d28)
01-15 13:16:14.317: E/AndroidRuntime(13431): FATAL EXCEPTION: main
01-15 13:16:14.317: E/AndroidRuntime(13431): Process: com.example.androidhive, PID: 13431
01-15 13:16:14.317: E/AndroidRuntime(13431): android.os.NetworkOnMainThreadException
01-15 13:16:14.317: E/AndroidRuntime(13431): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
01-15 13:16:14.317: E/AndroidRuntime(13431): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
01-15 13:16:14.317: E/AndroidRuntime(13431): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
01-15 13:16:14.317: E/AndroidRuntime(13431): at libcore.io.IoBridge.connect(IoBridge.java:112)
01-15 13:16:14.317: E/AndroidRuntime(13431): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
01-15 13:16:14.317: E/AndroidRuntime(13431): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:460)
01-15 13:16:14.317: E/AndroidRuntime(13431): at java.net.Socket.connect(Socket.java:833)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
01-15 13:16:14.317: E/AndroidRuntime(13431): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
01-15 13:16:14.317: E/AndroidRuntime(13431): at com.example.androidhive.JSONParser.makeHttpRequest(JSONParser.java:62)
01-15 13:16:14.317: E/AndroidRuntime(13431): at com.example.androidhive.EditProductActivity$GetProductDetails$1.run(EditProductActivity.java:143)
01-15 13:16:14.317: E/AndroidRuntime(13431): at android.os.Handler.handleCallback(Handler.java:733)
01-15 13:16:14.317: E/AndroidRuntime(13431): at android.os.Handler.dispatchMessage(Handler.java:95)
01-15 13:16:14.317: E/AndroidRuntime(13431): at android.os.Looper.loop(Looper.java:137)
01-15 13:16:14.317: E/AndroidRuntime(13431): at android.app.ActivityThread.main(ActivityThread.java:5083)
01-15 13:16:14.317: E/AndroidRuntime(13431): at java.lang.reflect.Method.invokeNative(Native Method)
01-15 13:16:14.317: E/AndroidRuntime(13431): at java.lang.reflect.Method.invoke(Method.java:515)
01-15 13:16:14.317: E/AndroidRuntime(13431): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
01-15 13:16:14.317: E/AndroidRuntime(13431): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
01-15 13:16:14.317: E/AndroidRuntime(13431): at dalvik.system.NativeStart.main(Native Method)
提前谢谢你，
泰勒莫斯科夫答案 0 :(得分：1)
较旧版本的android允许在主线程上运行与网络相关的任务，但是他们改变了这一点，因为网络相关的任务可能比平时阻塞主线程需要更多的时间。所以在较新的版本中，它必须在不同的线程而不是主线程（也称为UI线程）上运行此类任务。
点击此页面查看解决此问题的代码 page
答案 1 :(得分：1)
试试这个。我将数据类型更改为JSONObject，正如我所说，在与用户界面组件交互时使用onPostExecute（）。您的代码中的问题是您从不同的线程“doInBackgroud（）”调用主线程“runOnUIthread（）”。
class GetProductDetails extends AsyncTask<String, JSONObject, JSONObject> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditProductActivity.this);
pDialog.setMessage("Loading product details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting product details in background thread
* */
protected JSONObject doInBackground(String... params) {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting product details by making HTTP request
// Note that product details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_product_detials, "GET", params);
// check your log for json response
Log.d("Single Product Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received product details
JSONArray productObj = json
.getJSONArray(TAG_PRODUCT); // JSON Array
// get first product object from JSON Array
JSONObject product = productObj.getJSONObject(0);
}else{
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(JSONObject result) {
// dismiss the dialog once got all details
pDialog.dismiss();
JSONObject product = result;
setContentView(R.layout.edit_product);
// product with this pid found
// Edit Text
txtName = (EditText) findViewById(R.id.inputName);
txtPrice = (EditText) findViewById(R.id.inputPrice);
txtDesc = (EditText) findViewById(R.id.inputDesc);
// display product data in EditText
txtName.setText(product.getString(TAG_NAME));
txtPrice.setText(product.getString(TAG_PRICE));
txtDesc.setText(product.getString(TAG_DESCRIPTION));
}
}