我使用asynctask将http发送到服务器。我把传递参数放到我的asynctask。这是我的asynctask
private class ProcessSend extends AsyncTask<String, Boolean, String> {
//private HttpClient mHc = new DefaultHttpClient();
HttpClient httpclient = new DefaultHttpClient();
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainPetakTetap.this);
pDialog.setMessage("Loading Send ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
publishProgress(true);
// Do the usual httpclient thing to get the result
String code = params[0];
String alamat = params[1];
String batas = params[2];
String lat = params[3];
String lon = params[4];
String luas = params[5];
String tglA = params[6];
String tglB = params[7];
String userId = params[8];
//Toast.makeText(MainPetakTetap.this, "response : " + name, Toast.LENGTH_LONG).show();
String url;
url = CGlobalConfig.getURLRcvrPetakTetap();
// Create a new HttpClient and Post Header
HttpPost httppost = new HttpPost(url);
//This is the data to send
//String MyName = "puja"; //any data to send
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("code", code));
nameValuePairs.add(new BasicNameValuePair("alamat", alamat));
nameValuePairs.add(new BasicNameValuePair("info_batas", batas));
nameValuePairs.add(new BasicNameValuePair("lat", lat));
nameValuePairs.add(new BasicNameValuePair("lon", lon));
nameValuePairs.add(new BasicNameValuePair("luas", luas));
nameValuePairs.add(new BasicNameValuePair("tgl_awal", tglA));
nameValuePairs.add(new BasicNameValuePair("tgl_akhir", tglB));
nameValuePairs.add(new BasicNameValuePair("user_id", userId));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String response = httpclient.execute(httppost, responseHandler);
//This is the response from a php application
final String reverseString = response;
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainPetakTetap.this, "response : " + reverseString, Toast.LENGTH_LONG).show();
}
});
//saveContact(code);
} catch (final ClientProtocolException e) {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainPetakTetap.this, "CPE response " + e.toString(), Toast.LENGTH_LONG).show();
}
});
// TODO Auto-generated catch block
} catch (final IOException e) {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainPetakTetap.this, "IOE response " + e.toString(), Toast.LENGTH_LONG).show();
}
});
// TODO Auto-generated catch block
}
// stop gps
lman.removeUpdates(locaListener);
constantsCursor.requery();
return null;
}
@Override
protected void onProgressUpdate(Boolean... progress) {
// line below coupled with
// getWindow().requestFeature(Window.FEATURE_INDETERMINATE_PROGRESS)
// before setContentView
// will show the wait animation on the top-right corner
MainPetakTetap.this.setProgressBarIndeterminateVisibility(progress[0]);
}
@Override
protected void onPostExecute(String result) {
publishProgress(false);
pDialog.dismiss();
// Do something with result in your activity
}
}
但是当显示进度对话框发送时，toast显示Succes但强制关闭。这是我的logcat
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): FATAL EXCEPTION: AsyncTask #1
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): java.lang.RuntimeException: An error occured while executing doInBackground()
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.os.AsyncTask$3.done(AsyncTask.java:200)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.lang.Thread.run(Thread.java:1019)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.ViewRoot.checkThread(ViewRoot.java:2932)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.ViewRoot.requestLayout(ViewRoot.java:629)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.widget.ScrollView.requestLayout(ScrollView.java:1299)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.view.View.requestLayout(View.java:8267)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.widget.AbsListView.requestLayout(AbsListView.java:1124)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:790)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:31)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.widget.CursorAdapter$MyDataSetObserver.onChanged(CursorAdapter.java:385)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:31)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.database.AbstractCursor.requery(AbstractCursor.java:97)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:548)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at hariff.ltis.petaktetap.MainPetakTetap$ProcessSend.doInBackground(MainPetakTetap.java:484)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at hariff.ltis.petaktetap.MainPetakTetap$ProcessSend.doInBackground(MainPetakTetap.java:1)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
03-25 11:57:40.320: ERROR/AndroidRuntime(5704): ... 4 more
如何解决这个问题？
将ui线程从后台的Do移动到onPostExecute？但是如何？
答案 0 :(得分：1)
您需要将对cursor.requerry的调用移动到onPostExecute。该游标绑定到列表适配器，因此它调用UI代码。你只能在主线程上做到这一点。
答案 1 :(得分：1)
而不是runOnUiThread()，只需返回错误消息并在onPostExecute()中捕获，然后您可以检查结果是否为null，如果不是，则显示Toast并做其他的事情。此外，最好移动
lman.removeUpdates(locaListener);
constantsCursor.requery();
到onPostExecute()。