我正在尝试在3.2 Android设备（Honeycomb）上运行我的应用程序。
不幸的是，每当我尝试使用EditCaseActivity编辑我的应用中列出的某个对象时，我的应用就会崩溃。 Logcat似乎告诉我StrictMode导致崩溃，但我已经在使用AsyncTask。
非常感谢任何形式的帮助！ ：）
我的朋友怀疑它与RunOnUiThread有关，但是尝试编辑代码的RunOnUiThread会在第126行和第127行中出现'params'错误。
EditCaseActivity.java
package com.pivestigator.cases;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.pivestigator.JSONParser;
import com.pivestigator.R;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class EditCaseActivity extends Activity {
EditText txtCaseName;
EditText txtCaseUser;
EditText txtCaseCategory;
EditText txtCreatedAt;
Button btnSave;
Button btnDelete;
String cid;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single case url
private static final String url_case_details = "http://nsecure.5gbfree.com/PIvestigator/case/get_case_details.php";
// url to update case
private static final String url_update_case = "http://nsecure.5gbfree.com/PIvestigator/case/update_case.php";
// url to delete case
private static final String url_delete_case = "http://nsecure.5gbfree.com/PIvestigator/case/delete_case.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_CASE = "case";
private static final String TAG_CID = "cid";
private static final String TAG_CASE_NAME = "case_name";
private static final String TAG_CASE_USER = "case_user";
private static final String TAG_CASE_CATEGORY = "case_category";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_case);
// save button
btnSave = (Button) findViewById(R.id.btnSave);
btnDelete = (Button) findViewById(R.id.btnDelete);
// getting case details from intent
Intent i = getIntent();
// getting case id (cid) from intent
cid = i.getStringExtra(TAG_CID);
// Getting complete case details in background thread
new GetCaseDetails().execute();
// save button click event
btnSave.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// starting background task to update case
new SaveCaseDetails().execute();
}
});
// Delete button click event
btnDelete.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// deleting case in background thread
new DeleteCase().execute();
}
});
}
/**
* Background Async Task to Get complete case details
* */
class GetCaseDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCaseActivity.this);
pDialog.setMessage("Loading case details. Please stare at spinner to increase loading speed...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting case details in background thread
* */
protected String doInBackground(String... params) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cid", cid));
// getting case details by making HTTP request
// Note that case details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_case_details, "GET", params);
// check your log for json response
Log.d("Single Case Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received case details
JSONArray caseObj = json
.getJSONArray(TAG_CASE); // JSON Array
// get first case object from JSON Array
JSONObject cases = caseObj.getJSONObject(0);
// case with this cid found
// Edit Text
txtCaseName = (EditText) findViewById(R.id.inputCaseName);
txtCaseUser = (EditText) findViewById(R.id.inputCaseUser);
txtCaseCategory = (EditText) findViewById(R.id.inputCaseCategory);
// display case data in EditText
txtCaseName.setText(cases.getString(TAG_CASE_NAME));
txtCaseUser.setText(cases.getString(TAG_CASE_USER));
txtCaseCategory.setText(cases.getString(TAG_CASE_CATEGORY));
}else{
// case with cid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
/**
* Background Async Task to Save case Details
* */
class SaveCaseDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCaseActivity.this);
pDialog.setMessage("Saving case ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving case
* */
protected String doInBackground(String... args) {
// getting updated data from EditTexts
String case_name = txtCaseName.getText().toString();
String case_user = txtCaseUser.getText().toString();
String case_category = txtCaseCategory.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair(TAG_CID, cid));
params.add(new BasicNameValuePair(TAG_CASE_NAME, case_name));
params.add(new BasicNameValuePair(TAG_CASE_USER, case_user));
params.add(new BasicNameValuePair(TAG_CASE_CATEGORY, case_category));
// sending modified data through http request
// Notice that update case url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_case,
"POST", params);
// check json success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent i = getIntent();
// send result code 100 to notify about case update
setResult(100, i);
finish();
} else {
// failed to update case
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once case updated
pDialog.dismiss();
}
}
/*****************************************************************
* Background Async Task to Delete Case
* */
class DeleteCase extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EditCaseActivity.this);
pDialog.setMessage("Deleting Case...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting case
* */
protected String doInBackground(String... args) {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cid", cid));
// getting case details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
url_delete_case, "POST", params);
// check your log for json response
Log.d("Delete Case", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// case successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about case deletion
setResult(100, i);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once case deleted
pDialog.dismiss();
}
}
}
Logcat输出：
09-05 15:13:17.250: D/All Cases:(4519): {"cases":[{"case_name":"1111","created_at":"2012-07-23 20:35:05","updated_at":"2012-07-24 01:08:41","case_category":"111111111111111","case_user":"1111111","cid":"10"},{"case_name":"c","created_at":"2012-07-23 23:12:36","updated_at":"0000-00-00 00:00:00","case_category":"action2","case_user":"a","cid":"11"},{"case_name":"Klara","created_at":"2012-07-23 23:15:30","updated_at":"0000-00-00 00:00:00","case_category":"i dont know wha","case_user":"Rara","cid":"12"},{"case_name":"chicken","created_at":"2012-07-24 00:58:43","updated_at":"2012-07-24 01:07:24","case_category":"DERPID 2","case_user":"Sherlock","cid":"13"},{"case_name":"derpy\t","created_at":"2012-07-24 01:13:24","updated_at":"2012-07-24 01:29:04","case_category":"blkchicken.chic","case_user":"Sherlock","cid":"14"}],"success":1}
09-05 15:13:33.340: D/AndroidRuntime(4519): Shutting down VM
09-05 15:13:33.340: W/dalvikvm(4519): threadid=1: thread exiting with uncaught exception (group=0x400ee760)
09-05 15:13:33.340: E/AndroidRuntime(4519): FATAL EXCEPTION: main
09-05 15:13:33.340: E/AndroidRuntime(4519): android.os.NetworkOnMainThreadException
09-05 15:13:33.340: E/AndroidRuntime(4519): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
09-05 15:13:33.340: E/AndroidRuntime(4519): at java.net.InetAddress.lookupHostByName(InetAddress.java:477)
09-05 15:13:33.340: E/AndroidRuntime(4519): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:277)
09-05 15:13:33.340: E/AndroidRuntime(4519): at java.net.InetAddress.getAllByName(InetAddress.java:249)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-05 15:13:33.340: E/AndroidRuntime(4519): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-05 15:13:33.340: E/AndroidRuntime(4519): at com.pivestigator.JSONParser.makeHttpRequest(JSONParser.java:62)
09-05 15:13:33.340: E/AndroidRuntime(4519): at com.pivestigator.cases.EditCaseActivity$GetCaseDetails$1.run(EditCaseActivity.java:131)
09-05 15:13:33.340: E/AndroidRuntime(4519): at android.os.Handler.handleCallback(Handler.java:587)
09-05 15:13:33.340: E/AndroidRuntime(4519): at android.os.Handler.dispatchMessage(Handler.java:92)
09-05 15:13:33.340: E/AndroidRuntime(4519): at android.os.Looper.loop(Looper.java:132)
09-05 15:13:33.340: E/AndroidRuntime(4519): at android.app.ActivityThread.main(ActivityThread.java:4126)
09-05 15:13:33.340: E/AndroidRuntime(4519): at java.lang.reflect.Method.invokeNative(Native Method)
09-05 15:13:33.340: E/AndroidRuntime(4519): at java.lang.reflect.Method.invoke(Method.java:491)
09-05 15:13:33.340: E/AndroidRuntime(4519): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
09-05 15:13:33.340: E/AndroidRuntime(4519): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
09-05 15:13:33.340: E/AndroidRuntime(4519): at dalvik.system.NativeStart.main(Native Method)
09-05 15:13:35.360: I/dalvikvm(4519): threadid=4: reacting to signal 3
09-05 15:13:35.370: I/dalvikvm(4519): Wrote stack traces to '/data/anr/traces.txt'
答案 0 :(得分：0)
错误发生在SaveCaseDetails类。
您正在使用makeHttpRequest函数内的UI线程上的函数doInBackground发出HTTP请求（我猜）。
即使代码在后台线程内;但是你在那里调用runOnUiThread，它将在UI线程上运行并导致此异常。
删除班级runOnUiThread的{{1}}内的doInBackground。
如果需要，请仅使用它来更新用户界面。
由于params重命名，将发生错误，因此通过更改行
来更改其名称 SaveCaseDetails
到
protected String doInBackground(String... params)
答案 1 :(得分：0)
将此更改为on post execute返回json对象作为结果并在那里运行
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received case details
JSONArray caseObj = json
.getJSONArray(TAG_CASE); // JSON Array
// get first case object from JSON Array
JSONObject cases = caseObj.getJSONObject(0);
// case with this cid found
// Edit Text
txtCaseName = (EditText) findViewById(R.id.inputCaseName);
txtCaseUser = (EditText) findViewById(R.id.inputCaseUser);
txtCaseCategory = (EditText) findViewById(R.id.inputCaseCategory);
// display case data in EditText
txtCaseName.setText(cases.getString(TAG_CASE_NAME));
txtCaseUser.setText(cases.getString(TAG_CASE_USER));
txtCaseCategory.setText(cases.getString(TAG_CASE_CATEGORY));
}else{
// case with cid not found
}