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我的应用程序中包含3个片段，所述第一出现从外部数据的基础上填充的ListFragment，第二显示在地图和用于添加报告到数据库中的TH-IR，这是我的代码：ViewPager片段
MainActivity的代码：
package info.androidhive.tabsswipe;
import info.androidhive.tabsswipe.adapter.TabsPagerAdapter;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "My interventions", "MAP", "My report" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
}
ListFragment代码：
package info.androidhive.tabsswipe;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
public class TopRatedFragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.fragment_top_rated,
container, false);
return myFragmentView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
ArrayList<HashMap<String, String>> interventionsList;
// Progress Dialog
private ProgressDialog pDialog;
// url to get all interventions list
private static String url_all_interventions = "http://10.0.2.2/Scripts/liste_interventions.php";
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
// interventions JSONArray
JSONArray interventions = null;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
this.getListView().setTextFilterEnabled(true);
// Hashmap for ListView
interventionsList = new ArrayList<HashMap<String, String>>();
// Loading interventions in Background Thread
new LoadAllInterventions().execute();
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllInterventions extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading interventions. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONArray json = jParser.makeHttpRequest(url_all_interventions, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Interventions: ", json.toString());
try {
// Getting Array of interventions
JSONArray interventions = json;
// looping through All interventions
for (int i = 0; i < interventions.length(); i++) {
JSONObject c = interventions.getJSONObject(i);
// Storing each json item in variable
String id = c.getString("id");
String name = c.getString("name");
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put("Int_id", id);
map.put("Int_name", name);
// adding HashList to ArrayList
interventionsList.add(map);
}
} catch (JSONException e) {e.printStackTrace();}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
getActivity(), interventionsList,
R.layout.list_item, new String[] { "Int_id",
"Int_name"},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
Log.e("LIST", "setListAdapter is done");
}
});
}
}
public void runOnUiThread(Runnable runnable) {
// TODO Auto-generated method stub
}
}
MoviesFragment代码：
package info.androidhive.tabsswipe;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class MoviesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.fragment_movies,
container, false);
return myFragmentView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Button ajout=(Button)getActivity().findViewById(R.id.button1);
ajout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
EditText code=(EditText)getActivity().findViewById(R.id.editText1);
EditText lib=(EditText)getActivity().findViewById(R.id.editText2);
EditText desc=(EditText)getActivity().findViewById(R.id.editText3);
EditText st=(EditText)getActivity().findViewById(R.id.editText4);
EditText act=(EditText)getActivity().findViewById(R.id.editText5);
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().permitNetwork().build());
StringBuffer adresse= new StringBuffer("http://10.0.2.2:8080/Scripts/Create_Rapport.php?");
adresse.append("code="+code.getText().toString());
adresse.append("&lib="+lib.getText().toString());
adresse.append("&desc="+desc.getText().toString());
adresse.append("&state="+st.getText().toString());
adresse.append("&action="+act.getText().toString());
getPage(adresse.toString());
}});
}
public void getPage(String adresse) {
new Requete().execute(adresse);
}
private class Requete extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String response = "";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
}
catch (Exception e) {
e.printStackTrace();
}
}
return response;
}
}
}
JSONParser的代码：
package info.androidhive.tabsswipe;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONArray jArr = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONArray makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON array
try {
jArr = new JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jArr;
}
}
TabsViewPager类的代码：
package info.androidhive.tabsswipe.adapter;
import info.androidhive.tabsswipe.GamesFragment;
import info.androidhive.tabsswipe.MoviesFragment;
import info.androidhive.tabsswipe.TopRatedFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Top Rated fragment activity
return new TopRatedFragment();
case 1:
// Games fragment activity
return new GamesFragment();
case 2:
// Movies fragment activity
return new MoviesFragment();
}
return null;
}
@Override
public int getCount() {
// get item count - equal to number of tabs
return 3;
}
}
，这是第三片段的代码：
package info.androidhive.tabsswipe;
import info.androidhive.tabsswipe.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class GamesFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_games, container, false);
return rootView;
}
}
而且这是movies_fragment布局的代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#99E7E5"
android:orientation="vertical">
<Button
android:id="@+id/btnCreateRapport"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Créer Rapport" />
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:text="Nom de l'intervention"
android:textSize="17dip" />
<TextView
android:id="@+id/textView4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView2"
android:layout_marginTop="19dp"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:text="Etat"
android:textSize="17dip" />
<TextView
android:id="@+id/textView2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="20dp"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:text="Description"
android:textSize="17dip" />
<EditText
android:id="@+id/inputAction"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputState"
android:layout_margin="5dip"
android:ems="10"
android:singleLine="true" />
<TextView
android:id="@+id/textView3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView4"
android:layout_marginTop="16dp"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:text="Action corrective"
android:textSize="17dip" />
<TextView
android:id="@+id/textView5"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView3"
android:layout_marginTop="17dp"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:paddingTop="10dip"
android:text="Date"
android:textSize="17dip" />
<EditText
android:id="@+id/inputState"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputName"
android:layout_margin="5dip"
android:ems="10"
android:singleLine="true" />
<EditText
android:id="@+id/inputDesc"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputAction"
android:layout_margin="5dip"
android:ems="10"
android:singleLine="true" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/inputDate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputDesc"
android:layout_margin="5dip"
android:ems="10"
android:inputType="numberDecimal"
android:singleLine="true" />
<EditText
android:id="@+id/inputName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_margin="5dip"
android:ems="10"
android:singleLine="true" />
</RelativeLayout>
当我运行应用程序，第一个片段不会出现从数据库列表，当我刷到其他片段，关闭应用程序，这其中出现在logcat中：
I/Choreographer(1708): Skipped 38 frames! The application may be doing too much work on its main thread.
10-26 21:54:30.778:
D/All Interventions:(1708): [{"id":"2","name":"request 2"},{"id":"1","name":"request 1"}]
10-26 21:54:44.788:
I/Choreographer(1708): Skipped 60 frames! The application may be doing too much work on its main thread.
10-26 21:54:48.671:
D/AndroidRuntime(1708): Shutting down VM
10-26 21:54:48.671:
W/dalvikvm(1708): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-26 21:54:48.948:
E/AndroidRuntime(1708): FATAL EXCEPTION: main
10-26 21:54:48.948:
E/AndroidRuntime(1708): java.lang.NullPointerException
10-26 21:54:48.948:
E/AndroidRuntime(1708): at info.androidhive.tabsswipe.MoviesFragment.onActivityCreated(MoviesFragment.java:41)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1486)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:550)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:509)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:490)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at info.androidhive.tabsswipe.MainActivity.onTabSelected(MainActivity.java:70)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at com.android.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:579)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at com.android.internal.app.ActionBarImpl$TabImpl.select(ActionBarImpl.java:1081)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at com.android.internal.widget.ScrollingTabContainerView$TabClickListener.onClick(ScrollingTabContainerView.java:519)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.view.View.performClick(View.java:4204)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.view.View$PerformClick.run(View.java:17355)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.os.Handler.handleCallback(Handler.java:725)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.os.Handler.dispatchMessage(Handler.java:92)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.os.Looper.loop(Looper.java:137)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at java.lang.reflect.Method.invokeNative(Native Method)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at java.lang.reflect.Method.invoke(Method.java:511)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-26 21:54:48.948:
E/AndroidRuntime(1708): at dalvik.system.NativeStart.main(Native Method)
请有任何想法吗？