私のリストビューには、フィールド、病棟番号、および日付があります。リストビューをクリックしているときにこれらのデータを新しいアクティビティに取得したいのですが、これにはランタイムエラーがあり、修正方法がわかりません。
これは私のdashboardActivity.javaファイルです。
public class DashboardActivity extends ListActivity implements FetchDataListener{
UserFunctions userFunctions;
Button btnLogout;
TextView resultView;
private ProgressDialog dialog;
//private String email;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* Dashboard Screen for the application
* */
// Check login status in database
userFunctions = new UserFunctions();
if(userFunctions.isUserLoggedIn(getApplicationContext())){
setContentView(R.layout.dashboard);
initView();
ListView lv = getListView();
// listening to single list item on click
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// selected item
TextView txtviewWard= (TextView) view.findViewById(R.id.ward_number);
String ward = txtviewWard.getText().toString();
TextView txtviewDate= (TextView) view.findViewById(R.id.date_time);
String dateTime = txtviewDate.getText().toString();
// Launching new Activity on selecting single List Item
Intent i = new Intent(getApplicationContext(), SingleListItem.class);
// sending data to new activity
i.putExtra("ward", ward);
i.putExtra("dateTime", dateTime);
startActivity(i);
}
});
btnLogout = (Button) findViewById(R.id.btnLogout);
btnLogout.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
userFunctions.logoutUser(getApplicationContext());
Intent login = new Intent(getApplicationContext(), LoginActivity.class);
login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(login);
// Closing dashboard screen
finish();
}
});
}else{
// user is not logged in show login screen
Intent login = new Intent(getApplicationContext(), LoginActivity.class);
login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(login);
// Closing dashboard screen
finish();
}
}
private void initView() {
// show progress dialog
dialog = ProgressDialog.show(this, "", "Loading...");
Intent intent = getIntent();
String email = intent.getStringExtra(LoginActivity.EMAIL);
String url = "http://pubbapp.comze.com/pubapp1.php?email=" + email;
FetchDataTask task = new FetchDataTask(this);
task.execute(url);
}
public void onFetchComplete(List<Application> data) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// create new adapter
ApplicationAdapter adapter = new ApplicationAdapter(this, data);
// set the adapter to list
setListAdapter(adapter);
}
public void onFetchFailure(String msg) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
}
これは私の SingleListItem.java ファイルです。
public class SingleListItem extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.single_list_item_view);
TextView txtWard = (TextView) findViewById(R.id.ward_number);
TextView txtDate = (TextView) findViewById(R.id.date_time);
Intent i = getIntent();
// getting attached intent data
String wardNumber = i.getStringExtra("ward");
String dateTime = i.getStringExtra("dateTime");
// displaying selected product name
txtWard.setText(wardNumber);
txtDate.setText(dateTime);
}
これは私のxmlファイルです。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/ward_number"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip"
android:text="wardNumber"
android:textColor="#ffffff"
android:textSize="25dip"
android:textStyle="bold" />
<TextView
android:id="@+id/date_time"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Date"
android:padding="10dip"
android:textColor="#ffffff"
android:textSize="20dip"
android:textStyle="bold" />
</LinearLayout>
これは LogCat のエラーです。
12-02 19:10:01.100: E/AndroidRuntime(22705): FATAL EXCEPTION: main
12-02 19:10:01.100: E/AndroidRuntime(22705): java.lang.NullPointerException
12-02 19:10:01.100: E/AndroidRuntime(22705): at com.example.androidhive.DashboardActivity$1.onItemClick(DashboardActivity.java:59)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.widget.ListView.performItemClick(ListView.java:3745)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1980)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.os.Handler.handleCallback(Handler.java:587)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.os.Handler.dispatchMessage(Handler.java:92)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.os.Looper.loop(Looper.java:130)
12-02 19:10:01.100: E/AndroidRuntime(22705): at android.app.ActivityThread.main(ActivityThread.java:3691)
12-02 19:10:01.100: E/AndroidRuntime(22705): at java.lang.reflect.Method.invokeNative(Native Method)
12-02 19:10:01.100: E/AndroidRuntime(22705): at java.lang.reflect.Method.invoke(Method.java:507)
12-02 19:10:01.100: E/AndroidRuntime(22705): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
12-02 19:10:01.100: E/AndroidRuntime(22705): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
12-02 19:10:01.100: E/AndroidRuntime(22705): at dalvik.system.NativeStart.main(Native Method)
このエラーを修正するのを手伝ってください。ありがとうございました。