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POHow to get ListView data from one activity to another using setOnClickListener
 

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  1. POHow to get ListView data from one activity to another using setOnClickListener
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    <p>In my listview there are to feilds,ward number and the date.i want to get these data to new activity when i'am clicking a listview.but in this there is a runtime error and i have no idea to how to fix it.</p> <p>this is my dashboardActivity.java file,</p> <pre><code>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&lt;?&gt; 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&lt;Application&gt; 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(); } } </code></pre> <p>this is my SingleListItem.java file,</p> <pre><code>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); } </code></pre> <p>this is my xml file,</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;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" /&gt; &lt;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" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>and this is the error in the LogCat,</p> <pre><code>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) </code></pre> <p>please help me to fix this error. thank you.</p>
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    1. COI didnt't read through the code but what about simply usign an `Intent`?
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      1. USAdam Arold
    2. CO`how to fix it` : read the stacktrace. check the indicated line. wonder why this exception happens at this specific line.
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      1. USnjzk2
 

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