There have been many posts asking for help with this error, but I could not find one that explained my scenario. I have the home screen of my app asking the user to enter a username that will correspond to the date/score of the game once it concludes. Obviously the score/date(time) the game is lost is unknown until the end, so only the username is being added to the DB on the front end, yet for some reason my code is generating a an error before the app even gets to the point of requesting the information.
Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
Code is below. I am still rather new to Android, so I'm not certain if perhaps the code is in the wrong place or being called at the wrong time.
This is the line that seems to be throwing the error.
protected void insertIntoDB(){
ContentValues cv = new ContentValues ();
cv.put (db.USERNAME, editTextName.toString ());
}
This is the line in context with the rest of the class.
public class Snake extends AppCompatActivity {
DBHandler db;
Calendar c = Calendar.getInstance ();
Date d = c.getTime();
private SnakeView mSnakeView;
private static String ICICLE_KEY = "snake-view";
private static Context mContext;
private EditText editTextName;
private Button btnAdd;
private Button btnLastFive;
private RelativeLayout mRelativeLayout;
private PopupWindow mPopupWindow;
/**
* Called when Activity is first created. Turns off the title bar, sets up
* the content views, and fires up the SnakeView.
*
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
mContext = getApplicationContext ( );
//set the layout
setContentView (R.layout.snake_layout_r);
db = new DBHandler (this);
editTextName = (EditText) findViewById (R.id.editTextName);
btnAdd = (Button) findViewById (R.id.btnAdd);
btnLastFive = (Button) findViewById (R.id.btnLastFive);
mSnakeView = (SnakeView) findViewById (R.id.snake);
mSnakeView.setTextView ((TextView) findViewById (R.id.text));
SimpleDateFormat dateFormat = new SimpleDateFormat ("MM/dd/yyyy");
String format = dateFormat.format (d);
if (savedInstanceState == null) {
// We were just launched -- set up a new game
mSnakeView.setMode (SnakeView.READY);
} else {
// We are being restored
Bundle map = savedInstanceState.getBundle (ICICLE_KEY);
if (map != null) {
mSnakeView.restoreState (map);
} else {
mSnakeView.setMode (SnakeView.PAUSE);
}
}
}
public static Context getAppContext() {
return mContext;
}
@Override
protected void onPause() {
super.onPause();
// Pause the game along with the activity
mSnakeView.setMode(SnakeView.PAUSE);
}
@Override
public void onSaveInstanceState(Bundle outState) {
//Store the game state
outState.putBundle(ICICLE_KEY, mSnakeView.saveState());
}
private Date currentdate(){
final Calendar cal = Calendar.getInstance ();
cal.add(Calendar.DATE, 0);
return cal.getTime ();
}
protected void insertIntoDB(){
ContentValues cv = new ContentValues ();
cv.put (db.USERNAME, editTextName.toString ());
}
public void lastFive(String[] args) {
List<User> list = new ArrayList<User> ( );
Collections.sort (list, User.Comparators._score);
}
public void onClick(View v) {
if(v == btnAdd){
insertIntoDB ();
} else if (v == btnLastFive){
// Initialize a new instance of LayoutInflater service
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
// Inflate the custom layout/view
View customView = inflater.inflate(R.layout.show_last_five,null);
/*
public PopupWindow (View contentView, int width, int height)
Create a new non focusable popup window which can display the contentView.
The dimension of the window must be passed to this constructor.
The popup does not provide any background. This should be handled by
the content view.
Parameters
contentView : the popup's content
width : the popup's width
height : the popup's height
*/
// Initialize a new instance of popup window
mPopupWindow = new PopupWindow(
customView,
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT
);
// Set an elevation value for popup window
// Call requires API level 21
if(Build.VERSION.SDK_INT>=21){
mPopupWindow.setElevation(5.0f);
}
// Get a reference for the custom view close button
ImageButton closeButton = (ImageButton) customView.findViewById(R.id.ib_close);
// Set a click listener for the popup window close button
closeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Dismiss the popup window
mPopupWindow.dismiss();
}
});
/*
public void showAtLocation (View parent, int gravity, int x, int y)
Display the content view in a popup window at the specified location. If the
popup window cannot fit on screen, it will be clipped.
Learn WindowManager.LayoutParams for more information on how gravity and the x
and y parameters are related. Specifying a gravity of NO_GRAVITY is similar
to specifying Gravity.LEFT | Gravity.TOP.
Parameters
parent : a parent view to get the getWindowToken() token from
gravity : the gravity which controls the placement of the popup window
x : the popup's x location offset
y : the popup's y location offset
*/
// Finally, show the popup window at the center location of root relative layout
mPopupWindow.showAtLocation(mRelativeLayout, Gravity.CENTER,0,0);
}
};
XML File
<?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:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Username"
android:id="@+id/textViewName"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editTextName"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/buttonStyleSmall"
android:text="Add"
android:id="@+id/btnAdd"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last 5 Games"
android:id="@+id/btnLastFive"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/text"
android:text="@string/snake_layout_text_text"
android:visibility="visible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:textColor="#ff8888ff"
android:textSize="24sp"/>
</RelativeLayout>
</LinearLayout>
I did not believe this to be a duplicate of the existing posts (which I did read) as none of the previous samples involved an input from user (my Edittext) or included that the error referenced a line of code that did not exist in my code (EditText.getText()) Perhaps it is my inexperience that leads the previous answer to not explain what is causing this error to be thrown, but the other question was not of help to me. Apologies for the inconvenience if this is truly a dup, that was not my intention.
