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J'ai modifié la question pour refléter la réponse. J'instançais un new Artists() chaque fois que la méthode getArtists() DatabaseHelper a été appelée. J'ai donc supprimé artists = new Artists(); dans getArtists() dans la classe DatabaseHelper. Au lieu de l'instancier immédiatement encore et encore, j'ai appris comment en utiliser le contexte dans le constructeur. Donc, je reçois la référence de Artists() dans le constructeur DatabaseHelper, comme ceci.ContextWrapper.getResources nullpointer lors de l'ajout de lignes à TableLayout
public DatabaseController(Context c){
myContext = c;
artists = (Artists) myContext;
}
// QUESTION ORIGINAL/CODE
Je reçois NPE à android.content.ContextWrapper.getResources(ContextWrapper.java:89) et je ne peux pas comprendre ce qui se passe. De nombreuses recherches ont montré que le problème est que getResources est appelé quelque part qui n'est pas surCreate, mais je n'appelle pas getResources n'importe où. J'essaie d'extraire des données de la base de données et de remplir par programme un TableLayout à partir de cette base de données.
Voici l'activité de l'artiste.
public class Artists extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private DatabaseController dbcon;
public TableLayout table;
public static int artistPopulateCatcher = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_artists);
table = (TableLayout)findViewById(R.id.table_artists);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_artists);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
if(artistPopulateCatcher == 0) {
dbcon = new DatabaseController(this);
dbcon.open();
dbcon.getArtists();
dbcon.close();
}
}
public void AddNewArtistDialog(View view) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
final View layout = LayoutInflater.from(this).inflate(R.layout.addartistdialog, null);
builder.setView(layout)
.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
final EditText name = (EditText) layout.findViewById(R.id.edittext_artist_name);
final EditText email = (EditText) layout.findViewById(R.id.edittext_artist_email);
final CheckBox is21 = (CheckBox) layout.findViewById(R.id.checkBox_is21);
String artistIs21;
String artistName;
String artistEmail;
if (is21.isChecked()){
artistIs21 = "Yes";
artistName = name.getText().toString();
artistEmail = email.getText().toString();
dbcon.open();
dbcon.AddArtist(artistName, artistIs21, artistEmail);
dbcon.close();
} else{
artistIs21 = "No";
artistName = name.getText().toString();
artistEmail = email.getText().toString();
dbcon.open();
dbcon.AddArtist(artistName, artistIs21, artistEmail);
dbcon.close();
}
dialog.cancel();
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
public void PopulateArtist(String artist, int draw, String is21, String email){
Log.d("TAG", artist+", "+draw+", "+is21);
TableRow tr = new TableRow(this);
tr.setLayoutParams(new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT));
TextView artistName = new TextView(this);
TextView artistDraw = new TextView(this);
TextView artistIs21 = new TextView(this);
TextView artistEmail = new TextView(this);
artistName.setText(artist);
artistDraw.setText(String.valueOf(draw));
artistIs21.setText(is21);
artistEmail.setText(email);
tr.addView(artistName);
tr.addView(artistDraw);
tr.addView(artistIs21);
tr.addView(artistEmail);
table.addView(tr, new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.MATCH_PARENT));
}
Mon contrôleur de base de données:
public class DatabaseController{
private DatabaseHelper dbHelper;
public Context myContext;
private SQLiteDatabase db;
public Artists artists;
public DatabaseController(Context c){
myContext = c;
}
public DatabaseController open() throws SQLException{
dbHelper = new DatabaseHelper(myContext);
db = dbHelper.getWritableDatabase();
return this;
}
public void close(){
dbHelper.close();
}
public void AddArtist(String name, String is21, String email){
ContentValues values = new ContentValues();
values.put(DatabaseHelper.KEY_NAME, name);
values.put(DatabaseHelper.KEY_IS21, is21);
values.put(DatabaseHelper.KEY_EMAIL, email);
values.put(DatabaseHelper.KEY_DRAW, 0);
db.insert(DatabaseHelper.TABLE_ARTISTS, null, values);
}
public Cursor getArtists() {
artists.artistPopulateCatcher = 1;
artists = new Artists();
Cursor cursor = db.rawQuery("SELECT * FROM Artists", null);
cursor.moveToFirst();
while (cursor.isAfterLast() == false){
String name = cursor.getString(cursor.getColumnIndex("Name"));
int draw = cursor.getInt(cursor.getColumnIndex("Draw"));
String is21 = cursor.getString(cursor.getColumnIndex("Is21"));
String email = cursor.getString(cursor.getColumnIndex("Email"));
artists.PopulateArtist(name, draw, is21, email);
cursor.moveToNext();
}
return cursor;
}
public int updateArtist(int _id, String artistName, int draw, String is21, String email){
ContentValues cv = new ContentValues();
cv.put(dbHelper.KEY_ID, _id);
cv.put(dbHelper.KEY_NAME, artistName);
cv.put(dbHelper.KEY_DRAW, draw);
cv.put(dbHelper.KEY_IS21, is21);
cv.put(dbHelper.KEY_EMAIL, email);
int i = db.update(dbHelper.TABLE_ARTISTS, cv, dbHelper.KEY_ID + " = "+_id, null);
return i;
}
}
Et voici le stacktrace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{scarycat.promotertools/scarycat.promotertools.Artists}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2237)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5137)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:718)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getResources(ContextWrapper.java:89)
at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:78)
at android.support.v7.app.AppCompatActivity.getResources(AppCompatActivity.java:542)
at android.view.View.<init>(View.java:3569)
at android.view.ViewGroup.<init>(ViewGroup.java:459)
at android.widget.LinearLayout.<init>(LinearLayout.java:168)
at android.widget.TableRow.<init>(TableRow.java:61)
at scarycat.promotertools.Artists.PopulateArtist(Artists.java:112)
at scarycat.promotertools.DatabaseController.getArtists(DatabaseController.java:53)
at scarycat.promotertools.Artists.onCreate(Artists.java:55)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2201)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2286)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5137)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:718)
at dalvik.system.NativeStart.main(Native Method)
Quelle est la ligne Artists.java:117 – USKMobility
TableRow tr = new TableRow (this); –
La méthode PopulateArtist est dans l'activité de l'artiste? – USKMobility