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How to add in this case elements to the ArrayList

i am runing the Code below but not happens. How can i doit right?
public class MainActivity extends AppCompatActivity {
LocationManager locationManager;
LocationListener locationListener;
List<String> memorablePlaces;
ListView listView;
}
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.memorablePlaces);
memorablePlaces = new ArrayList<>();
memorablePlaces.add("Add a place");
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1);
listView.setAdapter(arrayAdapter);
}

Pass your list to adapter:
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this,android.R.layout.simple_list_item_1, memorablePlaces);

Show the text from EditText on ListView

I have a button, an editText, and a listView on my project. The function I want to realize is that as I enter some words in editText and click the button, the words I typed need to be in the listView.
Here is my code. After debugging, it shows error: incompatible types: String cannot be converted to String[]
public class MainActivity extends AppCompatActivity {
private String[] str = new String[10];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.list_view); //build listview
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, str);
listView.setAdapter(adapter);
}
public void sendMessage(View view){
EditText editText = (EditText) findViewById(R.id.editText);
str = editText.getText().toString();
}
}

Below is working code for what you want.
step 1 -> Add data in edit text
step 2 -> click on submit button
step 3 -> Added data will display in listview
public class MainActivity extends AppCompatActivity {
private List<String> str = new ArrayList<>();
private ArrayAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = findViewById(R.id.list_view); //build listview
adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, str);
listView.setAdapter(adapter);
}
public void sendMessage(View view) {
EditText editText = findViewById(R.id.editText);
str.add(editText.getText().toString());
adapter.notifyDataSetChanged();
editText.setText("");
}
}

Try it this way
public class MainActivity extends AppCompatActivity {
private List<String> str = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.list_view); //build listview
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, str);
listView.setAdapter(adapter);
}
public void sendMessage(View view){
EditText editText = (EditText) findViewById(R.id.editText);
String str1 = editText.getText().toString();
str.add(str1);
}
}

error error: incompatible types: String cannot be converted to String[]
is because of str = editText.getText().toString();
here you are trying to assign string to array of string incorrectly
what you have to do is use ArrayList insted of String[] as it is dynamic and efficient than String[]
and
insted of str = editText.getText().toString(); do
arrayList.add(ditText.getText().toString());

In your case you are using String[] array with size 10.
now if you want to add string from EditText in ListView then you have to add like below.
public class MainActivity extends AppCompatActivity {
private String[] str = new String[10];
int count = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.list_view); //build listview
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, str);
listView.setAdapter(adapter);
}
public void sendMessage(View view){
EditText editText = (EditText) findViewById(R.id.editText);
if(count < str.length){
str[count] = editText.getText().toString();
count++;
}
}
}
Why you geeting error?
You get the error because you set the String array as a string. But if you want to add string in string array then you have to specify a position for array.

How to get the arraylist out android studio

I am unable to get my ArrayList out when it's on a different page. I would like to get the ArrayList out Android Studio.
This is CartActivity class:
public class CartActivity extends AppCompatActivity {
private ArrayList<CartItem> cartList;
ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
listView = (ListView) findViewById(R.id.listView);
CartAdapter adapter = null;
cartList = new ArrayList<>();
adapter = new CartAdapter(this, R.layout.adapter_cart_item, cartList);
listView.setAdapter(adapter);
}
}
This is ProductActivity class. It's where the data is being stored into the ArrayList:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product);
myDB = new DatabaseHelper(ProductActivity.this);
textViewPrice = (TextView) findViewById(R.id.textViewPrice);
textViewInfo = (TextView) findViewById(R.id.textViewInfo);
textViewName = (TextView) findViewById(R.id.textViewName);
ivProduct = (ImageView) findViewById(R.id.ivProduct);
btnAddToCart = (Button) findViewById(R.id.btnAddToCart);
spinnerQuantity = (Spinner) findViewById(R.id.spinnerQuantity);
Intent in = getIntent();
Bundle b = in.getExtras();
userID = b.getString("userID");
productID = b.getInt("productID");
Cursor results = myDB.checkProduct();
if (results.getCount() == 0) {
Toast.makeText(getApplicationContext(), "Error: no data found!",
Toast.LENGTH_SHORT).show();
return;
} else {
StringBuffer buffer = new StringBuffer();
while (results.moveToNext()) {
id = results.getInt(0);
name = results.getString(1);
price = results.getString(2);
info = results.getString(4);
quantity = Integer.parseInt(results.getString(5));
image = results.getBlob(6);
if (id == productID) {
textViewName.setText(name);
textViewInfo.setText(info);
textViewPrice.setText("S$" + price);
int[] quantityValues = new int[quantity + 1];
int counter = 0;
for (int i = 0; i < quantityValues.length; i++) {
quantityValues[i] = counter;
counter++;
quantityList.add(Integer.toString(quantityValues[i]));
}
Bitmap bitmap = BitmapFactory.decodeByteArray(image, 0, image.length);
ivProduct.setImageBitmap(bitmap);
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, quantityList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerQuantity.setAdapter(adapter);
}
}
}
}
public void addCart(View v) {
cartList.add(new CartItem(name, price,spinnerQuantity.getSelectedItem().toString(), image, id));
Intent productListIntent = new Intent(this, CartActivity.class);
startActivity(productListIntent);
}

You should impliment Serializable in CartItem class and then pass from ProductActivity to CartActivity . Like this :
ProductActivity class.
Intent productListIntent= new Intent(this, CartActivity .class);
productListIntent.putExtra("cartlist", ArrayList<CartItem>mcartItem);
startActivity(productListIntent);
and in CartActivity class
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
ArrayList<CartItem> mycart= new ArrayList<CartItem>();
mycart= (ArrayList<CartItem>)getIntent().getSerializableExtra("cartlist");
listView = (ListView) findViewById(R.id.listView);
CartAdapter adapter = null;
adapter = new CartAdapter(this, R.layout.adapter_cart_item, mycart);
listView.setAdapter(adapter);
}

It's not the best practice, but you can make your arrayList
public static ArrayList list;
Then you can access it from ather activity using {class_name}.list

You have to pass your list of your data via intent(as Intent is a message passing Object) From ! activity to another activity. For that you have to make that class Parcable or Serializable . How to make a class Parcable in andriod studio read this answer. Then put thah class into the intent that you are passing to startActivity() method like
intent.putParcelableArrayListExtra("key",your_list);
or
intent.putExtra("key",your_class)// incase of single object
then get it to the onCreate() method of second activity like
getIntent().getParcelableArrayListExtra("your_key")
or
getIntent().getParcelableExtra()// incase of single object
Hope it will help your

How to Implement KMP string seaching algorithm on my listview ...?

I have a listview and I want to add a search in listview using the algorithm KMP
How to Implement on my listView.
#Override
public void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView =(ListView) findViewById(R.id.list_istilah);
autoTv = (AutoCompleteTextView) findViewById(R.id.AutoTV);
db = DatabaseHelper.getInstance(this);
setData();
autoTv.addTextChangedListener(this);
listView.setOnItemClickListener(this);
}
private void setData()
{
listKamus = db.getAllKamus();
adapter = new ArrayAdapter<Kamus>(this,
android.R.layout.simple_expandable_list_item_1, listKamus);
listView.setAdapter(adapter);
}

Array adapter context

this is my code:
public class EnterActivity extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.enter);
Button search = (Button) findViewById(R.id.search);
search.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String[] answers = {
"das",
"das",
"dsa"
};
EditText eproduct = (EditText) findViewById(R.id.product);
EditText efactory = (EditText) findViewById(R.id.factory);
GridView grid = (GridView) findViewById(R.id.grid);
String product = eproduct.getText().toString();
String factory = efactory.getText().toString();
FrenchList french = new FrenchList();
int frenchResult = french.getCosher(product, factory);
//error is here
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, answers);
}
});
}}
the error is: "The constructor ArrayAdapter(new View.OnClickListener(){}, int, String[]) is undefined"
I did some searching on similar problems and I'm preety sure the problem is that i don't use the context properly, but to my understanding, as long as "this" appears in a class that extends activity I should be alright.
Why is this error showing? how can I fix it?

this refers to the View.OnClickListener class, which is an anonymous inner class in this example. You can use EnterActivity.this.