JSON字符串Java中的换行

Question

Don't know how to express myslef very well.As you see down in my code I have a String,an ArrayList of Strings and a spinner.

In my code I add the elements of my String in my ArrayList and then in my spinner. All good,except the fact that everything is on a single line,and I want each of the elements ("one,two,three,four") in a new line.

Note: I do not know what String accounts contain and how many values it has in it.

ArrayList<String> spinnerAccounts = new ArrayList<>();
String accounts = "one two three four";
Spinner accounts = (Spinner)findViewById(R.id.accounts);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,spinnerAccounts);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        accounts.setAdapter(adapter);
spinnerAccounts.add(System.lineSeparator());
                spinnerAccounts.add(accountID.toString());

Answer 1

Try below code.

 ArrayList<String> spinnerAccounts = new ArrayList<>(); // I don't know the use of this ArrayList
 Spinner accounts = (Spinner)findViewById(R.id.accounts);
 ArrayAdapter<String> adapter =
       new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,spinnerAccounts);
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 accounts.setAdapter(adapter);
 spinnerAccounts.add("one");
 spinnerAccounts.add("two");
 spinnerAccounts.add("three");
 spinnerAccounts.add("four");
 adapter.notifyDataSetChanged();

Add items you want to display in Spinner using spinnerAccounts.add("ACCOUNT_NAME") method.

Hope It'll help you.

Answer 2

Modify your string which will be shown in spinner like this

StringBuffer accounts = new StringBuffer("one");
stringBuffer.append("\n");
stringBuffer.append("two");
stringBuffer.append("\n");
stringBuffer.append("three");
stringBuffer.append("\n");
stringBuffer.append("four");

TextView in the spinner will populate the values in different lines provided height and width is wrap_content

Answer 3

Change ur code "accounts" used two times. Make arraylist for accounts and load into spinner.

    Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
    List<String> accountsList = new ArrayList<String>();
    accountsList.add("one");
    accountsList.add("two");
    accountsList.add("three");
    accountsList.add("four");

    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>
                 (this,android.R.layout.simple_spinner_item,accountsList);

    dataAdapter.setDropDownViewResource
                 (android.R.layout.simple_spinner_dropdown_item);

    spinner1.setAdapter(dataAdapter);

    // Spinner item selection Listener  
    addListenerOnSpinnerItemSelection();

    // Button click Listener 
    addListenerOnButton();

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