int size = mcq.size();
String arr[] = null;
int i;
{
for (i = 0; i < size; i++) {
if (op1.isPressed()) {
arr[i] = tv1.getText().toString();
// Log.e("Array",arr[i]);
} else if (op2.isPressed()) {
arr[i] = tv2.getText().toString();
//Log.e("Array",arr[i]);
} else if (op3.isPressed()) {
arr[i] = tv3.getText().toString();
// Log.e("Array",arr[i]);
} else if (op4.isPressed()) {
arr[i] = tv4.getText().toString();
//Log.e("Array",arr[i]);
}
I am trying to store the data in an array when the button is pressed,but it always shows null.And when the for loop is over I want to display my array.
here , Arrays in Java have a size so u cannot do like this. Instead of this
use list,
ArrayList<String> arr = new ArrayList<String>();
Inorder to do using String array :
String[] arr = new String[SIZEDEFNE HERE];
For ur answer :
ArrayList<String> arr = new ArrayList<String>();
int i;
{
for (i = 0; i < size; i++) {
if (op1.isPressed()) {
arr.add(tv1.getText().toString());
} else if (op2.isPressed()) {
arr.add(tv2.getText().toString());
} else if (op3.isPressed()) {
arr.add(tv3.getText().toString());
} else if (op4.isPressed()) {
arr.add(tv4.getText().toString());
}
Retrive value using
String s = arr.get(0);
This is because your string array is null. Declare it with the size as
String[] arr = new String[size];
Try Array List. use the following code in your main java
final ArrayList<String> list = new ArrayList<String>();
Button button= (Button) findViewById(R.id.buttonId);
final EditText editText = (EditText) findViewById(R.id.editTextId)
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
list.add(editText.getText().toString());
}
});
To avoid duplication in arraylist .You can use arraylist for faster then String array
ArrayList<String> list = new ArrayList<String>();
list.add("Krishna");
list.add("Krishna");
list.add("Kishan");
list.add("Krishn");
list.add("Aryan");
list.add("Harm");
System.out.println("List"+list);
HashSet hs = new HashSet();
hs.addAll(list);
list.clear();
list.addAll(hs);
Related
What kind of mistake did I make in my code?
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.update_activity);
etEname = findViewById(R.id.etEname);
etSalary = findViewById(R.id.etSalary);
rbMale = findViewById(R.id.rbMale);
rbFemale = findViewById(R.id.rbFemale);
cbWork = findViewById(R.id.cbWork);
spEno = findViewById(R.id.spEno);
//creation
helper = new DBHelper(this);
Cursor cursor = helper.readAll();
String arr [] = new String[0];
StringBuilder builder=new StringBuilder();
while(cursor.moveToNext()){
builder.append(cursor.getString(0)+" "+cursor.getString(1));
}
try {
for (int i = 0 ; i < cursor.getCount(); i++)
arr[i] = builder.toString();
ArrayAdapter<String> adapter = new ArrayAdapter<String>
(this, R.layout.custom, R.id.textView2,arr );
// Add adapter to spinner
spEno.setAdapter(adapter);
}
Simply put, I want to add specific data from the database name and id to spinner, what way?
Change this Line :
String arr [] = new String[cursor.getCount()];
builder.append(cursor.getString(0)+" "+cursor.getString(1));
to
int i =0;
arr[i] = cursor.getString(0)+" "+cursor.getString(1);
i++;
And Remove this things :
try {
for (int i = 0 ; i < cursor.getCount(); i++)
arr[i] = builder.toString();
You don't need a StringBuilder:
int i = 0;
while(cursor.moveToNext()){
arr[i++] = String.format("%s %s", cursor.getString(0), cursor.getString(1));
}
ArrayAdapter<String> adapter = new ArrayAdapter<String> (this, R.layout.custom, R.id.textView2,arr);
spEno.setAdapter(adapter);
i have made ListView with three columns 'item','qty','rate' i get this entries from the user and i have made the listview work perfectly but i want to get all the values of the 'rate' column and add them for the net amount.
Here is my android code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
populateList();
adapter = new listviewAdapter(List.this, list);
lview.setAdapter(adapter);
}
private void populateList() {
HashMap temp = new HashMap();
list = new ArrayList<HashMap>();
item = etItem.getText().toString();
qty = etQty.getText().toString();
rate = etRate.getText().toString();
temp.put(FIRST_COLUMN, "1");
temp.put(SECOND_COLUMN, item);
temp.put(THIRD_COLUMN, qty);
temp.put(FOURTH_COLUMN, rate);
list.add(temp);
}
I tried out this method below but it only toast the first value.But i want to get all the values under the rate column and add them up for the net-amount.
public void get() {
StringBuilder sb = new StringBuilder();
for(int i=0; i<adapter.getCount(); i++) {
String a = ((TextView) findViewById(R.id.FourthText)).getText().toString();
adapter.getItem(i).toString();
sb.append(a);
sb.append("\n");
}
text = sb.toString();
Toast.makeText(getApplicationContext(), text, Toast.LENGTH_LONG).show();
}
I think this might help you.
private int GrandTotal(ListView list) {
int sum=0;
for (int i = 0; i < list.getCount(); i++) {
View v = list.getChildAt(i);
TextView rate = (TextView) v.findViewById(R.id.rate);
sum = sum + Integer.parseInt(rate.getText().toString() )
}
return sum;
}
:)
public void getTotalRate() {
int totalRate = 0;
for (int i = 0; i < list.size(); i++) {
HashMap temp = list.get(i);
/// here fourth column is rate
int rate = (int) temp.get(FOURTH_COLUMN);
totalRate = totalRate + rate;
}
Toast.makeText(getApplicationContext(), "total rate=" + totalRate, Toast.LENGTH_LONG).show();
}
i have a problem, when i checked checkbox then click a button, the selected value of checkbox show in Toast. But i want to save the selected value to array. Can anyone help me ?
Here is my code
submit = (Button) findViewById(R.id.submit);
submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
StringBuffer responseText = new StringBuffer();
responseText.append("The following were selected...\n");
ArrayList<Planet> planetList = listAdapter.planetList;
for (int i = 0; i < planetList.size(); i++) {
Planet planet = planetList.get(i);
if (planet.isChecked()) {
responseText.append("\n" + planet.getName());
}
}
Toast.makeText(getApplicationContext(), responseText,
Toast.LENGTH_LONG).show();
}
});
// try this way,hope this will help you...
ArrayList<String> valuesList = new ArrayList<String>();
ArrayList<Planet> planetList = listAdapter.planetList;
for (int i = 0; i < planetList.size(); i++) {
Planet planet = planetList.get(i);
if (planet.isChecked()) {
valuesList.add(planet.getName());
responseText.append("\n" + planet.getName());
}
}
System.out.println("Selected Values List Size : "+valuesList.size());
String[] valueArray = new String[valuesList.size()];
for(int j=0;j<valuesList.size();j++){
valueArray[j]=valuesList.get(j);
}
System.out.println("Selected Values Array Size : "+valueArray.length);
i want add subitem in a listview. This is my code
ArrayList<String> mAllData;
private String [] cognomi = {
//my string
};
public void setData() {
mAllData = new ArrayList<String>();
mAdapter = new MySimpleSearchAdapter(this);
for (int i = 0; i < cognomi.length; i++) {
mAdapter.addItem(cognomi[i]);
mAllData.add(cognomi[i]);
}
You can use a pre-defined android layout for this: http://www.javajirawat.com/2013/03/android-listview-tutorial_12.html
Hi can some one suggest me a sample example of how i can sort the textviews based on the numbers in textviews. I am able to get the text from the TextViews need to sort and place the lowest number first.
Thank you.
public void sortNumbers(View v) {
String[] numbers = new String[7];
numbers[0] = textView23.getText().toString();
numbers[1] = textView33.getText().toString();
numbers[2] = textView43.getText().toString();
numbers[3] = textView53.getText().toString();
numbers[4] = textView63.getText().toString();
numbers[5] = textView73.getText().toString();
numbers[6] = textView83.getText().toString();
Integer[] intValues = new Integer[numbers.length];
for (int i = 0; i < numbers.length; i++) {
intValues[i] = Integer.parseInt(numbers[i].trim());
}
Collections.sort(Arrays.asList(intValues));
for (int i = 0; i < intValues.length; i++) {
Integer intValue = intValues[i];
//here I want to assign sorted numberes to the TextViews
}
}
So I have followed Jeffrey's advice. Here is the code which still doesn't work properly. What could be wrong?
Created an array of TextViews:
TextView[] tvs = new TextView[7];
tvs[0] = textView23;
tvs[1] = textView33;
tvs[2] = textView43;
tvs[3] = textView53;
tvs[4] = textView63;
tvs[5] = textView73;
tvs[6] = textView83;
Sorted the array and assinged new values to the TextViews:
Arrays.sort(tvs, new TVTextComparator());
textView23.setText(tvs[0].getText().toString());
textView33.setText(tvs[1].getText().toString());
textView43.setText(tvs[2].getText().toString());
textView53.setText(tvs[3].getText().toString());
textView63.setText(tvs[4].getText().toString());
textView73.setText(tvs[5].getText().toString());
textView83.setText(tvs[6].getText().toString());
And here is the Comporator class:
public class TVTextComparator implements Comparator<TextView> {
public int compare(TextView lhs, TextView rhs) {
Integer oneInt = Integer.parseInt(lhs.getText().toString());
Integer twoInt = Integer.parseInt(rhs.getText().toString());
return oneInt.compareTo(twoInt);
}
}
to sort your textViews, first put them in an array,
TextView[] tvs = new TextView[7];
tvs[0] = textView23;
tvs[1] = textView33;
// and so on
note that if you have handle to the parent container, you could easily build the array by using ViewGroup.getChildCount() and getChildAt().
now write a comparator for a text view,
class TVTextComparator implements Comparator<TextView> {
#Override
public int compare(TextView lhs, TextView rhs) {
return lhs.getText().toString().compareTo(rhs.getText().toString());
// should check for nulls here, this is NOT a robust impl of compare()
}
}
now use the comparator to sort the array,
Arrays.sort(tvs, 0, tvs.length, new TVTextComparator());
public void sortNumbers(View v) {
String[] numbers = new String[7];
numbers[0] = textView23.getText().toString();
numbers[1] = textView33.getText().toString();
numbers[2] = textView43.getText().toString();
numbers[3] = textView53.getText().toString();
numbers[4] = textView63.getText().toString();
numbers[5] = textView73.getText().toString();
numbers[6] = textView83.getText().toString();
Integer[] intValues = new Integer[numbers.length];
for (int i = 0; i < numbers.length; i++) {
intValues[i] = Integer.parseInt(numbers[i].trim());
}
Collections.sort(Arrays.asList(intValues));
textView23.setText(intValues[0]);
textView33.setText(intValues[1]);
textView43.setText(intValues[2]);
textView53.setText(intValues[3]);
textView63.setText(intValues[4]);
textView73.setText(intValues[5]);
textView83.setText(intValues[6]);
}