I am trying to pass an array list to another activity but it seems that is not enough. I searched all day to pass the array list with "intent" but with no success. I wrote a code for learning purposes. How to pass the data and show the Arraylist in a second activity?
The action button is btn_save. If you want further details let me know.
The code is in
MainActivity (first activity):
public class MainActivity extends AppCompatActivity {
ArrayList<String> addArray = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editTextOne = (EditText) findViewById(R.id.editTextOne);
final EditText editTextTwo = (EditText) findViewById(R.id.editTextTwo);
Button btn_showText = (Button) findViewById(R.id.buttonShow);
final TextView textView = (TextView) findViewById(R.id.textResults);
Button btn_refresh = (Button) findViewById(R.id.btn_refresh);
Button btn_close = (Button) findViewById(R.id.btn_close);
Button btn_save = (Button) findViewById(R.id.btn_save);
final ListView showMe = (ListView) findViewById(R.id.list_items);
btn_showText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String text = editTextOne.getText().toString();
String textTwo = editTextTwo.getText().toString();
if (text.length() == 0 || textTwo.length() == 0){
textView.setText("You must enter Name & Surname");
}else {
textView.setText(Html.fromHtml(
"<font color=\"red\">"+ text + "</font> " +
"<font color=\"blue\"><b>" + textTwo + " </b></font>"));
}
}
});
btn_refresh.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
startActivity(getIntent());
}
});
btn_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
System.exit(0);
}
});
btn_save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Context context = getApplicationContext();
// CharSequence mytext = "Hahahaha";
// int duration = Toast.LENGTH_SHORT;
// Toast toast = Toast.makeText(context,mytext,duration);
// toast.show();
String text = editTextOne.getText().toString();
String textTwo = editTextTwo.getText().toString();
String getInput = text + textTwo;
if (addArray.contains(getInput)){
Toast.makeText(getBaseContext(), "Item already Added!", Toast.LENGTH_LONG).show();
}
else if (getInput == null || getInput.trim().equals("")){
Toast.makeText(getBaseContext(), "Input field is empty", Toast.LENGTH_LONG).show();
}
else{
addArray.add(getInput);
ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, addArray);
showMe.setAdapter(adapter);
Intent intent = new Intent(MainActivity.this, ListOfNames.class);
((EditText)findViewById(R.id.editTextOne)).setText(" ");
((EditText)findViewById(R.id.editTextTwo)).setText(" ");
}
}
});
}
public void onButtonClick(View v){
if (v.getId() == R.id.btn_list){
Intent i = new Intent(MainActivity.this, ListOfNames.class);
startActivity(i);
}
}
}
ListOfNames second activity: (almost empty)
public class ListOfNames extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_screen);
}
}
If you are trying to pass a arraylist of string then it will be easy. Just pass arraylist with intent like this:
ArrayList<String> list = new ArrayList<String>();
Intent intent = new Intent(ActivityOne.this, ActivityTwo.class);
intent.putStringArrayListExtra("key", list);
startActivity(intent);
And receive it in ActivityTwo like this:
ArrayList<String> list = getIntent().getStringArrayListExtra("key");
I found a temporary solution for this (The app is not broke). The only problem is the arraylist didn't increased. It contains and show only the last value.
Main Activity:
...
else{
// addArray.add(getInput);
// ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, addArray);
// showMe.setAdapter(adapter);
Intent intent = new Intent(MainActivity.this, ListOfNames.class);
intent.putExtra("data", getInput);
startActivity(intent);
// ((EditText)findViewById(R.id.editTextOne)).setText(" ");
// ((EditText)findViewById(R.id.editTextTwo)).setText(" ");
}
...
ListOfNames (Second Activity):
public class ListOfNames extends Activity {
ArrayList<String> addArrayT = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_screen);
Bundle bundle = getIntent().getExtras();
String data = bundle.getString("data");
Button btn_more = (Button) findViewById(R.id.btn_more);
ListView showMe = (ListView) findViewById(R.id.list_items);
addArrayT.add(data);
ArrayAdapter<String> adapterT = new ArrayAdapter<>(ListOfNames.this, android.R.layout.simple_list_item_1, addArrayT);
showMe.setAdapter(adapterT);
}
public void onClickMore(View v){
if (v.getId() == R.id.btn_more){
Intent i = new Intent(ListOfNames.this, MainActivity.class);
startActivity(i);
}
}
}
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