如何在两个元素之间添加一个元素

Question

I am trying to add an editText in between two already existing editTexts programmatically on the click of a button in android. I am just wondering if this is possible, as i have been unable to find any related questions?

Answer 1

you can add 3rd EditText on 2nd position.

For that first you should have reference of the parent layout nad then do like this.

if you have done :

parent.addView(editText1);
parent.addView(editText2);

So now your parent have two child views.

now to add 3rd EditText ie editText3 then do this like:

parent.addView(editText3, 1);// addView(<childview>, <index>);

Like this your 3rd EditText will be in 2nd position.

Answer 2

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)yourEditBox.getLayoutParams();
params.addRule(RelativeLayout.LEFT_OF, R.id.id_to_be_left_of);
params.addRule(RelativeLayout.RIGHT_OF, R.id.id_to_be_right_of);

yourEditBox.setLayoutParams(params);

Use above code to add and align you're editbox between another two editboxes.

Answer 3

Inside Activity class

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    LinearLayout linearLayout = (LinearLayout) getLayoutInflater().inflate(R.layout.activity_main, null);
    setContentView(linearLayout);
    EditText editText = new EditText(getBaseContext());
    editText.setHint("Programmatically Added EditText");
    linearLayout.addView(editText, 1);
}}

Layout file structure

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">

   <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="EditText 1" />

   <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="EditText 2" />

</LinearLayout>

Hope this helps. Cheers!

Answer 4

You can just add this editText between the two in your xml file and controle visibility on your xml and the moment you click on your button.

In xml file :Set visibility to gone or invisible depending on what you actually want : android:visibility="invisible" it won't be visible but it's going to take place in your view android:visibility="gone" it won't be visible and it's not taking place in your view

In your code :

yourButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            yourButton.setVisibility(View.VISIBLE);

});

Answer 5

What do you want to acomplish with runtime element adding? Whats the purpose? Maybe isn't enough to show/hide the element on specific actions?

I mean you can make it gone (it will be invisible but also won't use space on the layout) in xml:

android:visibility="gone"

or in java code in the onCreate() method:

specificElement.setVisibility(View.GONE)

Then when you normally would add the element you rather just set the visibility to visible:

specificElement.setVisibility(View.VISIBLE)

What about that?