Add and Remove Views in Android Dynamically?

Question

How do I add and remove views such as TextViews from Android app like on the original stock Android contacts screen where you press a small icon on the right side of a field and it adds or deletes a field which consists of a TextView and an editTextView (from what I can see).

Any examples on how to achieve this?

Answer 1

//MainActivity :





 package com.edittext.demo;
    import android.app.Activity;
    import android.os.Bundle;
    import android.text.TextUtils;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.LinearLayout;
    import android.widget.Toast;

    public class MainActivity extends Activity {

        private EditText edtText;
        private LinearLayout LinearMain;
        private Button btnAdd, btnClear;
        private int no;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            edtText = (EditText)findViewById(R.id.edtMain);
            btnAdd = (Button)findViewById(R.id.btnAdd);
            btnClear = (Button)findViewById(R.id.btnClear);
            LinearMain = (LinearLayout)findViewById(R.id.LinearMain);

            btnAdd.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (!TextUtils.isEmpty(edtText.getText().toString().trim())) {
                        no = Integer.parseInt(edtText.getText().toString());
                        CreateEdittext();
                    }else {
                        Toast.makeText(MainActivity.this, "Please entere value", Toast.LENGTH_SHORT).show();
                    }
                }
            });

            btnClear.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LinearMain.removeAllViews();
                    edtText.setText("");
                }
            });

            /*edtText.addTextChangedListener(new TextWatcher() {
                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {

                }
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count,int after) {
                }
                @Override
                public void afterTextChanged(Editable s) {
                }
            });*/

        }

        protected void CreateEdittext() {
            final EditText[] text = new EditText[no];
            final Button[] add = new Button[no];
            final LinearLayout[] LinearChild = new LinearLayout[no];
            LinearMain.removeAllViews();

            for (int i = 0; i < no; i++){

                View view = getLayoutInflater().inflate(R.layout.edit_text, LinearMain,false);
                text[i] = (EditText)view.findViewById(R.id.edtText);
                text[i].setId(i);
                text[i].setTag(""+i);

                add[i] = (Button)view.findViewById(R.id.btnAdd);
                add[i].setId(i);
                add[i].setTag(""+i);

                LinearChild[i] = (LinearLayout)view.findViewById(R.id.child_linear);
                LinearChild[i].setId(i);
                LinearChild[i].setTag(""+i);

                LinearMain.addView(view);

                add[i].setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {
                        //Toast.makeText(MainActivity.this, "add text "+v.getTag(), Toast.LENGTH_SHORT).show();
                        int a = Integer.parseInt(text[v.getId()].getText().toString());
                        LinearChild[v.getId()].removeAllViews();
                        for (int k = 0; k < a; k++){

                            EditText text = (EditText) new EditText(MainActivity.this);
                            text.setId(k);
                            text.setTag(""+k);

                            LinearChild[v.getId()].addView(text);
                        }
                    }
                });
            }
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }

    }

// Now add xml main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:orientation="horizontal" >

    <EditText
        android:id="@+id/edtMain"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_weight="1"
        android:ems="10"
        android:hint="Enter value" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/btnAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="Add" />

    <Button
        android:id="@+id/btnClear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:text="Clear" />
</LinearLayout>

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp" >

    <LinearLayout
        android:id="@+id/LinearMain"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    </LinearLayout>
</ScrollView>

// now add view xml file..

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:orientation="horizontal" >

    <EditText
        android:id="@+id/edtText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:ems="10" />

    <Button
        android:id="@+id/btnAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="Add" />
</LinearLayout>

<LinearLayout
    android:id="@+id/child_linear"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="30dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="5dp"
    android:orientation="vertical" >
</LinearLayout>

Answer 2

This is my general way:

View namebar = view.findViewById(R.id.namebar);
ViewGroup parent = (ViewGroup) namebar.getParent();
if (parent != null) {
    parent.removeView(namebar);
}

Answer 3

Just use myView.setVisibility(View.GONE); to remove it completely. But if you want to reserve the occupied space inside its parent use myView.setVisibility(View.INVISIBLE);

Answer 4

Hi You can try this way by adding relative layout and than add textview in that.

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
            (LayoutParams.WRAP_CONTENT), (LayoutParams.WRAP_CONTENT));

RelativeLayout relative = new RelativeLayout(getApplicationContext());
relative.setLayoutParams(lp);

TextView tv = new TextView(getApplicationContext());
tv.setLayoutParams(lp);

EditText edittv = new EditText(getApplicationContext());
edittv.setLayoutParams(lp);

relative.addView(tv);
relative.addView(edittv);

Answer 5

For Adding the Button

LinearLayout dynamicview = (LinearLayout)findViewById(R.id.buttonlayout);
LinearLayout.LayoutParams  lprams = new LinearLayout.LayoutParams(  LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);

Button btn = new Button(this);
btn.setId(count);
final int id_ = btn.getId();
btn.setText("Capture Image" + id_);
btn.setTextColor(Color.WHITE);
btn.setBackgroundColor(Color.rgb(70, 80, 90));
dynamicview.addView(btn, lprams);
btn = ((Button) findViewById(id_));
btn.setOnClickListener(this);

For removing the button

ViewGroup layout = (ViewGroup) findViewById(R.id.buttonlayout);
View command = layout.findViewById(count);
layout.removeView(command);

Answer 6

ViewGroup class provides API for child views management in run-time, allowing to add/remove views as well.

Some other links on the subject:

Android, add new view without XML Layout

Android Runtime Layout Tutorial

http://developer.android.com/reference/android/view/View.html

http://developer.android.com/reference/android/widget/LinearLayout.html