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Android – removing layout programmatically

Posted by: admin June 15, 2020 Leave a comment

Questions:

I have an activity that makes a layout programmatically from a Shared Preference using a for loop. The text views and buttons are enclosed in a linear layout. The user can input as many views as he wants. Now, the button will be a delete button. When pressed, I want to delete the linear layout the button and the other textviews are contained. How do I do this?

HERE IS MY CODE:

package com.dirkjan.myschools;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {

LinearLayout subjectLeft, subjectRight;

Button addSubj;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    subjectLeft = (LinearLayout) findViewById(R.id.llSubjectLeft);
    subjectRight = (LinearLayout) findViewById(R.id.llSubjectRight);

    //Load the saved subjects
    SharedPreferences getSubjects = getSharedPreferences("SubjectInfo_Prefs", MODE_PRIVATE);
    SharedPreferences.Editor editor = getSubjects.edit();

    int subjectCount = getSubjects.getInt("count", 0);
    if (subjectCount > 0 ){
        for (int i = 1; i <= subjectCount; i++){
            //Set the linear layout for each subject
            LinearLayout ll = new LinearLayout(this);
            ll.setOrientation(LinearLayout.VERTICAL);
            LinearLayout.LayoutParams llParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

            float scale = getResources().getDisplayMetrics().density;
            //SET BOTTOM MARGIN
            float margin = 5; //RESIZE MARGIN HERE!
            int margs = (int) (margin * scale + 0.5f);

            //SET PADDING IN DP
            float padding = 5; //RESIZE PADDING HERE!
            int pads = (int) (padding * scale +0.5f);
            llParams.setMargins(0,0,0,margs);

            //SETTING THE LINEARLAYOUT PARAMS
            ll.setLayoutParams(llParams);
            ll.setPadding(pads, pads, pads, pads);

            //SETTING THE BACKGROUND COLOR OF THE LINEAR LAYOUT
            String chosenColor = getSubjects.getString("chosenColor" + i, "BLUE");

            if (chosenColor.equals("Green")){
                ll.setBackgroundResource(R.color.HoloGreen);
            }else if (chosenColor.equals("Blue")){
                ll.setBackgroundResource(R.color.HoloBlue);
            }else if (chosenColor.equals("Gray")){
                ll.setBackgroundResource(R.color.HoloGray);
            }else if (chosenColor.equals("Orange")){
                ll.setBackgroundResource(R.color.HoloOrange);
            }else {
                ll.setBackgroundResource(R.color.HoloYellow);
            }

            //ADDING THE LAYOUT TO THE APPROPRIATE CONTAINER (LEFT OR RIGHT)
            if (i % 2 == 1){
                subjectLeft.addView(ll);
            } else {
                subjectRight.addView(ll);
            }

            //SETTING THE SUBJECT NAME TEXTVIEW
            TextView SubjectName = new TextView(this);
            SubjectName.setText(getSubjects.getString("subjectName" + i, "Error"));
            SubjectName.setLayoutParams(new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT));
            SubjectName.setTextSize(22);
            SubjectName.setTypeface(Typeface.DEFAULT_BOLD);

            //SETTING THE SUBJECT NUMB TEXT VIEW
            TextView SubjectNumber = new TextView(this);
            SubjectNumber.setText(getSubjects.getString("subjectNumb" + i, "Error"));
            SubjectNumber.setLayoutParams(new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT));
            SubjectNumber.setTextSize(16);

            //Creating the divider line
            ImageView divider = new ImageView(this);
            LinearLayout.LayoutParams dividerParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2);
            divider.setLayoutParams(dividerParams);
            divider.setBackgroundResource(R.color.Black);

            //Add Views into the Layout
            ll.addView(SubjectNumber);
            ll.addView(SubjectName);
            ll.addView(divider);
        }



    }

    addSubj = (Button) findViewById(R.id.buttonPlusSubject);
    addSubj.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Intent toAddSubj = new Intent(MainActivity.this,
                    AddSubjectActivity.class);
            startActivity(toAddSubj);
            finish();
        }
    });
}






@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;
}

}

Please do take note that no id is assigned for each layout. It would help if there is a code to identify the parent of the parent of the button (The button is in a relative layout, which is in a linear layout where the linear layout must be removed by clicking the button.

How to&Answers:

First find your parent layout using

ll = (LinearLayout) findViewById(R.id.main_linearlayout);

get the child layout using

final LinearLayout child = (LinearLayout) ll.findViewById(count);

now to remove the whole layout you can use removeview() method as below

ll.removeView(child);

to only remove all views from the particular layout(here for eg. child) you can use

child.removeAllViews();

Answer:

You can call view.setVisiblility(View.GONE) if you want to remove it from the layout, or view.setVisibility(View.INVISIBLE) if you just want to hide it.

Answer:

You can remove a Child View from a parent by calling removeView(View view), for example like this :

parent.removeView(child);

Answer:

Supposing that your LinearLayout ID is my_linear_layout, just do this in your onClickListener:

 findViewById(R.id.my_linear_layout).setVisibility(View.GONE);

In your XML, be sure to put the ID:

 <LinearLayout 
      android:id="@+id/my_linear_layout"
      ...>
 </LinearLayout>