Develop Reference

Adding Layout dynamically for number of times on button click

The scenario is, When the user clicks the button, I need to add
particular layout in known position of parent layout for the number of times button clicked.
I don't know whether it works or not. I tried this following solution which I got from other posts
Buttononclicklistenercode is,
parent = (ViewGroup) C.getParent();//c is a layout in which position i want to add view
final int index = parent.indexOfChild(C);
tobeadded=getLayoutInflater().inflate(R.layout.block_tobeadded_foremi,null);
((Button)findViewById(R.id.button88)).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addviewcount+=1;
LinearLayout addinglayout=new LinearLayout(MyActivity.this);
addinglayout.setOrientation(LinearLayout.VERTICAL);
parent.removeViewAt(index);
addinglayout.removeAllViews();
for(int i=0;i<addviewcount;i++)
addinglayout.addView(tobeadded);
parent.addView(addinglayout, index);
}
});
But I am getting java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. In my code, before adding that layout, I have invoked the method removeViewAt() for parent.
Can anyone help me to know what is wrong in that.And Is there any other way to do this? Thanks in advance!

You are getting an IllegalStateException because you've already attached the child to the root of the layout.
parent.removeViewAt(index);
addinglayout.removeAllViews();
for(int i=0;i<addviewcount;i++)
addinglayout.addView(tobeadded);//Exception in this line
parent.addView(addinglayout, index);
Let's say addviewcount is 2.
Now in the first iteration, tobeadded is attached to addinglayout.
In the second iteration, you're again trying to attach tobeadded to addinglayout which results in an exception, since The specified child already has a parent. To solve this, You must call removeView() on the child's parent first.
All in all no child is supposed to have more than one parent. And the way you're implementing what you're trying to do is wrong. Create an array of View objects and attach them to the layout in a loop. This will solve your problem.
Here's a link where I've answered a similar question in detail few months back.
https://stackoverflow.com/a/46672959/2356570

LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
On Click of button try this:
addinglayout.removeAllViews();
View text = new View(context);
textNotes.setLayoutParams(lparams);
addinglayout.addView(text);

public class SampleDynamiclay extends AppCompatActivity {
Button add, replace;
LinearLayout dynamiclay;
int newid = 100;
int replaceid;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sampledynamiclay);
add = (Button) this.findViewById(R.id.add);
replace = (Button) this.findViewById(R.id.replace);
dynamiclay = (LinearLayout) this.findViewById(R.id.dynamiclay);
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView txt = new TextView(SampleDynamiclay.this);
txt.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
newid = newid + 1;
txt.setTag(newid + "");
txt.setTextColor(getResources().getColor(R.color.black));
txt.setText("TextView " + newid);
dynamiclay.addView(txt);
}
});
replace.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
newid = newid + 1;
View removableView = dynamiclay.getChildAt(2);
dynamiclay.removeView(removableView);
TextView txt = new TextView(SampleDynamiclay.this);
txt.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
txt.setTag(newid + "");
txt.setTextColor(getResources().getColor(R.color.black));
txt.setText("TextView is replaced " + newid);
dynamiclay.addView(txt, 2);
}
});
}
}

A button to create an object on android Studio

How can we create a button with a command to create an other object on Android ?
i mean, i press the button on the app and it create in the layout, a new object, for exemple a textView.
how could i proceed ?
thanks !

This is a way:
First you defined into your xml file a layout parent for your TextView and get it in your code:
final LinearLayout parentView = (LinearLayout) findViewById(R.id.parent_view_id);
Then you define create your TextView for example:
final TextView textView = new TextView(context);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT
); // set height and width
textView.setMargins(left, top, right, bottom); // set margin if necessary
textView.setLayoutParams(layoutParams);
and in your listener :
myButton.setOnClickListener(new View.OnClickListener() {
#Override public void onClick(View view) {
parentView.addView(textView);
}
});
Hope this helps.
Sorry for my english.

first of all create a click listener on your button
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
}
and then this with add a new textview into your target layout
TextView tv = new TextView(this);
tv.setText("hello word!");
tv.setTextSize(18);
tv.setTextColor(Color.BLACK);
tv.setClickable(true);
tv.setPadding(0, 10, 0, 0);
tv.setGravity(Gravity.CENTER);
mainLayout.addView(tv);
in this ex mainLayout is the view that you want to add new object like textview, ....

Move programatically added TextView back and forth between layouts onClick

I have this FlowLayout where I have a set of TextView's which I build programatically. After getting the wanted names, I create a TextView for each name inside the layout.
What I want to do, if I click on the TextView, I want to move it into another layout. I manage to do that but I also want to move it back. I could also do that until I program it to, but I can't program it to be like a infinite loop.
This is a piece of code which will make you understand better what I'm talking about hopefully.
TextView tv = new TextView(new ContextThemeWrapper(getActivity(), R.style.FlowLayoutTextView));
tv.setText("Test");
tv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView tvSelected = new TextView(new ContextThemeWrapper(getActivity(), R.style.FlowLayoutTextView));
tvSelected.setText(tv.getText().toString());
tvSelected.setLayoutParams(params);
tv.setVisibility(View.GONE);
filteredLayout.addView(tvSelected);
}
});
unfilteredLayout.addView(tv);
Is it possible to make it work? Thanks.
LE: As you can see in the onClickListener event of the TextView, I create the other TextView I add in the other layout, to move it back I could also add an onClickListener event to this TextView but this is not the solution.

Try following:
boolean isInFilterLayout = false; //Class variable
TextView tv = new TextView(new ContextThemeWrapper(getActivity(), R.style.FlowLayoutTextView));
tv.setText("Test");
tv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(isInFilterLayout){
filteredLayout.remove(tv);
unfilteredLayout.addView(tv);
isInFilterLayout = false;
}else{
unfilteredLayout.remove(tv);
filteredLayout.addView(tv);
isInFilterLayout = true;
}
}
});
unfilteredLayout.addView(tv);

Android realtime add button

I need a button that, when clicked, would add a TextView below it. Also, the TextView cannot be made invisible and appear on click in this case, it must add the TextView. Was looking for this and couldn't find anything that suits my needs.

Set a listener on the button and for each click, create a new TextView and add it to the layout.
final LinearLayout theLayout = (LinearLayout)findViewById(R.id.thelayout);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView tv = new TextView(MainActivity.this);
tv.setText("Hello");
tv.setTextColor(Color.BLACK);
theLayout.addView(tv);
}
});
Update: Added text color above

How to remove a Button added programatically

I am adding buttons to a linear layout at runtime and need to add the functionality of removing them if the user desires. At the moment I have a button which opens a popup with a list consisting of the text for each button added. If possible, would I be able to have each onItemClick delete the corresponding button? If not, what would be the best way to remove a specific button?
Here is the code for adding buttons:
private void addButton(){
LinearLayout lL = (LinearLayout) findViewById(R.id.requirement_linear);
lL.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
p.setMargins(0,2,0,0);
Button b = new Button(this);
b.setBackgroundResource(R.drawable.blue_button);
b.setOnClickListener(openRequirement);
b.setTextColor(Color.parseColor("#FFFFFF"));
String button_text = (index + 2) + ". " + requirement_list.get(index + 1).getName();
b.setText(button_text);
requirements_text.add(button_text);// requirements_text is an arraylist<string> which stores the text so I can display them in my popup to delete them.
index ++;
lL.addView(b,p);
}

You can use removeView() on your LinearLayout and pass your button. You can identify the button on the OnClick(View view) callback, the view there is the button.
as requested, here is an example.
final LinearLayout lL = (LinearLayout) findViewById(R.id.requirement_linear);
Button b = new Button(this);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View button) {
lL.removeView(button);
}
});
lL.addView(b);
Alternatively you can use removeViewAt() to remove a child view by index. You can use the index of your 'list of text of buttons'. Assuming its a listview, you can try this.
lview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
lL.removeViewAt(position);
}
});

here is how i hide and show the buttons
Button b = new Button(this);
b.setVisibility(View.GONE); // this will hide the button and it will now show
b.setVisibility(View.VISIBLE); // this will show the button if it was hidden before
Enjoy!