Develop Reference

Can move child in LinearLayout up but not down

Can someone please explain why the first piece of code here works but not the last piece? The only difference is the index of which i insert my view, i-1 and i+1. Is i+1 just not possible with index? I can write any other number in there and it works.
upButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i = 0; i < drawerViewGroup3.getChildCount(); i++) {
View view = drawerViewGroup3.getChildAt(i);
TextView tv = (TextView) view.findViewById(R.id.drawer_name);
if (tv.getText().toString().equals(drawerName.getText().toString()) && i != 0) {
drawerViewGroup3.removeView(view);
drawerViewGroup3.addView(view, i - 1);
}
}
}
});
downButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i = 0; i < drawerViewGroup3.getChildCount(); i++) {
View view = drawerViewGroup3.getChildAt(i);
TextView tv = (TextView) view.findViewById(R.id.drawer_name);
if (tv.getText().toString().equals(drawerName.getText().toString())) {
drawerViewGroup3.removeView(view);
drawerViewGroup3.addView(view, i + 1);
}
}
}
});
Some context on the app. I have a vertical oriented LinearLayout with multiple LinearLayouts inside. When clicking the two Buttons in the code, one of the children is to move up or down, switching their positions.
EDIT: Ok so I figured it out.
downButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View viewToMove = null;
int viewToMovePos = drawerViewGroup3.getChildCount();
for (int i = 0; i < drawerViewGroup3.getChildCount(); i++) {
View view = drawerViewGroup3.getChildAt(i);
TextView tv = (TextView) view.findViewById(R.id.drawer_name);
if (tv.getText().toString().equals(drawerName.getText().toString()) && i != drawerViewGroup3.getChildCount() - 1) {
viewToMovePos = i;
viewToMove = view;
}
}
alert.dismiss();
if (viewToMovePos != drawerViewGroup3.getChildCount()) {
drawerViewGroup3.removeView(viewToMove);
drawerViewGroup3.addView(viewToMove, viewToMovePos + 1);
}
}
});
Not the prettiest code and probably not gonna help others as it's very specific, but that was the answer.

When you remove a view from your LinearLayout, the view at index i is now the view which was after the one which you removed. Then you add a view at i - 1 which is before this view (the one which was previously after the removed view). The final result is that you remove a view and insert back where it used to be.
Instead, you need to add the view at i - 2.
I suggest that you look at RecyclerView. It is specifically designed to efficiently create a dynamic list of views for given data. You only have to manipulate the data and RecyclerView does all the hard work for you.

android studio how to set some TextViews id's with for

i want to set lots of Edit Texts id's and i don't know how to get those id's.
EditText[] texts;
for(int i=0;i++;i<15){
tests[i]=(EditText)findViewById(R.id. )
}
my Edit Text id's:
et1,et2,et3,...

first create a empty list of EditTexts
then use this code and send them rootView of Your Layout to find all EditTexts :
private List<EditText> editTexts; //global Scop
private void findAllEditTexts(ViewGroup group) {
for (int i = 0, count = group.getChildCount(); i < count; ++i) {
View view = group.getChildAt(i);
if (view instanceof EditText) {
if (editTexts == null)
editTexts = new ArrayList<EditText>();
editTexts.add((EditText) view);
} else if (view instanceof ViewGroup && (((ViewGroup) view).getChildCount() > 0)) {
findAllEditTexts((ViewGroup) view);
}
}
}
now in editTexts List you have all EditTexts :)

Android : Using context to get all TextView

Is it possible to get all the TextView in an activity and change their values without knowing any ID? May be something like UI automtor tool that return UI hierarchy but at Java programming level. I tried to Google this but couldn't find any solution.
Edit
What I am trying to achieve here is, I have an external library/SDK which modifies all textView values. So I am planning to initialise it on top of each activity and let the SDK do the work of modifying all the TextViews value.

You can use this code to find all TextViews in your layout, just pass the parent view and it will do the rest:
public static void findViews(View v) {
try {
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
for (int i = 0; i < vg.getChildCount(); i++) {
View child = vg.getChildAt(i);
// recursively call this method
findViews(child);
}
} else if (v instanceof TextView) {
//do whatever you want ...
}
} catch (Exception e) {
e.printStackTrace();
}
}

try this
First initialize the parent control and use this
ArrayList<TextView> list = new ArrayList<TextView>();
for( int i = 0; i < layout.getChildCount(); i++ ){
if( layout.getChildAt( i ) instanceof TextView )
{
// change the values of text view here
((TextView)layout.getChildAt( i )).setText("your text here");
}
}

If you have activity layout then try as follows
ArrayList<EditText> myEditTextList = new ArrayList<EditText>();
for( int i = 0; i < activityLayout.getChildCount(); i++ ){
if( activityLayout.getChildAt( i ) instanceof EditText )
myEditTextList.add( (EditText) activityLayout.getChildAt( i ) );
}
and getting their values
for(int i=0;i < myEditTextList.size();i++){
System.out.println(myEditTextList.get(i).getText().toString());
}
Hope this will helps you.

selected check boxes count and passing it to another activity

i have 4 check boxes in 1st activity and i wanna store only those user selected check boxes and have to show in another activity my question is how can i count the user selected checkboxes. please help with me logic
int x = 0;
public void onCheckboxClicked(View view) {
checked = ((CheckBox) view).isChecked();
if (((CheckBox) view).isChecked() == true) {
int i = 0;
while (i != 4) {
x = i + 1;
i++;
}
}
}
On Submit Button
if(x!=0) {
show alert();
and passing check boxes selected count
}

You can run a loop and find the number of CheckBox views and then accordingly get the count of checked CheckBoxes
Ex:
main = (LinearLayout) findViewById(R.id.main);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
count = 0;
int childcount = main.getChildCount();
for (int i=0; i < childcount; i++){
View view = main.getChildAt(i);
if (view instanceof CheckBox) {
if(((CheckBox) view).isChecked())
count++;
}
}
text.setText("count: " + count);
}
});

First put checkboxes in an array:
ArrayList<CheckBox> checkList = new ArrayList<CheckBox>();
you can do it with:
for(int i=0 ; i<4; i++)
{
checkList.add(YOURCHECKBOX) ;
}
than you can check which CB are checked (implement where you want it to save only those which are checked..) with:
for(int i=0 ; i<checkList.size(); i++)
{
if(checkList.get(i).isChecked() == true)
{
YOURCODE
}
}

Android Clearing all EditText Fields with Clear Button

How do I clear all the EditText fields in a layout with a Clear Button. I have a registration Activity that has about 10 different EditTexts. I know I could go and grab a reference to each specifically and then set.Text(""); But I am looking for a more dynamic elegant way. Possibly grab the Layout and loop through all the items in there looking for EditText types and then setting those to "". Not sure how to do that though and tried searching on the web for it but no luck. Any sample code?

The answer by #Pixie is great but I would like to make it much better.
This method works fine only if all the EditText are in a single(one) layout but when there are bunch of nested layouts this code doesn't deal with them.
After scratching my head a while I've made following solution:
private void clearForm(ViewGroup group) {
for (int i = 0, count = group.getChildCount(); i < count; ++i) {
View view = group.getChildAt(i);
if (view instanceof EditText) {
((EditText)view).setText("");
}
if(view instanceof ViewGroup && (((ViewGroup)view).getChildCount() > 0))
clearForm((ViewGroup)view);
}
}
To use this method just call this in following fashion:
clearForm((ViewGroup) findViewById(R.id.sign_up));
Where you can replace your R.id.sign_up with the id of root layout of your XML file.
I hope this would help many people as like me.
:)

You can iterate through all children in a view group and clear all the EditText fields:
ViewGroup group = (ViewGroup)findViewById(R.id.your_group);
for (int i = 0, count = group.getChildCount(); i < count; ++i) {
View view = group.getChildAt(i);
if (view instanceof EditText) {
((EditText)view).setText("");
}
}

Use editText.getText().clear();

after onclick of any action do below step
((EditText) findViewById(R.id.yoursXmlId)).setText("");
or Clear all EditText fields by iterating all childrens:
ViewGroup group = (ViewGroup)findViewById(R.id.your_group);
for (int i = 0, count = group.getChildCount(); i < count; ++i) {
View view = group.getChildAt(i);
if (view instanceof EditText) {
((EditText)view).setText("");
}
}
or use simple below step :
editText.getText().clear();
Might be helpful.

It's very simple.Type this in your function of button-
finish();
startActivity(this,YourCurrentActivity.class);
As Simple as that.
Welcome.

In my case I've done this.
public static void resetForm(ViewGroup group) {
for (int i = 0, count = group.getChildCount(); i < count; ++i) {
View view = group.getChildAt(i);
if (view instanceof EditText) {
((EditText) view).getText().clear();
}
if (view instanceof RadioGroup) {
((RadioButton)((RadioGroup) view).getChildAt(0)).setChecked(true);
}
if (view instanceof Spinner) {
((Spinner) view).setSelection(0);
}
if (view instanceof ViewGroup && (((ViewGroup) view).getChildCount() > 0))
resetForm((ViewGroup) view);
}
}

I used this for nested LinearLayout to clear EditTexts and RadioButtons
//method clear
private void clear(ViewGroup group)
{
for(int i=0,count=group.getChildCount();i
if(view instanceof LinearLayout)
{
clear((ViewGroup) view);
}
else if(view instanceof EditText)
{
((EditText) view).getText().clear();
}
if (view instanceof RadioButton)
{
((RadioButton) view).setChecked(false);
}
}//end for
}//end method clear

You can always do this...it works for me:
mClearButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mEditName.getText().clear();
mEditSummary.getText().clear();
mEditPrice.getText().clear();
mEditQuantitiy.getText().clear();
}
});
this way you have one fat button that clears all the fields for you once

I created a reset button and write a reset onclick method as follow:
public void reset(View View){
Intent intent = new Intent(MainActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
It works for me and also it works without addflags part. But I would like to know whether it is a good approach or not.

// Update answer
private void clearEditTextGroup(ViewGroup group){
for(int i=0 ; i< group.getChildCount(); i++){
View view = group.getChildAt(i);
if(view instanceof EditText){
// use one of clear code
}
if(view instanceof ViewGroup && (((ViewGroup)view).getChildCount() > 0))
clearEditTextGroup((ViewGroup)view);
}
}
use one of this code to clear your edittext
edittext.getText().clear();
or
edittext.setText(null);
or
edittext.setText("");

use
editText.getText().clear();
or setText as Empty using this below code
editText.setText(");