Develop Reference

How to update linearlayout child view programmatically in android?

I have created linearylayout programatically. where it has multiple rows created having white background. Now if I click on any row then only that row's imageview icon should be changed(should be green) and other row's imageview background should be changed to white. Is there any substitude of notifyDataSetChanged for linearlayout in android. below is my code.
for (int i = 0; i <= obj_tribe_info.al_ethnicity_secondary.size(); i++) {
final int position = i;
al_eth_bool.add(false);
final LinearLayout ll_values = new LinearLayout(_activity);
ll_values.setOrientation(LinearLayout.HORIZONTAL);
ll_values.setGravity(Gravity.CENTER_VERTICAL);
LayoutParams LLParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
ll_values.setLayoutParams(LLParams);
ll_values.setBackgroundResource(R.drawable.my_tribe_box_top);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(50, 0, 0, 0);
final ImageView iv_icon = new ImageView(_activity);
if (al_eth_bool.get(position)) {
iv_icon.setBackgroundResource(R.drawable.notify_onn);
} else {
iv_icon.setBackgroundResource(R.drawable.notify_off);
}
iv_icon.setLayoutParams(layoutParams);
ll_values.addView(iv_icon);
TextView tv_value = new TextView(_activity);
tv_value.setTextColor(_activity.getResources().getColor(
R.color.black));
tv_value.setLayoutParams(layoutParams);
if (i == 0) {
tv_value.setText(obj_tribe_info.str_ethnicity_primary);
} else {
tv_value.setText(obj_tribe_info.al_ethnicity_secondary
.get(i - 1).str_ethnicity_secondary);
}
ll_values.addView(tv_value);
ll_ethnicity.post(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
ll_ethnicity.addView(ll_values);
}
});
ll_values.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (al_eth_bool.get(position)) {
iv_icon.setBackgroundResource(R.drawable.notify_off);
al_eth_bool.set(position, false);
} else {
iv_icon.setBackgroundResource(R.drawable.notify_onn);
al_eth_bool.set(position, true);
}
}
});
}

No, there is no substitute for notifyDataSetChanged(), you have to manually inform your ImageViews of that change.
You could iterate like this, as soon as you have a change:
for(int i= 0; i < ll_ethnicity.getChildCount(); i++){
ImageView iv = (ImageView) ((ViewGroup)ll_ethnicity.getChildAt(i)).getChildAt(0);
// new background because something has changed
// check if it's not the imageView you just clicked because you don't want to change its background
iv.setBackground(...);
}
For better performance you may also create an HashMap with your ImageViews and later access it to change some of them as you see fit.

I believe what you're looking for is View.invalidate() method. It tells the application that this view is no longer correct, and it will be redrawn when possible. Call this at the end of the onClick method.

Show hidden views of List item on click of button outside the list

I am developing an Android Application. In this app I am making a list of views using code given below. In each item of list there is delete button with visibility "Gone". Now there is another button Edit outside the list, on click of edit button I have to show delete button on each item of list. but using this code delete button shows only in the last item. Please help me to solve the problem. Thanks.
dynamicView();
edit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
// lay.removeAllViews();
addnew.setVisibility(View.INVISIBLE);
btn_red.setVisibility(View.VISIBLE);
edit.setText("Done");
}
});
public void dynamicView() {
LayoutInflater linflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
for (int i = 0; i < templates.length; i++) {
final View customView = linflater.inflate(R.layout.order_template_item,
null);
btn_red=(ImageView)customView.findViewById(R.id.btn_negative);
btn_drag=(ImageView)customView.findViewById(R.id.button_drag);
btn_delete=(ImageView)customView.findViewById(R.id.button_delete);
final ImageView image = (ImageView)customView.findViewById(R.id.arrow);
final TextView text = (TextView)customView.findViewById(R.id.date);
final TextView sku = (TextView)customView.findViewById(R.id.time);
final TextView price = (TextView)customView.findViewById(R.id.last);
final TextView names =(TextView)customView.findViewById(R.id.name);
image.setId(i);
text.setId(i);
sku.setId(i);
price.setId(i);
names.setId(i);
btn_red.setId(i);
btn_red.setTag(i);
btn_delete.setId(i);
btn_drag.setId(i);
names.setText(templates[i]);
btn_red.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
btn_delete.setVisibility(View.VISIBLE);
TranslateAnimation anim = new TranslateAnimation(100,0 , 0, 0);
anim.setInterpolator(new BounceInterpolator());
anim.setDuration(1000);
btn_delete.setAnimation(anim);
}
});
btn_delete.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
lay.removeView(customView);
}
});
lay.addView(customView);
}

You're holding reference only to the last one btn_red.
You can do something like this.
List<Button> buttons = new LinkedList<Button> ();
Then in your loop after findViewById on btn_red
buttons.add(btn_red);
And finally in your onClickListener
for (Button button: buttons) {
button.setVisibility(View.VISIBLE);
}

Do somethink like below to make visible all the button added to list items-
edit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
addnew.setVisibility(View.INVISIBLE);
for (int i = 0; i < templates.length; i++) {
int id = btn_red.getId(i);
id.setVisibility(View.VISIBLE);
}
edit.setText("Done");
}
});

setText on TextViews created using a for loop - android

I have created a set of TextViews programmatically using a for loop. This what i have tried.
for(int i=1; i<5; i++){
valueTV = new TextView(AddMyVehicle.this);
linearLayout.addView(valueTV);
vehicleModelReturned = myVehicleData.getString("VehicleModel"+x, "");
valueTV.setText(vehicleModelReturned);
valueTV.setGravity(Gravity.CENTER_HORIZONTAL);
valueTV.setTextSize(TypedValue.COMPLEX_UNIT_SP,22);
valueTV.setTextColor(Color.parseColor("#333333"));
i++;
}
this.valueTV.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
valueTV.setText("Hello");
}
});
I need to change the text of clicked TextView to "Hello". How can i achieve this?

You have to add a listener to all your TextView created.
And be careful, you incremented i twice : one in the first line of the for and another one in the end of the for.
for (int i = 1; i < 5; i++)
{
final TextView valueTV = new TextView(AddMyVehicle.this);
linearLayout.addView(valueTV);
vehicleModelReturned = myVehicleData.getString("VehicleModel" + x, "");
valueTV.setText(vehicleModelReturned);
valueTV.setGravity(Gravity.CENTER_HORIZONTAL);
valueTV.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
valueTV.setTextColor(Color.parseColor("#333333"));
valueTV.setId("test");
valueTV.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
TextView tv = (TextView) v;
tv.setText("Hello");
}
});
}

First, set the OnClickListener to all the TextViews you create, not just the last one. That is, move the setOnClickListener() inside the for loop.
Second, in onClick(), change the text of the clicked view and not again the last one you created. The View v param is the view that was clicked. You can cast it to TextView.

How to add onclicklistener to dynamically generated text views

I have dynamically created Textviews in my application. I want to give On click event to this textviews.. When I click on the textview, I need to get the id of the textview..

You try following code.
TextView text = new TextView(this);
text.setText("text here");
ll.addView(text);
text.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "ID : "+arg0.getId(), Toast.LENGTH_SHORT).show();
}
});
in that "ll" is Layout which add textview and after adding put clickListener() for click event.
hope this is useful for you.

Have a look at setOnClickListener and getId.

TextView textView = new TextView(this);
// Set up your text view
textView.setId(1); // Any number is ok
textView.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
int id = v.getId(); // This is the id you want
// Do whatever you want here
}
});

If you are creating TextViews dynamically than just implement OnClickListener:
import android.view.View;
import android.view.View.OnClickListener;
public class MyClickListener implements OnClickListener {
#Override
public void onClick(View v) {
int vId = v.getId();
}
}
and set it to dynamically created view like this:
private TextView createTextView(int vId) {
TextView textView = new TextView(this);
textView.setId(vId);
textView.setOnClickListener(myClickListener);
return textView;
}
P.S.: Don't forget to create & initilialize myClickListener in your Activity.

Creating clickable linearlayout dynamically

I have to create LinearLayouts dinamically according to an Entity List. The Layouts are drawn without problems. My problem is when I try to know which Layout I have clicked, because always is referencing the last.
The code is something like this:
LinearLayout llProducts = FindViewById<LinearLayout>(Resource.Id.llProducts);
LinearLayout llNewProduct;
int i = 0;
foreach(Product p in productsList)
{
llNewProduct = new LinearLayout(this);
llNewProduct.Clickable = true;
llNewProduct.Id = i++;
TextView txtProduct = new TextView(this);
txtProduct.Text = p.Name;
llNewProduct.AddView(txtProduct);
llProducts.AddView(llNewProduct);
llNewProduct.Click += (sender, e)
{
//This always shows the last Id
Toast.MakeText(this, llNewProduct.Id.ToString(), ToastLength.Short).Show();
}
}
I appreciate some help. Thanks

You have to create Array of boolean sucg as boolean[] flag = new boolean[productList.length]. After this, you can set flag[i] = true when you set llNewProduct.Clickable = true; other set flag[i] =false;
After completion for each loop you can find out clicked lineanlayout with the help of this flag such as
for(int i=0;i<flag.length;i++){
if(flag[i]){
Log.v("TAG","Clicked linear layout");
}else{
Log.v("TAG","Not Clicked linear layout");
}
}
Use following code in foor loop
llNewProduct.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(YouActivity.this, ""+v.getId(), Toast.LENGTH_SHORT).show();
}
});

you are using same reference for all added view, create different views in side loop
Try like this:
for(int i1 = 0; i1 < 3;i1++)
{
LinearLayout llNewProduct = new LinearLayout(this);
LayoutParams p = new LayoutParams(100, 100);
llNewProduct.setLayoutParams(p);
if(i1 == 0) llNewProduct.setBackgroundColor(Color.RED);
if(i1 == 1) llNewProduct.setBackgroundColor(Color.GREEN);
if(i1 == 2) llNewProduct.setBackgroundColor(Color.BLUE);
llNewProduct.setClickable(true);
llNewProduct.setId(i1);
llNewProduct.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(CaptureImage.this, ""+v.getId(), Toast.LENGTH_SHORT).show();
}
});
ll1.addView(llNewProduct);
}

As I said on the last comment. The question is solved. Next code shows the id from layout clicked.
llNewProduct.Click += (sender, e)
{
LinearLayout ll = sender as LinearLayout;
Toast.MakeText(this, ll.Id.ToString(), ToastLength.Short).Show();
}