Develop Reference

Set tag for newly(Runtime) created element

I'm creating radio buttons like this in a fragment programmatically in a for loop (i++)
for (int i = 1; i < priceList.length(); i++) {
JSONObject priceObj = (JSONObject) priceList.get(i);
String catName = priceObj.getString("categoryName");
String uid = i*(i+100)+20;
RadioButton rdbtn = new RadioButton(getActivity().getApplicationContext());
rdbtn.setId((row * 2) + i);
rdbtn.setText(catName);
rdbtn.setTextColor(R.color.colorPrimary);
ll.addView(rdbtn);
}
linearLayout.removeAllViews();
linearLayout.addView(ll);
i want to add that uid as tag, but if i add .setTag(uid) it is giving error like below
FATAL EXCEPTION: main
Process: com.vistaraitsolutions.hoteladmin, PID: 13629
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.RadioButton.setTag(java.lang.Object)' on a null object reference
at com.vistaraitsolutions.hoteladmin.FragmentStepThreeBooking.addRadioButtons(FragmentStepThreeBooking.java:226)
at com.vistaraitsolutions.hoteladmin.FragmentStepThreeBooking$1.onResponse(FragmentStepThreeBooking.java:161)
at com.vistaraitsolutions.hoteladmin.FragmentStepThreeBooking$1.onResponse(FragmentStepThreeBooking.java:157)
at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:72)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6856)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
and that tadio buttons not yet added to linear layout yet, aftre loop ony im adding radio group to layout! now i need to set tags.
this is code with setTag()
for (int i = 1; i < priceList.length(); i++) {
JSONObject priceObj = (JSONObject) priceList.get(i);
String catName = priceObj.getString("categoryName");
String uid = i*(i+100)+20;
RadioButton rdbtn = new RadioButton(getActivity().getApplicationContext());
rdbtn.setId((row * 2) + i);
rdbtn.setText(catName);
//rdbtn.setTag(url); here im adding setTag
rdbtn.setTextColor(R.color.colorPrimary);
ll.addView(rdbtn);
}
linearLayout.removeAllViews();
linearLayout.addView(ll);
please help me

java.lang.NumberFormatException: Invalid int: android.support.v7.widget.AppCompatEditText

I wrote this code in order to simplify part numbers in math e.g. 2a/2b = a/b. android studio shows no problems but when i run this code: (maz stands for lowest number, liels stands for highest number, skait is the 2a in the previous example and sauc is the 2b int the previous example, skaitout and saucout are the output text fields corresponding to the part number parts, skaitout is the top number and saucout is the bottom number)
package com.example.mikus.simplify;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View skait = findViewById(R.id.skait);
View sauc = findViewById(R.id.sauc);
TextView skaitout = (TextView) findViewById(R.id.skaitout);
TextView saucout = (TextView) findViewById(R.id.saucout);
int maz;
int liels;
int x;
int i = 0;
maz = Integer.parseInt(skait.toString());
liels = Integer.parseInt(sauc.toString());
if(maz > liels){
x = maz;
maz = liels;
liels = x;
i = 1;
}
if(maz == liels){
skaitout.setText('1');
saucout.setText('1');
}else{
x = maz;
while(true){
if(maz % x == 0 && liels % x == 0){
maz /= x;
liels /= x;
x = maz;
}else{
if(x == liels){
return;
}else{
x++;
}
}
}
}
if (i == 0) {
skaitout.setText(maz);
saucout.setText(liels);
}
if(i == 1){
skaitout.setText(liels);
saucout.setText(maz);
}
}
}
i get the error:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mikus.simplify, PID: 24905
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mikus.simplify/com.example.mikus.simplify.MainActivity}: java.lang.NumberFormatException: Invalid int: "android.support.v7.widget.AppCompatEditText{11f3506 VFED..CL. ......ID 0,0-0,0 #7f0b0057 app:id/skait}"
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3256)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3352)
at android.app.ActivityThread.access$1100(ActivityThread.java:223)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7231)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NumberFormatException: Invalid int: "android.support.v7.widget.AppCompatEditText{11f3506 VFED..CL. ......ID 0,0-0,0 #7f0b0057 app:id/skait}"
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parse(Integer.java:410)
at java.lang.Integer.parseInt(Integer.java:367)
at java.lang.Integer.parseInt(Integer.java:334)
at com.example.mikus.simplify.MainActivity.onCreate(MainActivity.java:23)
at android.app.Activity.performCreate(Activity.java:6877)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3209)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3352) 
at android.app.ActivityThread.access$1100(ActivityThread.java:223) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:158) 
at android.app.ActivityThread.main(ActivityThread.java:7231) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
in phone the program just crashes. can anyone help me.

You try to convert a view to string and parse this to integer:
liels = Integer.parseInt(sauc.toString());
maz = Integer.parseInt(skait.toString());
I guess you want to do something like this:
liels = Integer.parseInt(sauc.getText().toString());
maz = Integer.parseInt(skait.getText().toString());
Also, it´s possible that the user make some wrong input. You could catch the exception if the input is not a number like:
try{
liels = Integer.parseInt(sauc.getText().toString());
maz = Integer.parseInt(skait.getText().toString());
}catch(NumberFormatException ex){
//inform the user about wrong input
}
or you can restrict user input to only numbers by setting this attribute to editTexts:
android:inputType="number"
And be aware: Later you will get also exceptions by setting the text:
if (i == 0) {
skaitout.setText(maz);
saucout.setText(liels);
}
if(i == 1){
skaitout.setText(liels);
saucout.setText(maz);
}
This will throw an exception, you have to cast the integer to a string like:
if (i == 0) {
skaitout.setText(Integer.toString(maz));
saucout.setText(Integer.toString(liels));
}
if(i == 1){
skaitout.setText(Integer.toString(liels));
saucout.setText(Integer.toString(maz));
}
or just for example with some quitation marks:
saucout.setText(""+maz);

You're trying to parse View as int.

How to get all edittext data from listview

My listview have 19 rows and i need to get all edittext data from listview and store into arraylist.
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int itemCount = mListView.getCount();
Log.d("count", ""+itemCount);
final ArrayList<String> collection = new ArrayList<>();
for(int i=0; i<itemCount; i++){
view1 = mListView.getChildAt(i);
Log.d("Position: ", ""+view1);
EditText tt = (EditText)view1.findViewById(R.id.etqty);
value = tt.getText().toString();
collection.add(value);
}
//int position = contractstoreAdapter.getItem();
Log.d("number", String.valueOf(collection));
}
});
Here is my error.
09-07 08:09:05.526 8669-8669/com.example.chintatt.cbi E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.chintatt.cbi, PID: 8669
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
at com.example.chintatt.cbi.Fragment_orderstock$1.onClick(Fragment_orderstock.java:107)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

ListView doesn't always contain the data, cause a child view is created every time it comes into display
You must have used some adapter to store the data right? Try to get all the info from there. Not from the ListView but from the adapter in which the data contains.
Hope this will help You
If u can tell how u are storing the data in Adapter it would help me further to tell your answer precisely

for (int i = 0; i <= mListView.getLastVisiblePosition() - mListView.getFirstVisiblePosition(); i++)
I believe this should be the loop that you need to implement.

EditText tt = (EditText)view1
Use above line
EditText tt = (EditText)view1.findViewById(R.id.etqty);
Why are you calling findViewById(), whether you get edittext in your view itself

My apps keeps crashing when button is pressed and EditText is empty [duplicate]

This question already has answers here:
Proper way to avoid parseInt throwing a NumberFormatException for input string: ""
(7 answers)
Closed 6 years ago.
I've tried lot of things found here, but it keeps crashing. I wanna know what do i need to add in order to show a Toast message when button is clicked and EditText is empty.
INFO: The app is supposed to send the two values in the EditText's to another activity, showing Toast's in the following exceptions:the first value higher than 6; the second value higher than (firstvalue*14); and if the fields are empty (which is my problem)
Here's my code:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
TextView saludo_bienvenida;
EditText et1_creditos;
EditText et2_faltas;
Button boton_ingresar;
Button boton_info;
String numero_creditos;
String numero_faltas_actuales;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
saludo_bienvenida = (TextView) findViewById(R.id.saludo_bienvenida);
et1_creditos = (EditText) findViewById(R.id.edittext1_numero_creditos);
et2_faltas = (EditText) findViewById(R.id.edittext2_numero_faltas);
boton_ingresar = (Button) findViewById(R.id.boton_ingresar);
boton_info = (Button) findViewById(R.id.boton_info);
if (boton_ingresar != null) {
boton_ingresar.setOnClickListener(this);
}
if (boton_info != null) {
boton_info.setOnClickListener(this);
}
et1_creditos.setInputType(InputType.TYPE_CLASS_NUMBER);
et2_faltas.setInputType(InputType.TYPE_CLASS_NUMBER);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.boton_ingresar:
numero_creditos = et1_creditos.getText().toString();
numero_faltas_actuales = et2_faltas.getText().toString();
int numero_creditos1 = Integer.parseInt(numero_creditos);
int numero_faltas_actuales1 = Integer.parseInt(numero_faltas_actuales);
int o = numero_creditos1 * 14;
if (numero_creditos1>6) {
Toast.makeText(getApplicationContext(), "Ingrese un número válido de créditos", Toast.LENGTH_LONG).show();
}else if (numero_faltas_actuales1 > o){
Toast.makeText(getApplicationContext(), "El número de faltas ingresadas es mayor que el número de horas del curso", Toast.LENGTH_LONG).show();
}else{
Intent intent = new Intent(MainActivity.this,Resultados.class);
intent.putExtra("numero_creditos",numero_creditos);
intent.putExtra("numero_faltas_actuales",numero_faltas_actuales);
startActivity(intent);
}
break;
case R.id.boton_info:
Intent informacion = new Intent(MainActivity.this,Informacion.class);
startActivity(informacion);
break;
}
}
}
This is the log:
06-17 01:36:17.419 2738-2738/absence_counter.app.jorgepasco.com.absencecounter E/AndroidRuntime: FATAL EXCEPTION: main
Process: absence_counter.app.jorgepasco.com.absencecounter, PID: 2738
java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:334)
at absence_counter.app.jorgepasco.com.absencecounter.MainActivity.onClick(MainActivity.java:60)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

So thanks you for your log !
You can see on your log that you have a problem when you parseInt. You try to parseInt an empty String.
So when the user do not write anything, you have to set a default value yourself.
You can do something like that before your parse:
if(numero_creditos.equals(""))
numero_creditos = "0";
But if I were you, I would force the user to right directly an integer

Please, show us your log box.
Perhaps the app crash because you don't have any default case in your switch case. So if v.getId() is not what you think, it will crash.
Simply, add that at the end of your switch case:
switch(v.getId()){
case: ...
case: ...
default: Toast.makeText(getApplicationContext(),"v.getId = " + v.getId());
}
But I would be easier for me to solve your problem with your log box !

et1_creditos.getText() can maybe send a null value. Then null.toString() has no sense because null does not have toString().
try:
String creditos = et1_creditos.getText()
if(creditos != null){
//stuff here
}

It is failing on this line.
int numero_creditos1 = Integer.parseInt(numero_creditos);
If your numeor_creditos is empty it won't be integer.
Try
int numero_creditos1;
if(TextUtils.isEmpty(numero_creditos){
numero_creditos1 = 0;
} else {
numero_creditos1 = Integer.parseInt(numero_creditos);
}

OnClickListener inside a for loop

I'm getting a "Error:(99, 95) error: local variable i is accessed from within inner class; needs to be declared final" for trying to use the "i" variable from a For loop in the OnClick method.
I tried to put this "i" inside a global variable but then I get a "ArrayIndexOutOfBoundsException".
But I can't think in another way to do so.
private void createTextViews(TextView[] textViewArray, LinearLayout linearLayout){
for (int i = 0; i < keys.length; i++) {
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(20, 0, 0, 20);
TextView newView = new TextView(getActivity());
newView.setLayoutParams(layoutParams);
newView.setText("Watch the Trailer " + (i + 1));
newView.setTextSize(22);
newView.setTextColor(getResources().getColor(R.color.words));
newView.setBackgroundColor(getResources().getColor(R.color.button));
newView.setHighlightColor(getResources().getColor(R.color.background));
newView.setPadding(5, 5, 5, 5);
newView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(YOUTUBE_URL+keys[i]));
startActivity(intent);
}
});
linearLayout.addView(newView);
textViewArray[i] = newView;
}
}
How can I do this?
--------------
EDIT
Here's the log for the ArrayIndexOutOfBoundsExeption:
11-03 01:08:13.866 32159-32159/app.com.example.android.popularmovies E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: app.com.example.android.popularmovies, PID: 32159
java.lang.ArrayIndexOutOfBoundsException: length=3; index=3
at app.com.example.android.popularmovies.Detail_ActivityFragment$1.onClick(Detail_ActivityFragment.java:99)
at android.view.View.performClick(View.java:4456)
at android.view.View$PerformClick.run(View.java:18465)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)

you must init new final int value
add final int ex = i;
before setOnClickListener
and don't forget to change
Uri.parse(YOUTUBE_URL + keys[i]));
to
Uri.parse(YOUTUBE_URL + keys[ex]));

The reason you are getting the out of bound exception is because in the last loop you are i++ing although it is not entering the loop again but the i that is a class variable is now out of bound. So the whole approach of putting i as a class variable will not work in your case.
A way to achieve this is to actually save i in a tag in the view and then read that tag from the view that is clicked.
newView.setTag(i)
Then in the onClick
v.getTag()
above can be used to get the i