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How to delete individual elements from textview on Android studio

I am doing this project, can anyone help me to delete individual elements from the text view?enter image description here
here's i implemented the 'button' to insert and 'button2' to delete, and here's the code down bellow
public class MainActivity extends Activity {
private EditText editText;
private Button button;
private TextView textView;
private static final String TAG = "MainActivity";
// To hold all data in different mode : Portrait and landscape
private final String text_context = "TX";
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG, "onCreate: in");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText)findViewById(R.id.editText);
button = (Button)findViewById(R.id.button);
textView = (TextView)findViewById((R.id.textView));
textView.setText(""); // make it no text at runtime, but text at view
textView.setMovementMethod(new ScrollingMovementMethod()); // make it scrolling
editText.setText("");
final View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
String result = editText.getText().toString();
result += "\n";
textView.append(result);
editText.setText(""); // text on EDITTEXT will disappear as soon as we click the button
}
};
final View.OnClickListener onClickListener1 = new View.OnClickListener() {
#Override
public void onClick(View view) {
}
};
if(editText != null)
button.setOnClickListener(onClickListener);
Log.d(TAG, "onCreate:out");
}
}
Please help me TO IMPLEMENT DELETE ACTION VIA BUTTON2....

Right now your onclick listeners are generically listening for clicks on any view.
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Handle button events
}
});
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Handle button2 events
}
});
Or better yet implement View.OnClickListener() on your activity

Use regex
String input = editText.getText().toString();
String regex = "\\b" + input + "\\b";
String tvText = textView.getText().toString();
tvText = tvText.replaceAll(regex, "");
textView.setText(tvText);
Put this code in
final View.OnClickListener onClickListener1 = new View.OnClickListener() {
#Override
public void onClick(View view) {
//code goes here
}
};
if(editText != null)
// add this onclick to your button2
button2.setOnClickListener(onClickListener1);
Log.d(TAG, "onCreate:out");
}

Adding onClick Listener on dynamically created elements not working

I am creating dynamic textview on runtime. on adding onClick() Listener. it works only on the last textview created on runtime and not on every textview created.
This is my code:-
#Override
public void onComplete(#NonNull Task<Object> task) {
if (task.isComplete()) {
ArrayList<Document> tagLocat = (ArrayList<Document>) task.getResult();
tv=new TextView[tagLocat.size()];
for (i = 0; i < tagLocat.size(); i++) {
Document doc = tagLocat.get(i);
TextView tv1 = new TextView(MainActivity.this);
Log.i("Document", "" + doc);
notification = doc.getString("notification");
Log.i("Double", "" + notification);
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lparams.setMargins(10,10,10,10);
tv1.setLayoutParams(lparams);
tv1.setTag(i);
tv1.setId(i);
tv1.setTextSize(30);
tv1.setPadding(50, 0 ,0,0);
tv1.setText(notification);
tv[i] = tv1;
linearLayout.addView(tv[i]);
tv[i].setBackgroundColor(Color.GRAY);
tv[i].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
tv[i].setBackgroundColor(Color.LTGRAY);
}
});
}
} else {
Log.i("Exception",task.getException().toString());
}
}

You have to add your textview in array after set onclicklistener
like
tv1.setLayoutParams(lparams);
tv1.setTag(i);
tv1.setId(i);
tv1.setTextSize(30);
tv1.setPadding(50, 0 ,0,0);
tv1.setText(notification);
tv1.setBackgroundColor(Color.GRAY);
tv1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
v.setBackgroundColor(Color.LTGRAY);
}
});
tv[i] = tv1;
linearLayout.addView(tv[i]);

Set onClickListener before adding view .
Solution:-
for (int i = 0; i < tagLocat.size(); i++) {
// Do stuff here
tv[i].setBackgroundColor(Color.GRAY);
tv[i].setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
v.setBackgroundColor(Color.LTGRAY);
}
});
tv[i] = tv1;
linearLayout.addView(tv[i]);
}
Make sure this will not toggle the color onClick().If you want such behaviour you need to maintain the state of TextView.

i want to create a counter with a text view

i want to create a counter with a text view and want for every 15 click , to change the text in the text view and that is what i have wrote to create the counter ........ i have two text views .... one for the no. of clicks and the another for the text i want to show ,,,,,,,,,,, so i want to use "if" to set the counter to 0 (the counter is tvx) and to change the text (tvx2) to "click 15 more"
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tips_2);
btn = (Button) findViewById(R.id.bt);
txv = (TextView) findViewById(R.id.tx);
txv2 = (TextView) findViewById(R.id.tx2);
btn.setOnClickListener(new View.OnClickListener()
{
public int mCounter;
public Integer tx;
#Override
public void onClick(View v) {
mCounter++;
txv.setText(Integer.toString(mCounter));
}
});
}

#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tips_2);
btn = (Button) findViewById(R.id.bt);
txv = (TextView) findViewById(R.id.tx);
txv2 = (TextView) findViewById(R.id.tx2);
public int mCounter=0;
public Integer tx =15;
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCounter++;
if(mCounter==tx){
txv.setText(Integer.toString(mCounter));
//reset the counter after 15 click
mCounter=0
}
}
}
);
}
}

you can this way, use the ValueAnimator
public void animateText(Integer startValue, Integer endValue) {
setStartValue(startValue);
setEndValue(endValue);
ValueAnimator animator = ValueAnimator.ofInt(startValue, endValue);
animator.setInterpolator(getInterpolator());
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
String cleanString = animation.getAnimatedValue().toString().replaceAll("[,]", "");
BigDecimal parsed = new BigDecimal(cleanString);
String formatted = NumberFormat.getNumberInstance(Locale.US).format(parsed);
tv.setText(formatted);
}
});
animator.setEvaluator(new TypeEvaluator<Integer>() {
public Integer evaluate(float fraction, Integer startValue, Integer endValue) {
return Math.round(startValue + (endValue - startValue) * fraction);
}
});
animator.setDuration(getDuration());
animator.start();
}

Hello Try this if it may help
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tips_2);
btn = (Button) findViewById(R.id.bt);
txv = (TextView) findViewById(R.id.tx);
txv2 = (TextView) findViewById(R.id.tx2);
btn.setOnClickListener(new View.OnClickListener() {
public int mCounter=0;
//initialize mCounter with 0
public Integer tx;
#Override
public void onClick(View v) {
if(mCounter==15){
//check if mCounter equals 15
txv2.setText(Integer.toString("text to display after 15 click"));
//reset mCounter for another iteration
mCounter=0;
}
mCounter++;
//increment the mCounter
txv.setText(Integer.toString(mCounter));
}
});
}

I'm not really understand what do you want, but if you want to increase the counter every 15 click, just add if conditional in your code like this:
btn.setOnClickListener(new View.OnClickListener() {
public int mCounter;
public Integer tx;
#Override
public void onClick(View v) {
mCounter++;
if(mCounter == 15){
tx++;
txv.setText(String.valueOf(tx));
}
}
}
);

#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tips_2);
btn = (Button) findViewById(R.id.bt);
txv = (TextView) findViewById(R.id.tx);
txv2 = (TextView) findViewById(R.id.tx2);
btn.setOnClickListener(new View.OnClickListener() {
public int mCounter;
public Integer tx;
public int mCounter2;
#Override
public void onClick(View v) {
mCounter++;
mCounter2++;
txv.setText(""+mCounter);
if(mCounter2==15){
txv2.setText(""+mCounter2);
mCounter2=0;
}
}
}
);
}

I hope and you serve this
public class MainActivity extends AppCompatActivity {
private Button btn;
private TextView txv,txv2;
private int contador = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.bt);
txv = (TextView) findViewById(R.id.tx);
txv2 = (TextView) findViewById(R.id.tx2);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
++contador;
if(contador <= 15){
txv.setText(String.valueOf(contador));
}else{
txv2.setText("your text");
}
}
});
}
}

every button click to change text view

i coded this lines to change textview1 Continuous when user clicked button but it sucks at value 1 in output why :\
public class dobeyti extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dobeyti);
final TextView tView;
Button mButton;
tView = (TextView)findViewById(R.id.textView1);
mButton = (Button)findViewById(R.id.button);
assert mButton != null;
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int num = 0;
num++;
tView.setText(Integer.toString(num));
}
});
}
}

Becuase you defined the num value inside the onclick method so it will be reassigned to 0 every time.
Just put int num=0 outside the method like below:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dobeyti);
final TextView tView;
Button mButton;
tView = (TextView)findViewById(R.id.textView1);
mButton = (Button)findViewById(R.id.button);
assert mButton != null;
mButton.setOnClickListener(new View.OnClickListener() {
int num = 0;
#Override
public void onClick(View v) {
num++;
tView.setText(Integer.toString(num));
}
});
}
}

Move int num = 0; outside OnClickListener. Every time you click button value on variable num is set to 0 -> increased to 1 and set as text, that is why it stuck at 1.
int num = 0;
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
num++;
tView.setText(Integer.toString(num));
}
});
}
}

value of final int to int

I am currently fooling around with the android SDK (eclipse) and i am trying to make a simple button-based TicTacToe game.
I made an array where i save the Buttons and i am trying to make the ClickEvents dynamically:
Here is the Code (Which works so far):
public class MainActivity extends Activity
{
final Button[] buttons = new Button[9];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttons[0] = (Button) findViewById(R.id.button1);
buttons[1] = (Button) findViewById(R.id.button2);
buttons[2] = (Button) findViewById(R.id.button3);
buttons[3] = (Button) findViewById(R.id.button4);
buttons[4] = (Button) findViewById(R.id.button5);
buttons[5] = (Button) findViewById(R.id.button6);
buttons[6] = (Button) findViewById(R.id.button7);
buttons[7] = (Button) findViewById(R.id.button8);
buttons[8] = (Button) findViewById(R.id.button9);
for(int i = 0;i < 9;i++)
{
buttons[i].setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
//
}
});
}
}
}
The problem comes when i try to reference to a button in the onClick-Method using 'i'.
For example:
#Override
public void onClick(View arg0)
{
//buttons[0].setText("X"); works by the way
buttons[i].setText("X");
}
Eclipse tells me: "Change modifier of 'i' to final"
Well but if 'i' would be final, i wouldn't be able to increase 'i' in the loop.
So i tried this:
#Override
public void onClick(View arg0)
{
final int position = i;
buttons[position].setText("X");
}
Which ends up resulting with the same Error "Change modifier of 'i' to final"
So my Question is: How can i make this work?
I have tried google but i wasn't able to find anything and this really is the first time i ever encountered this problem .
Hope you guys can help me out!
EDIT:
Well the solution was simple, here is the now working code:
for(int i = 0;i < 9;i++)
{
final int position = i;
buttons[i].setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
buttons[position].setText("X");
}
});
}

You can do something like this:
for(int i = 0;i < 9;i++)
{
final int position = i;
buttons[i].setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
buttons[position].setText("X");
}
});
}

Create another final int var in your loop set it the same value as i and reference this var from you listeners.
for(int i = 0;i < 9;i++)
{
final int index = i;
buttons[i].setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View arg0)
{
buttons[index].setText("X");
}
});
}

Have a separate class which implements View.OnClickListener and have a constructor to accept the index value