I have ScroolView and it's inside Linear layout. In this linear layout i added programmically around 20 TextView. When i press any of those TextView i change it color to RED (at first it was white). When i press again the same TextView i check his color and if it's is RED i again make it white.
What i want to do:
I press for example 1 TextView and make it RED. Then when i press 2 TextView i make this one RED and i want to make 1 TextView WHITE. This functionality should be at all TextView.
So any idea's how to do this ?
You mean to say at a time you need only one textview to be red. You can do this using 2 variables. One is a boolean colored. This indicates that at least one TextView is colored. Another is a TextView variable. Create a TextView variable lastColoredTextView. Let it be null initially. Then whenever the textview is clicked, assign the lastColoredTextView to the clicked TextView. Then whenever you are clicking, just check if colored then change the color of lastColoredTextView to white.
Change class name and it will work fine.
public class Test_stflowActivity extends Activity {
TextView current_red_txt_box = null;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tv = null;
LinearLayout lp = new LinearLayout(getApplicationContext());
lp.setOrientation(LinearLayout.VERTICAL);
View.OnClickListener txt_click = new View.OnClickListener() {
#Override
public void onClick(View v) {
current_red_txt_box.setTextColor(Color.WHITE);
TextView tv = (TextView) v;
tv.setTextColor(Color.RED);
current_red_txt_box = tv;
}
};
for (int i = 0; i < 20; i++) {
tv = new TextView(getApplicationContext());
tv.setId(i);
tv.setTextSize(40);
tv.setText("you text");
tv.setTextColor(Color.WHITE);
tv.setOnClickListener(txt_click);
lp.addView(tv);
current_red_txt_box = tv;
}
setContentView(lp);
}
}
Related
I have in my program a scroll view with a linearlayout inside of it. I add dynamically TextView's to the linearlayout and I have no way to know how much TextView's I'll end up with. When a certain TextView is clicked I need to get it's text. Any idea what is the best way to do it?
Thanks in advance.
I've tried to add a listener to the text view but I am not sure how to get the text. I saw in some posts that you can do a listener to the LinearLayour/ScrollView though I am not sure what is the best option.
This happenes every time a message is added:
TextView messageText = new TextView(RecordedMessagesScreen.this);
messageText.setText(content);
messageText.setClickable(true);
messageText.setOnClickListener(RecordedMessagesScreen.this.textViewListener);
RecordedMessagesScreen.this.messagesLayout.addView(messageText);
this is the listener:
this.textViewListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent data = new Intent();
data.putExtra("message", ***NEED TO GET THE TEXT***)
}
};
At the class level declare a String variable:
private String text = "";
and a View.OnClickListener variable:
private View.OnClickListener listener;
Initialize the listener in onCreate() of your activity like this:
listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView tv = (TextView) v;
text = tv.getText().toString();
}
};
and every time you create a new TextView set the listener:
textView.setOnClickListener(listener);
This way the variable text each time you click a TextView will get the clicked TextView's text.
You can customize the code inside onClick() yo suit your needs.
I'm trying to get my button to create a text field where the user can input information. This way they can only create as many lines as they would like. Also, is there a way to create multiple fields at once?
So, it'll end up being something like this:
"Add Event" (rest of the screen is blank until they click on that button)
Text field 1/ Text field 2/ Text field 3
(once they press that button and of course without the underlines, just an example)
So they can put in information that they want there. If they want another row, they click on the add button again.
Am I supposed to be using an onClickListener? I'm confused as to how I would go about making the button create that field for the user.
public class BudgetScreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_budget_screen);
Button addBillExpense = (Button) findViewById(R.id.addBillExpense);
addBillExpense.setOnClickListener(new Button.OnClickListener() {
public void onClick (View v) {
TextView inputField = new TextView(BudgetScreen.this);
}
});
}
}
That is what I have so far. I've been stuck on this for a hot minute. I am aware that I haven't used "inputField" yet.
Suppose you have the following layout xml:
<LinearLayout ...>
<Button .../>
<LinearLayout ...
android:id="#+id/holder"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
in button onClickListener you can have something like:
LinearLayout layout = (LinearLayout) findViewById(R.id.holder);
EditText et = new EditText(this);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
layout.addView(et,lp);
You can change the LayoutParams to get the layout you like.
If you want multiple EditText in a single row, you can do the following:
final int NUM_EDITTEXT_PER_ROW = 3;
LinearLayout layout = (LinearLayout) findViewById(R.id.holder);
Display display = ((WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth()/NUM_EDITTEXT_PER_ROW;
LinearLayout tempLayout = new LinearLayout(this);
tempLayout.setOrientation(LinearLayout.HORIZONTAL);
for(int i=0;i<NUM_EDITTEXT_PER_ROW;i++){
EditText et = new EditText(this);
LayoutParams lp = new LayoutParams(width,LayoutParams.WRAP_CONTENT);
tempLayout.addView(et,lp);
}
layout.addView(tempLayout);
I'm having a problem with this code. I need to dynamically add buttons to my layout. This code works fine, with one exception. The second button sits on top of the first. This must have something to do with LayoutParams, but I'm not sure what.
private void buttonmaker (Button button)
{
RelativeLayout.LayoutParams rlayout = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
rlayout.addRule(RelativeLayout.CENTER_VERTICAL);
rlayout.addRule(RelativeLayout.ALIGN_LEFT);
rlayout.width = 100;
button.setId(Atom.count);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int id = v.getId();
atoms[id].getname();
TextView textview = (TextView)findViewById(R.id.textView2);
textview.setText(textview.getText()+String.valueOf(atoms[id].getname()));
}
});
if (Atom.count > 1) rlayout.addRule(RelativeLayout.RIGHT_OF,Atom.count-1); else rlayout.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
button.setLayoutParams(rlayout);
RelativeLayout v = (RelativeLayout) findViewById(R.id.rlayout);
v.addView(button);
}
the problem is you set de button in the relativelayout, in this component the objects are being added one above the other, you try create linearlayout global with orientation vertical or horizontal depending on what you want and added buttons, and its all
Of late I was just trying to create a mems geneator app, yes I had been following the new bostons and in that buckey created them using 2 fragments and here i just want to do in a single main activity, but I just can't figure out how to retrieve the text from the edit text field and set the text of Text view to it. I know it's pretty a newbie question but still I don't know how to code it so please help...
I had just imported some widgets,views,etc and done some modified the on create function and my on create function is:
public class MainActivity extends AppCompatActivity {
public static EditText topText;
public static EditText bottomtext;
public static TextView top;
public static TextView bottom;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
topText = (EditText) findViewById(R.id.topedit);
bottomtext = (EditText) findViewById(R.id.bottomedit);
top = (TextView) findViewById(R.id.top);
bottom = (TextView) findViewById(R.id.bottom);
Button myButton = (Button) findViewById(R.id.button);
myButton.setOnClickListener(
new Button.OnClickListener() {
public void onClick(View V) {
top.setText((CharSequence) topText);
bottom.setText((CharSequence) bottomtext);
}
}
);
}
Simply do this:
if(topText.getText()!=null){
top.setText(topText.getText().toString());
}
if(bottomtext.getText()!=null){
bottom.setText(bottomtext.getText().toString());
}
Try this to get text of the EditText field:
CharSequence text = topText.getText();
And set the text above for the textView:
top.setText(text);
Use this short example to understand the concept
store=ret.getText().toString();
show.setText(store);
Explanation
ret: is the name of the edit text field;
store: is used to hold anything gotten from ret (text field)
show.setText(store) displays the result in the textview
This question has already been answered:
"Use getText() on your EditText object".
Get Value of a Edit Text field
Next time do a quick search ;)
My problem is I have a button and that button is doing create new textview but that textviews removing when i click back button. How I saved textviews in activity?
My java sourcecodes here
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.notlar);
Button btnNotEkle = (Button) findViewById(R.id.btnNotEkle);
final EditText etNot = new EditText(NotEkle.this);
final LinearLayout layoutNotlar = (LinearLayout) findViewById(R.id.layoutNotlar);
final TextView tv1 = (TextView) findViewById(R.id.tvnotOrtalama);
etNot.setInputType(InputType.TYPE_CLASS_NUMBER);
AlertDialog.Builder notEkle = new AlertDialog.Builder(NotEkle.this);
notEkle.setTitle("Notunuz");
notEkle.setView(etNot);
//Positive button
notEkle.setPositiveButton("Tamam", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
tvNot = new TextView(NotEkle.this);//girelen not burdaki textview e yazdırılacak.
girilenNot = etNot.getText().toString();//Girilen notu alıyoruz
tvNot.setText(girilenNot);//girilen notu textviewa veriyoruz
notTopla += Integer.parseInt(girilenNot);//Notları topluyoruz
layoutNotlar.addView(tvNot);
count = layoutNotlar.getChildCount();
dersOrtalamaYazdir=String.valueOf(dersOrtalama());
tv1.setText("Ders Ortalamanız : "+dersOrtalamaYazdir);
dialog.cancel();
}
});
final AlertDialog notEkleCreate = notEkle.create();
btnNotEkle.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
notEkleCreate.show();
}
});
}
}
Try giving your TextView objects ids.
You need to know that when you click back button - by default your activity is destroyed so all views are removed.
When you are adding new TextView you should add information about this TextView (like the text itself) to some list declared as field in your activity.
Then you can save this list when activity is recreated see: onSaveInstanceState/nRestoreInstanceState
You can also pass this list back or to new activity so that they can take actions based on this list.
Following my understanding your TextView had been created inside Dialog and after you press back button the dialog dismisses and all views you created inside will be removed and you can't access it from your Activity.
You may try to create TextView in onCreate, pass and in Dialog just call setText. I hope this is the answer you're looking for.
Cheers.