I want to create this textview, and then display it after this button is clicked, but no textview is displayed.
I dont't want to use findViewById(), if possible, because I want to create a new textview every time the button is pressed. I've tried making a linear layout first, but I've seen a lot of websites say that you don't need to, and I would prefer not to. Any advice would be helpful. Thank you.
EditText name=layout.findViewById(R.id.enterName);
final String Name=name.getText().toString();
Button create=layout.findViewById(R.id.create);
create.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TextView ProgrammaticallyTextView = new TextView(MainActivity.this);
ProgrammaticallyTextView.setText(Name);
ProgrammaticallyTextView.setTextSize(22);
popup.dismiss();
}
});
There are no error messages and the logcat doesn't say that anything is wrong.
Try like this :
private LinearLayout lLayout;
private EditText lEditText;
private Button lButton;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lLayout = (LinearLayout) findViewById(R.id.linearLayout);
lButton = (Button) findViewById(R.id.button);
lEditText = (EditText) findViewById(R.id.editText);
lButton.setOnClickListener(onClick());
TextView textView = new TextView(this);
textView.setText("Text New");
}
private OnClickListener onClick() {
return new OnClickListener() {
#Override
public void onClick(View v) {
lLayout.addView(createTextView(lEditText.getText().toString()));
}
};
}
private TextView createTextView(String text) {
final LayoutParams loutParams = new
LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
final TextView textView = new TextView(this);
textView.setLayoutParams(loutParams );
textView.setText("Text is " + text);
return textView;
}
Use the activity's findViewById() method to reference your layout views. For example, you can replace
EditText name=layout.findViewById(R.id.enterName);
Button create=layout.findViewById(R.id.create);
with
EditText name=getActivity().findViewById(R.id.enterName);
Button create=getActivity().layout.findViewById(R.id.create);
Note: if you are not using fragments then there is no need to use getActivity since findViewById() is a method of the superclass AppCompactActvity( or Activity).
I guess your code is not working because the Button View and Editext Views have not been reference when activity starts for the oncreate() method
Related
I tried to build an easy Android App using Java and, obviously, Android studio. After adding an OnClickListener the app keeps crashing on the emulator.
public class MainActivity extends AppCompatActivity {
EditText first = findViewById(R.id.firstInput);
EditText second = findViewById(R.id.secondInput);
EditText result = findViewById(R.id.result);
private Button add;
private View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
clicked();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
add = new Button(this);
add.setOnClickListener(onClickListener);
};
void clicked(){
int i = Integer.parseInt(first.getText().toString());
int z = Integer.parseInt(second.getText().toString());
int r = i + z;
result.setText(r);
}
};
Wrong location of object declaration
It should be below the setContentView
EditText first = findViewById(R.id.firstInput);
EditText second = findViewById(R.id.secondInput);
EditText result = findViewById(R.id.result);
Button haven't added to the layout
add = new Button(this);
addContentView(add, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
Note: This is impractical, you should have added this on your layout xml unless you wanted to create dynamic layout
Warning issue of setting a text by integer
From:
result.setText(r);
To:
result.setText(String.valueOf(r));
Trying to create notes application. I am trying to add dynamic text view after button click and it should be added to layout, one after another. In my code, only one text view is getting added successfully but from second time, app got crashed. Please help
XML Code:
<EditText
android:id="#+id/text_thingsToDo"
android:layout_width="#dimen/ThingsToDo_EditText_Width"
android:layout_height="#dimen/ThingsToDo_EditText_Height"
android:layout_margin="#dimen/Standardize_Margin"
android:background="#color/ThingsToDo_EditText_Color"/>
<Button
android:id="#+id/save_thingsToDo"
android:layout_toRightOf="#+id/text_thingsToDo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/ThingsToDo_Save_Button_Text"
android:layout_marginRight="#dimen/Standardize_Margin"
android:layout_marginTop="#dimen/Standardize_Margin"
android:layout_marginBottom="#dimen/Standardize_Margin"
android:background="#color/ThingsToDo_Save_Button"
android:textColor="#color/White"
android:layout_centerVertical="true"/>
Java Code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_things_to_do);
final EditText editText = (EditText) findViewById(R.id.text_thingsToDo);
Button button = (Button) findViewById(R.id.save_thingsToDo);
final TextView notesView = new TextView(this);
final LinearLayout linearLayout = (LinearLayout) findViewById(R.id.rootView_ThingsToDo);
final ArrayList<String> arrayList = new ArrayList<String>();
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
notesView.setText(editText.getText().toString());
linearLayout.addView(notesView);
}
});
}
Perhaps create a new TextView every time you press the button? Try to declare the TextView as a class member and then in your OnClickListener do this:
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
notesView = new TextView(this);
notesView.setText(editText.getText().toString());
linearLayout.addView(notesView);
}
});
Hopefully this will fix your problem!
I want to make image button in java class without using XML(dynamic UI).
I can make this but I can't connect to onClick void.
Can anybody help me?
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);
LayoutParams params =
new TableRow.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
TableRow table = new TableRow(this);
table.setOrientation(TableRow.VERTICAL);
ImageButton ib = new ImageButton(this);
ib.setImageResource(R.drawable.one);
ib.setLayoutParams(params);
table.addView(ib);
TableRow.LayoutParams layoutParams=
new TableRow.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT );
this.addContentView(table, layoutParams);
}
public void onClick(View v){
Toast.makeText(getBaseContext(),"This button clicked",Toast.LENGTH_SHORT).show();
}
you missed ib.setOnClickListener(...);. If your activity implements View.OnClickListener then it would be
ib.setOnClickListener(this);
You need to assign OnClickListener before using it
If you are implementing OnClickListener in the activity then use (I believe you are because you have onClick method defined)
ib.setOnClickListener(this);
If not then do this
ib.setOnClickListener(new View.OnClickListener()
{
public void onClick(){
// Do as required
}
});
I have an EditText, and when a button is clicked, I want the text to be displayed on the screen. And the EditText can be used again to add other text and on and on. Thanks!
Something like:
EditText et = (EditText)findviewById(R.id.et1);
TextView display = (TextView)findviewById(R.id.tv1);
plusBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
tv1.setText(tv.getText().toString()+"\n"+et.getText().toString());
//prints the text from edittext and concatinates it to the textview previous text
}
});
Please use below code for that, it will solve your problem.
EditText editText1 = (EditText)findviewById(R.id.editText1);
TextView textView1 = (TextView)findviewById(R.id.textView1);
plusBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
textView1.append("\n"+editText1.getText().toString());
// OR
textView1.setText(textView1.getText().toString()+"\n"+editText1.getText().toString());
}
});
You can add Views to your Layout by using its addView() Method. So you could add a TextView upon each button-click which contains the content of your TextField.
I'm trying to create a view where the user can click a "plus" button, and have additional EditTexts be created. The goal is to have a base of 2 EditTexts, and each time the user clicks the button, add another 2 EditTexts.
How can I do this? I can add EditTexts from Java, but I can't figure out how to add and handle a list of them dynamically.
I was hoping to take however many pairs of EditTexts, and push it into a key/value HashMap or something.
Any ideas of how to do this? Thanks!
public class MyActivity extends Activity {
private LinearLayout main;
private int id = 0;
private List<EditText> editTexts = new ArrayList<EditText>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
main = new LinearLayout(this);
main.setOrientation(LinearLayout.VERTICAL);
Button addButton = new Button(this);
addButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
addEditText();
}
});
Button submit = new Button(this);
submit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
for (EditText editText : editTexts) {
editText.getText().toString();
// whatever u want to do with the strings
}
}
});
main.addView(addButton);
main.addView(submit);
setContentView(main);
}
private void addEditText() {
LinearLayout editTextLayout = new LinearLayout(this);
editTextLayout.setOrientation(LinearLayout.VERTICAL);
main.addView(editTextLayout);
EditText editText1 = new EditText(this);
editText1.setId(id++);
editTextLayout.addView(editText1);
editTexts.add(editText1);
EditText editText2 = new EditText(this);
editText2.setId(id++);
editTextLayout.addView(editText2);
editTexts.add(editText2);
}
Do it in a ListView.
Then you can just add them to a ListAdapter.
And then use adapter.notifyDatasetChanged()
May be I am not clear but Instead of adding Individual edit text you can add as Group View like Linear layout here you can use any flag values to add dynamic name conversions also.
That view you can update into List View like inflating rows in the List View....