Why does my app crash when I click the floating action button?

Question

My app crash when I am clicking the button, I don't know why it does that and I don't know how to fix it.

fab.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
            mLayout.addView(createNewEditText(mEditText.getText().toString()));
        }
    });

private EditText createNewEditText(String text) {
    ConstraintLayout mConstraintLayout  = (ConstraintLayout) findViewById(R.id.planlaeg_l);
    ConstraintSet set = new ConstraintSet();
    EditText et = new EditText(this);
    mConstraintLayout.addView(et,0);
    set.clone(mConstraintLayout);
    set.connect(et.getId(), ConstraintSet.TOP, mConstraintLayout.getId(), ConstraintSet.TOP, 60);
    set.applyTo(mConstraintLayout);
    et.setText(text);
    return et;
}

Does this answer your question? [Unfortunately MyApp has stopped. How can I solve this?](https://stackoverflow.com/questions/23353173/unfortunately-myapp-has-stopped-how-can-i-solve-this) — OneCricketeer, Dec 10 '19 at 09:26
If you want see the error try to add this `try{//your code}catch(Exception ee){Toast.makeText(getApplicationContext(),ee.getMessage(),Toast.LENGTH_LONG).show()}` — Cyrille Con Morales, Dec 10 '19 at 09:27
did you attach a view to "mLayout" and "mEditText" , like mLayout = findViewById(R.id.mLayout); ? I feel like it's a NullPointerException — Walid, Dec 10 '19 at 09:27
If you are using android studio see the `Logcat` tab at the bottom of the screen. The red text is the stacktrace — jared, Dec 10 '19 at 09:32

duongdt3 · Accepted Answer · 2019-12-11T03:50:42.277

1

I think you got an error like that "java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first."

Step 1:

mConstraintLayout.addView(et,0);
Step 2:

return et;
Step 3:

mLayout.addView(createNewEditText(mEditText.getText().toString()));

How to fix it:

Change logic add et view (in method createNewEditText / outside it)

Example:

fab.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            createNewEditText(mEditText.getText().toString());
        }
    });

edited Dec 11 '19 at 03:50

answered Dec 10 '19 at 09:32

duongdt3

1,648
11
16

I really don't understand what you want me to do because im very new to making apps. – Jensen711 Dec 10 '19 at 09:46
@Jensen711 I edit my answer with an example solution, try it! – duongdt3 Dec 11 '19 at 03:51
Unfortunately still crashes – Jensen711 Dec 11 '19 at 07:31

Why does my app crash when I click the floating action button?

1 Answers1