TextWatcher on Android Oreo duplicate characters

Question

In my application i have a fragment with a EditText that implements a textWatcher to set a mask...It works fine Android before 27 (Oreo), but on Oreo i notice sometimes it not works properly...like it was called twice

Even if i just removeTextChangedListener, settext and addTextChangedListener again sometimes it repeats a character. If i erase a character it happens too.

etCPF.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        etCPF.removeTextChangedListener(this);
        etCPF.setText(charSequence);
        etCPF.setSelection(etCPF.getText().length());
        etCPF.addTextChangedListener(this);
     }

     @Override
     public void afterTextChanged(Editable editable) { }
});

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textNoSuggestions" />

        <Button
            android:id="@+id/btnSearch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Search" />

    </LinearLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rvResult"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

Example: If i hit as on keyboard, on edittext randonly appear as or ass

In log screen i got this:

08-07 15:22:23.053 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
08-07 15:22:23.093 1850-1850/com.google.android.inputmethod.latin W/GInputConnectionWrapper: Fixing selection indices to 1, 1
08-07 15:22:23.119 1850-1850/com.google.android.inputmethod.latin I/native: input-context-store.cc:113 Using roll back input context operation: [AbortComposing] reason: client [1219] vs decoder [1220]
08-07 15:22:23.897 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
08-07 15:22:23.898 1850-1850/com.google.android.inputmethod.latin I/native: input-context-store.cc:113 Using roll back input context operation: [AbortComposing] reason: client [1226] vs decoder [1227]
08-07 15:22:23.907 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
getTextBeforeCursor on inactive InputConnection
getTextAfterCursor on inactive InputConnection
08-07 15:22:23.910 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
08-07 15:22:23.912 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
08-07 15:22:23.913 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
getTextBeforeCursor on inactive InputConnection
08-07 15:22:23.915 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
08-07 15:22:23.916 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
08-07 15:22:23.917 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
beginBatchEdit on inactive InputConnection
getTextBeforeCursor on inactive InputConnection
08-07 15:22:23.918 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
getSelectedText on inactive InputConnection
08-07 15:22:23.919 1850-1850/com.google.android.inputmethod.latin I/native: input-context-store.cc:113 Using roll back input context operation: [AbortComposing] reason: client [1231] vs decoder [1232]
08-07 15:22:23.920 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
08-07 15:22:23.922 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
08-07 15:22:23.923 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
getTextAfterCursor on inactive InputConnection
getSelectedText on inactive InputConnection
endBatchEdit on inactive InputConnection
08-07 15:22:23.926 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
getTextBeforeCursor on inactive InputConnection
getTextAfterCursor on inactive InputConnection
getSelectedText on inactive InputConnection
08-07 15:22:23.927 7158-7158/com.alelo.mobile.gestorauto.dev W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
08-07 15:22:23.930 1850-1850/com.google.android.inputmethod.latin I/native: input-context-store.cc:113 Using roll back input context operation: [AbortComposing] reason: client [1235] vs decoder [1236]
08-07 15:22:23.949 1850-1850/com.google.android.inputmethod.latin W/GInputConnectionWrapper: Fixing selection indices to 3, 3

Anyone had this issue before?Anyone had this issue before?

If you are `onCreate` or other method than repeat when activity need rebuild what I think is because you add more than one `TextWacter` and other can't be removed because you have not the ref so what I suggest you is to put you `TextWatcher` in activity and add it when `etCPF` null you find it and add watcher. — Crammeur, Aug 07 '18 at 20:26
And if you want example I will need more code `Activity` or `Fragment` to help you — Crammeur, Aug 07 '18 at 20:59
i tested it on a Motorola device and nothing happened...but on Samsung devices and on android emulator this problem happens. — Rafael Godinho Brandão, Aug 13 '18 at 18:28

Crammeur · Answer 1 · 2018-08-07T21:24:27.700

This what a little example of what I would said in comment.

Example

if (etCPF == nul) {
    etCPF = (EditText) findViewById(R.id.editText)
    etCPF.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            etCPF.removeTextChangedListener(this);
            etCPF.setText(charSequence);
            etCPF.setSelection(etCPF.getText().length());
            etCPF.addTextChangedListener(this);
         }

         @Override
         public void afterTextChanged(Editable editable) { }
    });
}

Why this is because I think we are in lifecycle method than is repeated when Activity by example rotation and then you add many time TextWatcher. So this can explain why they many TextWatcher

TextWatcher on Android Oreo duplicate characters

1 Answers1