Huo Chhunleng Huo Chhunleng - 4 months ago 12
Android Question

Hold on backspace doesn't clear text one by one

I have an EditText implements TextWatcher but have a problem with Backspace key.
The first 5 characters are clear one by one when hold on backspace, but the last 5 characters that convert to image cannot clear one by one when hold on backspace.

Look the image :

enter image description here


  1. MainActivity.java

    public class MainActivity extends AppCompatActivity {
    Spannable.Factory spannableFactory;

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    spannableFactory = Spannable.Factory
    .getInstance();

    final EditText editText = (EditText) findViewById(R.id.editText);
    editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    editText.removeTextChangedListener(this);
    if (s.length() >= 5) {
    editText.setText(getTextToIcon(getApplicationContext(), s));
    }
    if(count!=0){ // != key delete
    if (s.length() - 1 > start) {
    editText.setSelection(start + 1);
    } else {
    editText.setSelection(s.length());
    }
    }else{ // = key delete
    editText.setSelection(start);
    }

    editText.addTextChangedListener(this);
    }

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


    public Spannable getTextToIcon(Context context, CharSequence text) {
    StringBuilder stringBuilder = new StringBuilder(text);
    Spannable spannable = spannableFactory.newSpannable(stringBuilder);
    int index = text.length() - 1;
    for(int i = 5; i<=index; i++){
    spannable.setSpan(new ImageSpan(context, android.R.drawable.star_on),
    i, i + 1,
    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
    return spannable;
    }
    }

  2. activity_main.xml

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

    <EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:maxLength="10"
    android:inputType="number" />
    </LinearLayout>


Answer

Now I found a solution from this link http://stackoverflow.com/a/10954719/5887320 Hope it will help other.

editText.addTextChangedListener( new TextWatcher() {
        boolean isEdiging;
        @Override public void onTextChanged(CharSequence s, int start, int before, int count) { }
        @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { }

        @Override public void afterTextChanged(Editable s) {
            if(isEdiging) return;
            isEdiging = true;

            String str = s.toString().replaceAll("[^\\d]", "");
            double s1 = 0;
            try {
                s1 = Double.parseDouble(str);
            }catch (NumberFormatException e){
                e.printStackTrace();
            }


            NumberFormat nf2 = NumberFormat.getInstance(Locale.ENGLISH);
            ((DecimalFormat)nf2).applyPattern("###,###.###");
            s.replace(0, s.length(), nf2.format(s1));

            isEdiging = false;
        }
    });
}
Comments