android– 保持退格不会逐个清除文本

概述我有一个EditText实现TextWatcher但Backspace键有问题.保持退格时,前5个字符逐个清晰,但保留退格时,转换为图像的最后5个字符不能逐个清除.看图像：>MainActivity.javapublicclassMainActivityextendsAppCompatActivity{Spannable.FactoryspannableFactory;protected

我有一个EditText实现TextWatcher但Backspace键有问题.
保持退格时,前5个字符逐个清晰,但保留退格时,转换为图像的最后5个字符不能逐个清除.

看图像：

> 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;}}

> 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>

解决方法:

兄弟,有BUG的代码如下：

if (s.length() >= 5) {    editText.setText(getTextToIcon(getApplicationContext(), s));}

您应该将其更改为：

if (count != 0 && s.length() >= 5) {    // just set the text to the icon in input state instead of pressing delete key in soft method    editText.setText(getTextToIcon(getApplicationContext(), s));}

希望它有所帮助.

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