我有一个 EditText 实现了 TextWatcher,但是 Backspace 键有问题。
前5个字符按退格键可以一一清除,但后5个字符转换成图像不能按退格键一一清除。

看图片:

android - 按住退格键不会一一清除文本-LMLPHP

  • 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>
    
  • 最佳答案

    兄弟,有bug的代码如下:

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

    你应该把它改成这样:
    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));
    }
    

    希望有帮助。

    关于android - 按住退格键不会一一清除文本,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/37801966/

    10-10 03:11