Android edittext 追加和删除追加 [英] Android edittext append and remove append
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问题描述
我正在尝试制作 editText,在其中插入一些文本.每三个字符后,我想插入破折号.
I'm trying to make editText, where I am inserting some text. After each three characters,I want to insert dash.
示例:
类型:123
结果:123-
现在当光标在破折号后面并且你按下删除键时,我想删除破折号和破折号后面的字符.例如:
Now when cursor is behind dash and you press delete, I want to delete dash and character behind dash. For example:
123-
删除键后的结果:12.怎么做.谢谢你的建议.
result after delete key: 12. How to do it. Thank you for advice.
编辑
我的代码是:
EditText editText;
boolean keyDel = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText) findViewById(R.id.editText);
editText.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL) {
keyDel = true;
}
return keyDel;
}
});
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) {
String str = s.toString();
System.out.println(str.length());
if (str.length() == 3) {
str = str + "-";
} else if (str.length() == 7) {
str = str + "-";
} else if (str.length() % 4 == 0 && keyDel == true) {
str = str.substring(0, str.length() - 2);
} else {
return;
}
editText.setText(str);
editText.setSelection(editText.getText().length());
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
我发现 Android 4.4.2 和更高版本不支持 keyevent.
I found Android 4.4.2 and higer doesn´t support keyevent.
推荐答案
我的灵感来自 这个答案你想要:
I was inspired by this answer to achieve what you want:
String mTextValue;
Character mLastChar = '\0'; // init with empty character
int mKeyDel;
myEditText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
boolean flag = true;
String eachBlock[] = myEditText.getText().toString().split("-");
for (int i = 0; i < eachBlock.length; i++) {
if (eachBlock[i].length() > 4) {
flag = false;
}
}
if (flag) {
myEditText.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL)
mKeyDel = 1;
return false;
}
});
if (mKeyDel == 0) {
if (((myEditText.getText().length() + 1) % 4) == 0) {
myEditText.setText(myEditTex.getText() + "-");
myEditText.setSelection(myEditText.getText().length());
}
mTextValue = myEditText.getText().toString();
} else {
mTextValue = myEditText.getText().toString();
if (mLastChar.equals('-')) {
mTextValue = mTextValue.substring(0, mTextValue.length() - 1);
myEditText.setText(mTextValue);
myEditText.setSelection(mTextValue.length());
}
mKeyDel = 0;
}
} else {
myEditText.setText(mTextValue);
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
if (s.length()>0) {// save the last char value
mLastChar = s.charAt(s.length() - 1);
} else {
mLastChar = '\0';
}
}
@Override
public void afterTextChanged(Editable s) {}
});
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