我有一个带TextWatcher的EditText.它应该将文本格式化为人类高度,如5’9“.但是当用户犯了错误并想删除输入错误的字符时,TextWather不允许他这样做.假设用户想删除”characther the TextWather立即加回.下面是代码.那么如何允许用户删除EditText中的文本？
private class CustomTextWatcher implements TextWatcher {
private EditText mEditText;
public CustomTextWatcher(EditText e) {
mEditText = e;
}
public void beforeTextChanged(CharSequence s,int start,int count,int after) {
}
public void onTextChanged(CharSequence s,int before,int count) {
}
public void afterTextChanged(Editable s) {
int count = s.length();
String str = s.toString();
if (count == 1) {
str = str + "'";
} else if (count == 3) {
str = str + "\"";
} else if ((count > 4) && (str.charAt(str.length() - 1) != '\"')) {
str = str.substring(0,str.length() - 2)
+ str.charAt(str.length() - 1) + "\"";
} else {
return;
}
mEditText.setText(str);
mEditText.setSelection(mEditText.getText().length());
}
}
解决方法
忽略Karakuri发布的有关您的代码处于错误回调中的事实,您可以添加一个简单的修复程序,您只需要听取用户使用的密钥.
如果没有对现有代码进行任何实际测试或进一步改进,这似乎可以解决您描述的问题：
package com.example.testwatchertest;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
public class MainActivity extends Activity implements TextWatcher {
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.addTextChangedListener(this);
editText.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v,int keyCode,KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL){
keyDel = true;
}else{
keyDel = false;
}
return false;
}
});
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s,int after) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s,int count) {
if (!keyDel) {
String str = s.toString();
if (count == 1) {
str = str + "'";
} else if (count == 3) {
str = str + "\"";
} else if ((count > 4) && (str.charAt(str.length() - 1) != '\"')) {
str = str.substring(0,str.length() - 2) + str.charAt(str.length() - 1) + "\"";
} else {
return;
}
editText.setText(str);
editText.setSelection(editText.getText().length());
}
}
}
