java EditText - 键入时更改文本
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10862657/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
EditText - change text while typing
提问by Issam Zoli
I need to replace the text inside the EditText while typing : Example : if the user pressed "A" it would be stored into a buffer and on the EditText "D" is displayed instead (looks like he pressed "D"). Now I can read the pressed character but I can't display any character in the et to avoid stackoverflow :
我需要在键入时替换 EditText 中的文本：例如：如果用户按下“A”，它将被存储到缓冲区中，并在 EditText 上显示“D”（看起来他按下了“D”）。现在我可以读取按下的字符，但我不能在 et 中显示任何字符以避免计算溢出：
final EditText et = (EditText) findViewById(R.id.editTexts);
final TextView tv = (TextView) findViewById(R.id.textView2);
et.addTextChangedListener(new TextWatcher()
{
public void afterTextChanged(Editable s){}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(s.length() > 0) {
tv.setText(s.toString().substring(s.length()-1));
et.setText("");
}
}
});
回答by Shankar Agarwal
You can change it as required::
您可以根据需要更改它::
public class SampleActivity extends Activity {
TextWatcher tt = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText et = (EditText) findViewById(R.id.editText1);
final TextView tv = (TextView) findViewById(R.id.textView1);
tt = new TextWatcher() {
public void afterTextChanged(Editable s){
et.setSelection(s.length());
}
public void beforeTextChanged(CharSequence s,int start,int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count) {
et.removeTextChangedListener(tt);
et.setText(et.getText().toString().replace("A", "C"));
et.addTextChangedListener(tt);
}
};
et.addTextChangedListener(tt);
}
}
回答by abedfar
In order to change the text interactively, you need to register a TextWatcher. But trying to change the text inside the watcher creates further calls to the watcher. My hack is to temporarily remove the watcher when I want to change the text, and re-register it right after
为了以交互方式更改文本，您需要注册一个TextWatcher. 但是尝试更改观察者内部的文本会进一步调用观察者。我的技巧是在我想更改文本时暂时删除观察者，然后立即重新注册
mEditText.addTextChangedListener(new TextWatcher() {
@Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { }
@Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { }
@Override public void afterTextChanged(Editable editable) {
mEditText.removeTextChangedListener(this);
mEditText.setText(//TODO change whatever you like here);
mEditText.setSelection(editable.length()); //moves the pointer to end
mEditText.addTextChangedListener(this);
}
