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技術社區[雲棲]
Android中EditText的輸入字數限製
在開發應用的時候，經常會限製用戶輸入的字數，比如發表評論或者其它什麼的，下麵來個簡單的demo
EditText
et_content;//定義一個文本輸入框<br>TextView
tv_num;// 用來顯示剩餘字數<br>int num = 10;//限製的最大字數 <br>
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et_content
= (EditText) findViewById(R.id.et_content);<br>tv_num = (TextView) findViewById(R.id.tv_num); <br>tv_num.setText("10");<br>
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下麵為EditText文本框添加監聽
et_content.addTextChangedListener(new TextWatcher() {
private CharSequence temp;
private int selectionStart;
private int selectionEnd;
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
temp = s;
System.out.println("s="+s);
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
int number = num - s.length();
tv_num.setText("" + number);
selectionStart = et_content.getSelectionStart();
selectionEnd = et_content.getSelectionEnd();
//System.out.println("start="+selectionStart+",end="+selectionEnd);
if (temp.length() > num) {
s.delete(selectionStart - 1, selectionEnd);
int tempSelection = selectionStart;
et_content.setText(s);
et_content.setSelection(tempSelection);//設置光標在最後
}
}
});
最後更新：2017-04-04 07:03:41