EditText et_content;//定義一個(gè)文本輸入框<br>TextView tv_num;// 用來顯示剩余字?jǐn)?shù)<br>int num = 10;//限制的最大字?jǐn)?shù) <br>

　　et_content = (EditText) findViewById(R.id.et_content);<br>tv_num = (TextView) findViewById(R.id.tv_num); <br>tv_num.setText("10");<br>

　　下面為EditText文本框添加監(jiān)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(shè)置光標(biāo)在最后
　　                }
　　            }
　　        });

　　這樣就可以實(shí)現(xiàn)了。

二.方法二：
利用EditText可以設(shè)置filter的特性，自定義一個(gè)LengthFilter，當(dāng)輸入字?jǐn)?shù)超過限制時(shí)，做出自定義的提示
// 輸入框限制輸入字?jǐn)?shù)
InputFilter[] filters = new InputFilter[1];
filters[0] = new InputFilter.LengthFilter(Constant.TEXT_MAX) {
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
if (source.length() > 0 && dest.length() == Constant.TEXT_MAX) {
if ((System.currentTimeMillis() - toastTime) > interval) {
toastTime = System.currentTimeMillis();
Toast
.makeText(KaguHomeActivity.this,
R.string.edit_content_limit,
Toast.LENGTH_SHORT).show();
}
}
if (dest.toString().equals(
getResources().getString(R.string.input_default_txt))) {
Bundle data = new Bundle();
data.putCharSequence("source", source);
Message message = textHandler.obtainMessage();
message.setData(data);
message.sendToTarget();
}

return super.filter(source, start, end, dest, dstart, dend);
}
};
editText.setFilters(filters);
private Handler textHandler = new Handler() {
@Override
public void handleMessage(Message msg) {

Bundle data = msg.getData();
CharSequence source = data.getCharSequence("source");
editText.setTextColor(Color.BLACK);
editText.setText(source);
editText.setSelection(source.length());
}
};