android editText 输入字数限制

方法一：
// 输入框限制输入字数
editText.addTextChangedListener(new TextWatcher() {
private CharSequence temp;
private boolean isEdit = true;
private int selectionStart ;
private int selectionEnd ;
@Override
public void beforeTextChanged(CharSequence s, int arg1, int arg2,
int arg3) {
temp = s;
}

@Override
public void on TextChanged(CharSequence s, int arg1, int arg2,
int arg3) {
}

@Override
public void afterTextChanged(Editable s) {
selectionStart = editText.getSelectionStart();
selectionEnd = editText.getSelectionEnd();
Log.i("gongbiao1",""+selectionStart);
if (temp.length() > Constant.TEXT_MAX) {
Toast.makeText(KaguHomeActivity.this,
R.string.edit_content_limit, Toast.LENGTH_SHORT)
.show();
s.delete(selectionStart-1, selectionEnd);
int tempSelection = selectionStart;
editText.setText(s);
editText.setSelection(tempSelection);
}
}

});

方法二：
利用EditText可以设置filter的特性，自定义一个LengthFilter，当输入字数超过限制时，做出自定义的提示
// 输入框限制输入字数
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 da ta = new Bundle();
da ta.putCharSequence("source", source);
Message message = textHandler.obtainMessage();
message.setData(da ta);
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 da ta = msg.getData();
CharSequence source = da ta.getCharSequence("source");
editText.setTextColor(Color.BLACK);
editText.setText(source);
editText.setSelection(source.length());
}
};

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