布局里加上这一句：
android:inputType="textPassword"就好了。
方法1：:
在布局文件中设置文本编辑框属性作字符数限制，android:maxLength="10" 即限制最大输入字符个数为10。
方法2：在代码中使用InputFilter 进行过滤
public class MyActivity extends Activity
{
private EditText text;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (EditText)findViewById(R.id.text);
text .setFilters(new InputFilter[]{new InputFilter.LengthFilter(20)});
}
}
方法3：利用 TextWatcher 进行监听
继承TextWatcher接口，对输入进行监听
pblic class MaxLengthWatcher implements TextWatcher
{
private int maxLen = 0;
private EditText editText = null;
public MaxLengthWatcher(int maxLen, EditText editText) {
this.maxLen = maxLen;
this.editText = editText;
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
Editable editable = editText.getText();
int len = editable.length();
if(len > maxLen)
{
int selEndIndex = Selection.getSelectionEnd(editable);
String str = editable.toString();
//截取新字符串
String newStr = str.substring(0,maxLen);
editText.setText(newStr);
editable = editText.getText();
//新字符串的长度
int newLen = editable.length();
//旧光标位置超过字符串长度
if(selEndIndex > newLen)
{
selEndIndex = editable.length();
}
//设置新光标所在的位置
Selection.setSelection(editable, selEndIndex);
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
}
在activity中为EditText添加监听
public class MyActivity extends Activity {
private EditText text;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text = (EditText) findViewById(R.id.entry);
//限制为10
text.addTextChangedListener(new MaxLengthWatcher(10, editText));
}
}
