android 中如何限制 EditText 最大输入字符数(2)

方法四：

基本思路同方法三，监听 EditText 当中输入字符串的长度，如果超长，给出提示。

package cie.textEdit;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.util.Log;import android.widget.EditText;import android.widget.Toast;public class TextEditActivity extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);final EditText editText = (EditText)findViewById(R.id.entry);editText.addTextChangedListener(new TextWatcher(){private int selectionStart = 0;private int selectionEnd = 0;private CharSequence temp = null;public void afterTextChanged(Editable arg0) {// TODO Auto-generated method stubselectionStart = editText.getSelectionStart();selectionEnd = editText.getSelectionEnd();Log.i(myConstant.Tag,"selectionStart" + selectionStart);if(temp.length() > myConstant.TextMaxLen){Toast.makeText(TextEditActivity.this, R.string.string_limit, Toast.LENGTH_SHORT).show();arg0.delete(selectionStart-1, selectionEnd);int tempSelection = selectionStart;editText.setText(arg0);editText.setSelection(tempSelection);}}public void beforeTextChanged(CharSequence arg0, int arg1,int arg2, int arg3) {// TODO Auto-generated method stubtemp = arg0;}public void onTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {// TODO Auto-generated method stub}});}}

当文本输入字符数10个，再输入字符时，就会出现

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