EditText监听方法，实时的判断输入多少字符

[html] view plain copy<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:orientation="vertical"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   > <TextView android:id="@+id/tv"   android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:textColor="@android:color/white"    android:text="Please input the text:"   /> <EditText android:id="@+id/ET"    android:layout_width="match_parent"    android:layout_height="wrap_content"   /> </LinearLayout> 

[java] view plain copypackage com.damai.test; import android.app.Activity; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class TestActivity extends Activity {   private TextView mTextView;   private EditText mEditText;   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     mTextView = (TextView)findViewById(R.id.tv);     mEditText = (EditText)findViewById(R.id.ET);     mEditText.addTextChangedListener(mTextWatcher);   }   TextWatcher mTextWatcher = new TextWatcher() {     private CharSequence temp;     private int editStart ;     private int editEnd ;     @Override     public void onTextChanged(CharSequence s, int start, int before, int count) {       // TODO Auto-generated method stub        temp = s;     }     @Override     public void beforeTextChanged(CharSequence s, int start, int count,         int after) {       // TODO Auto-generated method stub //     mTextView.setText(s);//将输入的内容实时显示     }     @Override     public void afterTextChanged(Editable s) {       // TODO Auto-generated method stub       editStart = mEditText.getSelectionStart();       editEnd = mEditText.getSelectionEnd();       mTextView.setText("您输入了" + temp.length() + "个字符");       if (temp.length() > 10) {         Toast.makeText(TestActivity.this,             "你输入的字数已经超过了限制！", Toast.LENGTH_SHORT)             .show();         s.delete(editStart-1, editEnd);         int tempSelection = editStart;         mEditText.setText(s);         mEditText.setSelection(tempSelection);       }     }   }; }