android监听edittext输入事件

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package com.example.frametest;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.view.inputmethod.EditorInfo;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {public final  static int ANIM_COUNT = 4;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    //    setContentView(new FrameView(this));       setContentView(R.layout.main1);//              final TextView tv1 = (TextView)findViewById(R.id.monitor_text0);       final TextView tv2 = (TextView)findViewById(R.id.monitor_text1);       final TextView tv3 = (TextView)findViewById(R.id.monitor_text2);              EditText et_monitor = (EditText)findViewById(R.id.monitor_edit_text0);       et_monitor.addTextChangedListener(new TextWatcher() {@Overridepublic void onTextChanged(CharSequence str, int start, int before, int count) {// TODO Auto-generated method stub//str输入框改变后的字符信息//start 输入后字符串其实位置// before 输入后起始光标位置//一共输入的字符个数    tv1.setText("输入字符串"+str.toString()+"起始光标"+start+"一共输入"+count);}@Overridepublic void beforeTextChanged(CharSequence str, int start, int count,int after) {// TODO Auto-generated method stub   //text  输入框中改变前的字符串信息            //start 输入框中改变前的字符串的起始位置            //count 输入框中改变前后的字符串改变数量一般为0            //after 输入框中改变后的字符串与起始位置的偏移量 tv2.setText("输入前字符串 [ " + str.toString() + " ]起始光标 [ " + start + " ]结束偏移量  [" + after + " ]");}@Overridepublic void afterTextChanged(Editable edit) {// TODO Auto-generated method stub //edit  输入结束呈现在输入框中的信息            tv3.setText("输入结束后的内容为 [" + edit.toString()+" ] 即将显示在屏幕上");}});    }       }

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