Android：密码显示隐藏

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword" >

        <requestFocus />
    </EditText>

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示密码" />

</LinearLayout>

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {
private TextView editText1;
private CheckBox checkBox1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
        
        editText1 =(TextView) findViewById(R.id.editText1);
        checkBox1=(CheckBox) findViewById(R.id.checkBox1);

        checkBox1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked){
                    //如果选中，显示密码      
                    editText1.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                }else{
                    //否则隐藏密码
                    editText1.setTransformationMethod(PasswordTransformationMethod.getInstance());
                }
                
            }
        });
    }

}