Android 密码 显示与隐藏功能实例

<?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());
    }
   }
  });
 }
}

edittext1.settransformationmethod(hidereturnstransformationmethod.getinstance());
edittext1.settransformationmethod(passwordtransformationmethod.getinstance());