<?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="顯示密碼" /></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){     //如果選中，顯示密碼       editText1.setTransformationMethod(HideReturnsTransformationMethod.getInstance());    }else{     //否則隱藏密碼     editText1.setTransformationMethod(PasswordTransformationMethod.getInstance());    }   }  }); }}

editText1.setTransformationMethod(HideReturnsTransformationMethod.getInstance());editText1.setTransformationMethod(PasswordTransformationMethod.getInstance());