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());
}

}
});
}

}

editText1.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

editText1.setTransformationMethod(PasswordTransformationMethod.getInstance());