通过ChekBox设置EditText内容是否呈现密码显示

1.效果图

                    

2.代码：

  

package com.example.democheckbox;

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

public class DemoCheckBox extends Activity {
    EditText et;
    CheckBox cb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo_check_box);
        et = (EditText)findViewById(R.id.ed);
        cb = (CheckBox)findViewById(R.id.cb);
        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                //设置EditText中内容可见
                if(cb.isChecked()){
                    et.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                }
                //设置EditText中内容不可见
                else{
                    et.setTransformationMethod(PasswordTransformationMethod.getInstance());
                }
                
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_demo_check_box, menu);
        return true;
    }

}

3.XML显示布局

   

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="fill_vertical"
    tools:context=".DemoCheckBox" >
    <!-- android:password="true" 设置默认输入时输入的 密码显示 -->
    
    <EditText 
        android:id="@+id/ed"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:width="200dip"
        android:hint="请输入密码"
        android:password="true"/>
    <CheckBox
        android:id="@+id/cb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="可见" 
        android:layout_below="@id/ed"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"/>   
</RelativeLayout>