EditText密碼可見與不可見

這裏只當做記錄，原文請看
http://www.runoob.com/w3cnote/android-tutorial-listener-edittext-change.html

1.Java代碼

package com.jay.demo.edittextdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private EditText edit_pawd;
    private Button btnChange;
    private boolean flag = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edit_pawd = (EditText) findViewById(R.id.edit_pawd);
        btnChange = (Button) findViewById(R.id.btnChange);
        edit_pawd.setHorizontallyScrolling(true);    //設置EditText不換行
        btnChange.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(flag == true){
                    edit_pawd.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                    flag = false;
                    btnChange.setText("密碼不可見");
                }else{
                    edit_pawd.setTransformationMethod(PasswordTransformationMethod.getInstance());
                    flag = true;
                    btnChange.setText("密碼可見");
                }
            }
        });
    }
}

2.EditText背景

<?xml version="1.0" encoding="utf-8"?>  
<shape xmlns:android="http://schemas.android.com/apk/res/android" >  

    <!-- 設置透明背景色 -->  
    <solid android:color="#FFFFFF" />  

    <!-- 設置一個白色邊框 -->  
    <stroke  
        android:width="1px"  
        android:color="#FFFFFF" />  
    <!-- 設置一下邊距,讓空間大一點 -->  
    <padding  
        android:bottom="5dp"  
        android:left="5dp"  
        android:right="5dp"  
        android:top="5dp" />  

</shape>