Checkbox(打勾显示输入的密码)
要想判断Checkbox是不是被选中，必须注册OnCheckedChangedListener。没什么难点，直接看代码。
package com.kevin.checkbox;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.EditText;public class Main extends Activity {private CheckBox chk_show;private EditText et_password; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); et_password = (EditText) findViewById(R.id.et_password); chk_show = (CheckBox) findViewById(R.id.chk_show); chk_show.setOnCheckedChangeListener(new CheckChangedListener()); } class CheckChangedListener implements OnCheckedChangeListener{@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {if(isChecked){// 设置EditText的内容为显示et_password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());}else{// 设置EditText的内容为隐藏et_password.setTransformationMethod(PasswordTransformationMethod.getInstance());}} }}