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{

		@Override
		public 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());
			}
		}
    	
    }
}