打勾显示输入的密码 --EditText与setTransformationMethod

实现目标:

实现原理:

为CheckBox添加一个监听器事件;

实现的源码:

package edu.cquptzx.showPassword;

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.EditText;

publicclass ShowPasswordActivity extends Activity {

private EditText edittext;

private CheckBox checkbox;

/** Called when the activity is first created. */

publicvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

/*find the object by IDs .*/

edittext = (EditText) findViewById(R.id.et);

checkbox = (CheckBox) findViewById(R.id.cb);

/* add a listener to the CheckBox */

checkbox.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

publicvoid onCheckedChanged(CompoundButton buttonView,boolean isChecked)

{

if(checkbox.isChecked())

{

/* show the password*/

edittext.setTransformationMethod(HideReturnsTransformationMethod.getInstance());

}

else

{

/* hide the password */

edittext.setTransformationMethod(PasswordTransformationMethod.getInstance());

}

}

});

}

}

相关知识:

最后实现效果: