setTransformationMethod设置EditText内容是否可见

package com.example.demo;import android.support.v7.app.ActionBarActivity;import android.support.v7.app.ActionBar;import android.support.v4.app.Fragment;import android.text.method.HideReturnsTransformationMethod;import android.text.method.PasswordTransformationMethod;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.EditText;import android.os.Build;public class MainActivity extends ActionBarActivity {	private EditText et;	private CheckBox cb;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);				et = (EditText) findViewById(R.id.mPawwsord);		cb = (CheckBox) findViewById(R.id.cb_password);				//监听复选框点击		cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {						@Override			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {				// TODO Auto-generated method stub				if(cb.isChecked()){					//设置EditText内容为可见的					et.setTransformationMethod(HideReturnsTransformationMethod.getInstance());				}else{					//设置内容为隐藏的					et.setTransformationMethod(PasswordTransformationMethod.getInstance());				}			}		});	}}