EditText 隐藏或者显示输入内容

public class MainActivity extends Activity
{
    private EditText password=null;
    private CheckBox check=null;  

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.activity_main);
        this.password=(EditText)super.findViewById(R.id.password);
        this.check=(CheckBox)super.findViewById(R.id.check);
        //为check设置监听选项，控制密码框的显示方式
        this.check.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if(check.isChecked())
                {
                    //设置密码可见
                    password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                }
                else
                {
                    //设置密码隐藏
                    password.setTransformationMethod(PasswordTransformationMethod.getInstance());
                }
            }
        });
    }  

}