Android 密码的隐藏和显示

        <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="50dp"
           android:background="@color/white"
           android:orientation="horizontal" >           <TextView
               android:layout_width="wrap_content"
               android:layout_height="match_parent"
               android:text="新密码"
               android:textColor="@color/black"
               android:textSize="18dp"
               android:gravity="center_vertical"
               android:layout_marginLeft="15dp"/>           <EditText
               android:id="@+id/newpassword"
               android:layout_width="0dp"
               android:layout_weight="1"
               android:layout_height="match_parent"
               android:layout_gravity="center_vertical"
               android:layout_marginLeft="10dp"
               android:inputType="textPassword"
               android:hint="请设置登录密码"
               android:background="@null"/>           <CheckBox
               android:id="@+id/CheckBox"
               android:layout_width="wrap_content"
               android:layout_height="match_parent"
               android:layout_marginRight="15dp"
               android:textSize="16dp"
               android:text="显示"
               />       </LinearLayout>

android:button="@null"

/**
* Created by fby on 2017/9/11.
*/public class ChargepsdActivity extends Activity {   private EditText editText;
   private CheckBox checkBox;   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_chargepsd);       editText = (EditText) findViewById(R.id.newpassword);
       checkBox = (CheckBox) findViewById(R.id.CheckBox);       checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {               if(isChecked){
                   //如果选中，显示密码
                   editText.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
               }else{
                   //否则隐藏密码
                   editText.setTransformationMethod(PasswordTransformationMethod.getInstance());               }           }
       });   }
}