Android中实现密码的隐藏和显示的示例

    <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());

        }

      }
    });

  }
}