<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  ><TextView  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="@string/hello"  /> <EditText  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:inputType="textPassword"  android:id="@+id/mima" /> <CheckBox android:text="顯示密碼"  android:layout_width="wrap_content"  android:layout_height="wrap_content" android:id="@+id/xianshifou"/></LinearLayout>

public class M extends Activity {  private EditText et;  private CheckBox cb;  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    et=(EditText)findViewById(R.id.mima);    cb=(CheckBox)findViewById(R.id.xianshifou);    cb.setOnCheckedChangeListener(new OnCheckedChangeListener(){      @Override      public void onCheckedChanged(CompoundButton arg0, boolean arg1) {        // TODO Auto-generated method stub        if(cb.isChecked()){          //設置EditText的密碼為可見的          et.setTransformationMethod(HideReturnsTransformationMethod.getInstance());        }else{          //設置密碼為隱藏的          et.setTransformationMethod(PasswordTransformationMethod.getInstance());        }      }    });  }}