在開發中，有的需要密碼的隱藏和顯示，這裡直接程式碼展示，很簡單：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id
 
="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="輸入密碼"
        android:inputType="textPassword" />
    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height
 
="wrap_content"
        android:text="顯示密碼" />

</LinearLayout>

public class MainActivity extends Activity {
private EditText editText;
private CheckBox checkBox;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editText =(EditText) findViewById(R.id.editText1);
        checkBox=(CheckBox) findViewById(R.id.checkBox1);

        checkBox.setOnCheckedChangeListener(new
 
 OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked){
                    //如果選中，顯示密碼      
                    editText.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
                }else{
                    //否則隱藏密碼
                    editText.setTransformationMethod(PasswordTransformationMethod.getInstance());

                }

            }
        });
    }

}