直接上代码吧。注意导入apache commons-codec的jar包。
1、布局文件
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.hellom.MainActivity$PlaceholderFragment" > <TextView android:id="@+id/notic" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello_world" /> <TextView android:id="@+id/notic01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/notic" android:layout_below="@+id/notic" android:layout_marginTop="24dp" android:text="@string/notic01" /> <EditText android:id="@+id/textIn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/notic01" android:layout_alignBottom="@+id/notic01" android:layout_marginLeft="19dp" android:layout_toRightOf="@+id/notic01" android:ems="10" > <requestFocus /> </EditText> <TextView android:id="@+id/ciphertext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/notic01" android:layout_below="@+id/textIn" android:layout_marginTop="33dp" android:text="@string/notic02" /> <TextView android:id="@+id/ciphertext01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/ciphertext" android:layout_alignBottom="@+id/ciphertext" android:layout_alignLeft="@+id/textIn" android:layout_alignRight="@+id/textIn" android:text="" /> <TextView android:id="@+id/textOut" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/ciphertext" android:layout_marginTop="23dp" android:text="@string/notic04" /> <TextView android:id="@+id/text03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textOut" android:layout_alignLeft="@+id/ciphertext01" android:layout_alignRight="@+id/ciphertext01" android:text="" /> <Button android:id="@+id/translation01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textOut" android:layout_alignParentBottom="true" android:layout_marginBottom="97dp" android:layout_marginLeft="16dp" android:text="@string/notic03" /> <Button android:id="@+id/translation02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/translation01" android:layout_alignRight="@+id/text03" android:layout_marginRight="37dp" android:text="@string/notic05" /> </RelativeLayout>
2、mainActivity
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null)
{
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
3、fragment
public class PlaceholderFragment extends Fragment
{
//明文
public static EditText text01;
//密文
public static TextView text02;
//测试明文
public static TextView text03;
//加密事件按钮
public static Button translationBtn01;
//解密事件按钮
public static Button translationBtn02;
public PlaceholderFragment()
{
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
text01 = (EditText) rootView.findViewById(R.id.textIn);
text02 = (TextView) rootView.findViewById(R.id.ciphertext01);
text03 = (TextView) rootView.findViewById(R.id.text03);
translationBtn01 = (Button) rootView.findViewById(R.id.translation01);
translationBtn02 = (Button) rootView.findViewById(R.id.translation02);
translationBtn02.setEnabled(false);
return rootView;
}
@Override
public void onAttach(Activity activity)
{
// TODO Auto-generated method stub
super.onAttach(activity);
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
translationBtn01.setOnClickListener(new BtnOnClickListener(getActivity()));
translationBtn02.setOnClickListener(new BtnOnClickListener(getActivity()));
}
}
3、fragment中的按钮事件类（独立类的缺点是需要较多的static变量）
public class BtnOnClickListener implements OnClickListener
{
private Context context;
public BtnOnClickListener(Context context)
{
// TODO Auto-generated constructor stub
this.context = context;
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
int id = v.getId();
switch (id)
{
// 加密按钮事件按钮
case R.id.translation01:
{
if (TextUtils.isEmpty(PlaceholderFragment.text01.getText()))
{
Toast.makeText(context, "请输入需要加密的内容", Toast.LENGTH_SHORT)
.show();
} else
{
String text = PlaceholderFragment.text01.getText().toString()
.trim();
Toast.makeText(context, "开始加密", Toast.LENGTH_SHORT).show();
String text01 = new String(Hex.encodeHex(DigestUtils.md5(text)));
PlaceholderFragment.text02.setText(text01);
PlaceholderFragment.translationBtn02.setEnabled(true);
PlaceholderFragment.translationBtn01.setEnabled(false);
}
}
break;
case R.id.translation02:
{
Toast.makeText(context, "开始解密", Toast.LENGTH_SHORT).show();
PlaceholderFragment.text03.setText("MD5为不可逆加密，可尝试Base64.");
PlaceholderFragment.translationBtn02.setEnabled(false);
PlaceholderFragment.translationBtn01.setEnabled(true);
}
break;
default:
break;
}
}
}
原文：http://my.oschina.net/AaronCN/blog/401602