BaseFragment的TitleBar封装如下

    1.       public class BaseFragment extends Fragment {
    3.     @Override
    4.     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    6.         Log.d("fragment:onCreateView", getView());
    8.         return null;
    9.     }
    11.     @Override
    12.     public void onViewCreated(View view, Bundle savedInstanceState) {
    13.         super.onViewCreated(view, savedInstanceState);
    14.         Log.d("fragment:onCreateView", getView());
    15.         findViewById();
    16.     }
    18.     private ViewSwitcher[] titleSwitcher;
    20.     /**
    21.      * 初始化View
    22.      */
    23.     protected void findViewById() {
    24.         titleSwitcher = new ViewSwitcher[3];
    25.         titleSwitcher[0] = (ViewSwitcher) findViewById(R.id.app_title_left_switcher);
    26.         titleSwitcher[1] = (ViewSwitcher) findViewById(R.id.app_title_middle_switcher);
    27.         titleSwitcher[2] = (ViewSwitcher) findViewById(R.id.app_title_right_switcher);
    28.     }
    30.     protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
    31.         TitleRes[] reses = new TitleRes[] { leftTitle, middleTitle, rightTitle };
    32.         for (int i = 0; i < reses.length; i++) {
    33.             TitleRes res = reses[i];
    34.             ViewSwitcher switcher = titleSwitcher[i];
    35.             if (res == null) {
    36.                 switcher.setVisibility(View.INVISIBLE);
    37.             } else {
    38.                 switcher.setVisibility(View.VISIBLE);
    39.                 // 触发单击事件的View
    40.                 View clickView = null;
    41.                 // 文字
    42.                 if (res.getType() == 0) {
    43.                     switcher.setDisplayedChild(0);// 显示TextView
    44.                     //
    45.                     Object resource = res.getResource();
    46.                     String title = resource instanceof Integer ? getResources().getString((Integer) resource) : String.valueOf(resource);
    47.                     ((TextView) switcher.getChildAt(0)).setText(title);
    48.                     clickView = switcher.getChildAt(0);
    49.                 } else {
    50.                     switcher.setDisplayedChild(1);// 显示ImageView
    51.                     //
    52.                     int imageResource = (Integer) res.getResource();
    53.                     ((ImageView) switcher.getChildAt(1)).setImageResource(imageResource);
    54.                     clickView = switcher.getChildAt(1);
    55.                 }
    56.                 // 设置title的单击事件
    57.                 clickView.setOnClickListener(res.getClickListener());
    58.             }
    59.         }
    60.     }
    62.     protected View findViewById(int id) {
    63.         return getView().findViewById(id);
    64.     }
    65. }
    66.

    子类调用

    1.       public class HomeFragment extends BaseFragment implements View.OnClickListener {
    3.     @Override
    4.     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    5.         View layout = inflater.inflate(R.layout.home, container, false);
    6.         super.onCreateView(inflater, container, savedInstanceState);
    7.         return layout;
    8.     }
    10.     @Override
    11.     public void onViewCreated(View view, Bundle savedInstanceState) {
    12.         super.onViewCreated(view, savedInstanceState);
    14.         findViewById(R.id.home_title_sample).setOnClickListener(this);
    16.         TitleRes left = null;
    17.         TitleRes middle = new TitleRes("首页标题");
    18.         TitleRes right = null;
    20.         setTitle(left, middle, right);
    21.     }
    22.

    可以发现跟BaseActivity 中的代码实现基本上是类似的

    但是BaseActivity和BaseFragment又没有共同的父类

    这个时候需要采用 组合的方式进行代码重构

    1.       /**
    2.  * 因为Fragment和Activity没有共同的父类 ，但是他们各自的父类里又有一些TitleBar相同的业务逻辑处理<br>
    3.  * 所以我创建了该类
    4.  * 
    5.  * @author coffee <br>
    6.  *         2015-12-24 下午10:26:10
    7.  */
    8. public class TitleMgr {
    10.     /**
    11.      * TitleBar的上下文
    12.      */
    13.     private Context context;
    14.     /**
    15.      * TitleBar所在的顶层View容易
    16.      */
    17.     private View contentView;
    19.     /**
    20.      * 三个Title
    21.      */
    22.     private ViewSwitcher[] titleSwitcher;
    24.     public TitleMgr(Context context, View contenView) {
    25.         this.context = context;
    26.         this.contentView = contenView;
    27.     }
    29.     private Resources getResources() {
    30.         return context.getResources();
    31.     }
    33.     private View findViewById(int id) {
    34.         return contentView.findViewById(id);
    35.     }
    37.     /**
    38.      * 初始化title bar
    39.      */
    40.     public void findViewById() {
    41.         titleSwitcher = new ViewSwitcher[3];
    42.         titleSwitcher[0] = (ViewSwitcher) findViewById(R.id.app_title_left_switcher);
    43.         titleSwitcher[1] = (ViewSwitcher) findViewById(R.id.app_title_middle_switcher);
    44.         titleSwitcher[2] = (ViewSwitcher) findViewById(R.id.app_title_right_switcher);
    45.     }
    47.     public void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
    48.         TitleRes[] reses = new TitleRes[] { leftTitle, middleTitle, rightTitle };
    49.         for (int i = 0; i < reses.length; i++) {
    50.             TitleRes res = reses[i];
    51.             ViewSwitcher switcher = titleSwitcher[i];
    52.             if (res == null) {
    53.                 switcher.setVisibility(View.INVISIBLE);
    54.             } else {
    55.                 switcher.setVisibility(View.VISIBLE);
    56.                 // 触发单击事件的View
    57.                 View clickView = null;
    58.                 // 文字
    59.                 if (res.getType() == 0) {
    60.                     switcher.setDisplayedChild(0);// 显示TextView
    61.                     //
    62.                     Object resource = res.getResource();
    63.                     String title = resource instanceof Integer ? getResources().getString((Integer) resource) : String.valueOf(resource);
    64.                     ((TextView) switcher.getChildAt(0)).setText(title);
    65.                     clickView = switcher.getChildAt(0);
    66.                 } else {
    67.                     switcher.setDisplayedChild(1);// 显示ImageView
    68.                     //
    69.                     int imageResource = (Integer) res.getResource();
    70.                     ((ImageView) switcher.getChildAt(1)).setImageResource(imageResource);
    71.                     clickView = switcher.getChildAt(1);
    72.                 }
    73.                 // 设置title的单击事件
    74.                 clickView.setOnClickListener(res.getClickListener());
    75.             }
    76.         }
    77.     }
    78. }
    79.     
    1.       public class BaseFragment extends Fragment {
    3.     private TitleMgr titleMgr;
    5.     @Override
    6.     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    7.         Log.d("fragment:onCreateView", getView());
    8.         return null;
    9.     }
    11.     @Override
    12.     public void onViewCreated(View view, Bundle savedInstanceState) {
    13.         super.onViewCreated(view, savedInstanceState);
    14.         Log.d("fragment:onCreateView", getView());
    15.         //
    16.         titleMgr = new TitleMgr(getActivity(), getView());
    17.         titleMgr.findViewById();
    18.     }
    20.     protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
    21.         titleMgr.setTitle(leftTitle, middleTitle, rightTitle);
    22.     }
    23.     
    1.       public abstract class BaseActivity extends Activity {
    3.     private TitleMgr titleMgr;
    5.     @Override
    6.     protected void onCreate(Bundle savedInstanceState) {
    7.         super.onCreate(savedInstanceState);
    8.         ActivityMgr.push(this);
    10.         findViewById();
    11.     }
    13.     /**
    14.      * 初始化View
    15.      */
    16.     protected void findViewById() {
    17.         titleMgr = new TitleMgr(getContext(), findViewById(android.R.id.content));
    18.         titleMgr.findViewById();
    19.     }
    21.     protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
    22.         titleMgr.setTitle(leftTitle, middleTitle, rightTitle);
    23.     }
    24.

    我把业务逻辑抽出来放在单独写好的TitleMgr类中，然后BaseActivity和BaseFragment采用组合？也算是代理模式实现吧