android SDK开发 — TitleBar封装 (一) 点击打开链接

    这一篇讲述一下TitleBar怎么增加交互

    BaseActivity 中的逻辑实现

    1.       private ViewSwitcher[] titleSwitcher;
    3.     /**
    4.      * 初始化View
    5.      */
    6.     protected void findViewById() {
    7.         titleSwitcher = new ViewSwitcher[3];
    8.         titleSwitcher[0] = (ViewSwitcher) findViewById(R.id.app_title_left_switcher);
    9.         titleSwitcher[1] = (ViewSwitcher) findViewById(R.id.app_title_middle_switcher);
    10.         titleSwitcher[2] = (ViewSwitcher) findViewById(R.id.app_title_right_switcher);
    11.     }
    13.     protected void setTitle(TitleRes leftTitle, TitleRes middleTitle, TitleRes rightTitle) {
    14.         TitleRes[] reses = new TitleRes[] { leftTitle, middleTitle, rightTitle };
    15.         for (int i = 0; i < reses.length; i++) {
    16.             TitleRes res = reses[i];
    17.             ViewSwitcher switcher = titleSwitcher[i];
    18.             if (res == null) {
    19.                 switcher.setVisibility(View.INVISIBLE);
    20.             } else {
    21.                 switcher.setVisibility(View.VISIBLE);
    22.                 // 触发单击事件的View
    23.                 View clickView = null;
    24.                 // 文字
    25.                 if (res.getType() == 0) {
    26.                     switcher.setDisplayedChild(0);// 显示TextView
    27.                     //
    28.                     Object resource = res.getResource();
    29.                 String title = resource instanceof Integer ? getResources().getString((Integer) resource) : String.valueOf(resource);
    30.                     ((TextView) switcher.getChildAt(0)).setText(title);
    31.                     clickView = switcher.getChildAt(0);
    32.                 } else {
    33.                     switcher.setDisplayedChild(1);// 显示ImageView
    34.                     //
    35.                     int imageResource = (Integer) res.getResource();
    36.                     ((ImageView) switcher.getChildAt(1)).setImageResource(imageResource);
    37.                     clickView = switcher.getChildAt(1);
    38.                 }
    39.                 // 设置title的单击事件
    40.                 clickView.setOnClickListener(res.getClickListener());
    41.             }
    42.         }
    43.     }
    44.  
    45.

    自雷TitleSampleActivity 调用如下

    1.       @Override
    2.     protected void findViewById() {
    3.         setContentView(R.layout.title_demo);
    4.         super.findViewById();
    6.         // setTitle("返回主页", "这是一个Title", "下一个界面");
    7.         TitleRes left = new TitleRes("left", new View.OnClickListener() {
    8.             @Override
    9.             public void onClick(View v) {
    10.                 Toast.makeText(TitleDemoActivity.this, "click left", Toast.LENGTH_SHORT).show();
    11.                 //showToast("click left");
    12.             }
    13.         });
    14.         TitleRes middle = new TitleRes("middle", new View.OnClickListener() {
    15.             @Override
    16.             public void onClick(View v) {
    17.                 Toast.makeText(TitleDemoActivity.this, "click middle", Toast.LENGTH_SHORT).show();
    18.                 //showToast("click middle");
    19.             }
    20.         });
    21.         TitleRes right = new TitleRes("right", new View.OnClickListener() {
    22.             @Override
    23.             public void onClick(View v) {
    24.                 Toast.makeText(TitleDemoActivity.this, "click right", Toast.LENGTH_SHORT).show();
    25.                 //showToast("click right");
    26.             }
    27.         });
    28.         //
    29.         setTitle(left, middle, right);
    30.     }
    31.

    这个时候title三个控件都具备了交互的能力

    Toast.makeText(TitleDemoActivity.this,"click right",Toast. LENGTH_SHORT ).show();

    程序中会频繁的用到 context Toast等对象

    采用Class.this的方式在代码移植、维护、重构等方面很不友好

    另外频繁调用Toast每次都那么写的话 麻烦死

    所以BaseActivity中新增俩方法

    作用于暂且定义为protected 以后估计还得改

    1.       
    2. protected Context getContext() {
    4.     returnthis;
    6. }
    7.     
    1.       protectedvoid showToast(String message) {
    3.     Toast.*makeText*(getContext(), message,Toast.*LENGTH_SHORT*).show();
    5. }
    6.

    这个时候子类调用父类的代码如下

    1.       TitleRes left =newTitleRes("left",newView.OnClickListener() {
    3.     @Override
    5.     publicvoid onClick(View v) {
    7.         showToast("click left");//
    9.     }
    11. });
    13. 。。。。中、右略
    15. //
    17. setTitle(left,middle, right);
    18.