Android通过泛型来简化findViewById

1.通常我们通过findViewById得到View都要加个强制转换，这样感觉很麻烦，现在我们可以在BaseActivity加上如下方法通过泛型来有减少书写：

@SuppressWarnings(“unchecked”)
public final <E extends View> E getView (int id) {
    try {
        return (E) findViewById(id);
    } catch (ClassCastException e) {
        Log.e(TAG, “Could not cast View to concrete class.”, e);
        throw e;
    }
}

TextView textView = getView(R.id.textview);
Button button = getView(R.id.button);
ImageView image = getView(R.id.imageview);

//注意：如果级联调用getView 函数，则还是需要Cast转换
private static void myView (ImageView img) {
   ...
}

@Override
public void onCreate (Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // myView(getView(R.id.imageview)); //这样无法通过编译
    myView((ImageView) getView(R.id.imageview)); //需要Cast转换才可以
}