Builder设计模式构建整个Android应用的NavigationBar

参考：

http://www.jianshu.com/p/570d8bddb5c0
http://www.jianshu.com/p/87288925ee1f

定义导航条规范

public interface INavigation {
    // 绑定布局ID
    public int bindLayoutId();
    // 给View设置参数
    public void applyView();
}

构建AbsNavigationBar

public abstract class AbsNavigationBar<P extends AbsNavigationBar.Builder.NavigationParams> implements INavigation {

    private P params;
    private View view;

    public AbsNavigationBar(P params) {
        this.params = params;
        createAndBind();
    }
    protected String getString(int id) {
        return this.params.context.getResources().getString(id);
    }
    protected int getColor(int id) {
        return ContextCompat.getColor(this.params.context, id);
    }
    protected P getParams() {
        return params;
    }

    /**
     * 设置文本
     * @param viewId
     * @param text
     */
    protected void setText(int viewId, CharSequence text) {
        TextView tv = findViewById(viewId);
        if (tv != null) {
            tv.setText(text);
        }
    }
    /**
     * 设置点击事件
     * @param viewId
     * @param listener
     */
    protected void setOnClickListener(int viewId, View.OnClickListener listener) {
        View view = findViewById(viewId);
        if (view != null) {
            view.setOnClickListener(listener);
        }
    }
    /**
     * 设置背景资源
     * @param viewId
     * @param resourceId
     */
    protected void setImageResource(int viewId, int resourceId) {
        ImageView imageView = findViewById(viewId);
        if (imageView != null) {
            imageView.setImageResource(resourceId);
        }
    }
    protected <T extends View> T findViewById(int id) {
        return (T) view.findViewById(id);
    }

    /**
     * 创建和绑定布局
     */
    public void createAndBind() {
        if (params == null) {
            return;
        }
        view = LayoutInflater.from(params.context).inflate(bindLayoutId(), params.parent, false);
        params.parent.addView(view, 0);
        applyView();
    }
    // 构建导航条类 这个类只是定义默认的配置 具体功能的实现一定由具体的实现类决定
    public abstract static class Builder {
        // 构建导航条方法
        public abstract AbsNavigation create();
        // 默认的配置参数
        public static class NavigationParams {
            public Context context;
            public ViewGroup parent;
            public NavigationParams(Context context, ViewGroup parent) {
                this.context = context;
                this.parent = parent;
            }
        }
    }
}

构建DefaultNavigationBar

public class DefaultNavigation<D extends AbsNavigation.Builder.NavigationParams> extends
        AbsNavigation<DefaultNavigation.Builder.DefaultNavigationParams> {
    public DefaultNavigation(Builder.DefaultNavigationParams params) {
        super(params);
    }

    @Override
    public void applyView() {
        // 给我们的导航条绑定资源
        setImageResource(R.id.iv_left, getParams().leftIconRes);
        setImageResource(R.id.iv_right, getParams().rightIconRes);
        setImageResource(R.id.iv_right_icon, getParams().textRightIconRes);
        setText(R.id.title_tv, getParams().title);
        setText(R.id.left_tv, getParams().leftTv);
        setText(R.id.right_tv, getParams().rightTv);
        setBackgroundColor(R.id.title_bar, getParams().bgColor);
        setOnClickListener(R.id.left_ll, getParams().leftOnClickListener);
        setOnClickListener(R.id.right_ll, getParams().rightOnClickListener);
    }

    @Override
    public int bindLayoutId() {
        // 绑定布局layoutId
        return R.layout.navigation_default;
    }

    // 构建导航条类
    public static class Builder extends AbsNavigation.Builder {
        private DefaultNavigationParams params;

        public Builder(Context context, ViewGroup parent) {
            params = new DefaultNavigationParams(context, parent);
        }

        public Builder setTitle(String title) {
            params.title = title;
            return this;
        }

        public Builder setRight(String right) {
            params.rightTv = right;
            return this;
        }

        public Builder setLeft(String left) {
            params.leftTv = left;
            return this;
        }

        public Builder setLeftIcon(int iconRes) {
            params.leftIconRes = iconRes;
            return this;
        }

        public Builder setRightIcon(int iconRes) {
            params.rightIconRes = iconRes;
            return this;
        }

        public Builder setTitleBackgroundColor(int bgColor) {
            params.bgColor = bgColor;
            return this;
        }

        public Builder setLeftOnClickListener(View.OnClickListener onClickListener) {
            params.leftOnClickListener = onClickListener;
            return this;
        }

        public Builder setRightOnClickListener(View.OnClickListener onClickListener) {
            params.rightOnClickListener = onClickListener;
            return this;
        }

        @Override
        public DefaultNavigation<NavigationParams> create() {
            DefaultNavigation<NavigationParams> navigation = new DefaultNavigation<NavigationParams>(params);
            return navigation;
        }

        // 默认的配置参数
        public static class DefaultNavigationParams extends NavigationParams {
            //标题
            public String title;
            //左边图片资源
            public int leftIconRes;
            //右边图片资源
            public int rightIconRes;
            //左边的点击事件
            public View.OnClickListener leftOnClickListener;
            //右边的点击事件
            public View.OnClickListener rightOnClickListener;
            public String leftTv;
            public String rightTv;
            public int bgColor;

            public DefaultNavigationParams(Context context, ViewGroup parent) {
                super(context, parent);
            }
        }
    }
}

使用

DefaultNavigationBar navigationBar = new DefaultNavigation.Builder(this,
                (ViewGroup) findViewById(android.R.id.content))
                .setLeftIcon(R.drawable.common_back).setTitle("投稿").setRightText("发表").create();