Builder模式创建万能NavigationBar

创建INavigationBar接口

public interface INavigationBar {
    /**
     * 绑定布局
     *
     * @return i
     */
    int bindLayoutId();

    /**
     * 绑定view
     */
    void applyView();
}

创建AbsNavigationBar基类

public abstract class AbsNavigationBar<P extends AbsNavigationBar.Builder.AbsNavigationParams> implements INavigationBar {
    private final P mParams;
    private View mNavigationView;

    public AbsNavigationBar(P params) {
        this.mParams = params;
        createAndBindView();
    }

    public P getParams() {
        return mParams;
    }

    /**
     * 设置文字
     *
     * @param viewId i
     * @param text   t
     */
    protected void setText(int viewId, String text) {
        TextView textView = findViewById(viewId);
        if (!TextUtils.isEmpty(text)) {
            textView.setVisibility(View.VISIBLE);
            textView.setText(text);
        }
    }

    /**
     * 设置图标
     *
     * @param viewId i
     * @param resId  i
     */
    protected void setIcon(int viewId, int resId) {
        ImageView imageView = findViewById(viewId);
        if (resId != 0) {
            imageView.setVisibility(View.VISIBLE);
            imageView.setImageResource(resId);
        }
    }

    /**
     * 设置点击事件
     *
     * @param viewId   i
     * @param listener l
     */
    protected void setOnclickListener(int viewId, View.OnClickListener listener) {
        findViewById(viewId).setOnClickListener(listener);
    }

    public <T extends View> T findViewById(int viewId) {
        return mNavigationView.findViewById(viewId);
    }

    /**
     * 绑定和创建view
     */
    private void createAndBindView() {
        //创建view
        if (mParams.mParent == null) {
            //获取activity的根布局
            ViewGroup activityRoot = (ViewGroup) ((Activity) (mParams.mContext)).getWindow().getDecorView();
            mParams.mParent = (ViewGroup) activityRoot.getChildAt(0);
        }
        if (mParams.mParent == null) {
            return;
        }
        mNavigationView = LayoutInflater.from(mParams.mContext)
                .inflate(bindLayoutId(), mParams.mParent, false);
        //添加
        mParams.mParent.addView(mNavigationView, 0);
        applyView();
    }

    @Override
    public int bindLayoutId() {
        return 0;
    }

    @Override
    public void applyView() {
    }

    public abstract static class Builder {
        /**
         * 创建方法
         *
         * @return b
         */
        public abstract AbsNavigationBar build();

        public Builder(Context context, ViewGroup parent) {
        }

        public static class AbsNavigationParams {
            public Context mContext;
            public ViewGroup mParent;

            public AbsNavigationParams(Context context, ViewGroup parent) {
                this.mContext = context;
                this.mParent = parent;
            }
        }
    }
}

创建默认的DefaultNavigationBar

public class DefaultNavigationBar extends AbsNavigationBar<DefaultNavigationBar.Builder.DefaultNavigationParams> {
    public DefaultNavigationBar(DefaultNavigationBar.Builder.DefaultNavigationParams params) {
        super(params);
    }

    @Override
    public int bindLayoutId() {
        return R.layout.title_bar;
    }

    @Override
    public void applyView() {
        //绑定效果
        setText(R.id.title, getParams().mTitle);
        setText(R.id.right_text, getParams().mRightText);
        setIcon(R.id.left_icon, getParams().mLeftIcon);
        setIcon(R.id.right_icon, getParams().mRightIcon);
        setOnclickListener(R.id.right_text, getParams().mRightClickListener);
        setOnclickListener(R.id.left_text, getParams().mLeftClickListener);
    }

    public static class Builder extends AbsNavigationBar.Builder {
        DefaultNavigationParams P;

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

        public Builder(Context context) {
            super(context, null);
            P = new DefaultNavigationParams(context, null);
        }

        @Override
        public DefaultNavigationBar build() {
            return new DefaultNavigationBar(P);
        }

        //设置所有效果
        public DefaultNavigationBar.Builder setTitle(String title) {
            P.mTitle = title;
            return this;
        }

        public DefaultNavigationBar.Builder setRightText(String rightText) {
            P.mRightText = rightText;
            return this;
        }

        public DefaultNavigationBar.Builder setRightIcon(int rightIcon) {
            P.mRightIcon = rightIcon;
            return this;
        }

        public DefaultNavigationBar.Builder setLeftText(String leftText) {
            P.mLeftText = leftText;
            return this;
        }

        public DefaultNavigationBar.Builder setLeftIcon(int leftIcon) {
            P.mLeftIcon = leftIcon;
            return this;
        }

        public DefaultNavigationBar.Builder setRightClickListener(View.OnClickListener listener) {
            P.mRightClickListener = listener;
            return this;
        }

        public DefaultNavigationBar.Builder setLeftClickListener(View.OnClickListener listener) {
            P.mLeftClickListener = listener;
            return this;
        }

        public static class DefaultNavigationParams extends
                AbsNavigationBar.Builder.AbsNavigationParams {
            //放置所有的效果
            public String mTitle;
            public String mRightText;
            public String mLeftText;
            public int mRightIcon;
            public int mLeftIcon;

            public View.OnClickListener mRightClickListener;
            public View.OnClickListener mLeftClickListener = view -> {
                ((Activity) mContext).finish();
            };

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

使用方法

new DefaultNavigationBar.Builder(this)
                        .setTitle("标题")
                        .setRightText("发布")
                        .setLeftText("返回")
                        .setLeftIcon(R.mipmap.ic_launcher)
                        .setRightClickListener(v -> showToast("发布"))
                        .build();