打造萬能的對話方塊Dialog(三)

已經寫了兩篇了，這下來一篇高階點的，仿照AlertDialog封裝我們想要的Dialog的對話方塊
具體那種方式跟適合你，你自己來選，不過如果只是為了簡單實用，我感覺上一篇的封裝方式也許更合適

先看圖，沒圖說個毛線

簡單介紹

前面也說了，我們這次要玩一個高階的，仿照Android系統提供AlertDialog的來寫。首先、我們怎麼著也得先看一下原始碼吧（這個自己看吧，就不帶領你們來看了）

AlertDialog原始碼總結

1、建立Builder類，這個是為了構建和設定引數的（這裡說明一下，最好是瞭解一下建造者模式

建立Builder類

public static class Builder {

        private DialogParams P;

        public Builder(Context context){
            // 如果沒有傳預設的就是自定義的主題
            this(context, 0);
        }

        public Builder(Context context,int
 
 themeResId){
            P = new DialogParams(context,themeResId);
        }


        /**
         * Set a custom view resource to be the contents of the Dialog. The
         * resource will be inflated, adding all top-level views to the screen.
         *
         * @param layoutResId Resource ID to be inflated.
         * @return
 
 this Builder object to allow for chaining of calls to set
         *         methods
         */
        public Builder setView(int layoutResId) {
            P.mView = null;
            P.mViewLayoutResId = layoutResId;
            return this;
        }

        /**
         * Sets a custom view to be the contents of the alert dialog.
         * <p>
         * When using a pre-Holo theme, if the supplied view is an instance of
         * a {@link ListView} then the light background will be used.
         * <p>
         * <strong>Note:</strong> To ensure consistent styling, the custom view
         * should be inflated or constructed using the alert dialog's themed
         * context obtained via {@link #getContext()}.
         *
         * @param view the view to use as the contents of the alert dialog
         * @return this Builder object to allow for chaining of calls to set
         *         methods
         */
        public Builder setView(View view) {
            P.mView = view;
            P.mViewLayoutResId = 0;
            return this;
        }

        /**
         * 設定寬度
         */
        public Builder setWidth(int width){
            P.mWidth = width;
            return this;
        }

        /**
         * 設定高度
         */
        public Builder setHeight(int height){
            P.mHeight = height;
            return this;
        }


        /**
         * 顯示動畫
         */
        public Builder showAnimationFromBottom(){
            P.mAnimation = R.style.main_menu_animstyle;
            P.mGravity = Gravity.BOTTOM;
            return this;
        }


        public Builder setGravity(int gravity){
            P.mGravity = gravity;
            return this;
        }

        /**
         * 顯示動畫  可以自定動畫
         */
        public Builder showAnimation(int styleResId){
            P.mAnimation = styleResId;
            return this;
        }

        public CommonDialog create() {
            // Context has already been wrapped with the appropriate theme.
            final CommonDialog dialog = new CommonDialog(P.context, P.themeResId);
            // 繫結一些引數
            dialog.apply(P);
            return dialog;
        }

建立引數類

public static class DialogParams{
            public Context context;
            public int themeResId;
            public View mView;
            public int mViewLayoutResId;
            public int mHeight = ViewGroup.LayoutParams.WRAP_CONTENT;
            public int mWidth = ViewGroup.LayoutParams.WRAP_CONTENT;
            public int mAnimation = 0;
            public int mGravity = Gravity.CENTER;

            public DialogParams(Context context, int themeResId) {
                this.context = context;
                this.themeResId = themeResId;
            }
        }

引數和對話方塊進行資料繫結

/**
     * 繫結和設定引數
     */
    private void apply(Builder.DialogParams P) {
        mDialogView = P.mView;// 資源  View

        if(mDialogView == null && P.mViewLayoutResId == 0){
            throw new NullPointerException("大哥請設定佈局!!!");
        }

        mDialogView = View.inflate(P.context,P.mViewLayoutResId,null);

        // 設定佈局
        setContentView(mDialogView);


        // 設定基本引數
        Window window = getWindow();

        window.setLayout(P.mWidth, P.mHeight);

        window.setGravity(P.mGravity);

        if(P.mAnimation != 0) {
            window.setWindowAnimations(P.mAnimation);
        }

    }

使用

findViewById(R.id.btn_center).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                CommonDialog.Builder  builder = new CommonDialog.Builder(MainActivity.this,R.style
                        .DialogTheme);
                builder.setView(R.layout.dialog_center)
                        .setGravity(Gravity.CENTER);
                CommonDialog dialog = builder.create();
                dialog.show();

            }
        });

總結

可能很多人會說，為什麼全是程式碼。一點廢話都沒有，我想說的是，也許真的是太簡單了，所以就略過白話問了。如果還是不懂，程式碼奉上。

原始碼下載

原始碼下載