Builder设计模式之构建万能Dialog

一. Builder设计模式
定义

将一个复杂对象的构建与它的表示分离，使得不同的构建过程可以创建不同的显示，但其根本还是不变。

使用场景

1、相同的方法，不同的执行顺序，产生不同的事件结果时；
2、多个部件或零件，都可以装配到一个对象中，但是产生的运行结果又不相同时；
3、产品类非常复杂，或者产品类中的调用顺序不同产生了不同的效能，这个时候使用建造者模式非常合适。

UML图

介绍

Product 产品类 : 产品的抽象类；
Builder : 抽象类， 规范产品的组建，一般是由子类实现具体的组件过程；
ConcreteBuilder : 具体的构建器；
Director : 统一组装过程(可省略)。

Builder设计模式的工作流程
添加参数 (P) –> 组装参数 –> 显示

二. 使用Builder设计模式构建万能Dialog

主要的对象
AlertDialog （电脑对象）
AlertDialog.Builder 规范一系列的组装过程
AlertController 具体的构建器
AlertController.AlertParams 存放参数 ， 一部分设置参数的功能
DialogViewHelper Dialog View 的辅助处理类

效果视图

实现的功能，基本囊括一般开发的需求

• 自定义布局
• 自定义弹窗宽高
• 设置弹窗位置
• 根据id设置控件的文本
• 根据id设置控件的点击事件
• 设置弹出动画效果，有默认动画

具体实现
DialogViewHelper.java

/** * @creation_time: 2017/6/26 * @author: Vegen * @e-mail: [e-mail] * @description: Dialog View 的辅助处理类 */class DialogViewHelper {    private View mContentView = null;    // WeakReference软引用，防止霸气侧漏    private SparseArray<WeakReference<View>> mViews;    public DialogViewHelper(Context mContext, int mViewLayoutResId) {        this();         // 很重要，没有就报mViews空指针        mContentView = LayoutInflater.from(mContext).inflate(mViewLayoutResId, null);    }    public DialogViewHelper() {        mViews = new SparseArray<>();    }    /**     * 设置布局     * @param contentView     */    public void setContentView(View contentView) {        this.mContentView = contentView;    }    /**     * 设置文本     * @param viewId     * @param text     */    public void setText(int viewId, CharSequence text) {        // 优化，减少findViewById的次数，做缓存        TextView tv = getView(viewId);        if (tv != null){            tv.setText(text);        }    }    public  <T extends View> T getView(int viewId) {        WeakReference<View> viewWeakReference = mViews.get(viewId);        View view = null;        if (viewWeakReference != null){            view = viewWeakReference.get();        }        if (view == null){            view = mContentView.findViewById(viewId);            if (view != null) {                mViews.put(viewId, new WeakReference<>(view));            }        }        return (T) view;    }    /**     * 设置点击事件     * @param viewId     * @param listener     */    public void setOnClickListener(int viewId, View.OnClickListener listener) {        View view = getView(viewId);        if (view != null){            view.setOnClickListener(listener);        }    }    /**     * 获取ContentView     * @return     */    public View getContentView() {        return mContentView;    }}

AlertController.java

/** * @creation_time: 2017/6/26 * @author: Vegen * @e-mail: [e-mail] * @description: 具体的构建器 */class AlertController {    private AlertDialog mDialog;    private Window mWindow;    private DialogViewHelper mViewHelper;    /**     * 获取Dialog     * @return     */    public AlertDialog getDialog() {        return mDialog;    }    /**     * 获取Dialog的Window     * @return     */    public Window getWindow() {        return mWindow;    }    public AlertController(AlertDialog dialog, Window window) {        this.mDialog = dialog;        this.mWindow = window;    }    /**     * 设置文本     * @param viewId     * @param text     */    public void setText(int viewId, CharSequence text) {        mViewHelper.setText(viewId, text);    }    public  <T extends View> T getView(int viewId) {        return mViewHelper.getView(viewId);    }    /**     * 设置点击事件     * @param viewId     * @param listener     */    public void setOnClickListener(int viewId, View.OnClickListener listener) {        mViewHelper.setOnClickListener(viewId, listener);    }    public void setViewHelper(DialogViewHelper viewHelper) {        this.mViewHelper = viewHelper;    }    public static class AlertParams{        public Context mContext;        public int mThemeResId;        // 点击空白地方是否能够取消,默认能        public boolean mCancelable = true;        // dialog Cancel监听        public DialogInterface.OnCancelListener mOnCancelListener;        // dialog 消失监听        public DialogInterface.OnDismissListener mOnDismissListener;        // dialog 按键监听        public DialogInterface.OnKeyListener mOnKeyListener;        // 布局 View        public View mView;        // 布局 layout id        public int mViewLayoutResId;        // 存放字体的修改        public SparseArray<CharSequence> mTextArray = new SparseArray<>();        // 存放点击时间 WeakReference软引用，优化，防止内存泄漏        public SparseArray<View.OnClickListener> mClickArray = new SparseArray<>();        // Dialog 的宽度        public int mWidth = ViewGroup.LayoutParams.WRAP_CONTENT;        // 动画        public int mAnimations = 0;        // 位置        public int mGravity = Gravity.CENTER;        // Dialog 的高度        public int mHeight = ViewGroup.LayoutParams.WRAP_CONTENT;        public AlertParams(Context context, int themeResId) {            this.mContext = context;            this.mThemeResId = themeResId;        }        /**         * 绑定和设置参数         * @param mAlert         */        public void apply(AlertController mAlert) {            // 设置参数            // 1.设置Dialog布局 DialogViewHelper            DialogViewHelper viewHelper = null;            if (mViewLayoutResId != 0){                viewHelper = new DialogViewHelper(mContext, mViewLayoutResId);            }            if (mView != null){                viewHelper = new DialogViewHelper();                viewHelper.setContentView(mView);            }            if (viewHelper == null){                throw new IllegalArgumentException("请设置布局setContentView()");            }            // 给Dialog 设置布局            mAlert.getDialog().setContentView(viewHelper.getContentView());            // 设置 Controller的辅助类            mAlert.setViewHelper(viewHelper);            // 2.设置文本            int textArraySize = mTextArray.size();            for (int i = 0; i < textArraySize; i ++){                mAlert.setText(mTextArray.keyAt(i), mTextArray.valueAt(i));            }            // 3.设置点击            int clickArraySize = mClickArray.size();            for (int i = 0; i < clickArraySize; i ++){                mAlert.setOnClickListener(mClickArray.keyAt(i), mClickArray.valueAt(i));            }            // 4.配置自定义的效果 全屏 从底部弹出  默认动画            Window window = mAlert.getWindow();            // 设置位置            window.setGravity(mGravity);            // 设置动画            if (mAnimations != 0) {                window.setWindowAnimations(mAnimations);            }            // 设置宽高            WindowManager.LayoutParams params = window.getAttributes();            params.width = mWidth;            params.height = mHeight;            window.setAttributes(params);        }    }}

AlertDialog.java，自定义的万能Dialog（参考系统的AlertDialog）

/** * @creation_time: 2017/6/26 * @author: Vegen * @e-mail: [e-mail] * @description: 自定义的万能Dialog */public class AlertDialog extends Dialog {    private AlertController mAlert;    public AlertDialog(@NonNull Context context, @StyleRes int themeResId) {        super(context, themeResId);        mAlert = new AlertController(this, getWindow());    }    /**     * 设置文本     * @param viewId     * @param text     */    public void setText(int viewId, CharSequence text) {        mAlert.setText(viewId, text);    }    public  <T extends View> T getView(int viewId) {        return mAlert.getView(viewId);    }    /**     * 设置点击事件     * @param viewId     * @param listener     */    public void setOnClickListener(int viewId, View.OnClickListener listener) {        mAlert.setOnClickListener(viewId, listener);    }    public static class Builder{        private final AlertController.AlertParams P;        /**         * Creates a builder for an alert dialog that uses the default alert         * dialog theme.         * <p>         * The default alert dialog theme is defined by         * {@link android.R.attr#alertDialogTheme} within the parent         * {@code context}'s theme.         *         * @param context the parent context         */        public Builder(Context context) {            this(context, R.style.dialog);        }        /**         * Creates a builder for an alert dialog that uses an explicit theme         * resource.         * <p>         * The specified theme resource ({@code themeResId}) is applied on top         * of the parent {@code context}'s theme. It may be specified as a         * style resource containing a fully-populated theme, such as         * {@link android.R.style#Theme_Material_Dialog}, to replace all         * attributes in the parent {@code context}'s theme including primary         * and accent colors.         * <p>         * To preserve attributes such as primary and accent colors, the         * {@code themeResId} may instead be specified as an overlay theme such         * as {@link android.R.style#ThemeOverlay_Material_Dialog}. This will         * override only the window attributes necessary to style the alert         * window as a dialog.         * <p>         * Alternatively, the {@code themeResId} may be specified as {@code 0}         * to use the parent {@code context}'s resolved value for         * {@link android.R.attr#alertDialogTheme}.         *         * @param context the parent context         * @param themeResId the resource ID of the theme against which to inflate         *                   this dialog, or {@code 0} to use the parent         *                   {@code context}'s default alert dialog theme         */        public Builder(Context context, int themeResId) {            P = new AlertController.AlertParams(context, themeResId);        }        /**         * 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 } 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;        }        /**         * 设置布局内容的layout id         * @param layoutResId         * @return         */        public Builder setContentView(int layoutResId) {            P.mView = null;            P.mViewLayoutResId = layoutResId;            return this;        }        /**         * 设置文本         * @param viewId         * @param text         * @return         */        public Builder setText(int viewId, CharSequence text){            P.mTextArray.put(viewId, text);            return this;        }        /**         * 设置点击事件         * @param view         * @param listener         * @return         */        public Builder setOnClickListener(int view, View.OnClickListener listener){            P.mClickArray.put(view, listener);            return this;        }        /**         * Sets the callback that will be called if the dialog is canceled.         *         * <p>Even in a cancelable dialog, the dialog may be dismissed for reasons other than         * being canceled or one of the supplied choices being selected.         * If you are interested in listening for all cases where the dialog is dismissed         * and not just when it is canceled, see         * {@link #setOnDismissListener(android.content.DialogInterface.OnDismissListener) setOnDismissListener}.</p>         * @see #setCancelable(boolean)         * @see #setOnDismissListener(android.content.DialogInterface.OnDismissListener)         *         * @return This Builder object to allow for chaining of calls to set methods         */        public Builder setOnCancelListener(OnCancelListener onCancelListener) {            P.mOnCancelListener = onCancelListener;            return this;        }        /**         * Sets the callback that will be called when the dialog is dismissed for any reason.         *         * @return This Builder object to allow for chaining of calls to set methods         */        public Builder setOnDismissListener(OnDismissListener onDismissListener) {            P.mOnDismissListener = onDismissListener;            return this;        }        /**         * Sets the callback that will be called if a key is dispatched to the dialog.         *         * @return This Builder object to allow for chaining of calls to set methods         */        public Builder setOnKeyListener(OnKeyListener onKeyListener) {            P.mOnKeyListener = onKeyListener;            return this;        }        /**         * 全屏         * @return         */        public Builder fullWidth(){            P.mWidth = ViewGroup.LayoutParams.MATCH_PARENT;            return this;        }        /**         * 从底部弹出         * @param isAnimation 是否添加动画         * @return         */        public Builder formBottom(boolean isAnimation){            if (isAnimation){                P.mAnimations = R.style.dialog_from_bottom_anim;            }            P.mGravity = Gravity.BOTTOM;            return this;        }        /**         * 设置宽高         * @param width         * @param height         * @return         */        public Builder setWidthAndHeight(int width, int height){            P.mWidth = width;            P.mHeight = height;            return this;        }        /**         * 添加默认动画         * @return         */        public Builder addDefaultAnimation(){            P.mAnimations = R.style.dialog_scale_anim;            return this;        }        /**         * 添加动画         * @param styleAnimation         * @return         */        public Builder setAnimations(int styleAnimation){            P.mAnimations = styleAnimation;            return this;        }        /**         * Creates an {@link AlertDialog} with the arguments supplied to this         * builder.         * <p>         * Calling this method does not display the dialog. If no additional         * processing is needed, {@link #show()} may be called instead to both         * create and display the dialog.         */        public AlertDialog create() {            // Context has already been wrapped with the appropriate theme.            final AlertDialog dialog = new AlertDialog(P.mContext, P.mThemeResId);            P.apply(dialog.mAlert);            dialog.setCancelable(P.mCancelable);            if (P.mCancelable) {                dialog.setCanceledOnTouchOutside(true);            }            dialog.setOnCancelListener(P.mOnCancelListener);            dialog.setOnDismissListener(P.mOnDismissListener);            if (P.mOnKeyListener != null) {                dialog.setOnKeyListener(P.mOnKeyListener);            }            return dialog;        }        /**         * Creates an {@link AlertDialog} with the arguments supplied to this         * builder and immediately displays the dialog.         * <p>         * Calling this method is functionally identical to:         * <pre>         *     AlertDialog dialog = builder.create();         *     dialog.show();         * </pre>         */        public AlertDialog show() {            final AlertDialog dialog = create();            dialog.show();            return dialog;        }    }}

示例的弹窗布局：detail_comment_dialog.xml

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/root_view"    android:layout_width="fill_parent"    android:layout_height="wrap_content">    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="@color/comment_dialog_bg"        android:orientation="vertical"        android:padding="10.0dip">        <EditText            android:id="@+id/comment_editor"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:background="@drawable/bg_detail_comment_editor"            android:hint="@string/ss_share_hint"            android:maxHeight="120.0dip"            android:padding="9.0dip"            android:textColor="@color/comment_dialog_content_text"            android:textSize="16.0sp" />        <LinearLayout            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginTop="10.0dip"            android:gravity="center_vertical">            <TextView                android:id="@+id/share_label"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_centerVertical="true"                android:layout_marginRight="10.0dip"                android:text="@string/comment_dialog_share_label"                android:textColor="@color/comment_dialog_share_text"                android:textSize="13.0sp" />            <LinearLayout                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1">                <ImageView                    android:id="@+id/account_icon_weibo"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:src="@mipmap/account_icon_weibo" />                <ImageView                    android:id="@+id/account_icon_tencent"                    android:layout_width="wrap_content"                    android:layout_marginLeft="10dp"                    android:layout_height="wrap_content"                    android:src="@mipmap/account_icon_tencent" />            </LinearLayout>            <LinearLayout                android:id="@+id/platform_layout"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_toRightOf="@id/share_label"                android:orientation="horizontal" />            <TextView                android:id="@+id/submit_btn"                android:layout_width="50.0dip"                android:layout_height="25.0dip"                android:layout_alignParentRight="true"                android:layout_centerVertical="true"                android:background="@drawable/bg_comment_submit"                android:gravity="center"                android:text="@string/comment_dialog_send"                android:textColor="@color/comment_dialog_submit_text"                android:textSize="13.0sp" />            <TextView                android:id="@+id/text_limit"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_centerVertical="true"                android:layout_marginRight="10.0dip"                android:layout_toLeftOf="@id/submit_btn"                android:textSize="13.0sp"                android:visibility="invisible" />        </LinearLayout>    </LinearLayout></FrameLayout>

MainActivity.java

public class MainActivity extends BaseActivity {    @ViewById(R.id.test)    private Button mTest;    @Override    protected void initData() {        mTest.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                // 一行代码就可以搞掂！                AlertDialog dialog = new AlertDialog.Builder(MainActivity.this)                        .setContentView(R.layout.detail_comment_dialog)                        .setText(R.id.submit_btn, "发送")                        .setOnClickListener(R.id.account_icon_weibo, new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        Toast.makeText(MainActivity.this, "微博分享", Toast.LENGTH_SHORT).show();                    }                }).show();            }        });    }    @Override    protected void initView() {    }    @Override    protected void initTitle() {    }    @Override    protected void setContentView() {        setContentView(R.layout.activity_main);    }}

代码简单的就不贴了，注释写得很详细，也不作讲解。失恋了，很伤心，决定好好学习，天天向上~~刷一大波代码安慰一下自己！
放暑假了，求实习！