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Android 提供了 AlertDialog 類可通過其內部類 Builder 輕松創建對話框窗口,但是沒法對這個對話框窗口進行定制,為了修改 AlertDialog 窗口顯示的外觀,解決的辦法就是創建一個指定的 AlertDialog 和 AlertDialog.Builder 類。

Android default Dialog

定義外觀

我們希望將上面默認的對話框外觀修改為如下圖所示的新對話框風格:

Custom Android Dialog

該對話框將支持下面特性:

  1. 可從資源或者字符串直接指定對話框標題
  2. 可從資源、字符串和自定義布局來設置對話框內容
  3. 可設置按鈕和相應的事件處理

 編寫布局、樣式和主題

該對話框使用一個定制的布局來輸出內容,布局定義的id將用于訪問標題 TextView,下面是定義文件:

01<?xml version="1.0" encoding="utf-8"?>
02 
03<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
04    android:orientation="vertical"
05    android:layout_width="fill_parent"
06    android:minWidth="280dip"
07    android:layout_height="wrap_content">
08 
09  
10    <LinearLayout
11        android:orientation="vertical"
12        android:background="@drawable/header"
13        android:layout_width="fill_parent"
14        android:layout_height="wrap_content">
15  
16        <TextView
17            style="@style/DialogText.Title"
18 
19            android:id="@+id/title"
20            android:paddingRight="8dip"
21            android:paddingLeft="8dip"
22            android:background="@drawable/title"
23            android:layout_width="wrap_content"
24 
25            android:layout_height="wrap_content"/>
26  
27    </LinearLayout>
28  
29    <LinearLayout
30        android:id="@+id/content"
31        android:orientation="vertical"
32        android:background="@drawable/center"
33 
34        android:layout_width="fill_parent"
35        android:layout_height="wrap_content">
36  
37        <TextView
38            style="@style/DialogText"
39            android:id="@+id/message"
40            android:padding="5dip"
41 
42            android:layout_width="fill_parent"
43            android:layout_height="wrap_content"/>
44  
45    </LinearLayout>
46  
47    <LinearLayout
48        android:orientation="horizontal"
49        android:background="@drawable/footer"
50 
51        android:layout_width="fill_parent"
52        android:layout_height="wrap_content">
53  
54        <Button
55            android:id="@+id/positiveButton"
56            android:layout_marginTop="3dip"
57            android:layout_width="0dip"
58 
59            android:layout_weight="1"
60            android:layout_height="wrap_content"
61            android:singleLine="true"/>
62  
63        <Button
64            android:id="@+id/negativeButton"
65 
66            android:layout_marginTop="3dip"
67            android:layout_width="0dip"
68            android:layout_weight="1"
69            android:layout_height="wrap_content"
70            android:singleLine="true"/>
71 
72  
73    </LinearLayout>
74  
75</LinearLayout>

根節點 LinearLayout 的寬度設置為 fill_parent 而最小的寬度是 280dip ,因此對話框的寬度將始終為屏幕寬度的 87.5%

自定義的主題用于聲明對話框是浮動的,而且使用自定義的背景和標題視圖:

01<?xml version="1.0" encoding="utf-8"?>
02<resources>
03  
04    <style name="Dialog" parent="android:style/Theme.Dialog">
05        <item name="android:windowBackground">@null</item>
06 
07        <item name="android:windowNoTitle">true</item>
08        <item name="android:windowIsFloating">true</item>
09    </style>
10  
11</resources>

接下來我們需要定義對話框的標題和消息的顯示:

01<?xml version="1.0" encoding="utf-8"?>
02<resources>
03  
04    <style name="DialogText">
05        <item name="android:textColor">#FF000000</item>
06 
07        <item name="android:textSize">12sp</item>
08    </style>
09  
10    <style name="DialogText.Title">
11        <item name="android:textSize">16sp</item>
12 
13        <item name="android:textStyle">bold</item>
14    </style>
15  
16</resources>

編寫對話框和 Builder 類

最好我們要提供跟 AletDialog.Builder 類一樣的方法:

001package net.androgames.blog.sample.customdialog.dialog;
002  
003import net.androgames.blog.sample.customdialog.R;
004import android.app.Dialog;
005import android.content.Context;
006import android.content.DialogInterface;
007import android.view.LayoutInflater;
008import android.view.View;
009import android.view.ViewGroup.LayoutParams;
010import android.widget.Button;
011import android.widget.LinearLayout;
012import android.widget.TextView;
013  
014/**
015 *
016 * Create custom Dialog windows for your application
017 * Custom dialogs rely on custom layouts wich allow you to
018 * create and use your own look & feel.
019 *
020 * Under GPL v3 : http://www.gnu.org/licenses/gpl-3.0.html
021 *
022 * @author antoine vianey
023 *
024 */
025public class CustomDialog extends Dialog {
026  
027    public CustomDialog(Context context, int theme) {
028        super(context, theme);
029    }
030  
031    public CustomDialog(Context context) {
032        super(context);
033    }
034  
035    /**
036     * Helper class for creating a custom dialog
037     */
038    public static class Builder {
039  
040        private Context context;
041        private String title;
042        private String message;
043        private String positiveButtonText;
044        private String negativeButtonText;
045        private View contentView;
046  
047        private DialogInterface.OnClickListener
048                        positiveButtonClickListener,
049                        negativeButtonClickListener;
050  
051        public Builder(Context context) {
052            this.context = context;
053        }
054  
055        /**
056         * Set the Dialog message from String
057         * @param title
058         * @return
059         */
060        public Builder setMessage(String message) {
061            this.message = message;
062            return this;
063        }
064  
065        /**
066         * Set the Dialog message from resource
067         * @param title
068         * @return
069         */
070        public Builder setMessage(int message) {
071            this.message = (String) context.getText(message);
072            return this;
073        }
074  
075        /**
076         * Set the Dialog title from resource
077         * @param title
078         * @return
079         */
080        public Builder setTitle(int title) {
081            this.title = (String) context.getText(title);
082            return this;
083        }
084  
085        /**
086         * Set the Dialog title from String
087         * @param title
088         * @return
089         */
090        public Builder setTitle(String title) {
091            this.title = title;
092            return this;
093        }
094  
095        /**
096         * Set a custom content view for the Dialog.
097         * If a message is set, the contentView is not
098         * added to the Dialog...
099         * @param v
100         * @return
101         */
102        public Builder setContentView(View v) {
103            this.contentView = v;
104            return this;
105        }
106  
107        /**
108         * Set the positive button resource and it's listener
109         * @param positiveButtonText
110         * @param listener
111         * @return
112         */
113        public Builder setPositiveButton(int positiveButtonText,
114                DialogInterface.OnClickListener listener) {
115            this.positiveButtonText = (String) context
116                    .getText(positiveButtonText);
117            this.positiveButtonClickListener = listener;
118            return this;
119        }
120  
121        /**
122         * Set the positive button text and it's listener
123         * @param positiveButtonText
124         * @param listener
125         * @return
126         */
127        public Builder setPositiveButton(String positiveButtonText,
128                DialogInterface.OnClickListener listener) {
129            this.positiveButtonText = positiveButtonText;
130            this.positiveButtonClickListener = listener;
131            return this;
132        }
133  
134        /**
135         * Set the negative button resource and it's listener
136         * @param negativeButtonText
137         * @param listener
138         * @return
139         */
140        public Builder setNegativeButton(int negativeButtonText,
141                DialogInterface.OnClickListener listener) {
142            this.negativeButtonText = (String) context
143                    .getText(negativeButtonText);
144            this.negativeButtonClickListener = listener;
145            return this;
146        }
147  
148        /**
149         * Set the negative button text and it's listener
150         * @param negativeButtonText
151         * @param listener
152         * @return
153         */
154        public Builder setNegativeButton(String negativeButtonText,
155                DialogInterface.OnClickListener listener) {
156            this.negativeButtonText = negativeButtonText;
157            this.negativeButtonClickListener = listener;
158            return this;
159        }
160  
161        /**
162         * Create the custom dialog
163         */
164        public CustomDialog create() {
165            LayoutInflater inflater = (LayoutInflater) context
166                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
167            // instantiate the dialog with the custom Theme
168            final CustomDialog dialog = new CustomDialog(context,
169                    R.style.Dialog);
170            View layout = inflater.inflate(R.layout.dialog, null);
171            dialog.addContentView(layout, new LayoutParams(
172                    LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
173            // set the dialog title
174            ((TextView) layout.findViewById(R.id.title)).setText(title);
175            // set the confirm button
176            if (positiveButtonText != null) {
177                ((Button) layout.findViewById(R.id.positiveButton))
178                        .setText(positiveButtonText);
179                if (positiveButtonClickListener != null) {
180                    ((Button) layout.findViewById(R.id.positiveButton))
181                            .setOnClickListener(new View.OnClickListener() {
182                                public void onClick(View v) {
183                                    positiveButtonClickListener.onClick(
184                                            dialog,
185                                            DialogInterface.BUTTON_POSITIVE);
186                                }
187                            });
188                }
189            } else {
190                // if no confirm button just set the visibility to GONE
191                layout.findViewById(R.id.positiveButton).setVisibility(
192                        View.GONE);
193            }
194            // set the cancel button
195            if (negativeButtonText != null) {
196                ((Button) layout.findViewById(R.id.negativeButton))
197                        .setText(negativeButtonText);
198                if (negativeButtonClickListener != null) {
199                    ((Button) layout.findViewById(R.id.negativeButton))
200                            .setOnClickListener(new View.OnClickListener() {
201                                public void onClick(View v) {
202                                    positiveButtonClickListener.onClick(
203                                            dialog,
204                                            DialogInterface.BUTTON_NEGATIVE);
205                                }
206                            });
207                }
208            } else {
209                // if no confirm button just set the visibility to GONE
210                layout.findViewById(R.id.negativeButton).setVisibility(
211                        View.GONE);
212            }
213            // set the content message
214            if (message != null) {
215                ((TextView) layout.findViewById(
216                        R.id.message)).setText(message);
217            } else if (contentView != null) {
218                // if no message set
219                // add the contentView to the dialog body
220                ((LinearLayout) layout.findViewById(R.id.content))
221                        .removeAllViews();
222                ((LinearLayout) layout.findViewById(R.id.content))
223                        .addView(contentView,
224                                new LayoutParams(
225                                        LayoutParams.WRAP_CONTENT,
226                                        LayoutParams.WRAP_CONTENT));
227            }
228            dialog.setContentView(layout);
229            return dialog;
230        }
231  
232    }
233  
234}

使用自定義的 Builder

使用方法很簡單:

01/**
02 * Build the desired Dialog
03 * CUSTOM or DEFAULT
04 */
05@Override
06public Dialog onCreateDialog(int dialogId) {
07    Dialog dialog = null;
08    switch (dialogId) {
09        case CUSTOM_DIALOG :
10            CustomDialog.Builder customBuilder = new
11                CustomDialog.Builder(CustomDialogActivity.this);
12            customBuilder.setTitle("Custom title")
13                .setMessage("Custom body")
14                .setNegativeButton("Cancel",
15                        new DialogInterface.OnClickListener() {
16                    public void onClick(DialogInterface dialog, int which) {
17                        CustomDialogActivity.this
18                        .dismissDialog(CUSTOM_DIALOG);
19                    }
20                })
21                .setPositiveButton("Confirm",
22                        new DialogInterface.OnClickListener() {
23                    public void onClick(DialogInterface dialog, int which) {
24                        dialog.dismiss();
25                    }
26                });
27            dialog = customBuilder.create();
28            break;
29        case DEFAULT_DIALOG :
30            AlertDialog.Builder alertBuilder = new
31                AlertDialog.Builder(CustomDialogActivity.this);
32            alertBuilder.setTitle("Default title")
33                .setMessage("Default body")
34                .setNegativeButton("Cancel",
35                        new DialogInterface.OnClickListener() {
36                    public void onClick(DialogInterface dialog, int which) {
37                        dialog.dismiss();
38                    }
39                })
40                .setPositiveButton("Confirm",
41                        new DialogInterface.OnClickListener() {
42                    public void onClick(DialogInterface dialog, int which) {
43                        CustomDialogActivity.this
44                        .dismissDialog(DEFAULT_DIALOG);
45                    }
46                });
47            dialog = alertBuilder.create();
48            break;
49    }
50    return dialog;
51}
http://code.google.com/p/androgames-sample/
http://www.open-open.com/lib/view/open1325635738437.html
posted on 2012-03-24 02:27 小果子 閱讀(7454) 評論(0)  編輯 收藏 引用 所屬分類: Android & Ios
青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品
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