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自定义 Android 对话框 (AlertDialog) 的样式

Android 提供了 AlertDialog 类可通过其内部类 Builder 轻松创建对话框窗口，但是没法对这个对话框窗口进行定制，为了修改 AlertDialog 窗口显示的外观，解决的办法就是创建一个指定的 AlertDialog 和 AlertDialog.Builder 类。

Android default Dialog

定义外观

我们希望将上面默认的对话框外观修改为如下图所示的新对话框风格：

Custom Android Dialog

该对话框将支持下面特性：

  1. 可从资源或者字符串直接指定对话框标题
  2. 可从资源、字符串和自定义布局来设置对话框内容
  3. 可设置按钮和相应的事件处理

 编写布局、样式和主题

该对话框使用一个定制的布局来输出内容，布局定义的id将用于访问标题 TextView，下面是定义文件：

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>

根节点 LinearLayout 的宽度设置为 fill_parent 而最小的宽度是 280dip ，因此对话框的宽度将始终为屏幕宽度的 87.5%

自定义的主题用于声明对话框是浮动的，而且使用自定义的背景和标题视图：

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>

接下来我们需要定义对话框的标题和消息的显示：

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>

编写对话框和 Builder 类

最好我们要提供跟 AletDialog.Builder 类一样的方法：

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}

使用自定义的 Builder

使用方法很简单：

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}

完整的代码下载: SampleCustomDialog

Enjoy !


悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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