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Android 提供了 类可通过其内部类 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。
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：
该对话框将支持下面特性：
- 可从资源或者字符串直接指定对话框标题
- 可从资源、字符串和自定义布局来设置对话框内容
- 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：
1 2 38 9 10 11 16 17 18 28 2926 27 35 36 44 4542 43 50 51 58 59 66 67 68 69
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：
1 23 4 10 11
接下来我们需要定义对话框的标题和消息的显示：
1 23 4 9 10 15 16
编写对话框和 Builder 类
最好我们要提供跟 类一样的方法：
1 package net.androgames.blog.sample.customdialog.dialog; 2 3 import net.androgames.blog.sample.customdialog.R; 4 import android.app.Dialog; 5 import android.content.Context; 6 import android.content.DialogInterface; 7 import android.view.LayoutInflater; 8 import android.view.View; 9 import android.view.ViewGroup.LayoutParams; 10 import android.widget.Button; 11 import android.widget.LinearLayout; 12 import android.widget.TextView; 13 14 /** 15 * 16 * Create custom Dialog windows for your application 17 * Custom dialogs rely on custom layouts wich allow you to 18 * create and use your own look & feel. 19 * 20 * Under GPL v3 : http://www.gnu.org/licenses/gpl-3.0.html 21 * 22 * @author antoine vianey 23 * 24 */ 25 public class CustomDialog extends Dialog { 26 27 public CustomDialog(Context context, int theme) { 28 super(context, theme); 29 } 30 31 public CustomDialog(Context context) { 32 super(context); 33 } 34 35 /** 36 * Helper class for creating a custom dialog 37 */ 38 public static class Builder { 39 40 private Context context; 41 private String title; 42 private String message; 43 private String positiveButtonText; 44 private String negativeButtonText; 45 private View contentView; 46 47 private DialogInterface.OnClickListener 48 positiveButtonClickListener, 49 negativeButtonClickListener; 50 51 public Builder(Context context) { 52 this.context = context; 53 } 54 55 /** 56 * Set the Dialog message from String 57 * @param title 58 * @return 59 */ 60 public Builder setMessage(String message) { 61 this.message = message; 62 return this; 63 } 64 65 /** 66 * Set the Dialog message from resource 67 * @param title 68 * @return 69 */ 70 public Builder setMessage(int message) { 71 this.message = (String) context.getText(message); 72 return this; 73 } 74 75 /** 76 * Set the Dialog title from resource 77 * @param title 78 * @return 79 */ 80 public Builder setTitle(int title) { 81 this.title = (String) context.getText(title); 82 return this; 83 } 84 85 /** 86 * Set the Dialog title from String 87 * @param title 88 * @return 89 */ 90 public Builder setTitle(String title) { 91 this.title = title; 92 return this; 93 } 94 95 /** 96 * Set a custom content view for the Dialog. 97 * If a message is set, the contentView is not 98 * added to the Dialog... 99 * @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：
1 /** 2 * Build the desired Dialog 3 * CUSTOM or DEFAULT 4 */ 5 @Override 6 public Dialog onCreateDialog(int dialogId) { 7 Dialog dialog = null; 8 switch (dialogId) { 9 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:
Enjoy !
http://blog.androgames.net/10/custom-android-dialog/