refer:http://www.2cto.com/kf/201205/131876.html
AlertDialog的構造方法全部是Protected的，所以不能直接通過new一個AlertDialog來創建出一個AlertDialog。
要創建一個AlertDialog，就要用到AlertDialog.Builder中的create()方法。
使用AlertDialog.Builder創建對話框需要了解以下幾個方法：
setTitle ：為對話框設置標題
setIcon ：為對話框設置圖標
setMessage：為對話框設置內容
setView ： 給對話框設置自定義樣式
setItems ：設置對話框要顯示的一個list，一般用於顯示幾個命令時
setMultiChoiceItems ：用來設置對話框顯示一系列的復選框
setNeutralButton ：普通按鈕
setPositiveButton ：給對話框添加"Yes"按鈕
setNegativeButton ：對話框添加"No"按鈕
create ： 創建對話框
show ：顯示對話框
一、簡單的AlertDialog
下面，創建一個簡單的ALertDialog並顯示它：
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.os.Bundle;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("對話框的標題").
setMessage("對話框的內容").
setIcon(R.drawable.ic_launcher).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.os.Bundle;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("對話框的標題").
setMessage("對話框的內容").
setIcon(R.drawable.ic_launcher).
create();
alertDialog.show();
}
}運行結果如下：
二、帶按鈕的AlertDialog
上面的例子很簡單，下面我們在這個AlertDialog上面加幾個Button，實現刪除操作的提示對話框
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("確定刪除？").
setMessage("您確定刪除該條信息嗎？").
setIcon(R.drawable.ic_launcher).
setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNeutralButton("查看詳情", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("確定刪除？").
setMessage("您確定刪除該條信息嗎？").
setIcon(R.drawable.ic_launcher).
setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNeutralButton("查看詳情", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}在這個例子中，我們定義了三個按鈕，分別是"Yes"按鈕，"No"按鈕以及一個普通按鈕，每個按鈕都有onClick事件，TODO的地方可以放點了按鈕之后想要做的一些處理
看一下運行結果：
可以看到三個按鈕添加到了AlertDialog上，三個沒有添加事件處理的按鈕，點了只是關閉對話框，沒有任何其他操作。
三、類似ListView的AlertDialog
用setItems(CharSequence[] items, final OnClickListener listener)方法來實現類似ListView的AlertDialog
第一個參數是要顯示的數據的數組，第二個參數是點擊某個item的觸發事件
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setItems(arrayFruit, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setItems(arrayFruit, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}運行結果如下：
四、類似RadioButton的AlertDialog
用setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)方法來實現類似RadioButton的AlertDialog
第一個參數是要顯示的數據的數組，第二個參數是初始值（初始被選中的item），第三個參數是點擊某個item的觸發事件
在這個例子里面我們設了一個selectedFruitIndex用來記住選中的item的index
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
private int selectedFruitIndex = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
selectedFruitIndex = which;
}
}).
setPositiveButton("確認", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
private int selectedFruitIndex = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
selectedFruitIndex = which;
}
}).
setPositiveButton("確認", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
運行結果如下：
五、類似CheckBox的AlertDialog
用setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)方法來實現類似CheckBox的AlertDialog
第一個參數是要顯示的數據的數組，第二個參數是選中狀態的數組，第三個參數是點擊某個item的觸發事件
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
arrayFruitSelected[which] = isChecked;
}
}).
setPositiveButton("確認", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < arrayFruitSelected.length; i++) {
if (arrayFruitSelected[i] == true)
{
stringBuilder.append(arrayFruit[i] + "、");
}
}
Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };
final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("你喜歡吃哪種水果？").
setIcon(R.drawable.ic_launcher)
.setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
arrayFruitSelected[which] = isChecked;
}
}).
setPositiveButton("確認", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < arrayFruitSelected.length; i++) {
if (arrayFruitSelected[i] == true)
{
stringBuilder.append(arrayFruit[i] + "、");
}
}
Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}運行結果如下：
六、自定義View的AlertDialog
有時候我們不能滿足系統自帶的AlertDialog風格，就比如說我們要實現一個Login畫面，有用戶名和密碼，這時我們就要用到自定義View的AlertDialog
先創建Login畫面的布局文件
[html] <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<TextView
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/user" />
<EditText
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<TextView
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/passward" />
<EditText
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<TextView
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/user" />
<EditText
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<TextView
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/passward" />
<EditText
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
然后在Activity里面把Login畫面的布局文件添加到AlertDialog上
[java] package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 取得自定義View
LayoutInflater layoutInflater = LayoutInflater.from(this);
View myLoginView = layoutInflater.inflate(R.layout.login, null);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("用戶登錄").
setIcon(R.drawable.ic_launcher).
setView(myLoginView).
setPositiveButton("登錄", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}
package com.tianjf;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
public class Dialog_AlertDialogDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 取得自定義View
LayoutInflater layoutInflater = LayoutInflater.from(this);
View myLoginView = layoutInflater.inflate(R.layout.login, null);
Dialog alertDialog = new AlertDialog.Builder(this).
setTitle("用戶登錄").
setIcon(R.drawable.ic_launcher).
setView(myLoginView).
setPositiveButton("登錄", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).
create();
alertDialog.show();
}
}運行結果如下：
摘自 殤雲的專欄