android中的AlertDialog具体概述

android的AlertDialog具体解释

AlertDialog的构造方法所有是Protected的。所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。

要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法。

使用AlertDialog.Builder创建对话框须要了解下面几个方法：

setTitle ：为对话框设置标题

setIcon ：为对话框设置图标

setMessage：为对话框设置内容

setView ： 给对话框设置自己定义样式

setItems ：设置对话框要显示的一个list。一般用于显示几个命令时

setMultiChoiceItems ：用来设置对话框显示一系列的复选框

setNeutralButton    ：普通button

setPositiveButton   ：给对话框加入"Yes"button

setNegativeButton ：对话框加入"No"button

create ： 创建对话框

show ：显示对话框

一、简单的AlertDialog

以下，创建一个简单的ALertDialog并显示它：

[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 { 

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("对话框的标题"). 

                setMessage("对话框的内容"). 

                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 {

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("对话框的标题").

    setMessage("对话框的内容").

    setIcon(R.drawable.ic_launcher).

    create();

  alertDialog.show();

 }

}执行结果例如以下：

二、带button的AlertDialog

上面的样例非常easy，以下我们在这个AlertDialog上面加几个Button，实现删除操作的提示对话框

[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 { 

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("确定删除？"). 

                setMessage("您确定删除该条信息吗？"). 

                setIcon(R.drawable.ic_launcher). 

                setPositiveButton("确定", 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("查看详情", 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 {

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("确定删除？").

    setMessage("您确定删除该条信息吗？").

    setIcon(R.drawable.ic_launcher).

    setPositiveButton("确定", 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("查看详情", new DialogInterface.OnClickListener() {

     

     @Override

     public void onClick(DialogInterface dialog, int which) {

      // TODO Auto-generated method stub

     }

    }).

    create();

  alertDialog.show();

 }

}在这个样例中，我们定义了三个button，各自是"Yes"button，"No"button以及一个普通button，每一个button都有onClick事件，TODO的地方能够放点了button之后想要做的一些处理

看一下执行结果：

能够看到三个button加入到了AlertDialog上，三个没有加入事件处理的button。点了仅仅是关闭对话框，没有不论什么其它操作。

三、类似ListView的AlertDialog

用setItems(CharSequence[] items, final OnClickListener listener)方法来实现类似ListView的AlertDialog

第一个參数是要显示的数据的数组。第二个參数是点击某个item的触发事件

[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 { 

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" }; 

 

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("你喜欢吃哪种水果？"). 

                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 {

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("你喜欢吃哪种水果？").

    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();

 }

}执行结果例如以下：

四、类似RadioButton的AlertDialog

用setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)方法来实现类似RadioButton的AlertDialog

第一个參数是要显示的数据的数组，第二个參数是初始值（初始被选中的item），第三个參数是点击某个item的触发事件

在这个样例里面我们设了一个selectedFruitIndex用来记住选中的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; 

     

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" }; 

 

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("你喜欢吃哪种水果？"). 

                setIcon(R.drawable.ic_launcher) 

                .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() { 

  

                    @Override 

                    public void onClick(DialogInterface dialog, int which) { 

                        selectedFruitIndex = which; 

                    } 

                }). 

                setPositiveButton("确认", 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;

 

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("你喜欢吃哪种水果？").

    setIcon(R.drawable.ic_launcher)

    .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {

 

     @Override

     public void onClick(DialogInterface dialog, int which) {

      selectedFruitIndex = which;

     }

    }).

    setPositiveButton("确认", 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();

 }

}

执行结果例如以下：

五、类似CheckBox的AlertDialog

用setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)方法来实现类似CheckBox的AlertDialog

第一个參数是要显示的数据的数组，第二个參数是选中状态的数组。第三个參数是点击某个item的触发事件

[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 { 

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" }; 

        final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false}; 

 

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("你喜欢吃哪种水果？"). 

                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("确认", 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 {

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };

  final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};

Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("你喜欢吃哪种水果？").

    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("确认", 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();

 }

}执行结果例如以下：

六、自己定义View的AlertDialog

有时候我们不能满足系统自带的AlertDialog风格，就比方说我们要实现一个Login画面，实username和password，这时我们就要用到自己定义View的AlertDialog

先创建Login画面的布局文件

[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画面的布局文件加入到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 { 

     

    @Override 

    public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        setContentView(R.layout.main); 

 

        // 取得自己定义View  

        LayoutInflater layoutInflater = LayoutInflater.from(this); 

        View myLoginView = layoutInflater.inflate(R.layout.login, null); 

         

        Dialog alertDialog = new AlertDialog.Builder(this). 

                setTitle("用户登录"). 

                setIcon(R.drawable.ic_launcher). 

                setView(myLoginView). 

                setPositiveButton("登录", 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 {

 

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

// 取得自己定义View

  LayoutInflater layoutInflater = LayoutInflater.from(this);

  View myLoginView = layoutInflater.inflate(R.layout.login, null);

  

  Dialog alertDialog = new AlertDialog.Builder(this).

    setTitle("用户登录").

    setIcon(R.drawable.ic_launcher).

    setView(myLoginView).

    setPositiveButton("登录", 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();

 }

}执行结果例如以下：