Android的AlertDialog详解（7种方式）

需要注意的两点：

1. 在setIcon时，需要使用setTitle方法，否则icon不会显示

2.如果同时调用setMessage 和 setItems(或者setSingleChoiceItems setMultiChoiceItems)函数会导致dialog没有显示内容

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AlertDialog的构造方法全部是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创建对话框需要了解以下几个方法：

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    ：普通按钮

setPositiveButton   ：给对话框添加"Yes"按钮 setNegativeButton ：对话框添加"No"按钮 create ： 创建对话框 show ：显示对话框 一、简单的AlertDialog

下面，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 {      /** 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("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 {  /** 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("对话框的标题").     setMessage("对话框的内容").     setIcon(R.drawable.ic_launcher).     create();   alertDialog.show();  } }运行结果如下：

二、带按钮的AlertDialog

上面的例子很简单，下面我们在这个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 {      /** 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("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 {  /** 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("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();  } }在这个例子中，我们定义了三个按钮，分别是"Yes"按钮，"No"按钮以及一个普通按钮，每个按钮都有onClick事件，TODO的地方可以放点了按钮之后想要做的一些处理

看一下运行结果：

可以看到三个按钮添加到了AlertDialog上，三个没有添加事件处理的按钮，点了只是关闭对话框，没有任何其他操作。

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

第一个参数是要显示的数据的数组，第二个参数是点击某个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 {      /** 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[] { "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 {  /** 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[] { "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();  } }运行结果如下：

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

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

在这个例子里面我们设了一个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;            /** 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[] { "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;    /** 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[] { "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();  } }

运行结果如下：

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 第一个参数是要显示的数据的数组，第二个参数是选中状态的数组，第三个参数是点击某个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 {      /** 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[] { "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 {  /** 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[] { "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();  } }运行结果如下：

六、自定义View的AlertDialog 有时候我们不能满足系统自带的AlertDialog风格，就比如说我们要实现一个Login画面，有用户名和密码，这时我们就要用到自定义View的AlertDialog

先创建Login画面的布局文件

[html]                                                                                    

然后在Activity里面把Login画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 {  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);

  // 取得自定义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();  } }运行结果如下：