转载android AlertDialog

Posted 2020-06-14

 

ref: http://www.2cto.com/kf/201205/131876.html

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：