Android Dialog种类大全，让Activity显示在另外一个Activity之上

AlertDialog(对话框)---简单对话框:

AlertDialog生成的对话框可以分为四个区域

图标区，标题区，内容区，按钮区
步骤：1、创建AlertDialog.Builder对象
2、调用AlertDialog.Builder的setTitle设置标题
3、调用AlertDialog.Builder的setIcon方法设置图片
4、AlertDialog.Builder的setMessage设置内容
5、调用AlertDialog.Builder的setPositiveButton设置确定按钮,setNegativeButton设置取消按钮
6、调用AlertDialog.Builder的show方法

简单alertDialog

<span style="font-size:14px;">import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.example.android_lb_day4_ui.R;

public class AletDialogTest extends Activity {
       @Override
       protected void onCreate(Bundle savedInstanceState) {
             // TODO Auto-generated method stub
             super.onCreate(savedInstanceState);
            setContentView(R.layout. activity_alertdialog);

      }

       public void simple(View v) {
            AlertDialog.Builder bulider = new AlertDialog.Builder(this);
            bulider.setTitle( "简单对话框" ); // 设置标题
            bulider.setIcon(R.drawable. ic_launcher); // 设置标题左边的图片
            bulider.setMessage( "对话框测试内容\n第二行内容" ); // 设置显示的消息
            bulider.setPositiveButton( "确定", new OnClickListener() {

                   @Override
                   public void onClick(DialogInterface dialog, int which) {
                         // TODO Auto-generated method stub
                        Toast. makeText(getApplicationContext(), "确定",
                                    Toast. LENGTH_SHORT).show();
                  }
            });
            bulider. setNegativeButton("取消", new OnClickListener() {

                   @Override
                   public void onClick(DialogInterface dialog, int which) {
                         // TODO Auto-generated method stub
                        Toast. makeText(getApplicationContext(), "取消",
                                    Toast. LENGTH_SHORT).show();
                  }
            });
            bulider.show();
      }

}</span><span style="color: rgb(255, 0, 0); font-size: 19px;">
</span>

// 消息对话框
public void simple(View
v) {
AlertDialog.Builder bulider = new AlertDialog.Builder(this);
bulider.setTitle( "简单消息对话框" ); //
设置标题
bulider.setIcon(R.drawable. ic_launcher); //
设置标题左边的图片
bulider.setMessage( "简单消息提示框...\n第二行的消息" );
setPositiveButton(bulider);
setNegativeButton(bulider);
bulider.show();
}
//
列表对话框
public void simpleList(View
v) {
AlertDialog.Builder bulider = new AlertDialog.Builder(this);
bulider.setTitle( "简单列表对话框" ); //
设置标题
bulider.setIcon(R.drawable. ic_launcher); //
设置标题左边的图片
bulider.setItems(items, new OnClickListener()
{

@Override
public void onClick(DialogInterface
dialog, int which) {
// TODO Auto-generated
method stub
Toast. makeText(getApplicationContext(), items[which],
Toast. LENGTH_SHORT).show();
}
});
setPositiveButton(bulider);
setNegativeButton(bulider);
bulider.show();
}
//
单选列表对话框
public void singleSelect(View
v) {
AlertDialog.Builder bulider = new AlertDialog.Builder(this);
bulider.setTitle( "单选列表对话框" ); //
设置标题
bulider.setIcon(R.drawable. ic_launcher); //
设置标题左边的图片
bulider.setSingleChoiceItems( items,
1, new OnClickListener() {

@Override
public void onClick(DialogInterface
dialog, int which) {
Toast. makeText(getApplicationContext(), items[which],
Toast. LENGTH_SHORT).show();

}
});
setPositiveButton(bulider);
setNegativeButton(bulider);
bulider.show();
}
//多选列表对话框
public void mulSelect(View
v){
AlertDialog.Builder bulider = new AlertDialog.Builder(this);
bulider.setTitle( "单选列表对话框" ); //
设置标题
bulider.setIcon(R.drawable. ic_launcher); //
设置标题左边的图片
bulider.setMultiChoiceItems( items, new boolean[]{false}, null);
setPositiveButton(bulider);
setNegativeButton(bulider);
bulider.show();

}
// 设置确定按钮
public AlertDialog.Builder setPositiveButton(AlertDialog.Builder
bulider) {
return bulider.setPositiveButton("确定" , new OnClickListener()
{

@Override
public void onClick(DialogInterface
dialog, int which) {
// TODO Auto-generated
method stub
Toast. makeText(getApplicationContext(), "确定",
Toast. LENGTH_SHORT).show();
}
});
}
// 设置取消按钮
public AlertDialog.Builder setNegativeButton(AlertDialog.Builder
bulider) {
return bulider.setNegativeButton("取消" , new OnClickListener()
{

@Override
public void onClick(DialogInterface
dialog, int which) {
// TODO Auto-generated
method stub
Toast. makeText(getApplicationContext(), "取消",
Toast. LENGTH_SHORT).show();
}
});
}
DatePickerDialog、TimePickerDialog使用：

只要通过new 关键字创建DatePickerDialog、TimePickerDialog的实例，调用他们的show()方法即可

DatePickerDialog的监听器：new DatePickerDialog.OnDateSetListener(){};
TimePickerDialog的监听器：newTimePickerDialog.OnTimeSetListener(){};



那么如何将Activity悬浮在另外一个Activity上面？ 答案很简单：
只要把显示的activity设定为窗口即可
在AndroidMainFest.xml文件中配置：
在<activity 里面 android:theme="@android:style/Theme.Dialog"/>