在Activity中可以调用showDialog()来显示一个对话框，覆盖Activity的onCreateDialog方法，在这个方法中创建对话框，返回一个Dialog对象。

1.最简单的对话框

AlertDialog.Builder b=new  AlertDialog.Builder(this);b.setTitle("简单的");			b.setMessage("this is a simple dialog");			b.setPositiveButton("是", new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub									}			});			b.setNegativeButton("否", new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub									}			});			return b.create();

效果如下

2.列表对话框

 

b.setTitle("列表");			//b.setMessage("message");这行代码不要有			b.setItems(items, new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub					Toast.makeText(AndroidDialogActivity.this, items[which], Toast.LENGTH_SHORT).show();									}			});			return b.create();

items是一个String数组

效果图

3.单选对话框

b.setTitle("请选择颜色");			b.setSingleChoiceItems(items, -1,  new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub					Toast.makeText(AndroidDialogActivity.this, items[which], Toast.LENGTH_SHORT).show();									}			});			b.setPositiveButton("是", new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub									}			});			b.setNegativeButton("否", new DialogInterface.OnClickListener() {								@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub									}			});			return b.create();

效果图

4.多选对话框

 

 

boolean []ddd=new boolean[3];			b.setTitle("请选择颜色");			b.setMultiChoiceItems(items, ddd, new DialogInterface.OnMultiChoiceClickListener(){				@Override				public void onClick(DialogInterface dialog, int which,						boolean isChecked) {					// TODO Auto-generated method stub									}							});						return b.create();

效果图

5.进度条对话框

Handler hand=new Handler(){		@Override		public void handleMessage(Message msg) {			// TODO Auto-generated method stub			super.handleMessage(msg);			if(progressint>=100)			{				pd.dismiss();			}			else			{				progressint++;				pd.setProgress(progressint);				hand.sendEmptyMessageDelayed(0, 100);			}					}			};pd=new ProgressDialog(this);			pd.setTitle("进度对话框");			pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);			pd.setMax(100);			AndroidDialogActivity.this.hand.sendEmptyMessage(0);			pd.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener(){				@Override				public void onClick(DialogInterface dialog, int which) {					// TODO Auto-generated method stub														}});			return pd;

效果图

6.代码自定义对话框

EditText et=new EditText(this);			et.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD|InputType.TYPE_CLASS_TEXT);			b.setTitle("请输入密码");			b.setView(et);			return b.create();

效果图

7.XML文件自定义对话框

xml文件

Java代码

 

b.setIcon(R.drawable.ic_launcher);			b.setTitle("自定义对话框");			LayoutInflater li=LayoutInflater.from(this);			View v=li.inflate(R.layout.info, null);			Button yes=(Button) v.findViewById(R.id.buttonyes);			yes.setOnClickListener(new OnClickListener(){				@Override				public void onClick(View v) {					// TODO Auto-generated method stub					Toast.makeText(AndroidDialogActivity.this, "Hello World", Toast.LENGTH_SHORT).show();				}});			b.setView(v);			return b.create();

效果图