Dialog对话框
这个内容比较简单，所以就没用很多的文字解释，直接看代码
这是我们要讲的展示的所有东西：
首先我们来展示一些吐丝：有上诉4种：（这里的代码省略了基本的内容，只显示具体功能的代码）
//吐丝 bt1.setOnClickListener(new OnClickListener() { public void onClick(View v) { Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT); toast.show(); } }); 
//居中吐丝 bt2.setOnClickListener(new OnClickListener() { public void onClick(View v) { Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT); /** * toast.setGravity(int gravity, int xOffset, int yOffset) * gravity:初始位置 * xOffset X轴的偏移量，+向右，-向左 * yOffset Y轴的偏移量，+向下，-向上 */ toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } }); 
//图片吐丝 bt3.setOnClickListener(new OnClickListener() { public void onClick(View v) { Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT); LinearLayout toast_layout = (LinearLayout)toast.getView();//得到toast的view（里面有吐丝两个字） ImageView iv = new ImageView(MainActivity.this); iv.setImageResource(R.drawable.ic_launcher); toast_layout.addView(iv);//往toast的view里面添加一个图片，因为toast是linerLayout类型，所以加在了下面 toast.show(); } });
//自定义吐丝 bt4.setOnClickListener(new OnClickListener() { public void onClick(View v) { Toast toast = new Toast(MainActivity.this); //将布局变成view对象 LayoutInflater inflater = LayoutInflater.from(MainActivity.this); View view = inflater.inflate(R.layout.diy, null); toast.setView(view);//调用toast的setView方法就能将view替换toast的样子 toast.show(); } }); 
接下来我们来展示一些对话框：
总的来说对话框是构建一个AlertDialog.Builder对象
这个对象是用来创建对话框的，通过把标题，图片，样式都传入给AlertDialog.Builder对象，
然后通过AlertDialog.Builder对象的create()方法返回一个AlertDialog对象，最后展示在页面上
AlertDialog.Builder对象的具体方法：
Bt1.setOnClickListener(new OnClickListener() { public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("确认对话框"); builder.setIcon(R.drawable.ic_launcher); builder.setMessage("对话框显示的内容"); builder.setPositiveButton("取消", new android.content.DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Toast toast = Toast.makeText(MainActivity.this, "取消被点拉", Toast.LENGTH_SHORT); toast.show(); } }); builder.setNegativeButton("确认", new android.content.DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Toast toast = Toast.makeText(MainActivity.this, "确认被点拉", Toast.LENGTH_SHORT); toast.show(); } }); AlertDialog dialog = builder.create(); dialog.show(); } }); 
Bt2.setOnClickListener(new OnClickListener() { public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("单选对话框"); builder.setIcon(R.drawable.ic_launcher); /** * builder.setSingleChoiceItems(String[] items, int checkedItem, listener); * items:单选框的选项 这一参数除了可以是字符串，还可以是游标，适配器内的东西 * chekedItem:默认被选中的选项 */ builder.setSingleChoiceItems(s, 0, new DialogInterface.OnClickListener() { //int which:被选中的 public void onClick(DialogInterface dialog, int which) { Toast toast = Toast.makeText(MainActivity.this, s[which]+"被选拉", Toast.LENGTH_SHORT); toast.show(); } }); AlertDialog dialog = builder.create(); dialog.show(); } }); 
Bt3.setOnClickListener(new OnClickListener() { public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("多选对话框"); builder.setIcon(R.drawable.ic_launcher); /** * builder.setMultiChoiceItems(String items, boolean[] checkedItems, listener) * items:多选框的选项 这一参数除了可以是字符串，还可以是游标，适配器内的东西 * chekedItem:是否被选中 */ builder.setMultiChoiceItems(s2, null, new OnMultiChoiceClickListener() { //int which:被选中的 isChecked:true（没选的被选了）false（选了又取消了） public void onClick(DialogInterface dialog, int which, boolean isChecked) { if(isChecked){ Toast toast = Toast.makeText(MainActivity.this, s2[which]+"被选拉", Toast.LENGTH_SHORT); toast.show(); }else{ Toast toast = Toast.makeText(MainActivity.this, s2[which]+"没被选拉", Toast.LENGTH_SHORT); toast.show(); } } }); AlertDialog dialog = builder.create(); dialog.show();; } }); 
Bt4.setOnClickListener(new OnClickListener() { public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("列表对话框"); builder.setIcon(R.drawable.ic_launcher); builder.setItems(s2, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Toast toast = Toast.makeText(MainActivity.this, s2[which]+"被点拉", Toast.LENGTH_SHORT); toast.show(); } }); AlertDialog dialog = builder.create(); dialog.show(); } }); 
Bt5.setOnClickListener(new OnClickListener() { public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("自定义对话框"); builder.setIcon(R.drawable.ic_launcher); LayoutInflater inflater = LayoutInflater.from(MainActivity.this); View view = inflater.inflate(R.layout.diy, null); builder.setView(view); AlertDialog dialog = builder.create(); dialog.show(); bt = (Button)view.findViewById(R.id.bb); bt.setOnClickListener(new OnClickListener() { public void onClick(View v) { Toast toast = Toast.makeText(MainActivity.this, "被发送了", Toast.LENGTH_SHORT); toast.show(); } }); } }); 
如果有什么错误，或者我理解错误或不当的，恳请大家纠正，谢谢！嘻嘻嘻~~~