widget(7、dialog)

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(R.drawable.ic_launcher); //设置图标
builder.setTitle("错误提示");  //设置标题栏
builder.setMessage("数据库读取错误"); //对话框内容
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  //确认按键的事件触发        
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast t = Toast.makeText(getApplicationContext(), "确定", Toast.LENGTH_LONG);
        t.show();
    }
});
                
builder.setNegativeButton("取消", new DialogInterface.OnClickListener(){  //取消按键的事件触发

    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast t = Toast.makeText(getApplicationContext(), "取消", Toast.LENGTH_LONG);
         t.show();
        }            
    });
                
    builder.create().show();            

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="21dp"
        android:ems="10" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="15dp"
        android:ems="10"
        android:inputType="textPersonName" />

</RelativeLayout>

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);  
final View view = inflater.inflate(R.layout.dialog_input, null);   
builder.setIcon(R.drawable.ic_launcher);  
builder.setTitle("输入框");  
builder.setView(view);