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 AlertDialog(对话框)是其他 Dialog的的父类！比如ProgressDialog，TimePickerDialog等，而AlertDialog的父类是：Dialog！

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(toolbar);        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });    }//弹出普通对话框    public  void dialogOne(){        AlertDialog.Builder bu=new  AlertDialog.Builder(this);//注意这里不能用getApplicationContext()，对话框只能用this，this代表当前的activity；bu.setTitle("警告");bu.setMessage("确定给取消");bu.setPositiveButton("确定", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface dialog, int which) {    }});bu.setNegativeButton("取消", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface dialog, int which) {    }});bu.show();    }    //单选对话框    public  void dialogtwo(){        AlertDialog.Builder bu=new  AlertDialog.Builder(this);//注意这里不能用getApplicationContext()，对话框只能用this，this代表当前的activity；        bu.setTitle("选择课程");       final  String[] items={"c","c++","c#"};       //-1代表没有选中，0代表第一个       bu.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {           @Override           public void onClick(DialogInterface dialog, int which) {               String  str=items[which];//取对应的数据               dialog.dismiss();//消失对话框           }       });        bu.show();    }    //多选对话框    public  void dialogthree(){        AlertDialog.Builder bu=new  AlertDialog.Builder(this);//注意这里不能用getApplicationContext()，对话框只能用this，this代表当前的activity；        bu.setTitle("选择课程");        final  String[] items={"c","c++","c#"};        final boolean[] boos={true,true,true};//对应上面的items       bu.setMultiChoiceItems(items, boos, new DialogInterface.OnMultiChoiceClickListener() {           @Override           public void onClick(DialogInterface dialog, int which, boolean isChecked) {           }       });       //添加一个确定按钮        bu.setPositiveButton("确定", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {//吧选中的数据取出来                for(int i=0;i

===========给对话框设置自定义view============

AlertDialog.Builder builder=new AlertDialog.Builder(this);AlertDialog dialog=builder.create();View contentview=View.inflate(this,R.layout.dialog_enterblackname,null);dialog.setView(contentview,0,0,0,0);dialog.show();

日期选择对话框

@Override    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        Calendar cale1 = Calendar.getInstance();        new DatePickerDialog(getActivity(),new DatePickerDialog.OnDateSetListener() {            @Override            public void onDateSet(DatePicker view, int year, int monthOfYear,                                  int dayOfMonth) {                //这里获取到的月份需要加上1哦~             String result = "";     result += "你选择的是"+year+"年"+(monthOfYear+1)+"月"+dayOfMonth+"日";                Toast.makeText(getActivity().getApplicationContext(), result, Toast.LENGTH_SHORT).show();            }        }                ,cale1.get(Calendar.YEAR)                ,cale1.get(Calendar.MONTH)                ,cale1.get(Calendar.DAY_OF_MONTH)).show();    }

时间选择对话框

@Overridepublic void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {    super.onViewCreated(view, savedInstanceState);    Calendar cale2 = Calendar.getInstance();    new TimePickerDialog(getActivity(), new TimePickerDialog.OnTimeSetListener() {        @Override        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {         String   result = "";            result += "您选择的时间是:"+hourOfDay+"时"+minute+"分";            Toast.makeText(getActivity().getApplicationContext(), result, Toast.LENGTH_SHORT).show();        }    }, cale2.get(Calendar.HOUR_OF_DAY), cale2.get(Calendar.MINUTE), true).show();}

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