public void showAlertDialog(View view){

    AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);

    dialog.setTitle("这是一个AlertDialog");

    dialog.setMessage("对话框详细信息:请选择“取消”还是“确认”？");

    dialog.setCancelable(false);//不能取消

    dialog.setPositiveButton("确认",new DialogInterface.OnClickListener(){

        @Override

        public void onClick(DialogInterface dialog,int which){

            TextView tv1 = (TextView)findViewById(R.id.textView);

            tv1.setText("你选择了确认！");

        }

    });

    dialog.setNegativeButton("取消", new DialogInterface.OnClickListener(){

        @Override

        public void onClick(DialogInterface dialog, int which){

        　　TextView tv1 = (TextView)findViewById(R.id.textView);

    　　}

    });

    dialog.show();

}

public void showProgressDialog(View view){

    ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);

    progressDialog.setTitle("这是一个进度条对话框");

    progressDialog.setMessage("请耐心等待,正在处理数据...");

    progressDialog.setCancelable(true);

    progressDialog.show();
}

public void showDateDialog(View view){

    DatePickerDialog.OnDateSetListeneronDateSetListener= new DatePickerDialog.OnDateSetListener(){

        @Override

        public void onDateSet(DatePicker view, int year, int month, int dayOfMonth){

            TextView tv1 = (TextView)findViewById(R.id.textView);

            String theDate = String.format("你选择的日期：%d年%月%日", year, month, dayOfMonth);

            tv1.setText(theDate);

        }

    };

    DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this, onDateSetListener, 2017, 5, 1);

    dataPickerDialog.show();

}    

public void showTimeDialog(View view){

    TimePickerDialog.OnTimeSetListeneronTimeSetListener = newTimePickerDialog.OnTimeSetListener(){

        @Override

        public void onTimeSet(TimePicker view, int hourOfDay, int minute){

            TextView tv1 = (TextView)findViewById(R.id.textView);

            String theTime = String.format("你选择的时间:%d:%d",hourOfDay, minute);

            tv1.setText(theTime);

        }

    };

    TimePickerDialog timePickerDialog = new TimePickerDialog(MainActivity.this, onTimeSetListener, 0,0,true);

    timePickerDialog.show();

}