重新设置样式
dependencies {
    // ...
    implementation 'com.google.android.material:material:1.0.0'
}
MaterialDatePicker代替DatePickerDialog,并设置MaterialDatePicker.Builder实例的样式:MaterialDatePicker.Builder builder = MaterialDatePicker.Builder.dateRangePicker();
builder.setTheme(R.style.ThemeOverlay_MaterialComponents_MaterialCalendar); // 设置样式
MaterialDatePicker picker = builder.build();
picker.show(getSupportFragmentManager(), picker.toString());